Emulsified asphalt cold-mixed and cold-paved asphalt pavement material as well as preparation method and application thereof

Abstract

The invention provides an emulsified asphalt cold-mixing and cold-paving type asphalt pavement material as well as a preparation method and application thereof, and belongs to the technical field of cement-based modified asphalt pavement materials. The material is a composition product comprising an AC-20SBS modified emulsified asphalt cold-mixed and cold-laid asphalt mixture and an AC-25 common emulsified asphalt cold-mixed and cold-laid asphalt mixture. The material can effectively replace a hot mixing type asphalt pavement material; the material has the same asphalt pavement material performance, and the dynamic stability of the material can reach 10500 times. Mm <-1 > and is far beyond the technical requirements; the overall performance is excellent, and the comprehensive durability of the pavement material in the whole life cycle is realized. The preparation method is simple and easy to operate, and heating and mixing treatment is not needed; the preparation cost is low, clean production is realized, and the method is suitable for large-area popularization. The material is applied to a surface layer structure of an asphalt pavement as a middle-lower surface layer structure, and has relatively high pavement wear resistance.

Description

Technical Field

[0001] The present invention belongs to the technical field of cement-based modified asphalt pavement materials, and in particular relates to an emulsified asphalt cold-mix cold-paved asphalt pavement material, a preparation method and an application thereof. Background Art

[0002] Existing asphalt pavement materials are primarily hot-mix asphalt mixtures, and the finished mixing temperature must be controlled between 160°C and 180°C. The production process primarily utilizes fossil fuels such as light oil, heavy oil, or natural gas for heating and burning, generating large amounts of dust, CO2, asphalt fumes, and harmful gases. This not only consumes significant amounts of non-renewable fossil energy and pollutes the air, but also increases the production cost of the mixture. Furthermore, the high-temperature mixing, transportation, and construction processes of the asphalt mixture can cause a certain degree of asphalt aging. This significantly degrades the performance of the asphalt pavement before it is even opened to traffic, reducing its durability.

[0003] In view of this, it is necessary to provide an emulsified asphalt cold mix cold paving asphalt pavement material, a preparation method and its application to solve the problems of existing asphalt pavement materials such as air pollution, high construction cost and poor pavement performance. Summary of the Invention

[0004] The main purpose of the present invention is to provide an emulsified asphalt cold mix and cold paving asphalt pavement material, a preparation method and its application, aiming to solve the problems of existing asphalt pavement materials such as air pollution, high construction cost and poor pavement performance.

[0005] To achieve the above-mentioned object, the present invention provides an emulsified asphalt cold-mix cold-paved asphalt pavement material, wherein the emulsified asphalt cold-mix cold-paved asphalt pavement material comprises a first surface layer material and a second surface layer material.

[0006] The first surface layer material is AC-20SBS modified emulsified asphalt cold mix and cold paving asphalt mixture; the AC-20SBS modified emulsified asphalt cold mix and cold paving asphalt mixture includes: in parts by mass, 50-70 parts of first coarse aggregate, 25-45 parts of fine aggregate, 6.5-8.0 parts of mixing type SBS modified emulsified asphalt, 2-5 parts of water, 1-3 parts of cement and 1-5 parts of mineral powder.

[0007] The second surface layer material is AC-25 ordinary emulsified asphalt cold mix cold paving asphalt mixture; the AC-25 ordinary emulsified asphalt cold mix cold paving asphalt mixture includes: in parts by mass, 55 to 75 parts of second coarse aggregate, 20 to 40 parts of fine aggregate, 6.0 to 7.5 parts of slow-cracking emulsified asphalt, 1 to 4 parts of water, 1 to 3 parts of cement and 1 to 5 parts of mineral powder.

[0008] The mixing type SBS modified emulsified asphalt and the slow-cracking mixing type emulsified asphalt both include a slow-cracking mixing type emulsifier; the slow-cracking mixing type emulsifier is a lignin-based cationic slow-cracking mixing type emulsifier; the slow-cracking mixing type emulsifier includes, by mass percentage, ≥20% of the first composition and ≥15% of the second composition.

[0009] The first composition comprises at least two of tallow alkylpropylene diamine, hexadecyltrimethylammonium chloride, C16-C18 alkyl polyamine, distearyldimethylammonium chloride and alkylphenol polyoxyethylene ether.

[0010] The second composition includes at least two of cocamidopropylamine, lauryl polyoxyethylene ether, cocamidopropyl betaine and acrylamide.

[0011] Furthermore, the first coarse aggregate is limestone crushed stone; the specifications of the limestone crushed stone include two grades: 10~20mm and 5~10mm.

[0012] The second coarse aggregate is limestone material; the specifications of the limestone material include three grades: 20~30mm, 10~20mm and 5~10mm.

[0013] The fine aggregate is limestone chips; the specifications of the limestone chips include 0-5 mm.

[0014] Furthermore, the mixing type SBS modified emulsified asphalt includes: by mass, 60-65 parts of SBS modified asphalt, 1.5-2.5 parts of mixing type SBS modified emulsifier, 0.5-1.5 parts of the slow-cracking mixing type emulsifier, 30-38 parts of water and 0.1-0.5 parts of stabilizer.

[0015] Furthermore, the slow-cracking mixing type emulsified asphalt includes: by mass, 60 to 65 parts of base asphalt, 2.2 to 3.2 parts of the slow-cracking mixing type emulsifier, 30 to 38 parts of water and 0.1 to 0.5 parts of stabilizer.

[0016] Furthermore, the stabilizer includes one or more of ammonium chloride, potassium chloride, sodium chloride, polyvinyl alcohol, and polyacrylamide.

[0017] Furthermore, the cement is silicate retarded cement.

[0018] Furthermore, the mineral powder is limestone fine powder; the specification of the limestone fine powder is 0.075mm, and the 0.075mm sieve pass rate of the limestone fine powder is >75%.

[0019] The present invention also provides a method for preparing the emulsified asphalt cold mix and cold paving type asphalt pavement material as described in any one of the above items, respectively providing a mixing type SBS modified emulsified asphalt and a slow-cracking mixing type emulsified asphalt.

[0020] AC-20SBS modified emulsified asphalt cold mix and cold paving asphalt mixture is obtained by mixing 50-70 parts of first coarse aggregate, 25-45 parts of fine aggregate, 6.5-8.0 parts of the mixing type SBS modified emulsified asphalt, 2-5 parts of water, 1-3 parts of cement and 1-5 parts of mineral powder, calculated by mass.

[0021] AC-25 ordinary emulsified asphalt cold mix and cold laying asphalt mixture is obtained by mixing 55-75 parts of the second coarse aggregate, 20-40 parts of the fine aggregate, 6.0-7.5 parts of slow-cracking emulsified asphalt, 1-4 parts of water, 1-3 parts of cement and 1-5 parts of mineral powder, calculated by mass.

[0022] The mixing type SBS modified emulsified asphalt is obtained by mixing 60-65 parts of SBS modified asphalt, 1.5-2.5 parts of mixing type SBS modified emulsifier, 0.5-1.5 parts of slow-cracking mixing type emulsifier, 30-38 parts of water and 0.1-0.5 parts of stabilizer, calculated by mass.

[0023] The slow-cracking mixing type emulsified asphalt is obtained by mixing 60-65 parts of base asphalt, 2.2-3.2 parts of the slow-cracking mixing type emulsifier, 30-38 parts of water and 0.1-0.5 parts of the stabilizer, in parts by mass.

[0024] The slow-cracking mixing emulsifier is a lignin-based cationic slow-cracking mixing emulsifier; the slow-cracking mixing emulsifier includes, by mass, a first composition ≥20% and a second composition ≥15%; the first composition includes at least two of tallow alkyl propylene diamine, hexadecyl trimethyl ammonium chloride, C16-C18 alkyl polyamine, distearyl dimethyl ammonium chloride and alkylphenol polyoxyethylene ether; the second composition includes at least two of cocamidopropyl amine, lauryl alcohol polyoxyethylene ether, cocamidopropyl betaine and acrylamide.

[0025] The present invention also provides an application of the emulsified asphalt cold-mix, cold-laid asphalt pavement material as described in any one of the above items or the emulsified asphalt cold-mix, cold-laid asphalt pavement material prepared by the above preparation method in an asphalt pavement surface layer structure, wherein the AC-25 ordinary emulsified asphalt cold-mix, cold-laid asphalt mixture in the emulsified asphalt cold-mix, cold-laid asphalt pavement material as described in any one of the above items or the emulsified asphalt cold-mix, cold-laid asphalt pavement material prepared by the above preparation method is used as a raw material to be laid as the lower layer structure of the asphalt pavement surface layer structure.

[0026] The middle surface layer structure of the asphalt pavement surface layer structure is paved with AC-20SBS modified emulsified asphalt cold mix cold paving asphalt mixture in the emulsified asphalt cold mix cold paving type asphalt pavement material as raw material.

[0027] The upper layer structure of the asphalt pavement surface structure is paved with SMA-13 ​​asphalt mixture as raw material.

[0028] The thicknesses of the upper layer structure, the middle layer structure and the lower layer structure are 3-5 cm, 6-10 cm and 8-12 cm respectively.

[0029] Compared with the prior art, the present invention has at least the following advantages: The emulsified asphalt cold-mix, cold-laid asphalt pavement material provided by the present invention is a composite product comprising an AC-20SBS modified emulsified asphalt cold-mix, cold-laid asphalt mixture as the first surface layer material and an AC-25 conventional emulsified asphalt cold-mix, cold-laid asphalt mixture as the second surface layer material. This emulsified asphalt cold-mix, cold-laid asphalt pavement material can effectively replace corresponding hot-mix asphalt pavement materials and has equivalent asphalt pavement material performance. Specifically, its dynamic stability can reach 10,500 times / mm, provided that the Marshall stability, residual stability, and freeze-thaw splitting strength ratio all remain consistently above the technical requirements. -1 , far exceeding the technical requirements (≥1000 times·mm -1 ); The overall performance is excellent, achieving the comprehensive durability of the pavement material throughout its life cycle.

[0030] The preparation method of the emulsified asphalt cold-mix cold-paved asphalt pavement material provided by the present invention is simple and easy to operate, and does not require heating and mixing treatment; the preparation cost is low, clean production is achieved, and it is suitable for large-scale promotion.

[0031] The emulsified asphalt cold-mix cold-laid asphalt pavement material provided by the present invention is applied to the asphalt pavement surface layer structure, and can be used as the middle and lower layer structure, combined with the SMA-13 ​​asphalt mixture to construct an upper, middle and lower three-layer surface layer structure; it can effectively replace the lower layer and middle layer hot-mix asphalt mixture widely used in the pavement surface layer structure, and the formed asphalt pavement surface layer structure has strong pavement damage resistance; and make positive contributions to the carbon peak and carbon neutrality goals. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0033] Figure 1 A schematic diagram of the asphalt pavement surface structure provided by the present invention; Figure 2 : is a gradation curve diagram of the AC-20SBS modified emulsified asphalt cold mix cold paving asphalt mixture in Example 2 of the present invention; Figure 3 This is a gradation curve diagram of AC-25 common emulsified asphalt cold mix and cold paving asphalt mixture in Example 2 of the present invention.

[0034] The realization of the objectives, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0036] Moreover, the technical solutions between the various embodiments of the present invention may be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] When numerical ranges are given in the examples, it should be understood that unless otherwise specified herein, both endpoints of each numerical range and any value between the two endpoints may be used. Unless otherwise defined, all technical and scientific terms used herein are consistent with the prior art as understood by those skilled in the art and the description of the present invention. Any prior art methods, devices, and materials similar or equivalent to those described in the examples of the present invention may also be used to implement the present invention.

[0038] In order to solve the problems of air pollution, high construction cost, poor pavement performance and so on in existing asphalt pavement materials, the present invention provides an emulsified asphalt cold mix and cold paving asphalt pavement material, which includes a first surface layer material and a second surface layer material.

[0039] The first surface layer material is an AC-20SBS modified emulsified asphalt cold mix, cold paving asphalt mixture. This mixture comprises, by weight, 50-70 parts first coarse aggregate, 25-45 parts fine aggregate, 6.5-8.0 parts mixing-type SBS modified emulsified asphalt, 2-5 parts water, 1-3 parts cement, and 1-5 parts mineral powder. Specifically, experimental research has shown that only when the components meet the aforementioned mass ratios can the AC-20SBS modified emulsified asphalt cold mix, cold paving asphalt mixture be within the gradation range required by the specification and ensure that its performance meets the specification performance indicators. It should be noted that the "AC-20" in the AC-20SBS modified emulsified asphalt cold mix, cold paving asphalt mixture refers to a continuous asphalt mixture with a nominal maximum particle size of 19 mm.

[0040] The second surface layer material is an AC-25 common emulsified asphalt cold mix, cold paving asphalt mixture. This mixture includes, by weight, 55-75 parts of second coarse aggregate, 20-40 parts of fine aggregate, 6.0-7.5 parts of slow-cracking emulsified asphalt, 1-4 parts of water, 1-3 parts of cement, and 1-5 parts of mineral powder. Specifically, experimental research has shown that only when the components meet the aforementioned mass ratios can the AC-25 common emulsified asphalt cold mix, cold paving asphalt mixture be within the gradation range required by the specification and ensure that its performance meets the specification performance indicators. It should be noted that the "AC-25" in the AC-25 common emulsified asphalt cold mix, cold paving asphalt mixture refers to a continuous asphalt mixture with a nominal maximum particle size of 26.5 mm.

[0041] Furthermore, the first coarse aggregate is limestone crushed stone; the limestone crushed stone has two sizes: 10-20mm and 5-10mm. Specifically, using limestone crushed stone with two sizes: 10-20mm and 5-10mm as the first coarse aggregate in the AC-20SBS modified emulsified asphalt cold mix cold paving asphalt mixture ensures that the gradation of the AC-20SBS modified emulsified asphalt cold mix cold paving asphalt mixture has a nominal maximum particle size of 19mm, and can provide the required skeleton structure of the AC-20SBS modified emulsified asphalt cold mix cold paving asphalt mixture.

[0042] The second coarse aggregate is limestone, available in three sizes: 20-30mm, 10-20mm, and 5-10mm. Specifically, using limestone in AC-25 cold-mix, cold-paved emulsified asphalt mixtures with sizes of 20-30mm, 10-20mm, and 5-10mm ensures a maximum nominal particle size of 26.5mm and provides a stable skeletal structure.

[0043] The fine aggregate is limestone chips, available in sizes ranging from 0 to 5 mm. Specifically, limestone chips with sizes ranging from 0 to 5 mm can be combined with the asphalt components in the AC-20SBS modified emulsified asphalt cold mix, cold paving asphalt mixture or the AC-25 conventional emulsified asphalt cold mix, cold paving asphalt mixture to form an asphalt mortar, fully filling the voids in the mixture's skeleton, increasing the adhesion between the asphalt and the aggregate, and ensuring the compactness of the AC-20SBS modified emulsified asphalt cold mix, cold paving asphalt mixture or the AC-25 conventional emulsified asphalt cold mix, cold paving asphalt mixture.

[0044] The emulsified asphalt cold-mix, cold-laid asphalt pavement material provided by the present invention is a composite product comprising an AC-20SBS modified emulsified asphalt cold-mix, cold-laid asphalt mixture as the first surface layer material and an AC-25 conventional emulsified asphalt cold-mix, cold-laid asphalt mixture as the second surface layer material. This emulsified asphalt cold-mix, cold-laid asphalt pavement material can effectively replace corresponding hot-mix asphalt pavement materials and has equivalent asphalt pavement material performance. Specifically, its dynamic stability can reach 10,500 times / mm, provided that the Marshall stability, residual stability, and freeze-thaw splitting strength ratio all remain consistently above the technical requirements. -1 , far exceeding the technical requirements (≥1000 times·mm -1 ); The overall performance is excellent, achieving the comprehensive durability of the pavement material throughout its life cycle.

[0045] Furthermore, the mixing-type SBS modified emulsified asphalt comprises, by weight, 60-65 parts of SBS modified asphalt, 1.5-2.5 parts of a mixing-type SBS modified emulsifier, 0.5-1.5 parts of a slow-cracking mixing-type emulsifier, 30-38 parts of water, and 0.1-0.5 parts of a stabilizer. Specifically, the mixing-type SBS modified emulsified asphalt prepared using this gradation method has viscosity, evaporation residue penetration and ductility, and storage stability that meet regulatory requirements. Preferably, the mixing-type SBS modified emulsifier used is a slow-cracking mixing-type SBS modified emulsifier produced by Tianjin Kangzewei Technology Co., Ltd.

[0046] Furthermore, the slow-cracking mixing emulsified asphalt comprises, by weight, 60-65 parts of base asphalt, 2.2-3.2 parts of a slow-cracking mixing emulsifier, 30-38 parts of water, and 0.1-0.5 parts of a stabilizer. Specifically, the slow-cracking mixing emulsified asphalt prepared using this gradation meets regulatory requirements for viscosity, evaporation residue penetration and ductility, and storage stability.

[0047] Furthermore, the slow-cracking mixing emulsifier is a lignin-based cationic slow-cracking mixing emulsifier; the slow-cracking mixing emulsifier includes, by weight, a first composition ≥ 20% and a second composition ≥ 15%. Specifically, ≥ 20% of the first composition in the slow-cracking mixing emulsifier can exert excellent emulsification ability and effectively emulsify the base asphalt; ≥ 15% of the second composition can reduce interfacial tension, facilitating emulsification, dispersion, and stabilization; the two work together to stably formulate a slow-cracking mixing emulsified asphalt with excellent performance. Preferably, the first composition accounts for 20-60% by weight; the remainder is the second composition.

[0048] The first composition includes at least two of tallow alkyl propylene diamine, hexadecyl trimethyl ammonium chloride, C16-C18 alkyl polyamine, distearyl dimethyl ammonium chloride and alkylphenol polyoxyethylene ether.

[0049] The second composition includes at least two of cocamidopropylamine, lauryl polyoxyethylene ether, cocamidopropyl betaine, and acrylamide.

[0050] Furthermore, the stabilizer includes one or more of ammonium chloride, potassium chloride, sodium chloride, polyvinyl alcohol, and polyacrylamide.

[0051] Furthermore, the cement is silicate retarding cement. Specifically, silicate retarding cement can increase the early strength of AC-20SBS modified emulsified asphalt cold mix cold paving asphalt mixture or AC-25 ordinary emulsified asphalt cold mix cold paving asphalt mixture and shorten the curing time of the specimen.

[0052] Furthermore, the mineral powder is limestone fine powder; the specification of the limestone fine powder is 0.075mm, and the pass rate of the limestone fine powder on a 0.075mm sieve is greater than 75%. Specifically, the mineral powder of this specification can effectively improve the adhesion of mixing type SBS modified emulsified asphalt or slow-cracking mixing type emulsified asphalt to aggregate.

[0053] The present invention also provides a method for preparing any of the above emulsified asphalt cold mix and cold paving asphalt pavement materials, respectively providing a mixing type SBS modified emulsified asphalt and a slow-cracking mixing type emulsified asphalt.

[0054] AC-20SBS modified emulsified asphalt cold mix and cold paving asphalt mixture is obtained by mixing 50-70 parts of first coarse aggregate, 25-45 parts of fine aggregate, 6.5-8.0 parts of mixing type SBS modified emulsified asphalt, 2-5 parts of water, 1-3 parts of cement and 1-5 parts of mineral powder, calculated by mass.

[0055] AC-25 ordinary emulsified asphalt cold mix and cold laying asphalt mixture is obtained by mixing 55-75 parts of second coarse aggregate, 20-40 parts of fine aggregate, 6.0-7.5 parts of slow-cracking emulsified asphalt, 1-4 parts of water, 1-3 parts of cement and 1-5 parts of mineral powder, calculated by mass.

[0056] The mixing type SBS modified emulsified asphalt is obtained by mixing 60-65 parts of SBS modified asphalt, 1.5-2.5 parts of mixing type SBS modified emulsifier, 0.5-1.5 parts of slow-cracking mixing type emulsifier, 30-38 parts of water and 0.1-0.5 parts of stabilizer, calculated by mass.

[0057] The slow-cracking mixing type emulsified asphalt is obtained by mixing 60-65 parts of base asphalt, 2.2-3.2 parts of slow-cracking mixing type emulsifier, 30-38 parts of water and 0.1-0.5 parts of stabilizer, calculated by mass.

[0058] The slow-cracking mixing emulsifier is a lignin-based cationic slow-cracking mixing emulsifier; the slow-cracking mixing emulsifier includes, by mass, a first composition ≥20% and a second composition ≥15%; the first composition includes at least two of tallow alkyl propylene diamine, hexadecyl trimethyl ammonium chloride, C16-C18 alkyl polyamine, distearyl dimethyl ammonium chloride and alkylphenol polyoxyethylene ether; the second composition includes at least two of cocamidopropyl amine, lauryl alcohol polyoxyethylene ether, cocamidopropyl betaine and acrylamide.

[0059] Preferably, the total duration of the mixing process is 100-200 seconds. Specifically, in an optional embodiment, the mixing process is performed by first mixing the coarse aggregate, part of the water, and part of the emulsified asphalt in a mixing kettle for 60 seconds; then adding the pre-wetted fine aggregate and the remaining emulsified asphalt and mixing for 60 seconds; and finally adding the cement and mineral powder and mixing for 60 seconds; wherein the emulsified asphalt is a mixing-type SBS modified emulsified asphalt or a slow-cracking mixing-type emulsified asphalt.

[0060] The preparation method of the emulsified asphalt cold-mix cold-paved asphalt pavement material provided by the present invention is simple and easy to operate, and does not require heating and mixing treatment; the preparation cost is low, clean production is achieved, and it is suitable for large-scale promotion.

[0061] The present invention also provides an application of any one of the above emulsified asphalt cold mix cold paving asphalt pavement materials or the emulsified asphalt cold mix cold paving asphalt pavement materials prepared by the above preparation method in an asphalt pavement surface layer structure. Figure 1 The lower layer structure 3 of the asphalt pavement surface structure is paved with the AC-25 common emulsified asphalt cold mix cold paving asphalt mixture in any of the above emulsified asphalt cold mix cold paving asphalt pavement materials or the emulsified asphalt cold mix cold paving asphalt pavement materials prepared by the above preparation method as raw material.

[0062] The middle surface layer structure 2 of the asphalt pavement surface layer structure is paved with AC-20SBS modified emulsified asphalt cold mix cold paving asphalt mixture in the emulsified asphalt cold mix cold paving type asphalt pavement material as raw material.

[0063] The upper layer structure 1 of the asphalt pavement surface structure is paved with SMA-13 ​​asphalt mixture as raw material. It should be noted that "SMA-13" in SMA-13 ​​asphalt mixture means a crushed stone mastic asphalt mixture with a nominal maximum particle size of 13 mm.

[0064] The thicknesses of the upper layer structure 1, the middle layer structure 2 and the lower layer structure 3 are 3-5 cm, 6-10 cm and 8-12 cm respectively.

[0065] The emulsified asphalt cold-mix cold-laid asphalt pavement material provided by the present invention is applied to the asphalt pavement surface layer structure, and can be used as the middle and lower layer structure, combined with the SMA-13 ​​asphalt mixture to construct an upper, middle and lower three-layer surface layer structure; it can effectively replace the lower layer and middle layer hot-mix asphalt mixture widely used in the pavement surface layer structure, and the formed asphalt pavement surface layer structure has strong pavement damage resistance; and make positive contributions to the carbon peak and carbon neutrality goals.

[0066] The following are specific examples of the present invention: Example 1 (1) Preparation of mixing type SBS modified emulsified asphalt 63 parts of SBS modified asphalt, 2 parts of mixing type SBS modified emulsifier (slow-cracking mixing type SBS modified emulsifier produced by Tianjin Kangzewei Technology Co., Ltd.), 1 part of slow-cracking mixing type emulsifier (45% of a first composition composed of tallow alkyl propylene diamine and hexadecyl trimethyl ammonium chloride + 55% of a second composition composed of cocamidopropylamine, lauryl polyoxyethylene ether and cocamidopropyl betaine), 33.7 parts of water and 0.3 parts of sodium chloride were mixed for 60 seconds to obtain mixing type SBS modified emulsified asphalt.

[0067] (2) Preparation of slow-cracking mixing emulsified asphalt 63 parts of base asphalt, 2.5 parts of slow-cracking mixing emulsifier (30% of a first composition composed of distearyl dimethyl ammonium chloride and alkylphenol polyoxyethylene ether + 70% of a second composition composed of cocamidopropyl betaine and acrylamide), 34.2 parts of water and XX parts of ammonium chloride are mixed for 60 seconds to obtain slow-cracking mixing emulsified asphalt.

[0068] Example 2 Preparation of emulsified asphalt cold mix cold paving asphalt pavement material (preparing the first surface layer material and the second surface layer material separately and combining them) (1) Preparation of AC-20SBS modified emulsified asphalt cold mix cold paving asphalt mixture Provide 63 parts of first coarse aggregate (limestone crushed stones with specifications of 0-20 mm and 5-10 mm), 34 parts of fine aggregate (limestone chips with specifications of 0-5 mm), 7.2 parts of mixing type SBS modified emulsified asphalt (mixing type SBS modified emulsified asphalt prepared by Example 1-(1); solid content 4.3 parts), 3 parts of water, 1.5 parts of cement (Silicate retarded cement) and 3 parts of mineral powder (limestone fine powder with specifications of 0.075 mm and 0.075 mm sieve pass rate> 75%); obtain a synthetic gradation curve based on 63 parts of first coarse aggregate, 34 parts of fine aggregate and 3 parts of mineral powder, and draw the corresponding gradation curve, as shown in FIG. Figure 2 As shown. Figure 2 It can be seen that the composite gradation curve is between the upper limit curve and the lower limit curve of the gradation curve diagram, which meets the gradation requirements.

[0069] Coarse aggregate, part of water and part of mixing type SBS modified emulsified asphalt were first mixed in a mixing pot for 60 seconds; then pre-wetted fine aggregate and the remaining mixing type SBS modified emulsified asphalt were added and mixed for 60 seconds; finally, cement and mineral powder were added and mixed for 60 seconds to obtain AC-20SBS modified emulsified asphalt cold mix cold paving asphalt mixture, which was then used to form Marshall specimens and rutting specimens, and the performance test results were recorded. The test items were marked as Example 2-(1).

[0070] (2) Preparation of AC-25 common emulsified asphalt cold mix cold paving asphalt mixture Provide 68 parts of second coarse aggregate (limestone materials with specifications of 20-30 mm, 10-20 mm and 5-10 mm), 30 parts of fine aggregate (limestone chips with specifications of 0-5 mm), 6.2 parts of slow-cracking mixing emulsified asphalt (slow-cracking mixing emulsified asphalt prepared by Example 1-(2); solid content 4.0 parts), 2 parts of water, 1.5 parts of cement (Silicate retarded cement) and 2 parts of mineral powder (limestone fine powder with specifications of 0.075 mm and 0.075 mm sieve pass rate> 75%); obtain a synthetic gradation curve based on 68 parts of second coarse aggregate, 30 parts of fine aggregate and 2 parts of mineral powder, and draw the corresponding gradation curve, as shown in FIG. Figure 3 As shown. Figure 3 It can be seen that the composite gradation curve is between the upper limit curve and the lower limit curve of the gradation curve diagram, which meets the gradation requirements.

[0071] Coarse aggregate, part of water and part of slow-cracking emulsified asphalt were first mixed in a mixing pot for 60 seconds; then pre-wetted fine aggregate and the remaining slow-cracking emulsified asphalt were added and mixed for 60 seconds; finally, cement and mineral powder were added and mixed for 60 seconds to obtain AC-25 ordinary emulsified asphalt cold mix and cold paving asphalt mixture, which was then used to form Marshall specimens and rutting specimens, and the performance test results were recorded. The test items were marked as Example 2-(2).

[0072] Example 3 Preparation of emulsified asphalt cold mix cold paving asphalt pavement material (preparing the first surface layer material and the second surface layer material separately and combining them) (1) Preparation of AC-20SBS modified emulsified asphalt cold mix cold paving asphalt mixture Provide 63 parts of first coarse aggregate (limestone crushed stones with specifications of 0-20 mm and 5-10 mm), 34 parts of fine aggregate (limestone chips with specifications of 0-5 mm), 6.5 parts of mixing type SBS modified emulsified asphalt (mixing type SBS modified emulsified asphalt prepared by Example 1-(1); solid content 3.9 parts), 3 parts of water, 1.5 parts of cement (Silicate retarded cement) and 3 parts of mineral powder (limestone fine powder with specifications of 0.075 mm and a 0.075 mm sieve pass rate of >75%); Coarse aggregate, part of water and part of mixing type SBS modified emulsified asphalt were first mixed in a mixing pot for 60 seconds; then pre-wetted fine aggregate and the remaining mixing type SBS modified emulsified asphalt were added and mixed for 60 seconds; finally, cement and mineral powder were added and mixed for 60 seconds to obtain AC-20SBS modified emulsified asphalt cold mix cold paving asphalt mixture, which was then used to form Marshall specimens and rutting specimens, and the performance test results were recorded. The test items were marked as Example 3-(1).

[0073] (2) Preparation of AC-25 common emulsified asphalt cold mix cold paving asphalt mixture Provide 68 parts of second coarse aggregate (limestone materials with specifications of 20-30 mm, 10-20 mm and 5-10 mm), 30 parts of fine aggregate (limestone chips with specifications of 0-5 mm), 6.0 parts of slow-cracking mixing emulsified asphalt (slow-cracking mixing emulsified asphalt prepared by Example 1-(2); solid content 3.6 parts), 2 parts of water, 1.5 parts of cement (Silicate retarded cement) and 2 parts of mineral powder (limestone fine powder with a specification of 0.075 mm and a 0.075 mm sieve pass rate of >75%); Coarse aggregate, part of water and part of slow-cracking emulsified asphalt were first mixed in a mixing pot for 60 seconds; then pre-wetted fine aggregate and the remaining slow-cracking emulsified asphalt were added and mixed for 60 seconds; finally, cement and mineral powder were added and mixed for 60 seconds to obtain AC-25 ordinary emulsified asphalt cold mix and cold paving asphalt mixture, which was then used to form Marshall specimens and rutting specimens, and the performance test results were recorded. The test items were marked as Example 3-(2).

[0074] Example 4 Preparation of emulsified asphalt cold mix cold paving asphalt pavement material (preparing the first surface layer material and the second surface layer material separately and combining them) (1) Preparation of AC-20SBS modified emulsified asphalt cold mix cold paving asphalt mixture Provide 63 parts of first coarse aggregate (limestone crushed stones with specifications of 0-20 mm and 5-10 mm), 34 parts of fine aggregate (limestone chips with specifications of 0-5 mm), 8 parts of mixing type SBS modified emulsified asphalt (mixing type SBS modified emulsified asphalt prepared by Example 1-(1); solid content 4.8 parts), 3 parts of water, 1.5 parts of cement (Silicate retarded cement) and 3 parts of mineral powder (limestone fine powder with specifications of 0.075 mm and a 0.075 mm sieve pass rate of >75%); The coarse aggregate, part of the water and part of the mixing type SBS modified emulsified asphalt were first mixed in a mixing pot for 60 seconds; then the pre-wetted fine aggregate and the remaining mixing type SBS modified emulsified asphalt were added and mixed for 60 seconds; finally, cement and mineral powder were added and mixed for 60 seconds to obtain AC-20SBS modified emulsified asphalt cold mix cold paving asphalt mixture, which was then used to form Marshall specimens and rutting specimens, and the performance test results were recorded. The test items were marked as Example 4-(1).

[0075] (2) Preparation of AC-25 common emulsified asphalt cold mix cold paving asphalt mixture Provide 68 parts of second coarse aggregate (limestone materials with specifications of 20-30 mm, 10-20 mm and 5-10 mm), 30 parts of fine aggregate (limestone chips with specifications of 0-5 mm), 7.5 parts of slow-cracking emulsified asphalt (slow-cracking emulsified asphalt prepared by Example 1-(2); solid content 4.5 parts), 2 parts of water, 1.5 parts of cement (Silicate retarded cement) and 2 parts of mineral powder (limestone fine powder with a specification of 0.075 mm and a 0.075 mm sieve pass rate of >75%); Coarse aggregate, part of water and part of slow-cracking emulsified asphalt were first mixed in a mixing pot for 60 seconds; then pre-wetted fine aggregate and the remaining slow-cracking emulsified asphalt were added and mixed for 60 seconds; finally, cement and mineral powder were added and mixed for 60 seconds to obtain AC-25 ordinary emulsified asphalt cold mix and cold paving asphalt mixture, which was then used to form Marshall specimens and rutting specimens, and the performance test results were recorded. The test items were marked as Example 4-(2).

[0076] Comparative Example 1 Compared with Example 2, the combination of asphalt pavement materials is hot mix modified AC-20 asphalt mixture, hot mix AC-25 asphalt mixture (1) Preparation of hot-mix modified AC-20 asphalt mixture A hot-mix modified AC-20 asphalt mixture was obtained using the same gradation as in Example 2-(1), except that the mixing-type SBS modified emulsified asphalt was replaced with 4.3 parts of SBS modified asphalt having the same oil-to-stone ratio as in Example 2-(1). Performance tests were conducted on this hot-mix modified AC-20 asphalt mixture, and the performance test results were recorded. The test items are labeled Comparative Example 1-(1).

[0077] (2) Preparation of hot mix AC-25 asphalt mixture A hot-mix AC-25 asphalt mixture was prepared using the same gradation as in Example 2-(2), except that the slow-cracking emulsified asphalt was replaced with 4.0 parts of 70# asphalt having the same oil-to-aggregate ratio as in Example 2-(2). Performance tests were conducted on the hot-mix AC-25 asphalt mixture, and the test results were recorded. The test items are labeled Comparative Example 1-(2).

[0078] Comparative Example 2 Compared with Example 2, the combination of asphalt pavement materials is hot mix modified AC-20 asphalt mixture, hot mix AC-25 asphalt mixture (1) Preparation of hot-mix modified AC-20 asphalt mixture A hot-mix modified AC-20 asphalt mixture was obtained using the same gradation as in Example 2-(1), except that the mixing-type SBS modified emulsified asphalt was replaced with 4.8 parts of SBS modified asphalt having the same oil-to-stone ratio as in Example 4-(1). Performance tests were conducted on this hot-mix modified AC-20 asphalt mixture, and the performance test results were recorded. The test items are labeled Comparative Example 2-(1).

[0079] (2) Preparation of hot mix AC-25 asphalt mixture A hot-mix AC-25 asphalt mixture was prepared using the same gradation as in Example 2-(2), except that the slow-cracking emulsified asphalt was replaced with 3.6 parts of 70# asphalt having the same oil-to-stone ratio as in Example 3-(2). Performance tests were conducted on this hot-mix AC-25 asphalt mixture, and the test results were recorded. The test items are labeled Comparative Example 2-(2).

[0080] Comparative Example 3 Compared with Example 2, the combination of asphalt pavement materials is hot mix modified AC-20 asphalt mixture, hot mix AC-25 asphalt mixture (1) Preparation of hot-mix modified AC-20 asphalt mixture A hot-mix modified AC-20 asphalt mixture was obtained using the same gradation as in Example 2-(1), except that the mixing-type SBS modified emulsified asphalt was replaced with 3.9 parts of SBS modified asphalt having the same oil-to-stone ratio as in Example 3-(1). Performance tests were conducted on this hot-mix modified AC-20 asphalt mixture, and the performance test results were recorded. The test items are labeled Comparative Example 3-(1).

[0081] (2) Preparation of hot mix AC-25 asphalt mixture A hot-mix AC-25 asphalt mixture was obtained using the same gradation as in Example 2-(2), except that the slow-cracking emulsified asphalt was replaced with 4.5 parts of 70# asphalt having the same oil-to-stone ratio as in Example 4-(2). Performance tests were conducted on this hot-mix AC-25 asphalt mixture, and the performance test results were recorded. The test items are labeled Comparative Example 3-(2).

[0082] Analysis example 1 Performance tests for the test items in Examples 2-4 and Comparative Examples 1-3 included Marshall stability, residual stability, freeze-thaw splitting strength ratio, and dynamic stability. The specific performance test procedures were all in accordance with the relevant provisions of the "Testing Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011). The corresponding performance test results are shown in Tables 1 and 2, respectively. Table 1 compares the performance test results for the first surface layer material (AC-20SBS modified emulsified asphalt cold mix and cold lay asphalt mixture, or hot mix modified AC-20 asphalt mixture); Table 2 compares the performance test results for the second surface layer material (AC-25 conventional emulsified asphalt cold mix and cold lay asphalt mixture, or hot mix AC-25 asphalt mixture).

[0083] Table 1 Comparison of performance test results of the first surface layer materials Table 2 Comparison of performance test results of the second surface layer materials As can be seen from Table 1, the water stability of the AC-20SBS modified emulsified asphalt cold mix cold paving asphalt mixture in the embodiment is basically close to that of the hot mix modified AC-20 asphalt mixture in the comparative example with the same gradation and asphalt-aggregate ratio, and has better high-temperature rutting resistance.

[0084] As can be seen from Table 2, the water stability of the AC-25 ordinary emulsified asphalt cold mix cold paving asphalt mixture in the embodiment is basically close to that of the hot mix AC-25 asphalt mixture with the same gradation and asphalt-aggregate ratio, and has better high-temperature rutting resistance.

[0085] Therefore, AC-20SBS modified emulsified asphalt cold mix cold paving asphalt mixture and AC-25 ordinary emulsified asphalt cold mix cold paving asphalt mixture can be used as the middle and lower layer structure to completely replace the corresponding hot mix asphalt pavement material (combination of hot mix modified AC-20 asphalt mixture and hot mix AC-25 asphalt mixture). Specifically, in the actual asphalt pavement surface layer structure paving process, AC-25 ordinary emulsified asphalt cold mix cold paving asphalt mixture is used as the asphalt pavement surface layer structure (refer to Figure 1 ) as the bottom layer (8-12cm thick); AC-20SBS modified emulsified asphalt cold mix cold paving mixture as the middle layer (6-10cm thick); and SMA-13 ​​asphalt mixture as the top layer (3-5cm thick). The three surface layers are laid and compacted sequentially from bottom to top to form an asphalt pavement surface structure with strong resistance to road damage.

[0086] The above technical solutions of the present invention are only preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification under the technical concept of the present invention, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An emulsified asphalt cold mix cold paving asphalt pavement material, characterized in that: The emulsified asphalt cold mix cold paving type asphalt pavement material comprises a first surface layer material and a second surface layer material; The first surface layer material is an AC-20SBS modified emulsified asphalt cold mix cold paving asphalt mixture; the AC-20SBS modified emulsified asphalt cold mix cold paving asphalt mixture comprises: by mass, 50-70 parts of first coarse aggregate, 25-45 parts of fine aggregate, 6.5-8.0 parts of mixing type SBS modified emulsified asphalt, 2-5 parts of water, 1-3 parts of cement, and 1-5 parts of mineral powder; The second surface layer material is AC-25 common emulsified asphalt cold mix cold paving asphalt mixture; the AC-25 common emulsified asphalt cold mix cold paving asphalt mixture comprises: by mass, 55-75 parts of second coarse aggregate, 20-40 parts of the fine aggregate, 6.0-7.5 parts of slow-cracking emulsified asphalt, 1-4 parts of water, 1-3 parts of cement, and 1-5 parts of mineral powder; The mixing type SBS modified emulsified asphalt and the slow-cracking mixing type emulsified asphalt both include a slow-cracking mixing type emulsifier; the slow-cracking mixing type emulsifier is a lignin-based cationic slow-cracking mixing type emulsifier; the slow-cracking mixing type emulsifier includes, by mass percentage, ≥20% of the first composition and ≥15% of the second composition; wherein the first composition comprises at least two of tallow alkylpropylene diamine, hexadecyltrimethylammonium chloride, C16-C18 alkyl polyamine, distearyldimethylammonium chloride and alkylphenol polyoxyethylene ether; The second composition includes at least two of cocamidopropylamine, lauryl polyoxyethylene ether, cocamidopropyl betaine and acrylamide.

2. The emulsified asphalt cold mix cold paving type asphalt pavement material according to claim 1, characterized in that: The first coarse aggregate is limestone crushed stone; the specifications of the limestone crushed stone include 10-20 mm and 5-10 mm; The second coarse aggregate is limestone material; the specifications of the limestone material include 20~30mm, 10~20mm and 5~10mm; The fine aggregate is limestone chips; the specifications of the limestone chips include 0-5 mm.

3. The emulsified asphalt cold mix cold paving type asphalt pavement material according to claim 1, characterized in that: The mixing type SBS modified emulsified asphalt comprises, by mass, 60-65 parts of SBS modified asphalt, 1.5-2.5 parts of a mixing type SBS modified emulsifier, 0.5-1.5 parts of the slow-cracking mixing type emulsifier, 30-38 parts of water and 0.1-0.5 parts of a stabilizer.

4. The emulsified asphalt cold mix cold paving type asphalt pavement material according to claim 1, characterized in that: The slow-cracking mixing type emulsified asphalt comprises, by mass, 60-65 parts of base asphalt, 2.2-3.2 parts of the slow-cracking mixing type emulsifier, 30-38 parts of water and 0.1-0.5 parts of a stabilizer.

5. The emulsified asphalt cold mix cold paving type asphalt pavement material according to claim 1, characterized in that: The stabilizer includes one or more of ammonium chloride, potassium chloride, sodium chloride, polyvinyl alcohol, and polyacrylamide.

6. The emulsified asphalt cold mix cold paving type asphalt pavement material according to claim 1, characterized in that: The cement is silicate retarding cement.

7. The emulsified asphalt cold mix and cold paving asphalt pavement material according to claim 1, characterized in that: The mineral powder is limestone fine powder; the specification of the limestone fine powder is 0.075mm, and the pass rate of the limestone fine powder through the 0.075mm sieve is greater than 75%.

8. A method for preparing the emulsified asphalt cold mix cold paving type asphalt pavement material according to any one of claims 1 to 7, characterized in that: Provide mixing type SBS modified emulsified asphalt and slow cracking mixing type emulsified asphalt respectively; Mixing, by mass, 50-70 parts of the first coarse aggregate, 25-45 parts of the fine aggregate, 6.5-8.0 parts of the mixing type SBS modified emulsified asphalt, 2-5 parts of water, 1-3 parts of cement, and 1-5 parts of mineral powder to obtain an AC-20SBS modified emulsified asphalt cold mix and cold paving asphalt mixture; Mixing, by mass, 55-75 parts of the second coarse aggregate, 20-40 parts of the fine aggregate, 6.0-7.5 parts of slow-cracking emulsified asphalt, 1-4 parts of the water, 1-3 parts of the cement, and 1-5 parts of the mineral powder to obtain an AC-25 common emulsified asphalt cold mix and cold paving asphalt mixture; The mixing type SBS modified emulsified asphalt is obtained by mixing 60-65 parts of SBS modified asphalt, 1.5-2.5 parts of mixing type SBS modified emulsifier, 0.5-1.5 parts of slow-cracking mixing type emulsifier, 30-38 parts of water and 0.1-0.5 parts of stabilizer, calculated by mass; The slow-cracking mixing emulsified asphalt is obtained by mixing 60-65 parts by mass of base asphalt, 2.2-3.2 parts by mass of the slow-cracking mixing emulsifier, 30-38 parts by mass of the water, and 0.1-0.5 parts by mass of the stabilizer; The slow-cracking mixing emulsifier is a lignin-based cationic slow-cracking mixing emulsifier; the slow-cracking mixing emulsifier includes, by mass, a first composition ≥20% and a second composition ≥15%; the first composition includes at least two of tallow alkyl propylene diamine, hexadecyl trimethyl ammonium chloride, C16-C18 alkyl polyamine, distearyl dimethyl ammonium chloride and alkylphenol polyoxyethylene ether; the second composition includes at least two of cocamidopropyl amine, lauryl alcohol polyoxyethylene ether, cocamidopropyl betaine and acrylamide.

9. Use of the cold-mix, cold-laid asphalt pavement material of any one of claims 1 to 7 or the cold-mix, cold-laid asphalt pavement material prepared by the preparation method of claim 8 in an asphalt pavement surface structure, characterized in that: The lower layer structure of the asphalt pavement surface structure is paved using the emulsified asphalt cold mix cold paving type asphalt pavement material according to any one of claims 1 to 7 or the AC-25 common emulsified asphalt cold mix cold paving type asphalt pavement material prepared by the preparation method according to claim 8 as a raw material; The middle surface layer structure of the asphalt pavement surface layer structure is paved with AC-20SBS modified emulsified asphalt cold mix cold paving asphalt mixture in the emulsified asphalt cold mix cold paving type asphalt pavement material as raw material; The upper layer structure of the asphalt pavement surface structure is paved with SMA-13 ​​asphalt mixture as raw material; The thicknesses of the upper layer structure, the middle layer structure and the lower layer structure are 3-5 cm, 6-10 cm and 8-12 cm respectively.

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