A method for producing, storing, transporting, using and mixing emulsified asphalt

Abstract

The present invention relates to the technical field of highway engineering materials, and provides a method for producing, storing, transporting, using and mixing emulsified asphalt. The production and storage method includes: S1, preheating asphalt raw materials, soap liquid, preheating and pressurizing the emulsified asphalt product storage tank; S2, self-circulating and regulating the stable flow, temperature and pressure through the raw material asphalt pipeline and the soap liquid pipeline; S3, starting the colloid mill, controlling the raw material asphalt pipeline and the soap liquid pipeline to be connected to the inlet side of the colloid mill respectively; S4, the asphalt raw materials and soap liquid are sent to the colloid mill, and the colloid mill is used to mix and emulsify the asphalt raw materials and the soap liquid to obtain a high-solid content oil-in-water emulsified asphalt, which is sent to the emulsified asphalt product storage tank through the emulsified asphalt pipeline for heat preservation and pressure storage. Through the scheme of the present invention, the emulsified asphalt can be mixed with various graded aggregates when used, and at the same time has the three characteristics of high-temperature fluidity of asphalt, fluidity of emulsified asphalt and low viscosity of foamed asphalt, which ensures the construction and workability of the mixing, paving and compacting processes.

Description

Technical Field

[0001] The invention relates to the technical field of highway engineering materials, and in particular to a method for producing, storing, transporting, using and mixing emulsified asphalt. Background Art

[0002] Conventional emulsified asphalt is generally made by emulsifying road petroleum asphalt, emulsifier and water through mechanical shearing and chemical stabilization to obtain an oil-in-water emulsion. Conventional oil-in-water emulsion needs to be cooled to below 80°C by a cooler for storage, transportation and use. The solid content is generally ≤65%, and there are the following technical defects:

[0003] (1) The amount of emulsifier used is large. The amount of slow-cracking and fast-setting emulsifier generally accounts for more than 3% of the emulsified asphalt, and the amount of fast-cracking emulsifier generally accounts for more than 1% of the emulsified asphalt. When mixed with aggregates, a large amount of emulsifier residue is likely to affect the water resistance of the asphalt mixture.

[0004] (2) Conventional emulsified asphalt has a low solid content and a high water content, which results in a longer curing time for the asphalt mixture and affects the construction progress.

[0005] (3) When conventional emulsified asphalt is mixed with aggregate at room temperature, 3%-8% of water is usually added to ensure construction and workability. This makes the comprehensive moisture content of the asphalt mixture usually reach 4%-11%. Water evaporates at room temperature, resulting in a long curing time and slow strength formation of the paved mixture.

[0006] (4) When conventional emulsified asphalt is used in the hot mix process, the vaporization and volatilization of water can easily cause the temperature of the asphalt mixture to drop suddenly, affecting paving and compaction. The aggregate needs to be heated to a high temperature of 160°C or above to ensure the quality of the asphalt mixture, which consumes a lot of energy. When hot base asphalt is conventionally used in the hot mix process, the asphalt needs to be heated to a high temperature of 150°C or above. When hot modified asphalt is used, the asphalt needs to be heated to a high temperature of 175°C or above. At the same time, the aggregate needs to be heated to a corresponding high temperature. This not only consumes a lot of energy, but also the asphalt is easily aged by heat at high temperatures and emits toxic gases. Summary of the invention

[0007] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0008] To this end, an object of the present invention is to provide an emulsified asphalt production, storage, transportation, use and mixing method. The emulsified asphalt is produced, stored and transported under high pressure and high temperature, and used under normal pressure and high temperature. When used, the emulsified asphalt can be mixed with various graded aggregates, and has the three characteristics of high temperature fluidity of asphalt, fluidity of emulsified asphalt and low viscosity of foamed asphalt, which ensures the construction and workability of the mixing, paving and compacting processes. The asphalt mixture obtained by mixing has low moisture content and low emulsifier content, and can be mixed, spread and compacted for a long time, with a short curing time and a fast early strength improvement.

[0009] In order to achieve the above-mentioned purpose, the technical scheme of the present invention provides a method for producing and storing emulsified asphalt, comprising the following steps: asphalt raw material and soap liquid are pumped to a colloid mill for mixing and emulsification according to a designed ratio to obtain a high-solid content oil-in-water emulsified asphalt, which is directly transported to an emulsified asphalt product storage tank for heat-insulated and pressure-maintained storage, wherein the pressure of the asphalt raw material is controlled at 0.5-1.0 MPa, and the temperature is controlled at 150-180°C; the pressure of the soap liquid is controlled at 0.5-1.0 MPa, and the temperature is controlled at 65-80°C; the soap liquid is prepared by emulsifier and water, and the emulsifier accounts for 0.5-5% of the soap liquid; the flow ratio of the asphalt raw material to the soap liquid is (3-19):1; the temperature of the emulsified asphalt product storage tank is controlled at 130-180°C, and the pressure is controlled at 0.30-0.80 MPa; the outlet pressure of the colloid mill is controlled at 0.5-1.0 MPa, the outlet temperature is controlled at 130-180°C, and the rotation speed is controlled at 1450-2900r / min.

[0010] Preferably, the method for producing and storing emulsified asphalt comprises the following steps:

[0011] S1, preheat the raw asphalt to 150-180℃, preheat the soap solution to 65-80℃, preheat the emulsified asphalt product storage tank and keep the temperature at 130-180℃, increase the pressure and maintain it at 0.30-0.80MPa;

[0012] S2, regulating and stabilizing the flow rate, temperature and pressure of the raw asphalt raw material through the self-circulation of the raw asphalt pipeline, and regulating and stabilizing the flow rate, temperature and pressure of the soap liquid through the self-circulation of the soap liquid pipeline, wherein the outlet pressure of the asphalt pump in the raw asphalt pipeline is controlled at 0.5-1.0MPa, the temperature is 150-180°C, and the outlet pressure of the soap liquid pump in the soap liquid pipeline is controlled at 0.5-1.0MPa, the temperature is 65-80°C;

[0013] S3, open the inlet valve of the emulsified asphalt product storage tank, start the colloid mill, and control the raw asphalt pipeline and the soap liquid pipeline to be connected to the inlet side of the colloid mill respectively;

[0014] S4, the asphalt raw material is sent from the raw asphalt storage tank to the colloid mill via the raw asphalt pipeline, and the soap liquid is sent from the soap liquid tank to the colloid mill via the soap liquid pipeline. The asphalt raw material and the soap liquid are mixed and emulsified by the colloid mill to obtain high-temperature and high-solid content oil-in-water emulsified asphalt, which is sent to the emulsified asphalt product storage tank via the emulsified asphalt pipeline for heat-insulated and pressure-maintained storage.

[0015] The emulsified asphalt production and storage method can be realized by an emulsified asphalt production and storage device, which includes: a raw asphalt storage tank, a soap liquid tank, a colloid mill, and an emulsified asphalt product storage tank that are arranged in coordination; the raw asphalt storage tank is connected to the inlet of the colloid mill through a raw asphalt pipeline, and an asphalt pump, an asphalt flowmeter, an asphalt back pressure device, and an asphalt three-way valve are arranged on the raw asphalt pipeline in sequence, and the asphalt three-way valve is respectively connected to the inlet of the colloid mill, the asphalt back pressure device, and the inlet of the asphalt pump through pipelines; the soap liquid tank is connected to the inlet of the colloid mill through a soap liquid The soap liquid pipeline is connected, and a soap liquid pump, a three-way shunt regulating valve, a soap liquid flowmeter, a soap liquid back pressure device, and a soap liquid three-way valve are sequentially arranged on the soap liquid pipeline. The soap liquid three-way valve is respectively connected to the inlet of the colloid mill, the soap liquid back pressure device and the inlet of the soap liquid pump through pipelines, and the three-way shunt regulating valve is also connected to the pipeline between the soap liquid three-way valve and the inlet of the soap liquid pump; the emulsified asphalt product storage tank is connected to the outlet of the colloid mill through the emulsified asphalt pipeline, and the emulsified asphalt product storage tank is provided with a heating and heat preservation device, a compressed air supply and a pressure control device.

[0016] Preferably, when the asphalt raw material is base asphalt, in step S1, the asphalt raw material is preheated to 150-170°C, the soap solution is preheated to 65-70°C, and the emulsified asphalt product storage tank is kept at a constant temperature of 130-160°C and a constant pressure of 0.30-0.60MPa; in step S2, the outlet temperature of the asphalt pump is controlled at 150-170°C, and the outlet temperature of the soap solution pipeline is controlled at 65-70°C.

[0017] Preferably, when the asphalt raw material is modified asphalt, in step S1, the asphalt raw material is preheated to 170-180°C, the soap solution is preheated to 70-80°C, and the emulsified asphalt product storage tank is kept at a constant temperature of 150-180°C and a constant pressure of 0.50-0.80MPa; in step S2, the outlet temperature of the asphalt pump is controlled at 150-180°C, and the outlet temperature of the soap solution pipeline is controlled at 70-80°C.

[0018] Preferably, the modified asphalt comprises the following components in parts by weight: 80-90 parts of base asphalt, 5-10 parts of SBS, 3-8 parts of SBR, and 1-4 parts of SEBS.

[0019] The technical solution of the present invention also provides an emulsified asphalt, which is obtained by the emulsified asphalt production and storage method of any one of the above technical solutions. The emulsified asphalt is of oil-in-water type, has a solid content of 75%-95%, a storage temperature of 130-180°C, and a storage pressure of 0.3-0.8MPa, which is the pressure at which water does not vaporize at the corresponding storage temperature.

[0020] The technical solution of the present invention also provides a method for transporting emulsified asphalt. The high-solid content oil-in-water emulsified asphalt in the emulsified asphalt product storage tank is directly sent to the mixing equipment or the transfer tank via the emulsified asphalt oil delivery pipeline. The delivery pressure of the emulsified asphalt oil delivery pipeline is controlled at 0.30-0.80MPa, and the transportation conditions are controlled at a temperature of 130-180°C and a pressure of 0.30-0.80MPa.

[0021] Preferably, when the emulsified asphalt in the emulsified asphalt product storage tank is obtained from base asphalt, the delivery pressure of the emulsified asphalt oil pipeline is controlled at 0.30-0.60 MPa; the transportation conditions are controlled at a temperature of 130-160° C. and a pressure of 0.30-0.60 MPa.

[0022] Preferably, when the emulsified asphalt in the emulsified asphalt product storage tank is obtained from modified asphalt, the delivery pressure of the emulsified asphalt oil pipeline is controlled at 0.50-0.80 MPa; the transportation conditions are controlled at a temperature of 150-180°C and a pressure of 0.50-0.80 MPa.

[0023] The technical solution of the present invention also provides a method for using emulsified asphalt. The high-temperature and high-solid content emulsified asphalt in the emulsified asphalt product storage tank or the transfer tank is directly sent to the mixing equipment through the emulsified asphalt oil pipeline, and mixed with various graded aggregates. The delivery pressure of the emulsified asphalt oil pipeline is controlled at 0.30-0.80MPa.

[0024] The technical solution of the present invention also provides a method for mixing emulsified asphalt with room temperature aggregate, comprising the following steps: according to the aggregate conditions, according to a first preset formula, determining the solid content and initial temperature of the emulsified asphalt, the first preset formula comprising:

[0025] Wherein, L represents the mixing time, h; Characterized as the specific heat capacity of pure asphalt, kJ / kg•℃; Characterized as the mass of pure asphalt in emulsified asphalt, kg; Characterized as the mass of water, kg; Characterized by the latent heat of vaporization of water at one atmosphere (0.1 MPa) and 100°C, 2257.2 kJ / kg; Characterized by the specific heat capacity of water, kJ / kg•℃; It is represented by the surface heat transfer coefficient of asphalt and aggregate mixing, W / ㎡•℃; A is represented by the heat exchange area, that is, the total surface area of ​​aggregate, ㎡; Characterized by the initial temperature of the emulsified asphalt, °C; Characterized by the temperature of emulsified asphalt after mixing, °C; Characterized as the initial temperature of the aggregate, °C; Characterized by the temperature of aggregate after mixing, °C; Characterized as the mass of aggregate, kg; Characterized by the emulsion-to-aggregate ratio, %, the mass ratio of emulsified asphalt to aggregate; Characterized by emulsified asphalt solid content, %;

[0026] According to the solid content and initial temperature of the emulsified asphalt, the flow rate, temperature, pressure of the asphalt raw material and the flow rate, temperature and pressure of the soap solution in the emulsified asphalt production and storage method are adjusted. At the same time, the temperature and pressure of the emulsified asphalt product storage tank and the transportation conditions are controlled so that the emulsified asphalt that meets the solid content and initial temperature conditions can be added to the mixing bin for mixing.

[0027] Preferably, the method for mixing emulsified asphalt with room temperature aggregate also includes: pre-storing a data table of the correspondence between the solid content of the emulsified asphalt and the initial temperature, and a data table of the correspondence with the condition control in the emulsified asphalt production and storage method; traversing the emulsified asphalt solid content from large to small until the emulsified asphalt solid content and initial temperature that satisfy the first preset formula are confirmed.

[0028] The data table of the correspondence between the solid content of emulsified asphalt and the initial temperature, as well as the data table of the correspondence between the solid content of emulsified asphalt and the condition control in the production and storage method of emulsified asphalt are both pre-stored based on actual production. The condition control in the production and storage method of emulsified asphalt includes the flow rate, temperature, and pressure of the asphalt raw material and the flow rate, temperature, and pressure of the soap solution, the specific substances and proportions of the asphalt raw material, the specific substances and proportions of the soap solution, the temperature and pressure of the emulsified asphalt product storage tank, and the transportation conditions, etc.

[0029] Preferably, the aggregate includes old road pavement materials. During mixing, emulsified asphalt, room temperature regeneration reinforcing agent and performance promoter are added to the aggregate, wherein the mass ratio of emulsified asphalt to aggregate is 2%-6%, the mass ratio of room temperature regeneration reinforcing agent to aggregate is 0.3%-1.5%, and the mass ratio of performance promoter to aggregate is 1%-6%.

[0030] When using old road pavement materials, new stones can be added according to the actual construction situation and the requirements of the specifications and design documents. The particle size, gradation and addition amount of the new stones are selected according to the actual construction situation. When using old road pavement materials, the use of high-solid content oil-in-water emulsified asphalt obtained from modified asphalt can better ensure the quality of the recycled asphalt mixture.

[0031] The technical solution of the present invention also provides a room temperature asphalt mixture, which is obtained by mixing the emulsified asphalt and room temperature aggregate according to any one of the above technical solutions.

[0032] The technical solution of the present invention also provides a method for hot mixing emulsified asphalt and old road pavement materials, comprising the following steps: determining the heating temperature of the total aggregate according to the conditions of the emulsified asphalt and the total aggregate according to a second preset formula, wherein the second preset formula includes:

[0033] in, Characterized by the heating temperature of the total aggregate, °C; Characterized as the mass of the total aggregate to be heated, kg; Characterized by the mass of old asphalt in the old road pavement material, kg; It is represented by the mass of old aggregate in the old road pavement material or the sum of the mass of old aggregate and newly added stone, kg; Characterized as the mass of emulsified asphalt, kg; Characterized by the emulsion-to-stone ratio, %, the mass ratio of emulsified asphalt to total aggregate; Characterized by emulsified asphalt solid content, %; Characterized by the latent heat of vaporization of water at one atmosphere (0.1 MPa) and 100°C, 2257.2 kJ / kg; Characterized as the specific heat capacity of pure asphalt, kJ / kg•℃; Characterized by the initial temperature of the emulsified asphalt, °C; Characterized as the specific heat capacity of the aggregate, kJ / kg•℃; Characterized by the discharge temperature after mixing, °C;

[0034] After heating the aggregate according to the determined heating temperature, mix it evenly with emulsified asphalt and regeneration agent.

[0035] Preferably, the total aggregate includes only old road pavement materials or includes old road pavement materials and newly added stones, and the newly added stones are one or more of limestone, basalt, and diorite; the mass ratio of emulsified asphalt to total aggregate is 1.5%-6%, and the mass ratio of regeneration agent to total aggregate is 0.3%-1.5%.

[0036] The technical solution of the present invention also provides a hot asphalt mixture, which is obtained by the hot mixing method of the emulsified asphalt and old highway pavement material in any of the above technical solutions.

[0037] The emulsified asphalt production and storage method, transportation method, use method and mixing method proposed by the present invention have the following beneficial technical effects:

[0038] (1) The emulsified asphalt obtained by the emulsified asphalt production and storage method proposed by the present invention is produced, stored and transported under high pressure and high temperature. Through the unique process parameter control in the emulsified asphalt production and storage method, the emulsified asphalt presents an oil-in-water type, with a solid content of 75%-95% and a temperature of 130-180°C. It is applied under normal pressure and high temperature, and has three mixing, paving, construction and workability functions: high-temperature fluidity of asphalt, fluidity of emulsified asphalt, and low viscosity of foamed asphalt. The emulsified asphalt of the present invention has high stability. When left to stand for 10 days under the corresponding storage conditions, the deviation rate of the solid content detected in the laboratory does not exceed 0.5%. The emulsified asphalt of the present invention has good fluidity and good construction and workability. After mixing with aggregates, the water content is low and the emulsifier content is low. The obtained asphalt mixture has good water resistance, a reasonable and controllable mixing and paving time, a short curing time, and a fast early strength improvement.

[0039] (2) The method for producing and storing emulsified asphalt proposed in the present invention has low dependence on the type of emulsifier, and one or more of fast-cracking, slow-cracking, and medium-cracking emulsifiers can be selected. The amount of emulsifier used is relatively low, and can be as low as 0.025% of the mass of the emulsified asphalt. Compared with conventional low-solid emulsified asphalt, taking the mass percentage of the slow-cracking and fast-setting emulsifier in the emulsified asphalt as 3% as an example, the amount of emulsifier used in the emulsified asphalt of the present invention is reduced by more than 58%, which significantly reduces the material cost.

[0040] (3) The emulsified asphalt is obtained by adopting the emulsified asphalt production, storage and transportation method proposed in the present invention. When mixed with aggregate, the emulsified asphalt exhibits the composite construction and workability technical characteristics of hot asphalt, emulsified asphalt and foamed asphalt. The soap solution is both an emulsifier and a foaming agent. The emulsified asphalt is used under normal pressure and high temperature. On the one hand, its good fluidity is ensured. On the other hand, the vaporization of water forms a large number of fine bubbles. The asphalt wrapped in water expands with the bubbles, which significantly increases the specific surface area of ​​the asphalt, making the asphalt more evenly coated on the aggregate. The asphalt wrapped in water expands with the bubbles, which reduces the intermolecular force and viscosity, which is conducive to uniform mixing, improves mixing efficiency, and ensures a long construction and workability during the mixing, paving and compacting processes.

[0041] (4) The emulsified asphalt is obtained by adopting the emulsified asphalt production, storage and transportation method proposed in the present invention. When it is mixed with room temperature aggregate, no external water is required. Taking MS-3 type micro-surfacing as an example, the comprehensive moisture content of the asphalt mixture after mixing does not exceed 2.5%, and can be as low as 0.3%. Moreover, the initial temperature of the emulsified asphalt is ≥130°C, and the water is in a high temperature state, which is very conducive to the volatilization of water, which is conducive to improving the early strength and greatly shortening the curing time. Compared with the use of conventional emulsified asphalt, the curing time can be shortened by more than 60%.

[0042] (5) When the emulsified asphalt is obtained by the production, storage and transportation method of the emulsified asphalt proposed in the present invention and hot-mixed with aggregate, the volatilization of water will not reduce the heat of the asphalt mixture, and there is no need to balance the cooling effect by increasing the temperature of the heated aggregate, which is more energy-saving.

[0043] (6) The emulsified asphalt obtained by the production, storage and transportation method of emulsified asphalt proposed in the present invention can be used under normal pressure and high temperature conditions and mixed with room temperature aggregates. The room temperature asphalt mixture after mixing has the advantages of low emulsifier content, low water content, fast demulsification speed, short curing time, and fast early strength improvement. The performance indicators can meet the requirements of the specifications.

[0044] (7) The emulsified asphalt obtained by the production, storage and transportation method of emulsified asphalt proposed in the present invention can be used at normal pressure and high temperature and hot mixed with old road pavement materials. The hot asphalt mixture after mixing has the advantages of low emulsifier content, low water content, no need to increase the heating temperature of the old materials, etc. The performance indicators can meet the requirements of the specifications and the energy consumption is low.

[0045] (8) In the method for mixing emulsified asphalt with aggregate at room temperature obtained by using the method for producing, storing and transporting emulsified asphalt proposed in the present invention, firstly, according to the aggregate conditions and the formula model, the solid content and initial temperature of the emulsified asphalt are determined. The solid content here is a higher solid content that meets the conditions. Then, the condition control in the production and storage method is adjusted so that the emulsified asphalt is directly mixed with the aggregate at room temperature and meets the mixing, paving and compaction time requirements. The construction environment temperature applicable to the normal temperature asphalt mixture obtained by the method for mixing emulsified asphalt with normal temperature aggregate can be reduced to 5°C. Compared with the conventional emulsified normal temperature asphalt mixture, which needs to be above 15°C for the construction environment temperature, the construction environment temperature can be reduced by more than 10°C, which significantly broadens the construction environment conditions.

[0046] (9) In the hot mixing method of emulsified asphalt and old road pavement materials obtained by using the emulsified asphalt production, storage and transportation methods proposed by the present invention, the aggregate heating temperature is first determined according to the formula model. On the one hand, the aggregate heating can be accurately controlled to avoid unnecessary aging, pollution and energy waste caused by overheating. On the other hand, the application of the emulsified asphalt under normal pressure and high temperature can reduce the aggregate heating temperature by more than 15°C compared with the conventional hot mixing process, which is equivalent to more than 13,000 kJ per ton of mixed material. At the same time, the vaporization shock effect of water in the high-solid content emulsified asphalt is conducive to breaking up the agglomeration of old materials. The presence of an appropriate amount of water in the emulsified asphalt is conducive to improving the uniformity of aggregate heating and the heating efficiency, so that the cooling rate of the hot asphalt mixture during transportation is slowed down, and the on-site paving and compaction time is longer.

[0047] (10) The emulsified asphalt production, storage and transportation method proposed in the present invention is produced, stored and transported under high pressure and high temperature, and used under normal pressure and high temperature, and the heat is effectively used in the mixing, paving and compacting process; the high pressure is determined according to the temperature of the emulsified asphalt, which is the pressure at which water does not vaporize, and the normal pressure is the standard atmospheric pressure. The emulsified asphalt is an oil-in-water emulsion, the asphalt is in a continuous state, and the water is in a discontinuous state. The emulsified asphalt demulsifies during the mixing process with the aggregate, and the continuous asphalt is easy to form a continuous and complete asphalt film, which is evenly coated on the surface of the aggregate, which is more conducive to ensuring construction workability and construction quality, shortening the molding time, and improving construction efficiency.

[0048] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0050] Figure 1 A schematic structural diagram of an emulsified asphalt production and storage device used in an emulsified asphalt production and storage method according to an embodiment of the present invention is shown.

[0051] in, Figure 1 The corresponding relationship between the reference numerals and the components is as follows: 102 raw asphalt storage tank, 104 soap liquid tank, 106 colloid mill, 108 emulsified asphalt product storage tank, 110 raw asphalt pipeline, 1101 asphalt pump, 1102 asphalt flow meter, 1103 asphalt back pressure device, 1104 asphalt three-way valve, 112 soap liquid pipeline, 1121 soap liquid pump, 1122 three-way diversion regulating valve, 1123 soap liquid flow meter, 1124 soap liquid back pressure device, 1125 soap liquid three-way valve, 114 emulsified asphalt pipeline, 116 emulsified asphalt oil delivery pipeline. DETAILED DESCRIPTION

[0052] The present invention discloses an emulsified asphalt production and storage method, a mixing method, and an asphalt mixture. Those skilled in the art can refer to the content of this article and appropriately improve the process parameters to achieve the above. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art, and they are all considered to be included in the present invention. The method and application of the present invention have been described through preferred embodiments, and relevant personnel can obviously modify or appropriately change and combine the method and application described herein without departing from the content, spirit and scope of the present invention to implement and apply the technology of the present invention.

[0053] The present invention will be further described below in conjunction with embodiments:

[0054] The emulsified asphalt production and storage device includes: a raw asphalt storage tank 102, a soap tank 104, a colloid mill 106, an emulsified asphalt product storage tank 108, etc. The raw asphalt storage tank 102 is connected to the inlet of the colloid mill 106 through a raw asphalt pipeline 110, and the raw asphalt pipeline 110 is sequentially provided with an asphalt pump 1101, an asphalt flowmeter 1102, an asphalt back pressure device 1103, and an asphalt three-way valve 1104. The asphalt three-way valve 1104 is respectively connected to the inlet of the colloid mill 106, the asphalt back pressure device 1103, and the inlet of the asphalt pump 1101 through pipelines. The soap liquid tank 104 is connected to the inlet of the colloid mill 106 through a soap liquid pipeline 112, on which a soap liquid pump 1121, a three-way shunt regulating valve 1122, a soap liquid flowmeter 1123, a soap liquid back pressure device 1124, and a soap liquid three-way valve 1125 are sequentially provided. The soap liquid three-way valve 1125 is respectively connected to the inlet of the colloid mill 106, the soap liquid back pressure device 1124 and the inlet of the soap liquid pump 1121 through pipelines, and the three-way shunt regulating valve 1122 is also connected to the pipeline between the soap liquid three-way valve 1125 and the inlet of the soap liquid pump 1121. The emulsified asphalt product storage tank 108 is connected to the outlet of the colloid mill 106 through the emulsified asphalt pipeline 114. The emulsified asphalt product storage tank 108 is provided with a heating and heat preservation device, a compressed air supply and a pressure control device. An agitator can be provided in the emulsified asphalt product storage tank 108, and the stirring speed is controlled at 30-200r / min, and the stability of the emulsified asphalt can be further ensured by stirring. The bottom of the emulsified asphalt product storage tank 108 is connected to the emulsified asphalt oil pipeline 116, and the emulsified asphalt oil pipeline 116 is connected to the mixing equipment or the transfer tank. There is no need to cool the emulsified asphalt finished product. At the same time, the emulsified asphalt oil pipeline 116 is used to transport it to the mixing equipment by air pressure, and there is no need to use a mechanical shearing asphalt oil pump, which overcomes the need for preheating of the asphalt oil pump and the influence of pumping on the stability of the emulsified asphalt.

[0055] Example 1

[0056] The solid content is set to 87%, and the asphalt raw material (Donghai brand 70# matrix asphalt) flow rate is 17.4 m 3 / h, the soap solution includes the following components by weight: 1 part of fast-cracking emulsifier, 1 part of hydrochloric acid with a mass concentration of 35%, and 98 parts of water; the soap solution flow rate is 2.6m 3 / h.

[0057] The emulsified asphalt production and storage method comprises the following steps:

[0058] S102, preheat the 70# base asphalt in the raw asphalt storage tank to 150°C, preheat the soap solution in the soap solution tank to 65°C, preheat the emulsified asphalt product storage tank and maintain it at 130°C, and at the same time increase the pressure and maintain it at 0.3MPa.

[0059] S104, the flow rate, temperature and pressure of the raw asphalt raw material are regulated and stabilized through the self-circulation of the raw asphalt pipeline, and the flow rate, temperature and pressure of the soap liquid are regulated and stabilized through the self-circulation of the soap liquid pipeline. The outlet pressure of the asphalt pump is 0.55Mpa, the temperature is 150℃, and the flow rate is 17.4 m 3 / h, the outlet pressure of the soap pump is 0.6MPa, the temperature is 65℃, and the flow rate is 2.6m 3 / h.

[0060] S106, open the inlet valve of the emulsified asphalt product storage tank, start the colloid mill, switch the asphalt three-way valve and the soap solution three-way valve to the inlet side of the colloid mill, the outlet pressure of the colloid mill is 0.4MPa, the temperature is 130℃, and the speed is 2900r / min.

[0061] S108, asphalt raw materials are sent to the colloid mill from the raw asphalt storage tank via an asphalt pump, an asphalt flowmeter, an asphalt back pressure device, and an asphalt three-way valve. The soap liquid is sent to the colloid mill from the soap liquid tank via a soap liquid pump, a three-way diversion regulating valve, a soap liquid flowmeter, a soap liquid back pressure device, and a soap liquid three-way valve. The colloid mill is used to mix the asphalt raw materials with the soap liquid to emulsify the asphalt to obtain a high-solid content oil-in-water emulsified asphalt, which is then sent to the emulsified asphalt product storage tank via an emulsified asphalt pipeline for heat-insulated and pressure-maintained storage.

[0062] S110, directly supplying the mixing equipment, the delivery pressure of the emulsified asphalt oil pipeline is controlled at 0.3MPa;

[0063] Alternatively, a storage tank with heating, heat preservation, pressurization and pressure maintenance functions can be selected to transport the high-solid content oil-in-water emulsified asphalt to other on-site supply mixing equipment at a temperature ≥130°C and a pressure ≥0.3MPa.

[0064] Example 2

[0065] The solid content is set to 92%, asphalt raw material (90# asphalt of CNOOC 36-1), flow rate is 18.4m³ / h. The following components of soap solution are calculated by weight: 1.5 parts of slow-cracking and fast-setting emulsifier, 1.5 parts of hydrochloric acid with a mass concentration of 35%, 97 parts of water, and the flow rate is 1.6m³ / h.

[0066] The difference from Example 1 is that in step S102, the 90# asphalt in the raw asphalt storage tank is preheated to 155°C, the soap in the soap tank is preheated to 68°C, the emulsified asphalt product storage tank is preheated and maintained at 145°C, and the pressure is increased and maintained at 0.45MPa; in step S104, the outlet pressure of the asphalt pump is 0.55MPa, the temperature is 155°C, and the flow rate is 18.4m³ / h, and the outlet pressure of the soap pump is 0.65MPa, the temperature is 68°C, and the flow rate is 2.6m³ / h. 3 / h; in step S106, the outlet pressure of the colloid mill is 0.5 MPa and the temperature is 145°C; in step S110, the delivery pressure of the emulsified asphalt oil pipeline is controlled at 0.45 MPa; the transportation conditions are controlled at temperature ≥145°C and pressure ≥0.45 MPa.

[0067] Example 3

[0068] Set the solid content to 85% and the asphalt raw material (modified asphalt) flow rate to 8.5m 3 / h, the modified asphalt includes the following components by weight: 85 parts of base asphalt, 7 parts of SBS, 5 parts of SBR, and 3 parts of SEBS. The soap solution includes the following components by weight: 1.5 parts of fast-cracking emulsifier, 1.5 parts of hydrochloric acid with a mass concentration of 35%, 97 parts of water, and a flow rate of 1.5m 3 / h.

[0069] The emulsified asphalt production and storage method comprises the following steps:

[0070] S302, preheat the modified asphalt in the raw asphalt storage tank to 175°C, preheat the soap solution in the soap solution tank to 78°C, preheat and maintain the emulsified asphalt product storage tank at 150°C, and increase the pressure and maintain it at 0.5MPa.

[0071] S304, the flow rate, temperature and pressure of the raw asphalt raw material are regulated and stabilized through the self-circulation of the raw asphalt pipeline, and the flow rate, temperature and pressure of the soap liquid are regulated and stabilized through the self-circulation of the soap liquid pipeline. The outlet pressure of the asphalt pump is 0.6Mpa, the temperature is 175℃, and the flow rate is 8.5 m 3 / h, the outlet pressure of the soap pump is 0.70MPa, the temperature is 78℃, and the flow rate is 1.5m 3 / h.

[0072] S306, open the inlet valve of the emulsified asphalt product storage tank, start the colloid mill, switch the asphalt three-way valve and the soap solution three-way valve to the inlet side of the colloid mill, the outlet pressure of the colloid mill is 0.55MPa, the temperature is 150℃, and the speed is 1450r / min.

[0073] S308, asphalt raw materials are sent to the colloid mill from the raw asphalt storage tank via an asphalt pump, an asphalt flowmeter, an asphalt back pressure device, and an asphalt three-way valve. The soap liquid is sent to the colloid mill from the soap liquid tank via a soap liquid pump, a three-way diversion regulating valve, a soap liquid flowmeter, a soap liquid back pressure device, and a soap liquid three-way valve. The colloid mill is used to mix the asphalt raw materials with the soap liquid to emulsify the asphalt to obtain a high-solid content oil-in-water emulsified asphalt, which is then sent to the emulsified asphalt product storage tank via an emulsified asphalt pipeline for heat-insulated and pressure-maintained storage.

[0074] S310, directly supplying the mixing equipment, the delivery pressure of the emulsified asphalt oil delivery pipeline is controlled at 0.50MPa;

[0075] Alternatively, a storage tank with heating, heat preservation, pressurization and pressure maintenance functions can be selected to transport the high-solid content oil-in-water emulsified asphalt to other on-site supply mixing equipment at a temperature ≥150°C and a pressure ≥0.50MPa.

[0076] Example 4

[0077] The solid content is set at 95%, the asphalt raw material (modified asphalt) flow rate is 9.5m³ / h, and the modified asphalt includes the following components by weight: 90 parts of base asphalt, 10 parts of SBS. The soap solution includes the following components by weight: 1.8 parts of slow-cracking and fast-setting emulsifier, 1.8 parts of hydrochloric acid with a mass concentration of 35%, 96.4 parts of water, and the flow rate is 0.5m³ / h.

[0078] The difference from Example 3 is that in step S302, the modified asphalt in the raw asphalt storage tank is preheated to 180°C, the soap in the soap tank is preheated to 70°C, the emulsified asphalt product storage tank is preheated and maintained at 170°C, and the pressure is increased and maintained at 0.7MPa; in step S304, the outlet pressure of the asphalt pump is 0.75MPa, the temperature is 180°C, and the flow rate is 9.5m³ / h, and the outlet pressure of the soap pump is 0.8MPa, the temperature is 70°C, and the flow rate is 0.5m³ / h. 3 / h; in step S306, the outlet pressure of the colloid mill is 0.72MPa and the temperature is 170°C; in step S310, the delivery pressure of the emulsified asphalt oil pipeline is controlled at 0.70MPa; the transportation conditions are controlled at temperature ≥170°C and pressure ≥0.70MPa.

[0079] The high-solid content oil-in-water emulsified asphalt produced and stored in Example 1 to Example 4 was sampled and tested respectively. The sampling time was the same day and after standing for 10 days. The test results are shown in Table 1 below.

[0080] Table 1 Test results of high solid content water-in-oil emulsified asphalt

[0081]

[0082] As can be seen from Table 1, the high-temperature, high-solid content, oil-in-water emulsified asphalt that can be prepared by the production and storage method of the embodiment of the present invention is based on base asphalt or modified asphalt as asphalt raw material, with a solid content of up to 75%-95%. The solid content of the produced and stored emulsified asphalt product is basically consistent with the set solid content under high pressure and high temperature production, storage and transportation. When the corresponding storage conditions are maintained and the solid content deviation rate of the laboratory test does not exceed 0.5%, the evaporation residue index is basically consistent. The precise controllability of the oil-stone ratio when mixing with the aggregate is guaranteed. At the same time, the production, storage and transportation of high-solid content oil-in-water emulsified asphalt are all in a flowing state, and can be directly applied to the normal temperature mixing or hot mixing of aggregates under normal pressure and high temperature. Moreover, when applied to mixing under normal pressure and high temperature, the viscosity is low, the aggregate is evenly coated, and the mixing efficiency is high. Compared with the conventional emulsified asphalt production process, the production and storage method of the embodiment of the present invention has a small amount of emulsifier and low water content while ensuring the emulsification stability effect. Compared with the conventional foamed asphalt production process, the production and storage method of the embodiment of the present invention is simple, reliable, and highly controllable, and can achieve large-scale production. At the same time, the emulsified asphalt product obtained by the production and storage method of the embodiment of the present invention has the excellent properties of high-temperature fluidity of asphalt, fluidity of emulsified asphalt, and low viscosity of foamed asphalt, and can be directly used for normal temperature mixing and hot mixing of new aggregate or recycled road pavement materials under normal pressure and high temperature.

[0083] Example 5

[0084] In a road maintenance project for a trunk highway, the 4 cm upper layer of the asphalt pavement was regenerated in situ at room temperature. The original pavement structure was AC16.

[0085] Use a synchronous gravel sealer to spread 13.2-16mm basalt gravel on the original road surface, with a spreading amount of 10kg / m 2 .

[0086] Normal temperature aggregates include old road pavement materials after milling and crushing, basalt crushed stones with a particle size of 13.2-16mm, and the mass ratio of basalt crushed stones to old road pavement materials is 8%. While milling the road surface, the old road pavement materials and the spread basalt crushed stones are directly transferred to the receiving hopper of the normal temperature mixing and paving machine.

[0087] The method for mixing emulsified asphalt and room temperature aggregate of the present invention comprises the following steps:

[0088] S502, according to the aggregate conditions, the solid content and initial temperature of the emulsified asphalt are determined according to a first preset formula, wherein the first preset formula includes:

[0089]

[0090] Wherein, L represents the mixing time, h; Characterized by the specific heat capacity of pure asphalt, it is 2.1 kJ / kg•℃; Characterized as the mass of pure asphalt in emulsified asphalt, kg; Characterized as the mass of water, kg; Characterized by the latent heat of vaporization of water at one atmosphere (0.1 MPa) and 100°C, 2257.2 kJ / kg; Characterized by the specific heat capacity of water, which is 4.2 kJ / kg•℃; It is represented by the surface heat transfer coefficient of asphalt and aggregate mixing, W / ㎡•℃; A is represented by the heat exchange area, that is, the total surface area of ​​aggregate, ㎡; Characterized by the initial temperature of the emulsified asphalt, °C; Characterized by the temperature of emulsified asphalt after mixing, °C; Characterized as the initial temperature of the aggregate, °C; Characterized by the temperature of aggregate after mixing, °C; Characterized as the mass of aggregate, kg; Characterized by the emulsion-to-aggregate ratio, %, the mass ratio of emulsified asphalt to aggregate; Characterized by the solid content of emulsified asphalt, %.

[0091] is 4%, Characterized by the surface heat transfer coefficient of asphalt and aggregate mixing, it is 0.2W / ㎡•℃ measured by experimental method. The specific surface area A of the aggregate is 5.84m 2 / kg. The target temperature T2 for mixability is 80℃. The initial temperature of aggregate is t1=30℃, and the estimated temperature after mixing is t2=31.2℃.

[0092] S504, in the pre-stored correspondence data table of the emulsified asphalt solid content and the initial temperature, traverse the emulsified asphalt solid content from large to small, and determine that the high-solid content oil-in-water emulsified asphalt solid content is 86%, and the initial temperature T1 is 155°C.

[0093] S506, according to the solid content and initial temperature of the emulsified asphalt, adjust the flow rate, temperature, pressure of the asphalt raw material and the flow rate, temperature and pressure of the soap solution in the emulsified asphalt production and storage method, and at the same time, control the temperature and pressure of the emulsified asphalt product storage tank and the transportation conditions, so that the emulsified asphalt, room temperature regeneration reinforcement agent, performance promoter, and aggregate that meet the solid content and initial temperature conditions are added into the mixing bin of the room temperature mixing and paving integrated machine for mixing to obtain an asphalt mixture.

[0094] The emulsified asphalt used is modified asphalt as the asphalt raw material. The modified asphalt includes 85 parts of base asphalt, 7 parts of SBS, 5 parts of SBR, and 3 parts of SEBS. The asphalt raw material flow rate is 8.6m³ / h, the temperature is 180℃, and the pressure is 0.65MPa; the emulsifier uses a slow-cracking and fast-setting emulsifier, and the soap solution includes 3.6 parts of slow-cracking and fast-setting emulsifier, 3.6 parts of hydrochloric acid with a mass concentration of 35%, and 92.8 parts of water. The flow rate is 1.4m³ / h, the temperature is 78℃, and the pressure is 0.7MPa; the temperature of the emulsified asphalt product storage tank is 155℃, and the pressure is 0.55MPa; the transportation conditions are temperature ≥155℃, and pressure ≥0.55MPa. The results of the emulsified asphalt detection technical indicators used are shown in Table 2 below.

[0095] Table 2 Testing technical indicators of high solid content oil-in-water emulsified asphalt used

[0096]

[0097] The mass ratio of the room temperature regeneration reinforcing agent to the aggregate is 0.5%. The room temperature regeneration reinforcing agent contains a high molecular active group and is a product disclosed by the applicant in a method for cold in-situ regeneration of polymorphic asphalt in a road asphalt pavement surface layer in CN117306339A. The regeneration and reinforcement of aged asphalt is achieved at room temperature. It has the effect of penetrating at room temperature, dissolving the aged asphalt film on the surface of the aggregate so that the aged asphalt quickly has a certain flow state, and at the same time replenishes the active groups.

[0098] The mass ratio of the performance accelerator to the aggregate is 3%. The performance accelerator is a product disclosed in the applicant CN117306339A, a method for in-situ cold regeneration of polymorphic asphalt in the surface layer of a road asphalt pavement. It has high modulus, high toughness and fast setting and early strength functions. The performance accelerator contains polar substances, surfactants, demulsifiers and cross-linking agents, which can increase lubricity and improve permeability.

[0099] The mixed asphalt mixture is evenly spread on the road surface with a designed thickness of 4cm using a normal temperature mixing and paving machine; after paving, it is compacted using the flow operation method.

[0100] Comparative Example 1

[0101] Conventional low-solid emulsified asphalt was produced by conventional methods using the same modified asphalt and slow-crack, fast-setting emulsifier as in Example 5. To meet the mixing time requirement, the soap solution included 7.5 parts of slow-crack, fast-setting emulsifier, 7.5 parts of hydrochloric acid with a mass concentration of 35%, and 85 parts of water. The detection technical indicators are shown in Table 3 below, where the evaporation residue technical indicators are basically consistent with those in Table 2, and the specific data deviation is caused by the detection error.

[0102] Table 3 Testing technical indicators of conventional low-solid emulsified asphalt

[0103]

[0104] The prepared conventional low-solid emulsified asphalt was mixed with the old road pavement material and the basalt crushed stone at the same oil-stone ratio, equivalent to a milk-stone ratio of 5.73%. During the mixing process, water was added according to 6% of the mass of the old road pavement material and the basalt crushed stone to ensure construction and workability. The comprehensive moisture content of the asphalt mixture after mixing was 7.42%. It was evenly spread on the road surface with a designed thickness of 4cm using a normal temperature mixing and paving machine; it was compacted using a flow operation method.

[0105] Table 4 Comparison of emulsified asphalt components used in Example 5 and Comparative Example 1

[0106]

[0107] Table 5 Comparison of asphalt mixtures of Example 5 and Comparative Example 1

[0108]

[0109] According to the Technical Specifications for Highway Asphalt Pavement Construction (JTG F40) and the Test Procedures for Asphalt and Asphalt Mixtures for Highway Engineering (JTG E20), for Example 5 and Comparative Example 1, the mixture was taken at room temperature on site, and the test specimens were prepared in the laboratory according to the specifications, and after curing in a 60°C oven for the prescribed time, the test specimens were tested. The test results are shown in Table 6 below.

[0110] Table 6 Test results of in-situ room temperature recycled asphalt mixture

[0111]

[0112] Based on the above Tables 4, 5 and 6, we can conclude that:

[0113] (1) The emulsifier content in the emulsified asphalt of Example 5 of the present invention is 0.5%, while the emulsifier content in the emulsified asphalt of Comparative Example 1 is 3%. The amount of emulsifier used in Example 5 is reduced by more than 80% compared with that in Comparative Example 1. Based on the market price of the slow-cracking and fast-setting emulsifier of RMB 35,000 per ton, the material cost is saved by RMB 56.6 per ton of mixture.

[0114] (2) At the same asphalt-stone ratio, the residual emulsifier rate in the mixture of Example 5 is 0.02%, while that in Comparative Example 1 is as high as 0.17%. The residual emulsifier in the mixture of Example 5 is reduced by about 88% compared with that in Comparative Example 1. A higher residual emulsifier is not conducive to the water resistance of the mixture. The residual emulsifier rate in the asphalt mixture of the mixing method of Example 5 of the present invention is lower and has better water resistance.

[0115] (3) The emulsified asphalt in Comparative Example 1 has a low solid content and requires 6% additional water to ensure construction and workability. The comprehensive moisture content is as high as 7.42%. The curing time of the mixture is as long as 24 hours, the strength is slowly formed, and the construction efficiency is low. However, in Example 5 of the present invention, no additional water is required during the mixing process, the comprehensive moisture content is as low as 0.5%, the curing time is only 3 hours, the strength is quickly formed, and the construction efficiency is high. Compared with Comparative Example 1, the comprehensive moisture content of the mixture in Example 5 is reduced by about 93%, and the curing time is shortened by about 88%.

[0116] (4) The asphalt mixture obtained in Example 5 of the present invention was used to prepare test pieces in accordance with the specifications indoors. After curing in an oven at 60°C for 3 hours, the test pieces were completely formed and could be tested. However, the asphalt mixture obtained in Comparative Example 1 was used to prepare test pieces in accordance with the specifications in the laboratory. After curing in an oven at 60°C for 3 hours, the test pieces could not be completely formed and could not be tested. The dynamic stability, water stability, low temperature bending test failure strain, fatigue resistance and other performance indicators of the test pieces cured in an oven at 60°C for 3 hours prepared by the asphalt mixture obtained in Example 5 of the present invention were close to those of the test pieces cured for 24 hours. It can be seen that the asphalt mixture obtained by the mixing method of the present invention can significantly improve the early strength and greatly shorten the curing time. Compared with conventional emulsified asphalt, the curing time is shortened by more than 88%.

[0117] (5) The void ratio of Example 5 of the present invention after curing for 3 hours is 4.2%, and the void ratio after curing for 24 hours is 4.5%. The specimen of Comparative Example 1 after curing for 3 hours cannot be formed, and the void ratio after curing for 24 hours is 10.5%. Under the condition of curing for 24 hours, the void ratio of Example 5 is 57.1% lower than that of Comparative Example 1, which is mainly caused by the high comprehensive water content in Comparative Example 1. Therefore, the dynamic stability, water stability, low-temperature bending test failure strain, fatigue resistance, etc. are significantly lower than those of Example 5. Even though the oil-stone ratio and binder performance indicators are the same, the performance of the mixture of Comparative Example 1 is significantly lower than that of Example 5.

[0118] (6) The parameters in the production and storage method are adjusted according to the formula model by using the room temperature mixing method of the present invention, and the solid content and initial temperature of the emulsified asphalt are accurately controlled. The high solid content emulsified asphalt is used at normal pressure and high temperature, and can be directly mixed with the aggregate at room temperature. The emulsified asphalt has good fluidity at normal pressure and high temperature, and the specific surface area of ​​asphalt is increased and the viscosity is low in the fine foaming state, which can promote the uniformity of asphalt coating on the aggregate. No external water is required during mixing, which can ensure construction and workability. The comprehensive moisture content of the asphalt mixture after mixing is as low as 0.5%. Moreover, the initial temperature of the emulsified asphalt is 155°C, and the water is in a high temperature state, which is conducive to the volatilization of water, which is conducive to improving the early strength and greatly shortening the curing time.

[0119] Example 6

[0120] In a highway pavement preventive maintenance project, the original pavement was overlaid with MS-3 micro-surfacing with a thickness of 8mm.

[0121] Table 7 Mineral gradation and pass rate of MS-3 micro-surfacing mixture

[0122]

[0123] The mass ratio of cement to mineral mixture is 1%, and the cement grade is P·O32.5.

[0124] The method for mixing emulsified asphalt and aggregate at room temperature of the present invention comprises the following steps:

[0125] S602, according to the aggregate conditions, the solid content and initial temperature of the emulsified asphalt are determined according to a first preset formula, wherein the first preset formula includes:

[0126]

[0127] Wherein, L represents the mixing time, h; Characterized by the specific heat capacity of pure asphalt, it is 2.1 kJ / kg•℃; Characterized as the mass of pure asphalt in emulsified asphalt, kg; Characterized as the mass of water, kg; Characterized by the latent heat of vaporization of water at one atmosphere (0.1 MPa) and 100°C, 2257.2 kJ / kg; Characterized by the specific heat capacity of water, which is 4.2 kJ / kg•℃; It is represented by the surface heat transfer coefficient of asphalt and aggregate mixing, W / ㎡•℃; A is represented by the heat exchange area, that is, the total surface area of ​​aggregate, ㎡; Characterized by the initial temperature of the emulsified asphalt, °C; Characterized by the temperature of emulsified asphalt after mixing, °C; Characterized as the initial temperature of the aggregate, °C; Characterized by the temperature of aggregate after mixing, °C; Characterized as the mass of aggregate, kg; Characterized by the emulsion-to-aggregate ratio, %, the mass ratio of emulsified asphalt to aggregate; Characterized by the solid content of emulsified asphalt, %.

[0128] is 8%, Characterized by the surface heat transfer coefficient of asphalt and aggregate mixing, it is 0.2W / ㎡•℃ measured by experimental method. The specific surface area A of the aggregate is 6.05m 2 / kg. The target temperature T2 for mixability is 80℃. The initial temperature of aggregate is t1=30℃, and the estimated temperature after mixing is t2=31.5℃.

[0129] S604, in the pre-stored correspondence data table of the emulsified asphalt solid content and the initial temperature, traverse the emulsified asphalt solid content from large to small, and determine that the high-solid content oil-in-water emulsified asphalt solid content is 92% and the initial temperature T1 is 140°C.

[0130] S606, according to the solid content and initial temperature of the emulsified asphalt, adjust the flow rate, temperature, pressure of the asphalt raw material and the flow rate, temperature, pressure of the soap solution in the emulsified asphalt production and storage method, and at the same time, control the temperature and pressure of the emulsified asphalt product storage tank and the transportation conditions, so that the emulsified asphalt, MS-3 type micro-surfacing mineral material, and P·O32.5 cement that meet the solid content and initial temperature conditions can be mixed together evenly, and no external water is required during the mixing process.

[0131] The emulsified asphalt used uses modified asphalt as the asphalt raw material. The modified asphalt includes 88.4 parts of Donghai brand 70# base asphalt, 5.4 parts of SBR (styrene-butadiene rubber) latex with an effective solid content of 60%, the asphalt raw material flow rate is 18.38 m³ / h, the temperature is 150℃, and the pressure is 0.55MPa; the emulsifier is a slow-cracking and fast-setting emulsifier, the soap solution includes 4.9 parts of slow-cracking and fast-setting emulsifier, 4.9 parts of hydrochloric acid with a mass concentration of 35%, and 90.2 parts of water, with a flow rate of 1.62 m³ / h, a temperature of 70℃, and a pressure of 0.60MPa; the temperature of the emulsified asphalt product storage tank is 140℃, and the pressure is 0.40MPa; the transportation conditions are temperature ≥140℃, pressure ≥0.40MPa.

[0132] The test technical index results of the high solid content emulsified asphalt used are shown in Table 8 below.

[0133] Table 8 Technical indicators for testing high solid content emulsified asphalt

[0134]

[0135] Spread the mixed asphalt mixture on the original road surface, let it cure naturally for 1 hour without rainfall at an ambient temperature of 20℃, and then use a 3t double steel wheel roller to roll it 4 times. After rolling, it can be opened to traffic.

[0136] Comparative Example 2

[0137] Low-solid emulsified asphalt was prepared by conventional method according to the following formula: 57.4 parts of Donghai brand 70# base asphalt, 3.5 parts of SBR (styrene butadiene rubber) latex with an effective solid content of 60%, 3 parts of slow-cracking and fast-setting emulsifier, 3 parts of hydrochloric acid with a mass concentration of 35%, and 33.1 parts of water; wherein the mass percentage of the effective component of SBR (styrene butadiene rubber) to the base asphalt in Example 6 and Comparative Example 2 was the same, both being 3.7%. Conventional low-solid emulsified asphalt was prepared, and the detection technical indicators of conventional low-solid emulsified asphalt are shown in Table 9 below.

[0138] Table 9 Conventional low solid emulsified asphalt testing technical indicators

[0139]

[0140] The index of evaporation residue of low-solid emulsified asphalt in Table 9 is basically consistent with the index of evaporation residue of high-solid emulsified asphalt in Table 8, and the numerical deviation is the detection error. The conventional low-solid emulsified asphalt prepared is mixed with aggregates according to the same oil-stone ratio, equivalent to 11.8% of the milk-stone ratio. During the mixing process, water is added according to 5% of the mass of the aggregate to ensure the workability of the mixture mixing and paving. The mixed asphalt mixture is spread on the original road surface. After natural curing for 4 hours without rainfall at an ambient temperature of 20°C, a 3t double steel wheel roller is used for static compaction 4 times. Traffic is opened after rolling.

[0141] Table 10 Comparison of emulsified asphalt components used in Example 6 and Comparative Example 2

[0142]

[0143] Note: In Example 6 and Comparative Example 2, the mass percentage of the effective ingredients in SBR (styrene-butadiene rubber) to Donghai brand 70# base asphalt is 3.7%.

[0144] Table 11 Comparison of asphalt mixtures of Example 6 and Comparative Example 2

[0145]

[0146] The asphalt mixture and micro-surfacing curing layer obtained in Example 6 and Comparative Example 2 were tested for performance indicators, and the test results are shown in Table 12 below.

[0147] Table 12 Performance indexes of asphalt mixture and micro-surfacing

[0148]

[0149] Based on the above Tables 10, 11 and 12, we can conclude that:

[0150] (1) The emulsifier content in the emulsified asphalt of Example 6 of the present invention is 0.4%, while the emulsifier content in the emulsified asphalt of Comparative Example 2 is 3%. The amount of emulsifier used in Example 6 is reduced by more than 86% compared with that in Comparative Example 2. Based on the market price of the slow-cracking and fast-setting emulsifier of RMB 35,000 per ton, the cost of each ton of mixture is saved by RMB 120.5.

[0151] (2) At the same asphalt-stone ratio, the residual emulsifier rate in the mixture of Example 6 is 0.03%, while that in Comparative Example 2 is as high as 0.33%. The residual emulsifier in the mixture of Example 6 is reduced by about 90% compared with that in Comparative Example 2. A higher residual emulsifier is not conducive to the water resistance of the mixture. The residual emulsifier rate in the asphalt mixture of the mixing method of Example 6 of the present invention is lower and has better water resistance.

[0152] (3) The emulsified asphalt in Comparative Example 2 has a low solid content and requires 5% additional water to ensure construction and workability. The comprehensive moisture content is as high as 8.1%. The curing time of the mixture is as long as 4 hours, the strength is slowly formed, and the construction efficiency is low. However, in Example 6, no additional water is required during the mixing process, the comprehensive moisture content is 0.6%, the curing time is 1 hour, the strength is formed quickly, and the construction efficiency is high. Compared with Comparative Example 1, the comprehensive moisture content of the mixture in Example 6 is reduced by about 92%, and the curing time is shortened by 75%.

[0153] (4) The mixing time in Example 6 of the present invention is 104 seconds longer than that in Comparative Example 2, and the mixture has better construction and workability. The demulsification time in Example 6 of the present invention is only 1 minute, which is 6.5 minutes shorter than that in Comparative Example 2. Since the high-solid content emulsified asphalt has good fluidity at high temperature, the asphalt fine foaming specific surface area is increased and the viscosity is low, which can promote the uniformity of asphalt coating on the aggregate, and thus does not affect the construction and workability. The cohesion index of the mixture in Example 6 of the present invention reaches 2.05 at 30 minutes and is moderately formed, while the cohesion index of the mixture in Comparative Example 2 is 1.25 at 30 minutes and is primarily formed. The cohesion index of the mixture in Example 6 is improved by 64% at 30 minutes compared with that in Comparative Example 2, and the mixture is formed quickly.

[0154] (5) The parameters in the production and storage method are adjusted according to the formula model by using the room temperature mixing method of the present invention, the solid content and initial temperature of the emulsified asphalt are accurately controlled, and the high solid content emulsified asphalt is used at normal pressure and high temperature, and can be directly mixed with the aggregate at room temperature, without the need for adding water during mixing, which has a positive effect on improving the strength and durability of the micro-surface. Under the same curing conditions, the curing time of Example 6 is shortened by 3 hours compared with that of Comparative Example 2, which is conducive to improving construction efficiency.

[0155] Example 7

[0156] A provincial highway asphalt pavement overhaul project adopted a 4cm top layer factory-mixed hot regeneration process. The mass ratio of SBS (thermoplastic styrene-butadiene rubber) to base asphalt in the modified asphalt used to prepare high-solid emulsified asphalt was 4.2%.

[0157] Table 13 Test indicators of high solid emulsified asphalt used

[0158]

[0159] Using a 4000-type mixing unit, the production capacity of each batch of old road pavement materials, namely old asphalt mixture (including old aggregate and old asphalt) is 4000kg. The laboratory measured that the old asphalt content in the old asphalt mixture is 3.8%, the initial temperature T1 of the high-solid content oil-in-water emulsified asphalt is 150°C, the solid content of the emulsified asphalt is 88%, and the emulsion-stone ratio is 2.5%.

[0160] The hot mixing method of the high-solid content water-in-oil emulsified asphalt obtained by the emulsified asphalt production and storage method of the present invention and the old road pavement material comprises the following steps:

[0161] S702, according to the emulsified asphalt and the total aggregate, the heating temperature of the total aggregate is determined according to a second preset formula, where the second preset formula includes:

[0162]

[0163] in, Characterized by the heating temperature of the total aggregate, °C; Characterized as the mass of total aggregate to be heated, 4000 kg; Characterized by the mass of old asphalt in the old road pavement material, 152kg; Characterized as the mass of old aggregate in the old road pavement material, 3848kg; Characterized as emulsified asphalt mass, 100 kg; Characterized by the emulsion-to-stone ratio, 2.5%, the mass ratio of emulsified asphalt to total aggregate; Characterized by emulsified asphalt solid content, 88%; Characterized by the latent heat of vaporization of water at one atmosphere (0.1 MPa) and 100°C, 2257.2 kJ / kg; Characterized by the specific heat capacity of pure asphalt, 2.1 kJ / kg•℃; Characterized by the initial temperature of the emulsified asphalt, 150°C; Characterized by the specific heat capacity of the aggregate, 0.85 kJ / kg•℃; Characterized by the discharge temperature after mixing, 140°C.

[0164] After calculation, the heating temperature of the total aggregate , which is 147.3℃.

[0165] S704, after heating the aggregate according to the determined heating temperature of the aggregate, mix it evenly with the emulsified asphalt, the mass ratio of the emulsified asphalt to the total aggregate is 2.5%, and the mass ratio of the regeneration agent to the total aggregate is 0.8%.

[0166] Comparative Example 3

[0167] In the factory-mixed hot regeneration, low-solid emulsified asphalt was added according to conventional technical means, and the detection technical indicators were shown in Table 14. The modified asphalt formula for preparing low-solid emulsified asphalt was the same as that in Example 7.

[0168] Table 14 Low solid content emulsified asphalt test indicators

[0169]

[0170] Comparative Example 4

[0171] In the factory-mixed hot regeneration, 175°C modified asphalt is added according to conventional technical means, and the modified asphalt formula is the same as that of Example 7. The detection technical indicators are shown in Table 15 below.

[0172] Table 15 Modified asphalt test indicators

[0173]

[0174] The Example 7 using the high solid content emulsified asphalt of the present invention was compared with the Comparative Example 3 using the conventional low solid content emulsified asphalt. The comparison results are shown in Tables 16 and 17 below.

[0175] Table 16 Emulsified asphalt composition used in Example 7 and Comparative Example 3

[0176]

[0177] Note: In Example 7 and Comparative Example 3, the mass percentage of SBS (thermoplastic styrene-butadiene rubber) and Donghai brand 70# matrix asphalt is 4.2%.

[0178] Table 17 Comparison of asphalt mixtures of Example 7 and Comparative Example 3

[0179]

[0180] For the factory-mixed hot-regenerated asphalt mixture of Example 7 using high-solid content emulsified asphalt, the factory-mixed hot-regenerated asphalt mixture of Comparative Example 3 using conventional low-solid content emulsified asphalt, and the factory-mixed hot-regenerated asphalt mixture of Comparative Example 4 using conventional modified asphalt, the mixtures were taken on-site, and test specimens were prepared indoors according to the specifications for performance testing. The performance indicators are shown in Table 18 below.

[0181] Table 18 Performance test results of recycled asphalt mixture

[0182]

[0183] Based on Table 16, Table 17 and Table 18 above, we can conclude that:

[0184] (1) The emulsifier content in the emulsified asphalt of Example 7 of the present invention is 0.3%, while the emulsifier content in the emulsified asphalt of Comparative Example 3 is 1%. The amount of emulsifier used in Example 7 is reduced by 70% compared with that in Comparative Example 3; at the same oil-to-rock ratio, based on the market price of the fast-cracking emulsifier of RMB 30,000 / ton, the cost of each ton of mixture is saved by RMB 11.6.

[0185] (2) The initial moisture content of the emulsified asphalt mixture of Example 7 of the present invention is 0.29%, the initial water temperature is 150°C, and no additional heat energy is required for the complete evaporation of water; the initial moisture content of the emulsified asphalt mixture of Comparative Example 3 is 1.15%, the initial water temperature is 30°C, and 29338.8 kJ of additional heat energy is required for the complete evaporation of water in each ton of the mixture.

[0186] (3) It is calculated by the second preset formula that, under the premise of meeting the discharge temperature of 140°C, the aggregate heating temperature of Example 7 is 147.3°C, and the aggregate heating temperature of Comparative Example 3 is 177.4°C. The aggregate heating temperature of Example 7 is 30.1°C lower than that of Comparative Example 3, with a reduction of 17%. The energy saving during the heating process of each ton of mixed material is 27014.75 kJ. Calculated based on the market price of natural gas of 7000 yuan / ton, the heating cost is saved by 7.63 yuan / ton.

[0187] In summary, for every ton of mixture produced, the emulsifier saves 11.6 yuan in material costs, and aggregate heating saves 7.63 yuan in fuel costs, totaling 19.23 yuan per ton.

[0188] (4) Through indoor testing, it can be seen from Table 18 that the performance of the factory-mixed hot recycled asphalt mixture based on emulsified asphalt in Example 7 of the present invention is significantly better than the recycled asphalt mixture obtained by conventionally adding hot modified asphalt in Comparative Example 4. The water content of the emulsified asphalt in Example 7 of the present invention is moderate, and the water vaporizes when heated. Its vaporization shock effect is conducive to breaking up the agglomeration of the old material, thereby improving the quality and life of the recycled mixture. At the same time, in conjunction with the precise calculation of the formula model proposed in the present invention, the heating temperature is more accurate, and the aggregate heating temperature is reduced to below 150°C, which is safer, more reliable, and easier to control. Compared with Comparative Example 3, the heating temperature is significantly lower, and it is not easy to produce harmful gases, which slows down the further thermal aging of the old material in the heating drum.

[0189] Example 8

[0190] A highway pavement maintenance project uses an in-situ hot regeneration process, and the original pavement structure is SMA13. In the modified asphalt used to prepare high-solid emulsified asphalt, the mass ratio of SBS (thermoplastic styrene butadiene rubber) to base asphalt is 4%.

[0191] Table 19 High solid content emulsified asphalt test indicators

[0192]

[0193] The synchronous gravel sealer was used to spread 9.5-13.2mm basalt gravel on the original road surface, with a spreading amount of 9.5kg / ㎡. The total aggregate was old asphalt mixture and basalt gravel with a particle size of 9.5-13.2mm. The mass ratio of basalt gravel to old asphalt mixture was 6.8%. The laboratory measured that the old asphalt content in the old asphalt mixture was 3.8%, the initial temperature T1 of the high-solid content oil-in-water emulsified asphalt was 151℃, the solid content of the emulsified asphalt was 86.2%, and the emulsion-stone ratio was 1.5%.

[0194] S802, according to the emulsified asphalt and the total aggregate, the heating temperature of the total aggregate is determined according to a second preset formula, the second preset formula comprising:

[0195]

[0196] in, Characterized by the heating temperature of the total aggregate, °C; The mass of the total aggregate to be heated is represented by 1000 kg as the unit of measurement, 1000 kg; Characterized by the mass of old asphalt in the old road pavement material, 35.58 kg; It is represented by the sum of the mass of old aggregate and newly added stone in the old road pavement material, 964.42kg; Characterized by emulsified asphalt mass, 15 kg; Characterized by the emulsion-to-stone ratio, 1.5%, the mass ratio of emulsified asphalt to total aggregate; Characterized by emulsified asphalt solid content, 86.2%; Characterized by the latent heat of vaporization of water at one atmosphere (0.1 MPa) and 100°C, 2257.2 kJ / kg; Characterized by the specific heat capacity of pure asphalt, 2.1 kJ / kg•℃; Characterized by the initial temperature of the emulsified asphalt, 151°C; Characterized by the specific heat capacity of the aggregate, 0.85 kJ / kg•℃; Characterized by the discharge temperature after mixing, 150°C.

[0197] After calculation, the heating temperature of the total aggregate , which is 155.3℃.

[0198] S804, heating the road surface on which the basalt crushed stones are spread according to the determined heating temperature of the aggregate.

[0199] S806, using a harrow to harrow the heated and softened road surface.

[0200] S808: Use a remixer to evenly remix the loosened total aggregate, high-solid content oil-in-water emulsified asphalt and regeneration agent. The mass ratio of high-solid content oil-in-water emulsified asphalt to total aggregate is 1.5%, and the mass ratio of regeneration agent to total aggregate is 0.3%.

[0201] The remixed recycled material is spread on the road surface using a paver, and then compacted using a rubber-wheeled roller and a double-steel-wheeled roller in accordance with the specifications. After the hot regeneration and compaction is completed, traffic is allowed when the surface temperature of the recycled layer is below 50°C.

[0202] Comparative Example 5

[0203] In the in-situ hot regeneration, low solid emulsified asphalt is added, and the modified asphalt formula for preparing low solid emulsified asphalt is the same as that in Example 8. The low solid emulsified asphalt is preheated to 80° C. The technical indicators of the low solid emulsified asphalt are shown in Table 20 below.

[0204] Table 20 Low solid content emulsified asphalt test indicators

[0205]

[0206] Comparative Example 6

[0207] In the in-situ hot regeneration, 175°C modified asphalt is added. The modified asphalt formula is the same as Example 8. The technical indicators of the modified asphalt are shown in Table 21 below.

[0208] Table 21 Modified asphalt test indicators

[0209]

[0210] Example 8 using the high-solid content emulsified asphalt of the present invention is compared with Comparative Example 5 using conventional low-solid content emulsified asphalt, and the comparison results are shown in Tables 22 and 23 below.

[0211] Table 22 Emulsified asphalt composition used in Example 8 and Comparative Example 5

[0212]

[0213] Note: In Example 8 and Comparative Example 5, the mass ratio of SBS (thermoplastic styrene-butadiene rubber) to Donghai brand 70# base asphalt is 4%.

[0214] Table 23 Comparison of asphalt mixture conditions of Example 8 and Comparative Example 5

[0215]

[0216] For the recycled mixture of Example 8 using high-solid content emulsified asphalt, the recycled mixture of Comparative Example 5 using conventional low-solid content emulsified asphalt, and the recycled mixture of Comparative Example 6 using thermally modified asphalt, the mixture was taken on-site and test specimens were prepared in the laboratory according to the specifications for performance testing. The comparison results are shown in Table 24 below.

[0217] Table 24 Performance test of recycled mixture paving road

[0218]

[0219] Based on Table 22, Table 23 and Table 24, we can conclude that:

[0220] (1) The emulsifier content in the emulsified asphalt of Example 8 of the present invention is 0.25%, and the emulsifier content in the emulsified asphalt of Comparative Example 5 is 1%. The emulsifier usage in Example 8 is 0.75% less than that in Comparative Example 5, a decrease of 75%; at the same oil-to-rock ratio, based on the market price of the fast-cracking emulsifier of RMB 30,000 / ton, the cost per ton of mixture is saved by RMB 5.33;

[0221] (2) The initial moisture content of the emulsified asphalt mixture of Example 8 of the present invention is 0.2%, the initial water temperature is 151°C, and no additional heat energy is required for the complete evaporation of water; the initial moisture content of the emulsified asphalt mixture of Comparative Example 5 is 0.5%, the initial water temperature is 80°C, and 11706 kJ of additional heat energy is required for the complete evaporation of water per ton of mixture.

[0222] (3) It is calculated by the second preset formula that, under the premise of meeting the discharge temperature of 150°C, the aggregate heating (raking) temperature of Example 8 is 155.3°C, and the aggregate heating (raking) temperature of Comparative Example 5 is 165.3°C. The aggregate heating temperature of Example 8 is 10°C lower than that of Comparative Example 5, with a reduction of more than 6%. The energy saving during the heating process of each ton of mixed material is 8975 kJ. Calculated at the market price of natural gas of 7000 yuan / ton, the heating cost is saved by 2.54 yuan / ton.

[0223] In summary, for every ton of mixture produced, the emulsifier saves 4.8 yuan in material costs, and aggregate heating saves 2.54 yuan in fuel costs, totaling 7.34 yuan per ton.

[0224] (5) Through indoor testing, it can be seen from Table 24 that the performance of the in-situ hot-regenerated asphalt mixture based on emulsified asphalt in Example 8 of the present invention is significantly better than the regenerated asphalt mixture obtained by conventionally adding heat-modified asphalt in Comparative Example 6. The water content of the emulsified asphalt in Example 8 of the present invention is moderate, and the water vaporizes when heated. The vaporization shock effect is conducive to breaking up the agglomeration of the old material, thereby improving the quality and life of the regenerated mixture. At the same time, in conjunction with the precise calculation of the formula model proposed in the present invention, the heating temperature is more accurate, and the aggregate heating temperature is reduced to below 160°C, which is safer, more reliable, and easier to control. Compared with Comparative Example 5, the heating temperature is significantly lower, and it is not easy to produce harmful gases, which slows down the thermal aging of the old material during the heating and loosening process.

[0225] In summary, the high-solid content oil-in-water emulsified asphalt of the present invention is produced, stored and transported under high pressure and high temperature, and is used at normal pressure and high temperature without cooling. The asphalt is more likely to form a film and self-polymerize, which ensures construction and workability, reduces construction conditions, and improves construction pavement performance.

[0226] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for producing and storing emulsified asphalt, characterized in that: The following steps are involved: The asphalt raw material and soap solution are pumped to the colloid mill for mixing and emulsification according to the designed ratio to obtain high-solid content oil-in-water emulsified asphalt, which is directly transported to the emulsified asphalt product storage tank for heat preservation and pressure storage. The solid content of the emulsified asphalt is 75%-95%. Among them, the pressure of the asphalt raw material is controlled at 0.5-1.0Mpa, and the temperature is controlled at 150-180℃; the pressure of the soap liquid is controlled at 0.5-1.0MPa, and the temperature is controlled at 65-80℃. The soap liquid is prepared by emulsifier and water, and the proportion of emulsifier in the soap liquid is 0.5-5%; the flow ratio of the asphalt raw material to the soap liquid is (3-19):1; the temperature of the emulsified asphalt product storage tank is controlled at 130-180℃, and the pressure is controlled at 0.30-0.80Mpa. The storage pressure is the pressure at which water does not vaporize at the corresponding storage temperature; the outlet pressure of the colloid mill is controlled at 0.5-1.0MPa, the outlet temperature is controlled at 130-180℃, and the rotation speed is controlled at 1450-2900r / min; The specific steps include: S1, preheat the raw asphalt to 150-180℃, preheat the soap solution to 65-80℃, preheat the emulsified asphalt product storage tank and keep the temperature at 130-180℃, increase the pressure and maintain it at 0.30-0.80MPa; S2, regulating and stabilizing the flow rate, temperature and pressure of the raw asphalt raw material through the self-circulation of the raw asphalt pipeline, and regulating and stabilizing the flow rate, temperature and pressure of the soap liquid through the self-circulation of the soap liquid pipeline, wherein the outlet pressure of the asphalt pump in the raw asphalt pipeline is controlled at 0.5-1.0MPa, the temperature is 150-180°C, and the outlet pressure of the soap liquid pump in the soap liquid pipeline is controlled at 0.5-1.0MPa, the temperature is 65-80°C; S3, open the inlet valve of the emulsified asphalt product storage tank, start the colloid mill, and control the raw asphalt pipeline and the soap liquid pipeline to be connected to the inlet side of the colloid mill respectively; S4, the asphalt raw material is sent from the raw asphalt storage tank to the colloid mill via the raw asphalt pipeline, and the soap liquid is sent from the soap liquid tank to the colloid mill via the soap liquid pipeline. The asphalt raw material and the soap liquid are mixed and emulsified by the colloid mill to obtain high-temperature and high-solid content oil-in-water emulsified asphalt, which is sent to the emulsified asphalt product storage tank via the emulsified asphalt pipeline for heat-insulated and pressure-maintained storage.

2. The method for producing and storing emulsified asphalt according to claim 1, characterized in that: When the asphalt raw material is base asphalt, in step S1, the asphalt raw material is preheated to 150-170°C, the soap solution is preheated to 65-70°C, and the emulsified asphalt product storage tank is kept at a constant temperature of 130-160°C and a constant pressure of 0.30-0.60MPa; in step S2, the outlet temperature of the asphalt pump is controlled at 150-170°C, and the outlet temperature of the soap solution pipeline is controlled at 65-70°C.

3. The method for producing and storing emulsified asphalt according to claim 1, characterized in that: When the asphalt raw material is modified asphalt, in step S1, the asphalt raw material is preheated to 170-180°C, the soap solution is preheated to 70-80°C, and the emulsified asphalt product storage tank is kept at a constant temperature of 150-180°C and a constant pressure of 0.50-0.80MPa; in step S2, the outlet temperature of the asphalt pump is controlled at 170-180°C, and the outlet temperature of the soap solution pipeline is controlled at 70-80°C.

4. An emulsified asphalt, characterized in that: The emulsified asphalt is obtained by the production and storage method of emulsified asphalt described in any one of claims 1 to 3 above, and the emulsified asphalt is of oil-in-water type, has a solid content of 75%-95%, a storage temperature of 130-180°C, and a storage pressure of 0.30-0.80MPa, and the storage pressure is the pressure at which water does not vaporize at the corresponding storage temperature.

5. A method for transporting emulsified asphalt according to claim 4, characterized in that: The high-temperature, high-solid content, oil-in-water emulsified asphalt in the emulsified asphalt product storage tank is directly sent to the transfer storage tank via the emulsified asphalt oil delivery pipeline. The delivery pressure of the emulsified asphalt oil delivery pipeline is controlled at 0.30-0.80MPa, and the transfer conditions are controlled at a temperature of 130-180℃ and a pressure of 0.30-0.80MPa.

6. The method for transporting emulsified asphalt according to claim 5, characterized in that: When the emulsified asphalt in the emulsified asphalt product storage tank is obtained from base asphalt, the delivery pressure of the emulsified asphalt oil pipeline is controlled at 0.30-0.60 MPa; the transportation conditions are controlled at a temperature of 130-160° C. and a pressure of 0.30-0.60 MPa.

7. The method for transporting emulsified asphalt according to claim 6, characterized in that: When the emulsified asphalt in the emulsified asphalt product storage tank is obtained from modified asphalt, the delivery pressure of the emulsified asphalt oil pipeline is controlled at 0.50-0.80 MPa; the transportation conditions are controlled at a temperature of 150-180° C. and a pressure of 0.50-0.80 MPa.

8. A method for using the emulsified asphalt according to claim 4, characterized in that: The high-temperature and high-solid emulsified asphalt in the emulsified asphalt product storage tank or transfer tank is directly sent to the mixing equipment through the emulsified asphalt oil delivery pipeline for mixing with various graded aggregates. The emulsified asphalt oil delivery pipeline maintains the initial temperature and the delivery pressure is controlled at 0.30-0.80MPa.

9. A method for mixing emulsified asphalt with room temperature aggregate according to claim 4, characterized in that: The following steps are involved: According to the aggregate conditions, the solid content and initial temperature of the emulsified asphalt are determined according to the first preset formula. The first preset formula includes: Wherein, L represents the mixing time, h; Characterized as the specific heat capacity of pure asphalt, kJ / kg•℃; Characterized as the mass of pure asphalt in emulsified asphalt, kg; Characterized as the mass of water, kg; Characterized by the latent heat of vaporization of water at one atmosphere (0.1 MPa) and 100°C, 2257.2 kJ / kg; Characterized by the specific heat capacity of water, kJ / kg•℃; It is represented by the surface heat transfer coefficient of asphalt and aggregate mixing, W / ㎡•℃; A is represented by the heat exchange area, that is, the total surface area of ​​aggregate, ㎡; Characterized by the initial temperature of the emulsified asphalt, °C; Characterized by the temperature of emulsified asphalt after mixing, °C; Characterized as the initial temperature of the aggregate, °C; Characterized by the temperature of aggregate after mixing, °C; Characterized as the mass of aggregate, kg; Characterized by the emulsion-to-aggregate ratio, %, the mass ratio of emulsified asphalt to aggregate; Characterized by the solid content of emulsified asphalt, % According to the solid content and initial temperature of the emulsified asphalt, the flow rate, temperature, pressure of the asphalt raw material and the flow rate, temperature and pressure of the soap solution in the emulsified asphalt production and storage method are adjusted. At the same time, the temperature and pressure of the emulsified asphalt product storage tank and the transportation conditions are controlled so that the emulsified asphalt that meets the solid content and initial temperature conditions can be added to the mixing bin for mixing.

10. The method for mixing emulsified asphalt and room temperature aggregate according to claim 9, characterized in that: Also includes: A data table of the correspondence between the solid content and the initial temperature of the pre-produced and stored emulsified asphalt, and a ... The emulsified asphalt solid content is traversed from large to small until the emulsified asphalt solid content and initial temperature that satisfy the first preset formula are confirmed.

11. A hot mixing method of the emulsified asphalt and old road pavement material according to claim 4, characterized in that: The following steps are involved: According to the emulsified asphalt and the total aggregate, the heating temperature of the total aggregate is determined according to the second preset formula. The second preset formula includes: in, Characterized by the heating temperature of the total aggregate, °C; Characterized as the mass of the total aggregate to be heated, kg; Characterized by the mass of old asphalt in the old road pavement material, kg; It is represented by the mass of old aggregate in the old road pavement material or the sum of the mass of old aggregate and newly added stone, kg; Characterized as the mass of emulsified asphalt, kg; Characterized by the emulsion-to-stone ratio, %, the mass ratio of emulsified asphalt to total aggregate; Characterized by emulsified asphalt solid content, %; Characterized by the latent heat of vaporization of water at one atmosphere (0.1 MPa) and 100°C, 2257.2 kJ / kg; Characterized as the specific heat capacity of pure asphalt, kJ / kg•℃; Characterized by the initial temperature of the emulsified asphalt, °C; Characterized as the specific heat capacity of the aggregate, kJ / kg•℃; Characterized by the discharge temperature after mixing, ℃, After heating the aggregate according to the determined heating temperature, mix it evenly with emulsified asphalt and regeneration agent.

Images