Bio-based solvent type asphalt cold patch liquid, cold patch material and preparation method of bio-based solvent type asphalt cold patch liquid and cold patch material

Abstract

The invention discloses a bio-based solvent type asphalt cold supplementing liquid, the raw materials of the cold supplementing liquid comprise petroleum asphalt, a diluent, a tackifying modifier and a bio-based underwater adhesive, and the bio-based underwater adhesive is one or a mixture of more than two of barnacle gum, mussel secreted adhesive protein and polyphenylene catechol ethylene; the cold patch material has very good binding power, can quickly form relatively high initial strength, has excellent water stability and strong water damage resistance, can complete crosslinking and effective adhesion under a water condition, and can establish functions of interface contact, molecular adsorption between various substrates and the like in the process, so that the cold patch material can be normally constructed under the condition that a pit slot has water; the system is not limited by environmental conditions and has higher instantaneity, so that the system is used for all-season all-weather construction and long-term storage; the concrete has the advantages of simple preparation process, excellent construction workability and initial stability, can be easily mixed and paved manually by using a shovel when being used for cold patch of asphalt mixtures, and has high initial strength and forming strength after pit slot repair.

Description

Technical Field

[0001] The invention relates to an emergency repair material for road potholes, and in particular to a bio-based solvent-type asphalt cold patching liquid, a cold patching material and a preparation method thereof. Background Art

[0002] Road potholes refer to potholes caused by the partial detachment of road aggregates under the action of driving. They are common diseases that are prone to occur frequently on asphalt pavements, affecting driving safety, comfort, and road appearance. If maintenance and repair are not timely, it will pose a great threat to driving safety and increase maintenance costs. Hot-mix asphalt mixtures are usually used to repair potholes. Their construction technology is relatively mature, but the production and construction of hot-mix asphalt mixtures require high temperatures and are easily restricted by climatic conditions. There are problems such as high energy consumption, serious environmental pollution, and difficulty in construction in rainy and snowy weather. At the same time, the single production volume of hot-mix asphalt mixtures is large, while the repair area of ​​most potholes is small and the locations are relatively scattered, so it is easy to cause waste of surplus materials. In addition, hot-mix asphalt mixtures will segregate during transportation due to the difficulty in maintaining stable temperature, resulting in the inability to ensure compaction, thereby affecting the repair effect. Therefore, in order to meet the needs of timely repair of potholes and convenient construction of personnel, cold-patch asphalt mixtures came into being. First, cold patch asphalt mixture can be mixed and stored in advance, and can be "taken as needed", without causing waste of residual materials, and can adapt to the problem of scattered repair sites; secondly, cold patch asphalt mixture does not need to be heated when used, and can be constructed at room temperature or low temperature, and is less affected by climatic conditions; thirdly, the construction process of cold patch asphalt mixture is simple, which can effectively save labor resources and costs. Cold patch asphalt mixture can be divided into emulsified type, reactive type and solvent type according to the different asphalt binders. Asphalt cold patch material is made by mixing aggregates with asphalt cold patch liquid. Asphalt cold patch liquid is a composite material. The base asphalt, modifier and various additives are sheared and developed in proportion and stirred evenly in the asphalt modification equipment to prepare "asphalt cold patch liquid", and then the asphalt cold patch liquid is mixed with aggregates in a similar way to the traditional hot mix asphalt mixture mixing process, and the finished material is bagged and stored. Cold patch material is suitable for construction conditions such as road pothole repair and road emergency repair, and it is open to traffic immediately after construction. The strength formation of cold patch material is a slow process. Under the action of driving and air, part of the diluent in the cold patch material evaporates. After about three months, its deformation and strength will gradually stabilize, reaching or exceeding the performance of the hot asphalt mixture after cooling. Although the performance of the existing public cold patch material can meet the relevant application requirements, the solvent-based cold patch material products on the market currently use traditional petrochemical solvents such as diesel. Due to the high boiling point of the solvent and slow volatilization, there are generally problems such as low initial strength, poor adhesion, poor water stability, and the contradiction between workability and initial strength. It cannot fully meet the current demand for road maintenance materials.

[0003] Therefore, it is necessary to solve the technical problems of slow solvent evaporation and low initial strength of cold patch materials for potholes, as well as poor adhesion, poor water stability, and the contradiction between workability and initial strength. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a bio-based solvent-based asphalt cold patch fluid, cold patch material and a preparation method thereof, so as to solve the technical problems of slow evaporation of solvent of pothole cold patch material, low initial strength, poor adhesion, poor water stability, and the contradiction between workability and initial strength.

[0005] The bio-based solvent-based asphalt cold patching fluid of the present invention, the raw materials of the cold patching fluid include petroleum asphalt, a diluent, a viscosity-increasing modifier and a bio-based underwater adhesive, and the bio-based underwater adhesive is one or a mixture of two or more of barnacle glue, mussel secretion adhesive protein and polyphenylene catechol;

[0006] Further, by weight, petroleum asphalt 70-80 parts, diluent 20-30 parts, viscosity modifier 2.1-4.8 parts, bio-based underwater adhesive 0.35-0.64 parts;

[0007] Further, the diluent is at least one of a low-boiling halogenated hydrocarbon solvent, a mixed hydrocarbon substance consisting of aromatic hydrocarbons and alkanes in the range of C5-C22;

[0008] Furthermore, the viscosity-increasing modifier is at least one of SBS (styrene-butadiene-styrene block copolymer), SEBS (styrene-ethylene-butylene-styrene block copolymer), and SIS (styrene-isoprene-styrene block copolymer).

[0009] The present invention discloses a method for preparing a bio-based solvent-based asphalt cold make-up fluid, comprising the following steps:

[0010] S1, dissolving the viscosity-enhancing modifier and the bio-based underwater adhesive in a diluent to prepare a mixed solution, which is sealed and stored for later use;

[0011] S2, dissolving petroleum asphalt in a diluent and then adding the mixture in step S1 and stirring to obtain a viscous liquid asphalt cold replenishment solution;

[0012] Furthermore, in step S2, the petroleum asphalt is heated to a semi-fluid state and then a diluent is added to dissolve it.

[0013] The present invention also discloses an asphalt cold patch material, which comprises aggregate and the above-mentioned bio-based solvent-type asphalt cold patch liquid, wherein, by mass percentage, aggregate: asphalt cold patch liquid = 100: 3.9-4.5;

[0014] Furthermore, the aggregate is a mixture of one or more of diabase, limestone, basalt and granite.

[0015] The invention also discloses a method for preparing asphalt cold patch material, comprising the following steps: mechanically mixing bio-based solvent-type asphalt cold patch liquid and aggregate at room temperature.

[0016] The beneficial effects of the present invention are as follows: the bio-based solvent-type asphalt cold patching fluid, cold patch material and preparation method thereof of the present invention utilize low-boiling halogenated hydrocarbon solvents to accelerate the volatilization of the diluent, so that the cold patch material can quickly form a relatively high initial strength; at the same time, the viscosity-increasing modifier improves the bonding force between the asphalt and the aggregate in the cold patch material; the bio-based underwater adhesive imparts the cold patch material with excellent water stability and strong resistance to water damage; the bio-based underwater adhesive in water conditions can undergo cross-linking and effective adhesion, establish interfacial contact and molecular adsorption with various substrates and other functions, thereby enabling the cold patch material to be normally constructed when there is water in the pit, without being restricted by environmental conditions, so that the cold patch maintenance has stronger immediacy, and can thus be used for all-season, all-weather construction and long-term storage; the construction workability and initial stability are excellent, and the cold patch asphalt mixture prepared by the cold patching fluid can be easily mixed and paved by hand with a shovel during application, can meet the requirements of workability, and has high initial strength and molding strength after the pit is repaired. DETAILED DESCRIPTION

[0017] For a better understanding of the present invention, the following examples are provided to further illustrate the present invention, but the present invention is not limited to the following examples.

[0018] In the examples, the experimental methods used are conventional methods unless otherwise specified, and the materials, reagents, etc. used are all commercially available unless otherwise specified.

[0019] The bio-based solvent-based asphalt cold patching fluid of this embodiment, the raw materials of the cold patching fluid include petroleum asphalt, diluent, viscosity-increasing modifier and bio-based underwater adhesive, the bio-based underwater adhesive is one or a mixture of two or more of barnacle glue, mussel secretion adhesive protein, polyphenyl catechol ethylene; the bio-based underwater adhesive is a bio-based new material, so that the asphalt material can complete cross-linking and effective adhesion under water conditions, and the process can establish functions such as interface contact and molecular adsorption between various substrates, so that the cold patch material can be normally constructed when there is water in the pit, without being restricted by environmental conditions, so that the cold patch maintenance has stronger immediacy, so that it can be used for all-season all-weather construction and long-term storage. Among them, barnacle glue: Mrcp-100k and Mrcp-52k can be separated from barnacle adhesives. These two proteins are mainly polymerized by disulfide bonds and hydrophobic interactions, making the primary glue difficult to dissolve. The cross-linking, assembly and effective adhesion of barnacle glue underwater must complete the functions of gelation, transfer of water molecules on the surface of the substrate, establishment of interface contact and molecular adsorption between various substrates. Barnacle glue is insoluble in salt, dilute acid, dilute alkali and other solutions, so it is extremely viscous after curing and is very difficult to dissolve. It can withstand the action of all hydrolases. Mussel secretion adhesive protein: Mussels and other shellfish can secrete highly viscous proteins. Their low molecular weight and functional properties mean that they can greatly improve the performance of existing adhesives. As a viscosity-enhancing admixture, it is very environmentally friendly. The protein secreted by mussels is rich in the amino acid L-Dopa, which makes it sticky and repairable after being added to the adhesive. This property relies on a hydrogen-bonded complex called catechol. The proteins in the mussel adhesive system are post-translationally modified to produce catechol side chains. These 3,4-dihydroxyphenylalanine (DOPA) residues are cross-linked through several types of chemical reactions and bonds.

[0020] In this embodiment, by weight, there are 70-80 parts of road petroleum asphalt, 20-30 parts of diluent, 2.1-4.8 parts of viscosity modifier, and 0.35-0.64 parts of bio-based underwater adhesive; the diluent is at least one of a low-boiling halogenated hydrocarbon solvent, a mixed hydrocarbon substance composed of aromatic hydrocarbons and alkanes in the range of C5-C22; dichloromethane is an organic compound with a chemical formula of CH2Cl2, a colorless transparent liquid, and a pungent odor similar to ether. Its boiling point is 39.8°C. It is a non-flammable low-boiling volatile organic solvent under normal conditions of use and has good compatibility with asphalt. The asphalt diluent is prepared by mixing dichloromethane with a mixed hydrocarbon solvent composed of aromatic hydrocarbons and alkanes in the range of C5-C22 in a certain mass ratio to obtain an organic solvent combination with good volatility, which can more efficiently volatilize the diluent component to increase the viscosity of the asphalt and enhance the bonding force. It is compounded with the viscosity modifier and the bio-based underwater adhesive to prepare the cold patching fluid, so that the cold patch material can quickly form a higher initial strength. The viscosity modifier can improve the adhesion and reinforcement effect of asphalt due to its plasticity, and improve the high temperature performance of the product, preferably at least one of SBS, SEBS and SIS. The road petroleum asphalt is one or two of 70# road petroleum asphalt and 90# road petroleum asphalt.

[0021] The viscosity-increasing modifier is at least one of SBS, SEBS, and SIS; SBS is a styrene-butadiene-styrene block copolymer, a thermoplastic elastomer modifier, the world's largest thermoplastic elastomer with the most similar properties to rubber. SBS can absorb non-polar substances such as aromatic components and saturated components in asphalt cold patching fluid, and convert them into polar substances such as colloids and asphaltene. SEBS is a linear triblock copolymer with polystyrene as the terminal segment and ethylene-butene copolymer obtained by hydrogenating polybutadiene as the middle elastic block; SIS is a sister product of thermoplastic elastomer SBS, which is formed by the copolymerization of styrene-isoprene-styrene triblocks. Compared with SBS, SIS has better cohesion and excellent adhesion properties and better compatibility with other additives. At the same time, SIS solution viscosity and melt viscosity are small, and SIS processing performance is better than SBS.

[0022] The method for preparing the bio-based solvent-based asphalt cold make-up fluid of this embodiment comprises the following steps:

[0023] S1, dissolving the viscosity-enhancing modifier and the bio-based underwater adhesive in a diluent to prepare a mixed solution, which is sealed and stored for later use;

[0024] S2, dissolving the road petroleum asphalt in a diluent and then adding the mixed solution in step S1 to stir, so as to obtain a viscous liquid asphalt cold replenishment solution; in step S2, heating the road petroleum asphalt to a semi-fluid state and then adding the diluent to dissolve. The production process is simple, the equipment requirements are low, and the material cost is low.

[0025] This embodiment also discloses an asphalt cold patch material, which includes aggregate and the above-mentioned bio-based solvent-based asphalt cold patch liquid, in which the ratio of aggregate to asphalt cold patch liquid is 100:3.9-4.5 by mass percentage; the aggregate is a mixture of one or more of diabase, limestone, basalt, and granite, and the prepared cold patch liquid has good adhesion and water-stripping resistance with the aggregate. The gradation of the aggregate is LB-13 / AC-13, and it is dried in an oven at 105°C for 3-4 hours before use and then air-dried for standby use.

[0026] The invention also discloses a method for preparing asphalt cold patch material, comprising the following steps: mechanically mixing bio-based solvent type asphalt cold patch liquid with aggregate at room temperature. The production process is simple, the equipment requirements are low, and the material cost is low.

[0027] Embodiment 1

[0028] The cold repair liquid of this embodiment includes: 156g 70# road petroleum asphalt, 20.1g dichloromethane, 26.7g xylene, 20.1g kerosene, 4.68g SBS, and no bio-based underwater adhesive is added.

[0029] The preparation method of the cold patching liquid is as follows: SBS is added to a dichloromethane solvent at room temperature and stirred to dissolve to prepare a dichloromethane mixed solution, which is sealed and stored; asphalt is heated to a semi-fluid state; kerosene and xylene are added to the asphalt in turn, and the asphalt is dissolved by stirring with a glass rod; a dichloromethane mixed solution is added to the asphalt mixed solution to further stir and dilute the asphalt; after dilution at room temperature, it is stirred at 500 r / min for 20 minutes to obtain a uniform viscous liquid asphalt mixture, which is the asphalt cold patching liquid described in the present invention; the prepared cold patching liquid is put into a container, which is sealed and stored at room temperature to prepare a cold patching liquid reference sample.

[0030] The preparation method of cold patch material is as follows: 3900g of LB-13 diabase aggregate with a good proportion is first stirred in a mixer for 120s, 227.6g of the prepared cold patch liquid is poured into a mixing pot and mixed with the aggregate at room temperature for 60s, then 100g of 42.5R grade cement is poured into the mixing pot and mixed with the mixture at room temperature for 60s to obtain a reference sample of cold patch asphalt mixture.

[0031] Embodiment 2

[0032] The cold repair liquid of this embodiment: 156g70# road petroleum asphalt, 23.4g dichloromethane, 23.4g xylene, 20.1g kerosene, 4.68g SEBS, 0.78g barnacle glue.

[0033] The preparation method of the cold patching liquid is as follows: SEBS and barnacle glue are added to a dichloromethane solvent at room temperature and stirred to dissolve to prepare a mixed solution, which is sealed and stored; asphalt is heated to a semi-fluid state; kerosene and xylene are added to the asphalt in turn, and the asphalt is dissolved by stirring with a glass rod; a dichloromethane mixture is added to the asphalt mixture to further stir and dilute the asphalt; after being basically diluted at room temperature, the mixture is stirred at 500 r / min for 20 minutes to obtain a uniform viscous liquid asphalt mixture, which is the asphalt cold patching liquid described in the present invention; the prepared cold patching liquid is put into a container, which is sealed and stored at room temperature.

[0034] The preparation method of cold patch material is as follows: 3900g of LB-13 diabase aggregate with a good proportion is first stirred in a mixer for 120s, 228.4g of the prepared cold patch liquid is poured into a mixing pot and mechanically mixed with the aggregate at room temperature for 60s, and then 100g of 42.5R grade cement is poured into the mixing pot and mechanically mixed with the mixture at room temperature for 60s to obtain a bio-based solvent-based cold patch asphalt mixture.

[0035] Embodiment 3

[0036] The cold repair solution of this embodiment: 168g 70# road petroleum asphalt, 25.2g dichloromethane, 25.2g xylene, 21.6g kerosene, 6.72g SIS, 1.008g mussel secretion adhesion protein.

[0037] The preparation method of the cold patching liquid is as follows: SIS and adhesion protein are added to a dichloromethane solvent at room temperature for stirring and dissolving to prepare a mixed solution, which is sealed and stored; asphalt is heated to a semi-fluid state; kerosene and xylene are added to the asphalt in turn, and the asphalt is dissolved by stirring with a glass rod; a dichloromethane mixture is added to the asphalt mixture to further stir and dilute the asphalt; after being basically diluted at room temperature, the mixture is stirred at 500 r / min for 20 minutes to obtain a uniform viscous liquid asphalt mixture, which is the asphalt cold patching liquid described in the present invention; and the prepared cold patching liquid is put into a container, which is sealed and stored at room temperature.

[0038] The preparation method of cold patch material is as follows: 3875g of AC-13 limestone aggregate with a good proportion is first stirred in a mixer for 120s, 247.7g of the prepared cold patch liquid is poured into a mixing pot and mechanically mixed with the aggregate at room temperature for 60s, then 100g of 42.5R grade cement is poured into the mixing pot and mechanically mixed with the mixture at room temperature for 60s to obtain a bio-based solvent-based cold patch asphalt mixture.

[0039] Embodiment 4

[0040] The cold make-up liquid of this embodiment: 180g70# road petroleum asphalt, 27g dichloromethane, 27g xylene, 23.1g kerosene, 5.4g SBS, 0.9g polyphenyl catechol ethylene.

[0041] The preparation method of the cold patching liquid is as follows: SBS and polyphenylene catechol ethylene are added to a dichloromethane solvent at room temperature for stirring and dissolving to prepare a mixed solution, which is sealed and stored; asphalt is heated to a semi-fluid state; kerosene and xylene are added to the asphalt in turn, and the asphalt is dissolved by stirring with a glass rod; a dichloromethane mixture is added to the asphalt mixture for further stirring and diluting the asphalt; after being basically diluted at room temperature, the mixture is stirred at 500 r / min for 20 minutes to obtain a uniform viscous liquid asphalt mixture, which is the asphalt cold patching liquid described in the present invention; the prepared cold patching liquid is put into a container, which is sealed and stored at room temperature.

[0042] The preparation method of cold patch material is as follows: 4020g of AC-13 basalt aggregate (excluding filler) with a good proportion is first stirred in a mixer for 120s, 263.4g of the cold patch liquid prepared above is poured into a mixing pot and mechanically mixed with the aggregate at room temperature for 60s, and then 100g of 42.5R grade cement is poured into the mixing pot and mechanically mixed with the mixture at room temperature for 60s to obtain a bio-based solvent-based cold patch asphalt mixture.

[0043] Embodiment 5

[0044] The cold repair liquid of this embodiment: 100g70# road petroleum asphalt, 80g90# road petroleum asphalt, 27g dichloromethane, 27g xylene, 23.1g kerosene, 5.4g SBS, 1.44g barnacle glue.

[0045] The preparation method of the cold patching liquid is as follows: SBS and polyphenylene catechol ethylene are added to a dichloromethane solvent at room temperature for stirring and dissolving to prepare a mixed solution, which is sealed and stored; asphalt is heated to a semi-fluid state; kerosene and xylene are added to the asphalt in turn, and the asphalt is dissolved by stirring with a glass rod; a dichloromethane mixture is added to the asphalt mixture for further stirring and diluting the asphalt; after being basically diluted at room temperature, the mixture is stirred at 500 r / min for 20 minutes to obtain a uniform viscous liquid asphalt mixture, which is the asphalt cold patching liquid described in the present invention; the prepared cold patching liquid is put into a container, which is sealed and stored at room temperature.

[0046] The preparation method of cold patch material is as follows: 4010g of AC-13 limestone-basalt mixed aggregate (excluding filler) is first mixed with stone in a mixer for 120s, 263.9g of the prepared cold patch liquid is poured into a mixing pot and mixed with the aggregate at room temperature for 60s, then 100g of 42.5R grade cement is poured into the mixing pot and mixed with the mixture at room temperature for 60s to obtain a bio-based solvent-based cold patch asphalt mixture.

[0047] Embodiment 6

[0048] The cold make-up liquid of this embodiment: 180g 90# road petroleum asphalt, 27g methylene chloride, 27g xylene, 23.1g kerosene, 5.4g SBS, 1.08g polyphenylene catechol ethylene.

[0049] The preparation method of the cold patching liquid is as follows: SBS and polyphenylene catechol ethylene are added to a dichloromethane solvent at room temperature for stirring and dissolving to prepare a mixed solution, which is sealed and stored; asphalt is heated to a semi-fluid state; kerosene and xylene are added to the asphalt in turn, and the asphalt is dissolved by stirring with a glass rod; a dichloromethane mixture is added to the asphalt mixture for further stirring and diluting the asphalt; after being basically diluted at room temperature, the mixture is stirred at 500 r / min for 20 minutes to obtain a uniform viscous liquid asphalt mixture, which is the asphalt cold patching liquid described in the present invention; the prepared cold patching liquid is put into a container, which is sealed and stored at room temperature.

[0050] The preparation method of cold patch material is as follows: 3890g of LB-13 limestone-diabase mixed aggregate (excluding filler) with a good proportion is first stirred in a mixer for 120s, 263.6g of the prepared cold patch liquid is poured into a mixing pot and mechanically mixed with the aggregate at room temperature for 60s, and then 100g of mineral powder is poured into the mixing pot and mechanically mixed with the mixture at room temperature for 60s to obtain a bio-based solvent-based cold patch asphalt mixture.

[0051] Compared with the prior art, the present invention has the following advantages:

[0052] (1) Good bonding performance. According to "Water-based Asphalt Waterproof Coating for Road and Bridge" (JT / T 535-2015), the pull-out strength of the asphalt cold patching liquid was tested by the adhesion pull-out test to examine the bonding performance of the asphalt cold patching liquid. The asphalt cold patching liquid in the embodiment was applied to the surface of the concrete block, and the coating amount was 0.2kg / m 2 , placed at room temperature 20±2℃, relative humidity 60%±15%, after the diluent is completely volatilized, use epoxy as adhesive to bond the ingot, place at room temperature for 24h, and use XH-3000N pulling strength tester to test.

[0053] The detection indicators of the asphalt cold make-up fluid in the above embodiment are shown in Table 1.

[0054] Table 1 Volatility and bonding performance indicators of bio-based solvent-based asphalt cold patching fluid

[0055]

[0056] Note: 1. The volatility test is to detect the mass loss rate of asphalt cold patch fluid in three days, so as to assist in evaluating the speed at which the product cold patch material reaches the initial strength.

[0057] 2. According to "Water-based Asphalt-based Waterproof Coatings for Roads and Bridges" (JT / T 535-2015), a portable adhesion pull-out test is used to test the pull-out strength of the asphalt cold repair fluid and examine the bonding performance of the asphalt cold repair fluid.

[0058] Compared with Example 1, Examples 2 to 6 have a higher mass proportion of low-boiling methane dioxide, a higher mass loss rate, and better volatility, which is beneficial to promoting the formation of bonding strength. At the same time, the addition of bio-based underwater adhesives improves the pull-out strength, and all are above 1.2 MPa. The bio-based solvent-based asphalt cold patching fluid has good bonding properties.

[0059] (2) Excellent construction workability and initial stability. The initial strength and molding strength of the bio-based solvent-based cold patch asphalt mixture were tested according to the "Test Code for Asphalt and Asphalt Mixture" (JTGE20-2011). The results are shown in Table 2.

[0060] Table 2 Test indicators of bio-based solvent-based cold patch asphalt mixture

[0061]

[0062] Note: 3. Initial strength: Combined with the Marshall test method for cold-patch asphalt mixture in the Technical Specifications for Highway Asphalt Pavement Construction (JTG F40-2004), in order to simulate the strength in a short period of time after actual construction, 1180g of the mixture was weighed and loaded into a test mold at room temperature. Both sides were compacted 50 times. After curing to constant weight at room temperature, both sides were compacted 25 times. After demolding, the Marshall test was carried out directly.

[0063] 4. Forming strength: Combined with the Marshall test method for cold-patch asphalt mixture in the "Technical Specifications for Highway Asphalt Pavement Construction" (JTG F40-2004), in order to simulate the strength of the compacted and dense state after the actual construction under the load of a moving vehicle, 1180g of the mixture was weighed and loaded into a test mold at room temperature, compacted 50 times on both sides, and placed in a 110℃ oven together with the test mold in an upright position for 24 hours. After taking out, compacted 25 times on both sides, and then placed upright at room temperature together with the test mold for 24 hours. After demolding, it was cured in a 60℃ constant temperature water tank for 30 minutes, and then the Marshall test was carried out.

[0064] 5. Water stability: Combined with Note 3, the test conditions of curing in a 60℃ constant temperature water bath for 30 minutes after demoulding are increased to curing in a 60℃ constant temperature water bath for 48 hours, and the other test conditions remain unchanged.

[0065] 6. Cohesion test: According to the relevant experimental methods for cold patch asphalt in JTG F40-2004 "Technical Specifications for Highway Asphalt Pavement Construction", 800g of cold patch material is loaded into the Marshall test mold and placed in a constant temperature chamber at 4℃ for 2-3h. After taking it out, compact it 5 times on both sides to make the test piece. After demoulding, put it on the standard sieve, stand it upright and roll the test piece back and forth along the sieve frame 20 times. The specification stipulates that the breakage rate of cold patch material is ≤40%.

[0066] When the bio-based solvent-based cold patch asphalt mixture is used, it can be easily mixed and paved by hand with a shovel, which can meet the requirements of workability, and the initial strength and molding strength after pothole repair are high.

[0067] (3) Excellent water stability. The weak point of cold patch material performance is its ability to resist water damage. The residual stability is used as an evaluation index of water stability. After the cold patch material specimens are placed in an oven for curing, the water bath temperature is set to 60°C. The ratio of the stability MS1 of a group of specimens after 48 hours of water bath to the stability MS of a group of specimens after 30 minutes of water bath is used as an evaluation index of its water stability. The residual stability MS0 is calculated according to the following formula, and the results are shown in Table 2.

[0068] MS0=MS1 / MS*100 Formula (1)

[0069] Where: MS0——Residual stability of the specimen after immersion in water, %;

[0070] MS1——Stability of the specimen after 48h in 60℃ water bath, kN;

[0071] MS——Stability of the specimen after 30 minutes in a 60℃ water bath, kN.

[0072] The residual stability of bio-based solvent-based cold patch asphalt mixture is higher than that of the reference sample. The bio-based underwater adhesive plays an effective cross-linking and adhesion role. The bio-based solvent-based cold patch asphalt mixture has excellent water stability.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A bio-based solvent-based asphalt cold make-up fluid, characterized by: The raw materials of the cold replenishment fluid include petroleum asphalt, a diluent, a viscosity-increasing modifier and a bio-based underwater adhesive. The bio-based underwater adhesive is one or a mixture of two or more of barnacle glue, mussel secretion adhesive protein and polycatechol ethylene.

2. The bio-based solvent-based asphalt cold make-up fluid according to claim 1, characterized in that: By weight, petroleum asphalt 70-80 parts, diluent 20-30 parts, viscosity modifier 2.1-4.8 parts, bio-based underwater adhesive 0.35-0.64 parts.

3. The bio-based solvent-based asphalt cold make-up fluid according to claim 1, characterized in that: The diluent is at least one of a low-boiling halogenated hydrocarbon solvent, a mixed hydrocarbon substance consisting of aromatic hydrocarbons and alkanes in the range of C5-C22.

4. The bio-based solvent-based asphalt cold make-up fluid according to claim 1, characterized in that: The viscosity-increasing modifier is at least one of SBS, SEBS and SIS.

5. The method for preparing the bio-based solvent-based asphalt cold make-up fluid according to claim 1, characterized in that: The following steps are involved: S1, dissolving the viscosity-enhancing modifier and the bio-based underwater adhesive in a diluent to prepare a mixed solution, which is sealed and stored for later use; S2, dissolving petroleum asphalt in a diluent and then adding the mixture in step S1 and stirring to obtain a viscous liquid asphalt cold repair solution.

6. The method for preparing the bio-based solvent-based asphalt cold make-up fluid according to claim 5, characterized in that: In step S2, the petroleum asphalt is heated to a semi-fluid state and then a diluent is added to dissolve it.

7. An asphalt cold patch material, characterized in that: The asphalt cold patch material comprises aggregate and the bio-based solvent-based asphalt cold patch liquid according to claim 1, and in terms of mass percentage, the aggregate: asphalt cold patch liquid = 100: 3.9-4.

5.

8. The asphalt cold patch material according to claim 7, characterized in that: The aggregate is one or a mixture of diabase, limestone, basalt and granite.

9. The method for preparing the asphalt cold patch material according to claim 7, characterized in that: The following steps are involved: The bio-based solvent-based asphalt cold patch fluid is mechanically mixed with aggregate at room temperature.

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