Cementing oil reducer and application method thereof in asphalt mixture concrete

Abstract

The invention relates to the technical field of asphalt modification application, in particular to a cementing oil reducing agent and an application method thereof in asphalt mixture concrete, and the asphalt mixture cementing oil reducing agent is prepared from the following raw materials in parts by weight: 5-9 parts of waste tire rubber powder, 1-3 parts of surfactant and 4-10 parts of mineral powder. The surfactant is selected from at least one of 2, 4, 7, 9-tetramethyl-5-decyne-4, 7-diol and 2, 5-dimethyl-2, 5-hexanediol, and the surfactant is selected from at least one of 2, 4, 7, 9-tetramethyl-5-decyne-4, 7-diol and 2, 5-dimethyl-2, 5-hexanediol. According to the invention, the waste tire powder is used as a colloid and cracking H oiling reaction source, and is matched with hexanediol or decynol for reaction catalysis, and mineral powder is used as a reaction asphaltene solid particle source, so that the black gray powdery cementing oil reducer is formed; the production process of the traditional asphalt modified mixture / concrete is innovated, subverted and simplified, and the method has revolutionary global popularization significance for overall quality improvement and cost reduction in the asphalt concrete highway industry.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of asphalt modification application, in particular to a kind of asphalt mixture cementing oil reducing agent, and specifically to a kind of cementing oil reducing agent and its application method in asphalt mixture concrete.

[0002] It can be simply summarized as a kind of chemical cementing oil reducing agent suitable for direct mixing various asphalt mixtures, and asphalt mixture, asphalt concrete and application prepared by using the cementing oil reducing agent. BACKGROUND

[0003] Road builders found through the data of different matrix asphalt specific gravity test and road performance comparison that the matrix asphalt with specific gravity greater than 1 is slightly better than the matrix asphalt with specific gravity less than 1 in high temperature resistance, and the greater the difference between the two, the more obvious the difference in high temperature softening point performance, such as coal pitch and rock asphalt concrete, which are obviously higher than petroleum matrix asphalt in anti-rutting ability. It is found through the separation test of various asphalt components that the softening point data of asphaltene component in three components (oil, gum and asphaltene) of asphalt is obviously high, even for the same brand, so that the oil refinery lists the same brand of asphalt as A, B and C grades, A grade is the highest, and C grade is low, and the market price is also sold from high to low.

[0004] What is asphaltene? Asphaltene is one of the natural components of crude oil. Asphaltene is a complex high molecular organic mixture containing a large amount of aromatic compounds and a wide range of distillation fractions, which is composed of several non-volatile compounds of polycyclic aromatic distillate. It determines the viscosity, elasticity and durability of asphalt, and its viscosity decreases with the increase of temperature, which is sensitive to temperature. Asphaltene is a black or brown amorphous solid, and the content of asphaltene in asphalt directly affects the hardness, penetration and softening point of asphalt.

[0005] The main function of aromatic compounds in matrix asphalt is to act as a dispersion medium for gum and asphaltene, which connects asphaltene particles through hydrogen bonds to form a stable colloidal structure.

[0006] In the traditional physical asphalt modification method, too much modifier is mixed into asphalt, which reduces the ductility of asphalt and its prepared asphalt concrete and makes it brittle.

[0007] Asphalt is the binder of aggregate in asphalt concrete. If too little asphalt is used, the mixture will not be well cemented, and if too much asphalt is used, the pavement will be easy to oil and produce rut.

[0008] To solve the above-mentioned asphalt concrete pavement quality problems, successively have China invention patent CN200510022107.7 "a kind of activated rubber powder and its preparation method", CN200510022110.9 "a kind of modified asphalt and its preparation method", CN201010158249.7 "a kind of direct mixing rubber asphalt mixture and its production method" and other authorized invention patents, respectively from material, modified asphalt, modified mixture promote the quality of asphalt mixture used in asphalt concrete, to perfect the above-mentioned problems existing in the existing asphalt concrete pavement.

[0009] But the aforementioned Chinese invention patent CN200510022107.7 "a kind of activated rubber powder and its preparation method" and CN200510022110.9 "a kind of modified asphalt and its preparation method" composition production line. Still can not solve the problem of too long online heating time of matrix asphalt, aromatic, oil, gum components in matrix asphalt are decomposed and evaporated at high temperature. According to statistics, the weight loss of asphalt in the process of wet modification method is about 1% of the total weight of raw material matrix asphalt, and the gasification asphalt gas diffusion pollutes the air around the production line, seriously affecting the health of online workers.

[0010] The entity wet modification plant occupies a wide area, has large fixed asset investment, high energy consumption, large modified asphalt production cost, and poor product market competitiveness. CN201010158249.7 "a kind of direct mixing rubber asphalt mixture and its production method" overcomes the environmental pollution and high production cost defects existing in the above two kinds of wet asphalt modification process, but still cannot solve the problem of asphalt concrete pavement thermal expansion package peeling off due to the increase of aggregate oil film thickness, oil stone ratio and linear expansion amount >1%, and the market promotion acceptance is low.

[0011] The low temperature anti-coagulation performance of gum, the bonding performance of asphaltene and the high temperature resistance of oil in the physical modified asphalt mixture are limited, and the oil stone ratio of ordinary high base asphalt mixture product does not have the best oil stone ratio bonding effect.

[0012] The above description of the prior art is only the personal view of the inventor and does not represent the general technical understanding in the industry. At the same time, the induction of technical problems should not be understood as the whole problem to be solved by the invention, and the technical problem to be solved by the invention should be the specific technical scheme and corresponding technical problem recorded in the invention content. SUMMARY

[0013] The purpose of the present application is to overcome the above-mentioned problems in the production process of asphalt mixture concrete, such as long heating time of asphalt, excessive oxidation, and provide a kind of asphalt mixture cementing oil reducing agent.

[0014] The asphalt mixture cementing oil reducing agent can improve the cementing effect of aggregate for various types of asphalt mixture production, especially for improving the oil resistance of high molecular wet modifier, improving the production efficiency of asphalt mixture concrete, reducing the heating and mixing time, reducing the material aging in the high temperature mixing process of asphalt mixture concrete, and having a very good micro-chemical adhesion prolonging effect on the defects of easy segregation and deterioration during storage.

[0015] The creativity of the present application lies in that the FP cementing oil reducing agent can catalyze the oilization reaction of the material to increase the viscosity during the high temperature oil stone mixing process in the mixing building, effectively reduce the designed oil stone ratio by 20%, thin the oil film of aggregate, reduce the temperature sensitivity, realize the ideal 0.5% of the expansion amount of the paving asphalt concrete pavement, and improve the road performance, prolong the service life of the pavement, and simplify the production process and method of the traditional asphalt modified mixture, which has revolutionary global popularization significance for improving the quality and reducing the cost of the asphalt concrete road industry.

[0016] In order to achieve the above-mentioned application purposes, the present application provides the following products in the first aspect: An asphalt mixture cementing oil reducing agent is prepared from the following raw materials in the following weight ratio: Waste tire rubber powder: surfactant: mineral powder = 5-9: 1-3: 4-10; The surfactant is at least one of 2,4,7,9-tetramethyl-5-decyne-4,7-diol and 2,5-dimethyl-2,5-hexanediol.

[0017] The asphalt mixture cementing oil reducing agent of the present application selects waste tire powder as the gum and the source of cracking H oilization reaction, cooperates with hexanediol (2,5-dimethyl-2,5-hexanediol) or decyne alcohol (2,4,7,9-tetramethyl-5-decyne-4,7-diol) as a reaction catalyst, and cooperates with mineral powder as a source of reaction asphalt solid particles to form a black and gray powdery cementing oil reducing agent. Different arrangement and combination ratio schemes can be formed by adjusting to meet the optimization of cementing oil reducing and viscosity modification of various grades and various types of highway asphalt mixtures, and the improvement of various road performances is better than the current industry standard, which reduces the cost and improves the quality.

[0018] The production of asphalt mixture, especially modified asphalt mixture, using the present application can simplify the modification process, significantly shorten the heating time, reduce the energy consumption of asphalt mixture heating, and reduce the deterioration of asphalt mixture caused by long-term high-temperature oxidation of asphalt. More importantly, the asphalt mixture cementing oil-reducing agent product of the present application can be applied to the production of asphalt mixture in the mixing plant, which can directly reduce the oil content by 20%. Because the asphalt mixture cementing oil-reducing agent of the present application can convert the carbon molecules in the asphalt into the oil required by the asphalt mixture, the light components of the asphalt that are prone to volatilization and loss and cause air pollution are converted into asphalt matrix components that have a significant impact on the quality of the asphalt mixture. This reduces the amount of asphalt used in the production process and produces a mixture product that fully meets the road performance indicators. The product of the present application can be widely used in energy saving, consumption reduction, cost reduction, yield increase, quality improvement, efficiency increase, and technical upgrading of mixing plants for various asphalt products.

[0019] The core of the asphalt mixture cementing oil-reducing agent of the present application is that after the waste tire rubber powder is rearranged by high-temperature catalytic cracking, it reacts with the aromatic, oil, and resin components in the asphalt to complete the conversion of the rubber oil, achieve low-cost high-quality micro-chemical oiling and hydrogenation reaction. The asphalt mixture produced by the asphalt mixture cementing oil-reducing agent effectively reduces the amount of asphaltene used in the base asphalt, resulting in economic benefits. The molecular-level rubber oil composite product makes the oil film around the aggregate thinner, enhances the cementing effect, and improves the road performance, quality, and weathering life of the asphalt concrete.

[0020] Unlike the past asphalt modification methods (physical blending and mixing), the asphalt mixture cementing oil-reducing agent of the present application is not simply a physical swelling or sulfonation or chlorination of asphalt rubber, but a chemical reaction of rubber. The present application uses chemical hydroxyl (OH) to combine high-temperature asphalt cracking carbon with rubber hydrogen to achieve hydrogenation and oiling reaction, so that all components in the asphalt are converted into useful cementing oil phase, reducing the amount of asphalt used and improving the efficiency of asphalt mixture concrete mixing, achieving a leap in asphalt modification technology. The related technology has been successfully verified in multiple engineering projects, which can significantly reduce the amount of base asphalt used in asphalt mixture, does not require long-term heating, and significantly reduces volatile toxic and harmful gases, which has great significance for the production of asphalt concrete.

[0021] Further, the particle size of the waste tire rubber powder is 0.01-0.075mm.

[0022] Further, the mineral powder is at least two of steel slag powder, limestone powder, microsilica powder, slag powder, fly ash, and talc powder.

[0023] Preferably, the mineral powder is a mixed mineral powder, and the mixed mineral powder is alkaline. This is beneficial to ensure adhesion and improve rut resistance, significantly improve road dynamic stability, and have good long-term stability.

[0024] In a second aspect, the present application provides an application method.

[0025] The asphalt mixture cementing oil-reducing agent is applied in the preparation of asphalt concrete modification.

[0026] The asphalt mixture cementing oil-reducing agent is applied in the preparation of asphalt concrete modification.

[0027] In a third aspect, the present application provides an asphalt concrete, which is prepared by using graded aggregate, asphalt and the above-mentioned cementing oil-reducing agent; the weight ratio of various raw material components is as follows: Graded aggregate: asphalt: cementing oil-reducing agent = 93-95:4-6:0.5-2.

[0028] Through experiments, the asphalt concrete prepared by using the above-mentioned cementing oil-reducing agent has good stability, weather resistance and long service life advantages; the specific Marshall test verifies that the high-temperature rutting test is qualified, the low-temperature beam bending test meets the specification requirements, and the water stability test confirms that the asphalt mixture freeze-thaw splitting test meets the specification requirements.

[0029] Further, the weight ratio of various raw material components is as follows: graded aggregate: asphalt: cementing oil-reducing agent = 93-95:4.5-5.5:0.5-1.5.

[0030] Further, the graded aggregate is a graded aggregate meeting the Technical Specification for Construction of Highway Asphalt Pavement (JTG F40-2004); for example, the graded aggregate includes at least one of natural sand, machine-made sand, stone chips, and gravel.

[0031] Further, the petroleum-based asphalt is a product obtained by distillation, oxidation, blending, modification and other processes of crude oil, and is a core binder of the asphalt concrete.

[0032] Preferably, the petroleum-based asphalt is at least one of straight-run asphalt, oxidized asphalt, solvent deasphalted asphalt, blended asphalt, modified asphalt and other asphalt raw materials.

[0033] Preferably, the modified asphalt is modified asphalt. It can be any one or more than one of modified asphalt.

[0034] Compared with the prior art, the present application has the following beneficial effects: 1.The present application provides a bitumen mixture cementation oil-reducing agent, which is obtained by selecting waste tire powder as a gum and cracking H oil reaction source, adjusting different permutation and combination proportion schemes to meet the optimization of cementation, oil reduction, and viscosity modification of various grades and various types of highway bitumen mixtures, and improving various road performances better than the current industry standard, thereby reducing costs and improving quality.

[0035] 2.The bitumen mixture cementation oil-reducing agent product of the present application is applied to bitumen mixture production in a mixing plant, can directly reduce oil by 20%, and can produce a mixture product that fully meets the road performance standard.

[0036] 3.The product of the present application can be widely applied to energy saving, consumption reduction, cost reduction, yield increase, quality improvement, efficiency increase, and technical transformation and upgrading of mixing plants of various bitumen products. DETAILED DESCRIPTION

[0037] The core principle of the bitumen mixture cementation oil-reducing agent of the present application is described in detail below in combination with specific cases. This is a theoretical description of the core innovation point of the present application, which is not a common knowledge of the prior art, but a core mechanism created by the inventor and is the key to guiding the implementation of the present application.

[0038] Further, the particle size of the waste tire rubber powder raw material is 0.01-0.075 mm.

[0039] The waste tire rubber powder with a particle size range of 0.01-0.075 mm can be selected for use.

[0040] Preferably, the waste tire rubber powder is made into a rubber powder by normal temperature crushing, low temperature crushing, wet method or solution method. Preferably, normal temperature vulcanized waste tire rubber powder is used. Preferably, crosslinked vulcanized rubber waste tire rubber powder is used.

[0041] Preferably, the waste tire rubber powder is a rubber powder for asphalt modification.

[0042] Preferably, the bulk density of the waste tire rubber powder is 0.25-0.35 g / cm 3 . Preferably, the bulk density is 0.28-0.32 g / cm 3 .

[0043] Firstly, the structure and principle of the cementation oil-reducing agent involve complex reactions of molecular structure reconstruction of normal temperature vulcanized waste tire rubber powder (mainly crosslinked vulcanized rubber) and base bitumen under high temperature desulfurization and catalytic modification. The main structure of the waste tire powder is crosslinked vulcanized rubber, the skeleton of which is mainly composed of natural rubber (NR), styrene-butadiene rubber (SBR), butadiene rubber (BR), etc., and a large number of C–S–C crosslinked structures are formed after vulcanization.

[0044] As shown in the following molecular formula: … - CH2-CH=CH-CH2-S-S-CH2-CH=CH-CH2-… Under heating condition, the waste tire rubber powder will undergo thermal desulfurization reduction reaction (the hot aggregate temperature of asphalt concrete is as high as 210℃).

[0045] The thermal desulfurization reduction reaction is shown as follows: R-S-S-R' + Heat→ R-SH + R'-SH (or R-H + R'-SH) + S 0 In the waste tire powder, the double sulfur bond and polysulfide bond of vulcanized rubber are broken to form active thiol groups and double bond active hydrocarbon segments.

[0046] Correspondingly, the vulcanized waste tire powder will undergo gelatinization and oil reaction under the action of surfactant. Under the catalysis of surfactant 2,4,7,9-tetramethyl-5-decyne-4,7-diol (TMDD / decynol, C 18 H 36 O2, hexanediol / EG, C8H 18 O2), the carbon-hydrogen free radicals on the desulfurized rubber molecular chain and the carbon molecules and aromatic molecules (such as naphthalene, phenanthrene, benzopyrene, etc.) in asphalt will undergo free radical addition oiling reaction to finally generate a high molecular chain hydrocarbon that can be mutually fused with the asphalt oil portion to rearrange the structure ratio of asphalt colloid and asphaltene, realizing the "gelatinization and oil" process.

[0047] The simplified reaction expression is as follows: Thermal desulfurization reaction (thermal cracking): R-S-S-R + Heat (210℃)→ R• + R• + S 0 Wherein R• is a rubber carbon chain free radical.

[0048] Gelatinization and oil reaction (catalytic combination) R• + Ar-CH=CH2→ R-CH2-CH(Ar) (covalent combination) Or more generally expressed as: C n H 2n -S x + C poly-aromatic (asphalt) + TMDD→ high molecular colloid alkane + S 0 + ΔE (heat) At the asphalt mixture mixing temperature (≥ 210℃), the waste tire powder in the cementation oil reducing agent instantaneously desulfurizes and cracks in the process of direct contact heat exchange with hot aggregates, generates carbon hydrogen free radicals with high reaction adhesion activity, and combines with polycyclic aromatic hydrocarbon structure molecules and carbon molecules in the petroleum-based asphalt under the catalysis of surfactants hexanediol and decyne alcohol, to occur covalent bond connection, so as to realize the molecular level blending modification of the rubber “rubber oil”. This chemical reaction is not simply physical mixing, but is similar to oil hydrogenation synthesis, which constitutes a new generation of environmental protection and low carbon asphalt modification core technology.

[0049] The cementation oil reducing agent of the present application endows the asphalt mixture and the asphalt concrete with new and unique characteristics (after the cementation oil reducing agent of the present application is mixed with the base asphalt and the aggregate, the asphalt mixture is obtained, which is called the asphalt mixture before being rolled and formed, and is called the asphalt concrete after being rolled and paved), can fully convert various cementitious components in the asphalt into the same effect as the asphalt oil, and avoid the decomposition and volatilization loss of the cementitious components under long time high temperature heating, can reduce pollutant emissions, and can convert into oil to improve the quality of the asphalt mixture and the asphalt concrete, so that the quality of the asphalt mixture and the asphalt concrete is greatly improved.

[0050] Further, the mineral powder is at least two of steel slag powder, limestone powder, microsilica powder, slag powder, fly ash and talc powder.

[0051] The mixed mineral powder provides the functions of filling and increasing strength, and the mixed mineral powder provides filling and skeleton structure in the cementation oil reducing agent, and regulates the powder fluidity of the asphalt mixture cementation oil reducing agent.

[0052] Preparation Example 1 Oil reducing agent preparation: The cementation oil reducing agent is prepared by mixing the following raw materials in parts by weight (1 kilogram per part): waste tire rubber powder 8 parts, 2,4,7,9-tetramethyl-5-decyn-4,7-diol 2 parts, and mineral powder 7 parts. The FP oil reducing agent (FarPath Ltd. oil reducing agent) is obtained.

[0053] After the cost of raw materials is calculated, the cost of the obtained cementation oil reducing agent is about 5.2 yuan / kg.

[0054] The asphalt mixture cementation oil reducing agent product of the present application is applied to the production and preparation of asphalt concrete, and the obtained asphalt concrete has excellent performance, and the production process conforms to the relevant regulations at home and abroad.

[0055] Including but not limited to the following regulations: 1) “Highway Asphalt Pavement Construction Technical Specification” JTGF40-2004.

[0056] 2) Highway Engineering Asphalt and Asphalt Mixture Test Standard JTGE20-2011.

[0057] 3) Volatile Organic Compounds Unorganized Emission Control Standard GB37822.

[0058] 4) Asphalt Industry Pollutant Emission Standard GB16297.

[0059] 5) Industrial Furnace Atmospheric Pollutant Emission Standard GB9078.

[0060] 6) American Clean Air Act (CAA).

[0061] 7) European Union Industrial Emission Order (IED2010 / 75 / EU).

[0062] And the asphalt mixture cementing oil reducing agent product of the application has low cost and great potential for popularization and application. The cementing oil reducing agent of the application is cost-accounted, and the specific calculation table is shown below.

[0063] Table 1: Production raw material cost list of mixture

[0064] Note: Users can flexibly adjust the mixing ratio of the cementing oil reducing agent in the mixture according to the design road performance index of the asphalt concrete to achieve the purpose of enhancing the cementing effect of each type of mixture.

[0065] Through calculation, it can be known that the asphalt cementing oil reducing agent of the application has very low cost, has significant advantages compared to other asphalt concrete modification schemes of the prior art, and can be widely popularized and applied.

[0066] The reason is mainly that the method of the application realizes the effect of converting gum into asphalt base oil required for asphalt concrete production, and realizes the oilization and hydrogenation synthesis of light components and gum hydrocarbon components in base asphalt through a small amount of cementing oil reducing agent catalytic reaction, converts them into high-quality high-viscosity asphalt wrapping material components, realizes high-quality wrapping of the aggregate surface area in the asphalt mixture, improves the rutting resistance, high-temperature softening point and segregation resistance of the asphalt mixture rolled into asphalt concrete, releases less harmful volatile components during production, and basically all of them are converted into key asphalt gum components that improve the quality of asphalt concrete.

[0067] The application will be further described in detail below in combination with the application of the cementing oil reducing agent of the application in asphalt mixture production. However, this should not be understood as limiting the scope of the above-mentioned subject matter of the application to the following examples. Any arrangement, combination, formula technology product production and improvement application based on the content of the application all belong to the scope of the application.

[0068] In order to better illustrate the application effect of the cementing oil reducing agent, the asphalt mixture is prepared according to the embodiments for testing and analysis, so as to better represent the advantages of the cementing oil reducing agent formula of the asphalt concrete.

[0069] Example 1 The straight-dosed asphalt mixture is prepared according to the following method:

[0070] The straight-dosed asphalt mixture of the embodiment is prepared according to the following method: (1) The cementing oil reducing agent is loaded into the mixing building powder bin for standby use.

[0071] (2) The asphalt mixture is prepared: the graded aggregate is heated to 210-220 DEG C in the mixing bin, the petroleum-based asphalt is heated to 150-160 DEG C, and the cementing oil reducing agent is added into the mixing cylinder at the same time as the hot aggregate according to the weight ratio of graded aggregate: asphalt: cementing oil reducing agent = 93: 5.5: 1.5, and the mixture is pre-mixed for 7-10 seconds and then the petroleum-based asphalt is sprayed and wet-mixed for 35-45 seconds (adjusting according to the temperature of the aggregate), so as to complete the production process of the enhanced cementing asphalt mixture of the cementing oil reducing agent, the mixture is controlled to be discharged at a temperature of 180-200 DEG C (determined according to the climate condition and transportation distance), and the enhanced cementing asphalt mixture is obtained.

[0072] Example 2 The straight-dosed asphalt mixture is prepared according to the following method: The straight-dosed asphalt mixture is prepared according to the following method:

[0073] The straight-dosed asphalt mixture of the embodiment is prepared according to the following method: (1) The cementing oil reducing agent is loaded into the mixing building powder bin for standby use. (2) The asphalt mixture is prepared: the graded aggregate is heated to 210-220 DEG C in the mixing bin, the petroleum-based asphalt is heated to 150-160 DEG C, and the cementing oil reducing agent is added into the mixing cylinder at the same time as the hot aggregate according to the weight ratio of graded aggregate: asphalt: cementing oil reducing agent = 93: 5.5: 1.5, and the mixture is pre-mixed for 7-10 seconds and then the petroleum-based asphalt is sprayed and wet-mixed for 35-45 seconds (adjusting according to the temperature of the aggregate), so as to complete the production process of the enhanced cementing asphalt mixture of the cementing oil reducing agent, the mixture is controlled to be discharged at a temperature of 180-200 DEG C (determined according to the climate condition and transportation distance), and the enhanced cementing asphalt mixture is obtained.

[0074] Example 3 The direct mixing asphalt mixture of this embodiment is AC16 intermediate layer mixture, which meets the requirements of "Technical Specification for Construction of Highway Asphalt Pavement" and is configured according to the following weight ratio of components: aggregate: petroleum base asphalt: cementing oil reducing agent = 95:4:1.

[0075] The direct mixing asphalt mixture of this embodiment is prepared according to the following method: (1) The cementing oil reducing agent is loaded into the mixing building powder bin for standby use. (2) Preparation of asphalt mixture: The graded aggregate is heated to 210-220°C in the mixing bin, the petroleum base asphalt is heated to 150-160°C, and the cementing oil reducing agent is added into the mixing cylinder at the same time as the hot aggregate for pre-mixing for 7-10 seconds according to the weight ratio of graded aggregate: asphalt: cementing oil reducing agent = 94:4.5:0.5, and then the petroleum base asphalt is sprayed for wet mixing for 35-45 seconds (adjusting according to the pre-mixing aggregate temperature) to complete the production process of the enhanced cementing asphalt mixture of the cementing oil, and the mixture discharge temperature is controlled to be 180-200°C (determined according to the climate conditions and transportation distance), thereby obtaining the enhanced cementing asphalt mixture.

[0076] Example 4 The direct mixing asphalt mixture is AC20 middle and lower layer mixture of highway with medium-grained gradation, which meets the requirements of "Technical Specification for Construction of Highway Asphalt Pavement" and is configured according to the following weight ratio of components:

[0077] The direct mixing asphalt mixture of this embodiment is prepared according to the following method: (1) The cementing oil reducing agent is loaded into the mixing building powder bin for standby use.

[0078] (2) Preparation of asphalt mixture: The graded aggregate is heated to 210-220°C in the mixing bin, the petroleum base asphalt is heated to 150-160°C, and the cementing oil reducing agent is added into the mixing cylinder at the same time as the hot aggregate for pre-mixing for 7-10 seconds according to the weight ratio of graded aggregate: asphalt: cementing oil reducing agent = 95:4:1, and then the petroleum base asphalt is sprayed for wet mixing for 35-45 seconds (adjusting according to the pre-mixing aggregate temperature) to complete the production process of the enhanced cementing asphalt mixture of the cementing oil, and the mixture discharge temperature is controlled to be 180-200°C (determined according to the climate conditions and transportation distance), thereby obtaining the enhanced cementing asphalt mixture.

[0079] Example 5 The direct mixing asphalt mixture is AC25 coarse-grained middle and lower layer first-class road layer mixture, which meets the requirements of "Technical Specification for Construction of Highway Asphalt Pavement" and is configured according to the following weight ratio of components: aggregate: petroleum base asphalt: cementing oil reducing agent = 95.5:3.5:1.

[0080] The hot mix asphalt mixture of the present embodiment is prepared by the following method: (1) The cementing oil reducing agent is loaded into the mixing building powder bin for standby; (2) Preparation of asphalt mixture: the graded aggregate is heated to 210-220°C in the mixing bin, the petroleum-based asphalt is heated to 150-160°C, and the cementing oil reducing agent is added into the mixing cylinder with the hot aggregate at the same time for pre-mixing for 7-10 seconds with the dry and wet degree of the aggregate adjusted, and then the petroleum-based asphalt is sprayed for wet mixing for 35-45 seconds (adjusted according to the pre-mixing aggregate temperature), so as to complete the production process of the enhanced cementing asphalt mixture of the cementing oil reducing agent, and the mixture discharge temperature is controlled to be 180-200°C (determined according to the climate condition and transportation distance), so as to obtain the enhanced cementing asphalt mixture.

[0081] Example 6 The hot mix asphalt mixture listed in the present embodiment is AC30 special coarse type bottom middle layer mixture, which meets the requirements of the Technical Specification for Construction of Highway Asphalt Pavement, and is configured by the following components in weight ratio: Aggregate: petroleum-based asphalt: cementing oil reducing agent = 96:3:1.

[0082] The hot mix asphalt mixture of the present embodiment is prepared by the following method: (1) The cementing oil reducing agent is loaded into the mixing building powder bin for standby: (2) Preparation of asphalt mixture: the graded aggregate is heated to 210-220°C in the mixing bin, the petroleum-based asphalt is heated to 150-160°C, and the cementing oil reducing agent is added into the mixing cylinder with the hot aggregate at the same time for pre-mixing for 7-10 seconds with the dry and wet degree of the aggregate adjusted, and then the petroleum-based asphalt is sprayed for wet mixing for 35-45 seconds (adjusted according to the pre-mixing aggregate temperature), so as to complete the production process of the enhanced cementing asphalt mixture of the cementing oil reducing agent, and the mixture discharge temperature is controlled to be 180-200°C (determined according to the climate condition and transportation distance), so as to obtain the enhanced cementing asphalt mixture.

[0083] The asphalt concrete prepared in the foregoing examples 1 to 6 is subjected to performance test. The quality of the hot mix asphalt mixture of each example is evaluated by using Marshall test method and road performance index.

[0084] (A) Marshall test: (table dry method T0705-2000) (B) High temperature rutting test High temperature rutting test was carried out according to the rutting test method of asphalt mixture in Highway Engineering Asphalt and Asphalt Mixture Test Regulation (JTGE20-2011), and the related technical requirements in the current Highway Asphalt Pavement Construction Technical Specification (JTGF40-2004) were evaluated.

[0085] (C) Low temperature beam bending test Low temperature beam bending test was carried out according to the beam bending test standard (JTGE20-2011) of asphalt mixture in Highway Engineering Asphalt and Asphalt Mixture Test Regulation (JTGE20-2011), and the related technical requirements in the current Highway Asphalt Pavement Construction Technical Specification (JTGF40-2004) were evaluated.

[0086] (D) Water stability test The test was carried out according to the freeze-thaw splitting test condition of asphalt mixture in Highway Engineering Asphalt and Asphalt Mixture Test Regulation (JTGE20-2011), the material was prepared at 0.98 times of the density of Marshall test piece under the optimum oil-stone ratio, the "static pressure method" was used to form φ10×10cm cylindrical test piece to ensure the same compaction degree as the field.

[0087] The test results of the directly mixed asphalt mixture prepared in the above six examples are shown in Tables 2 to 5.

[0088] Table 2, Marshall test results

[0089] Table 3, rutting test dynamic stability index test results

[0090] Table 4, bending failure strain index test results

[0091] Table 5, freeze-thaw splitting test results

[0092] It can be seen from the above examples and test results that the asphalt mixture cementing oil reducing agent of the present application has excellent comprehensive performance of asphalt concrete, meets the requirements of many domestic and foreign relevant regulations. The asphalt mixture cementing oil reducing agent of the present application has low comprehensive cost, solves the problems of asphalt decomposition and degradation and release of harmful gases in the asphalt mixture mixing process compared with the prior art, directly reduces oil by 20%, reduces cost and improves quality, and meets the specification requirements of various grades and various types of highway asphalt mixture.

[0093] As can be seen from the above embodiments, the present invention achieves the organic synergy of waste tire rubber powder and base asphalt. The obtained binder oil-reducing agent can play a highly efficient oil-reducing role in the production and use of direct-mix asphalt binder, and ultimately achieves cost reduction, quality improvement and efficiency enhancement in asphalt mixture production.

[0094] Examples 7-10 Cementing oil-reducing agent Oil-reducing agents of various specifications are prepared by mixing the raw materials in the weight parts (1 kg per part) shown in the table below.

[0095] Table 6. Raw material ratio of cementitious oil-reducing agent

[0096] Cementitious oil-reducing agents can be prepared through various mixing ratios. The raw material ratio should be controlled as follows: waste tire rubber powder: surfactant: mineral powder = 5-9:1-3:4-10. This effectively converts various cementitious components in asphalt into asphalt oil, enhancing the oil's effectiveness, preventing the loss of cementitious components due to prolonged high-temperature heating and decomposition, reducing pollutant emissions, and significantly improving the quality of asphalt mixtures and asphalt concrete.

[0097] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0098] Unless otherwise specified, the use of terms such as "first," "later," "again," "simultaneously," "middle," "lower," "outer," "enter," and "enhance" in the description of specific embodiments of the present invention to indicate directional, temporal, or positional relationships is based on the relationship of the technological process or is a term commonly used in the industry. These industry terms describing directional aspects are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, and for enabling those skilled in the art to quickly understand the solution. They do not indicate or imply that a particular device / component / element must have a specific orientation or be constructed and operated in a specific positional relationship, and therefore should not be construed as limiting the present invention.

[0099] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0100] In addition, in the description of the technical scheme of the present application, unless otherwise explicitly specified / limited / limited, the terms "asphalt", "aggregate", "oil reducing agent", "cement", "modification", "paving", "blending", "mixing" should be understood broadly, for example, it can be petroleum asphalt, or natural asphalt, or coal tar pitch, it can be base asphalt or modified asphalt, etc. Common jargon in the art, for example, black material, mixture, cement, aggregate, stone, cement, adhesive, asphalt oil, mineral powder, stone powder should be understood as a comprehensive understanding without regional fusion.

Claims

1. An asphalt mix cementing oil reducing agent characterized by, The raw materials are prepared in the following proportions by weight: Waste tire rubber powder: surfactant: mineral powder = 5-9: 1-3: 4-10; The surfactant is at least one of 2,4,7,9-tetramethyl-5-decyn-4,7-diol and 2,5-dimethyl-2,5-hexanediol.

2. The asphalt binder cementing oil reducing agent of claim 1, wherein, The particle size of the waste tire rubber powder is 0.01-0.075mm.

3. The asphalt binder cementing oil reducing agent of claim 1, wherein, The mineral powder is at least two of steel slag powder, limestone powder, microsilica powder, slag powder, fly ash, and talc powder.

4. The asphalt binder cementing oil reducing agent of claim 3, wherein, The mixed mineral powder is alkaline.

5. Use of the asphalt mixture cementing oil-reducing agent according to any one of claims 1-4 in the preparation of asphalt concrete.

6. An asphalt concrete, characterized by, The asphalt concrete is prepared using graded aggregate, asphalt, and the asphalt mixture cementing oil-reducing agent according to any one of claims 1-4; the proportions by weight of the various raw material components are as follows: Graded aggregate: asphalt: cementing oil-reducing agent = 93-95: 4-6: 0.5-2.

7. An asphalt concrete according to claim 6, characterised in that The proportions by weight of the various raw material components are as follows: graded aggregate: asphalt: cementing oil-reducing agent = 93-95: 4.5-5.5: 0.5-1.

5.

8. The asphalt concrete of claim 6, wherein The graded aggregate is in accordance with the Technical Specification for Construction of Highway Asphalt Pavement (JTGF40-2004).

9. The asphalt concrete of claim 6, wherein, The asphalt is petroleum-based asphalt; the petroleum-based asphalt is obtained through distillation, oxidation, blending, and modification processes of crude oil.

10. The asphalt concrete of claim 6, wherein, The asphalt is at least one of straight-run asphalt, oxidized asphalt, blended asphalt, and modified asphalt.

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