Emulsified asphalt cold-mixing and cold-paving type asphalt pavement material, preparation method and application thereof

Abstract

The application provides an emulsified asphalt cold-mixing and cold-paving type asphalt pavement material, 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 AC-20 SBS modified emulsified asphalt cold-mixing and cold-paving asphalt mixture and AC-25 ordinary emulsified asphalt cold-mixing and cold-paving asphalt mixture. The material can effectively replace hot-mixing type asphalt pavement material; has equivalent asphalt pavement material performance, and the dynamic stability can reach 10500 times*mm ‑1 , far exceeding the technical requirement; 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, 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. When the material is applied to the asphalt pavement surface layer structure as a middle and lower layer structure, the pavement damage resistance is high.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of cement-based modified asphalt pavement materials, and particularly relates to an emulsified asphalt cold-mixed and cold-paved asphalt pavement material, a preparation method and application thereof. BACKGROUND

[0002] The existing asphalt pavement material is mainly hot-mixed asphalt mixture, and the finished product mixing temperature needs to be controlled at 160 DEG C to 180 DEG C. The mineral aggregate and asphalt are mainly heated by burning fossil energy such as light oil, heavy oil or natural gas in the production process, which will produce a large amount of dust, CO2, asphalt smoke and harmful gas, not only consumes a large amount of non-renewable fossil energy, pollutes the air, but also makes the production cost of the mixture relatively high, and the asphalt mixture will cause a certain degree of aging in the process of high-temperature mixing, transportation and construction, and the performance of the asphalt pavement will be greatly attenuated before the road is opened to traffic, thereby reducing the durability of the pavement.

[0003] Therefore, it is necessary to provide an emulsified asphalt cold-mixed and cold-paved asphalt pavement material, a preparation method and application thereof to solve the problems of air pollution, high construction cost and poor pavement performance of the existing asphalt pavement material. SUMMARY

[0004] The main purpose of the application is to provide an emulsified asphalt cold-mixed and cold-paved asphalt pavement material, a preparation method and application thereof, which aims to solve the problems of air pollution, high construction cost and poor pavement performance of the existing asphalt pavement material.

[0005] To achieve the above purpose, the application provides an emulsified asphalt cold-mixed and cold-paved asphalt pavement material, which comprises a first surface layer material and a second surface layer material.

[0006] The first surface layer material is AC-20 SBS modified emulsified asphalt cold-mixed and cold-paved asphalt mixture; the AC-20 SBS modified emulsified asphalt cold-mixed and cold-paved asphalt mixture comprises, by mass fraction, 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-mixed and cold-paved asphalt mixture; the AC-25 ordinary emulsified asphalt cold-mixed and cold-paved asphalt mixture comprises, by mass fraction, 55-75 parts of second coarse aggregate, 20-40 parts of the fine aggregate, 6.0-7.5 parts of slow-cracking mixing type emulsified asphalt, 1-4 parts of the water, 1-3 parts of the cement and 1-5 parts of the mineral powder.

[0008] The slow cracking emulsified asphalt and the slow cracking emulsified asphalt both comprise a slow cracking emulsifier; the slow cracking emulsifier is a lignin cationic slow cracking emulsifier; the slow cracking emulsifier comprises, in terms of mass ratio, a first composition ≥ 20% and a second composition ≥ 15%.

[0009] The first composition comprises at least two of tallow alkyl propylene diamine, cetyl trimethyl ammonium chloride, C16-C18 alkyl polyamine, dioctadecyl dimethyl ammonium chloride and alkyl phenol polyoxyethylene ether.

[0010] The second composition comprises at least two of cocamide propyl amine, lauryl polyoxyethylene ether, cocamide propyl betaine and acrylamide.

[0011] Further, the first coarse aggregate is limestone gravel; the specifications of the limestone gravel include two grades of 10-20 mm and 5-10 mm.

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

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

[0014] Further, the slow cracking emulsified asphalt comprises, in terms of mass fraction, base asphalt 60-65 parts, the slow cracking emulsifier 2.2-3.2 parts, the water 30-38 parts and the stabilizer 0.1-0.5 parts.

[0015] Further, the slow cracking emulsified asphalt comprises, in terms of mass fraction, base asphalt 60-65 parts, the slow cracking emulsifier 2.2-3.2 parts, the water 30-38 parts and the stabilizer 0.1-0.5 parts.

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

[0017] Further, the cement is a silicate retarding cement.

[0018] Further, the mineral powder is limestone fine powder; the specifications of the limestone fine powder are 0.075 mm, and the 0.075 mm screen passing rate of the limestone fine powder is >75%.

[0019] The application further provides a preparation method of the emulsified asphalt cold-mixed and cold-paved type asphalt pavement material.

[0020] The AC-20 SBS modified emulsified asphalt cold-mixed and cold-paved mixture is obtained by mixing and processing, in parts by mass, 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.

[0021] The AC-25 ordinary emulsified asphalt cold-mixed and cold-paved mixture is obtained by mixing and processing, in parts by mass, 55-75 parts of second coarse aggregate, 20-40 parts of the fine aggregate, 6.0-7.5 parts of the slow crack mixing type emulsified asphalt, 1-4 parts of the water, 1-3 parts of the cement and 1-5 parts of the mineral powder.

[0022] The mixing type SBS modified emulsified asphalt is obtained by mixing and processing, in parts 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 slow crack mixing type emulsifier, 30-38 parts of the water and 0.1-0.5 parts of stabilizer.

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

[0024] The slow crack mixing type emulsifier is a lignin cationic slow crack mixing type emulsifier; the slow crack mixing type emulsifier comprises, in parts by mass, ≥20% of a first composition and ≥15% of a second composition; the first composition comprises at least two of tallow alkyl propylenediamine, hexadecyl trimethyl ammonium chloride, C16-C18 alkyl polyamine, dioctadecyl dimethyl ammonium chloride and alkyl phenol polyoxyethylene ether; and the second composition comprises at least two of cocamide propyl amine, lauryl polyoxyethylene ether, cocamide propyl betaine and acrylamide.

[0025] The application further provides application of the emulsified asphalt cold-mixed and cold-paved type asphalt pavement material or the emulsified asphalt cold-mixed and cold-paved type asphalt pavement material prepared by the preparation method in any of the above in an asphalt pavement surface structure, and AC-25 ordinary emulsified asphalt cold-mixed and cold-paved mixture in the emulsified asphalt cold-mixed and cold-paved type asphalt pavement material or the emulsified asphalt cold-mixed and cold-paved type asphalt pavement material prepared by the preparation method is used as raw material to pave a lower layer structure of the asphalt pavement surface structure.

[0026] The AC-20 SBS modified emulsified asphalt cold-mixed and cold-paved asphalt mixture in the emulsified asphalt cold-mixed and cold-paved type asphalt pavement material is used as raw material to pave the middle surface layer structure of the asphalt pavement surface layer structure.

[0027] The SMA-13 asphalt mixture is used as raw material to pave the upper surface layer structure of the asphalt pavement surface layer structure.

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

[0029] Compared with the prior art, the emulsified asphalt cold-mixed and cold-paved type asphalt pavement material has at least the following advantages:

[0030] The emulsified asphalt cold-mixed and cold-paved type asphalt pavement material provided by the application is a composition product including AC-20 SBS modified emulsified asphalt cold-mixed and cold-paved asphalt mixture as first surface layer material and AC-25 ordinary emulsified asphalt cold-mixed and cold-paved asphalt mixture as second surface layer material. The emulsified asphalt cold-mixed and cold-paved type asphalt pavement material can effectively replace the corresponding hot-mixed type asphalt pavement material and has equivalent asphalt pavement material performance. Under the premise that the Marshall stability, residual stability and freeze-thaw splitting strength ratio are all higher than the technical requirement standard, the dynamic stability can reach 10500 times·mm -1 , which is much higher than the technical requirement (≥1000 times·mm -1 ). The overall performance is excellent, and the comprehensive durability of the pavement material in the whole life cycle is realized.

[0031] The preparation method of the emulsified asphalt cold-mixed and cold-paved type asphalt pavement material is simple and easy to operate, and heating and mixing treatment is not required. The preparation cost is low, clean production is realized, and the material is suitable for large-area promotion.

[0032] The emulsified asphalt cold-mixed and cold-paved type asphalt pavement material provided by the application can be used in the asphalt pavement surface layer structure as a middle and lower surface layer structure, combined with SMA-13 asphalt mixture to construct a three-layer surface layer structure, and can effectively replace the widely used hot-mixed asphalt mixture in the lower surface layer and the middle surface layer of the pavement surface layer structure, so that the asphalt pavement surface layer structure has strong pavement damage resistance and makes a positive contribution to the carbon peak and carbon neutralization targets. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings shown.

[0034] Figure 1 The asphalt pavement surface layer structure schematic diagram provided by the present application is shown in the following figure:

[0035] Figure 2 The gradation curve diagram of the AC-20 SBS modified emulsified asphalt cold mix cold paving asphalt mixture in the embodiment 2 of the present application is shown in the following figure:

[0036] Figure 3 The gradation curve diagram of the AC-25 ordinary emulsified asphalt cold mix cold paving asphalt mixture in the embodiment 2 of the present application is shown in the following figure.

[0037] The implementation, functional features and advantages of the present application will be further described with reference to the accompanying drawings. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0039] In addition, the technical solutions of the various embodiments of the present application can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the protection scope of the present application.

[0040] When the embodiments give numerical ranges, it should be understood that, unless otherwise stated by the present application, both endpoints of each numerical range and any number between the two endpoints can be selected. Unless otherwise defined, all technical and scientific terms used in the present application are consistent with the mastery of the prior art by those skilled in the art and the description of the present application. Any method, equipment and material of the prior art similar or equivalent to the method, equipment and material described in the embodiments of the present application can also be used to realize the present application.

[0041] In order to solve the problems of air pollution, high construction cost and poor pavement performance of the existing asphalt pavement material, the present application provides an emulsified asphalt cold mix cold paving type asphalt pavement material, which comprises a first surface layer material and a second surface layer material.

[0042] The first surface layer material is AC-20 SBS modified emulsified asphalt cold-mixed and cold-paved asphalt mixture; the AC-20 SBS modified emulsified asphalt cold-mixed and cold-paved asphalt mixture comprises, by mass fraction, 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. Specifically, it is obtained in the experimental research that, under the condition that the components satisfy the above mass ratio, the AC-20 SBS modified emulsified asphalt cold-mixed and cold-paved asphalt mixture can be ensured to be within the grading range required by the specification, and the performance of the AC-20 SBS modified emulsified asphalt cold-mixed and cold-paved asphalt mixture can be ensured to meet the performance index requirements of the specification. It should be noted that "AC-20" in the AC-20 SBS modified emulsified asphalt cold-mixed and cold-paved asphalt mixture represents a continuous asphalt mixture with a nominal maximum particle size of 19 mm.

[0043] The second surface layer material is AC-25 ordinary emulsified asphalt cold-mixed and cold-paved asphalt mixture; the AC-25 ordinary emulsified asphalt cold-mixed and cold-paved asphalt mixture comprises, by mass fraction, 55-75 parts of second coarse aggregate, 20-40 parts of fine aggregate, 6.0-7.5 parts of slow-cracking mixing type emulsified asphalt, 1-4 parts of water, 1-3 parts of cement and 1-5 parts of mineral powder. Specifically, it is obtained in the experimental research that, under the condition that the components satisfy the above mass ratio, the AC-25 ordinary emulsified asphalt cold-mixed and cold-paved asphalt mixture can be ensured to be within the grading range required by the specification, and the performance of the AC-25 ordinary emulsified asphalt cold-mixed and cold-paved asphalt mixture can be ensured to meet the performance index requirements of the specification. It should be noted that "AC-25" in the AC-25 ordinary emulsified asphalt cold-mixed and cold-paved asphalt mixture represents a continuous asphalt mixture with a nominal maximum particle size of 26.5 mm.

[0044] Further, the first coarse aggregate is limestone crushed stone; the specifications of the limestone crushed stone include two grades of 10-20 mm and 5-10 mm. Specifically, the AC-20 SBS modified emulsified asphalt cold-mixed and cold-paved asphalt mixture uses limestone crushed stone with specifications including two grades of 10-20 mm and 5-10 mm as the first coarse aggregate, which can ensure that the AC-20 SBS modified emulsified asphalt cold-mixed and cold-paved asphalt mixture obtained by grading has a nominal maximum particle size of 19 mm, and can serve as the skeleton structure required by the AC-20 SBS modified emulsified asphalt cold-mixed and cold-paved asphalt mixture.

[0045] The second coarse aggregate is a limestone material; specifications of the limestone material include three grades of 20-30mm, 10-20mm and 5-10mm. Specifically, the specifications of the limestone material including three grades of 20-30mm, 10-20mm and 5-10mm can guarantee that the nominal maximum particle size of the AC-25 ordinary emulsified asphalt cold-mixed and cold-paved asphalt mixture is 26.5mm and provide a stable skeleton structure for the AC-25 ordinary emulsified asphalt cold-mixed and cold-paved asphalt mixture.

[0046] The fine aggregate is limestone stone chips; specifications of the limestone stone chips include one grade of 0-5mm. Specifically, the fine aggregate using the limestone stone chips with the specification of one grade of 0-5mm can form asphalt mortar with the asphalt component in the AC-20 SBS modified emulsified asphalt cold-mixed and cold-paved asphalt mixture or the AC-25 ordinary emulsified asphalt cold-mixed and cold-paved asphalt mixture, fully fill the skeleton voids of the corresponding mixture, increase the adhesion between the asphalt and the aggregate, and guarantee the compactness of the AC-20 SBS modified emulsified asphalt cold-mixed and cold-paved asphalt mixture or the AC-25 ordinary emulsified asphalt cold-mixed and cold-paved asphalt mixture.

[0047] The emulsified asphalt cold-mixed and cold-paved asphalt pavement material provided by the application is a composition product including the AC-20 SBS modified emulsified asphalt cold-mixed and cold-paved asphalt mixture as the first surface layer material and the AC-25 ordinary emulsified asphalt cold-mixed and cold-paved asphalt mixture as the second surface layer material. The emulsified asphalt cold-mixed and cold-paved asphalt pavement material can effectively replace the corresponding hot-mixed asphalt pavement material; has equivalent performance of the asphalt pavement material, wherein, under the premise that the Marshall stability, residual stability and freeze-thaw splitting strength ratio are all higher than the technical requirement standard, the dynamic stability can reach 10500 times·mm -1 , which is much higher than the technical requirement (≥1000 times·mm -1 ); the overall performance is excellent, and the comprehensive durability of the pavement material in the whole life cycle is realized.

[0048] Further, the mixing type SBS modified emulsified asphalt includes, by mass fraction, SBS modified asphalt 60-65 parts, mixing type SBS modified emulsifier 1.5-2.5 parts, slow crack mixing type emulsifier 0.5-1.5 parts, water 30-38 parts and stabilizer 0.1-0.5 parts. Specifically, the viscosity, evaporation residue penetration and ductility and storage stability and other indexes of the mixing type SBS modified emulsified asphalt prepared in this grading mode meet the specification requirements. Preferably, the mixing type SBS modified emulsifier used is a slow crack mixing type SBS modified emulsifier produced by Tianjin Kangzewei Technology Co., Ltd.

[0049] Further, the slow crack mixing type emulsified asphalt comprises, by mass fraction, 60-65 parts of base asphalt, 2.2-3.2 parts of slow crack mixing type emulsifier, 30-38 parts of water and 0.1-0.5 parts of stabilizer. Specifically, the slow crack mixing type emulsified asphalt prepared in the grading manner meets the specification requirements in terms of viscosity, evaporation residue penetration, ductility and storage stability.

[0050] Further, the slow crack mixing type emulsifier is a lignin cationic slow crack mixing type emulsifier; the slow crack mixing type emulsifier comprises, by mass fraction, ≥20% of first composition and ≥15% of second composition. Specifically, the first composition ≥20% in the slow crack mixing type emulsifier can exert excellent emulsifying capacity and can effectively emulsify the base asphalt; the second composition ≥15% can reduce the interfacial tension and is helpful to emulsification, dispersion and stabilization; the two components synergistically cooperate to stably prepare the slow crack mixing type emulsified asphalt with excellent performance. Preferably, the mass fraction of the first composition is 20-60%; the rest is the second composition.

[0051] The first composition comprises at least two of tallow alkyl propylenediamine, hexadecyl trimethyl ammonium chloride, C16-C18 alkyl polyamine, dioctadecyl dimethyl ammonium chloride and alkyl phenol polyoxyethylene ether.

[0052] The second composition comprises at least two of cocamide propyl amine, lauryl polyoxyethylene ether, cocamide propyl betaine and acrylamide.

[0053] Further, the stabilizer comprises one or more of ammonium chloride, potassium chloride, sodium chloride, polyvinyl alcohol and polyacrylamide.

[0054] Further, the cement is a silicate retarding cement. Specifically, the silicate retarding cement can increase the early strength of the AC-20 SBS modified emulsified asphalt cold mixing and cold paving asphalt mixture or the AC-25 ordinary emulsified asphalt cold mixing and cold paving asphalt mixture and shorten the curing test piece.

[0055] Further, the mineral powder is limestone fine powder; the specification of the limestone fine powder is 0.075 mm and the 0.075 mm screen passing rate of the limestone fine powder is >75%. Specifically, the mineral powder with the specification can effectively improve the adhesion of the mixing type SBS modified emulsified asphalt or the slow crack mixing type emulsified asphalt to aggregate.

[0056] The application also provides a preparation method of the emulsified asphalt cold mixing and cold paving type asphalt pavement material according to any one of the above, and respectively provides the mixing type SBS modified emulsified asphalt and the slow crack mixing type emulsified asphalt.

[0057] The AC-20 SBS modified emulsified asphalt cold-mixed and cold-paved asphalt mixture is obtained by mixing and processing, 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.

[0058] The AC-25 ordinary emulsified asphalt cold-mixed and cold-paved asphalt mixture is obtained by mixing and processing, in parts by mass, 55-75 parts of second coarse aggregate, 20-40 parts of fine aggregate, 6.0-7.5 parts of slow-cracking mixing type emulsified asphalt, 1-4 parts of water, 1-3 parts of cement and 1-5 parts of mineral powder.

[0059] The mixing type SBS modified emulsified asphalt is obtained by mixing and processing, in parts 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 slow-cracking mixing type emulsifier, 30-38 parts of water and 0.1-0.5 parts of stabilizer.

[0060] The slow-cracking mixing type emulsified asphalt is obtained by mixing and processing, in parts by mass, 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.

[0061] The slow-cracking mixing type emulsifier is a lignin cationic slow-cracking mixing type emulsifier, and includes, in parts by mass, ≥20% of a first composition and ≥15% of a second composition; the first composition includes at least two of tallow alkyl propylenediamine, hexadecyl trimethyl ammonium chloride, C16-C18 alkyl polyamine, dioctadecyl dimethyl ammonium chloride and alkyl phenol polyoxyethylene ether; and the second composition includes at least two of cocamide propyl amine, lauryl polyoxyethylene ether, cocamide propyl betaine and acrylamide.

[0062] Preferably, the total duration of the mixing and processing is 100-200 seconds. Specifically, in an optional embodiment, the mixing and processing is performed in the following manner: first, the coarse aggregate, part of the water and part of the emulsified asphalt are mixed in a mixing kettle for 60 seconds; then, the pre-wetted fine aggregate and the remaining emulsified asphalt are mixed for 60 seconds; finally, the cement and the mineral powder are mixed for 60 seconds; wherein the emulsified asphalt is the mixing type SBS modified emulsified asphalt or the slow-cracking mixing type emulsified asphalt.

[0063] The preparation method of the emulsified asphalt cold-mixed and cold-paved asphalt pavement material is simple and easy to operate, and does not need to be heated and mixed and processed, so that the preparation cost is low, clean production is realized and the method is suitable for large-area promotion.

[0064] The application further provides application of the emulsified asphalt cold-mixed and cold-paved asphalt pavement material according to any one of the above or prepared by the preparation method to an asphalt pavement surface layer structure. The asphalt pavement surface layer structure is shown in the drawing. Figure 1 The AC-25 ordinary emulsified asphalt cold-mixed and cold-paved asphalt mixture in the emulsified asphalt cold-mixed and cold-paved asphalt pavement material is used as raw material to pave the lower layer structure 3 of the asphalt pavement surface layer structure.

[0065] The AC-20 SBS modified emulsified asphalt cold-mixed and cold-paved asphalt mixture in the emulsified asphalt cold-mixed and cold-paved asphalt pavement material is used as raw material to pave the middle layer structure 2 of the asphalt pavement surface layer structure.

[0066] The SMA-13 asphalt mixture is used as raw material to pave the upper layer structure 1 of the asphalt pavement surface layer structure. It should be noted that SMA-13 in the SMA-13 asphalt mixture represents a macadam bitumen mixture with a nominal maximum particle size of 13 mm.

[0067] 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.

[0068] The emulsified asphalt cold-mixed and cold-paved asphalt pavement material provided by the application can be used as a middle and lower layer structure in the asphalt pavement surface layer structure, and can be combined with the SMA-13 asphalt mixture to construct a three-layer upper, middle and lower layer structure. The emulsified asphalt cold-mixed and cold-paved asphalt pavement material can effectively replace the widely used hot-mixed asphalt mixture for the lower and middle layers of the pavement surface layer structure, and the asphalt pavement surface layer structure formed by the emulsified asphalt cold-mixed and cold-paved asphalt pavement material has strong pavement damage resistance. The emulsified asphalt cold-mixed and cold-paved asphalt pavement material makes a positive contribution to the carbon peak and carbon neutralization targets.

[0069] The following is a specific example of the application:

[0070] Example 1

[0071] (1) Preparation of a mixed SBS modified emulsified asphalt

[0072] 63 parts of SBS modified asphalt, 2 parts of mixed SBS modified emulsifier (slow crack mixed SBS modified emulsifier produced by Tianjin Kangzewei Technology Co., Ltd.), 1 part of slow crack mixed emulsifier (45% of a first composition composed of tallow alkyl propylene diamine and hexadecyl trimethyl ammonium chloride + 55% of a second composition composed of cocamide propyl amine, lauryl polyoxyethylene ether and cocamide propyl betaine), 33.7 parts of water and 0.3 parts of sodium chloride are mixed for 60 s to obtain a mixed SBS modified emulsified asphalt.

[0073] (2) Preparation of a slow crack mixed emulsified asphalt

[0074] 63 parts of base asphalt, 2.5 parts of slow cracking mix type emulsified asphalt (30% of a first composition consisting of dioctadecyldimethylammonium chloride and alkylphenol polyoxyethylene ether + 70% of a second composition consisting of cocamidopropyl betaine and acrylamide), 34.2 parts of water and ammonium chloride were mixed and treated for 60 s to obtain slow cracking mix type emulsified asphalt.

[0075] Example 2

[0076] Preparation of emulsified asphalt cold mix cold paving type asphalt pavement material (first surface layer material and second surface layer material are prepared respectively, and combined to obtain)

[0077] (1) Preparation of AC-20 SBS modified emulsified asphalt cold mix cold paving asphalt mixture

[0078] 63 parts of first coarse aggregate (limestone crushed stone with two specifications of 10-20 mm and 5-10 mm), 34 parts of fine aggregate (limestone stone chips with one specification of 0-5 mm), 7.2 parts of mix type SBS modified emulsified asphalt (the mix type SBS modified emulsified asphalt prepared in Example 1-(1); solid content 4.3 parts), 3 parts of water, 1.5 parts of cement (silicate retarding cement) and 3 parts of mineral powder (limestone fine powder with a specification of 0.075 mm, 0.075 mm screen passing rate > 75%) were provided; the synthetic gradation curve was obtained according to 63 parts of first coarse aggregate, 34 parts of fine aggregate and 3 parts of mineral powder, and the corresponding gradation curve was plotted, as shown in Figure 2 It can be seen from Figure 2 that the synthetic gradation curve is between the upper limit curve and the lower limit curve of the gradation curve graph, which meets the gradation requirements.

[0079] The coarse aggregate, part of the water and part of the mix type SBS modified emulsified asphalt were first mixed in a mixing kettle for 60 s; then the pre-wetted fine aggregate and the remaining mix type SBS modified emulsified asphalt were mixed for 60 s; finally, the cement and the mineral powder were mixed for 60 s, and the AC-20 SBS modified emulsified asphalt cold mix cold paving asphalt mixture was obtained by stirring, which was then used to form Marshall test pieces and rut test pieces, and the performance test results were recorded, and the test item was marked as Example 2-(1).

[0080] (2) Preparation of AC-25 ordinary emulsified asphalt cold mix cold paving asphalt mixture

[0081] 68 parts of second coarse aggregate (limestone material with three specifications of 20-30 mm, 10-20 mm and 5-10 mm), 30 parts of fine aggregate (limestone stone chips with one specification of 0-5 mm), 6.2 parts of slow cracking mixing type emulsified asphalt (slow cracking mixing type emulsified asphalt prepared by using Example 1-(2); solid content 4.0 parts), 2 parts of water, 1.5 parts of cement (silicate retarding cement) and 2 parts of mineral powder (limestone fine powder with specifications of 0.075 mm and 0.075 mm screen passing rate > 75%) are provided; a synthetic grading curve is obtained according to 68 parts of second coarse aggregate, 30 parts of fine aggregate and 2 parts of mineral powder, and a corresponding grading curve is plotted as shown in FIG. 2. Figure 3 As shown in FIG. 2, it can be seen that the synthetic grading curve is between the upper limit curve and the lower limit curve of the grading curve graph, and meets the grading requirements. Figure 3

[0082] The coarse aggregate, part of the water and part of the slow cracking mixing type emulsified asphalt are first mixed in a mixing pot for 60 s; then the pre-wetted fine aggregate and the remaining slow cracking mixing type emulsified asphalt are mixed for 60 s; finally, the cement and the mineral powder are mixed for 60 s, and an AC-25 ordinary emulsified asphalt cold mixing and cold paving asphalt mixture is obtained by stirring, which is then used to form Marshall test pieces and rut test pieces, and the performance test results are recorded, and the test item is marked as Example 2-(2).

[0083] Example 3

[0084] Preparation of emulsified asphalt cold mixing and cold paving type asphalt pavement material (first surface layer material and second surface layer material are prepared respectively, and combined to obtain)

[0085] (1) Preparation of AC-20 SBS modified emulsified asphalt cold mixing and cold paving asphalt mixture

[0086] 63 parts of first coarse aggregate (limestone crushed stone with two specifications of 10-20 mm and 5-10 mm), 34 parts of fine aggregate (limestone stone chips with one specification of 0-5 mm), 6.5 parts of mixing type SBS modified emulsified asphalt (mixing type SBS modified emulsified asphalt prepared by using Example 1-(1); solid content 3.9 parts), 3 parts of water, 1.5 parts of cement (silicate retarding cement) and 3 parts of mineral powder (limestone fine powder with specifications of 0.075 mm and 0.075 mm screen passing rate > 75%) are provided.

[0087] The coarse aggregate, part of the water and part of the mixing type SBS modified emulsified asphalt are first mixed in a mixing pot for 60 s; then the pre-wetted fine aggregate and the remaining mixing type SBS modified emulsified asphalt are mixed for 60 s; finally, the cement and the mineral powder are mixed for 60 s, and an AC-20 SBS modified emulsified asphalt cold mixing and cold paving asphalt mixture is obtained by stirring, which is then used to form Marshall test pieces and rut test pieces, and the performance test results are recorded, and the test item is marked as Example 3-(1). ​

[0088] (2) Preparation of AC-25 ordinary emulsified asphalt cold mix cold paving asphalt mixture

[0089] 68 parts of second coarse aggregate (limestone material with three specifications of 20-30 mm, 10-20 mm and 5-10 mm), 30 parts of fine aggregate (limestone stone chips with one specification of 0-5 mm), 6.0 parts of slow crack mixing type emulsified asphalt (slow crack mixing type emulsified asphalt prepared in Example 1-(2); solid content 3.6 parts), 2 parts of water, 1.5 parts of cement (silicate retarding cement) and 2 parts of mineral powder (limestone fine powder with specifications of 0.075 mm and 0.075 mm screen passing rate > 75%) were provided;

[0090] The coarse aggregate, part of the water and part of the slow crack mixing type emulsified asphalt were first mixed in the mixing kettle for 60 s; then the pre-wetted fine aggregate and the remaining slow crack mixing type emulsified asphalt were mixed for 60 s; finally, the cement and the mineral powder were mixed for 60 s, and the AC-25 ordinary emulsified asphalt cold mix cold paving asphalt mixture was obtained by stirring, which was then used to form Marshall test pieces and rut test pieces, and the performance test results were recorded. The test item is marked as Example 3-(2).

[0091] Example 4

[0092] Preparation of emulsified asphalt cold mix cold paving type asphalt pavement material (first surface layer material and second surface layer material are prepared respectively, and combined to obtain)

[0093] (1) Preparation of AC-20 SBS modified emulsified asphalt cold mix cold paving asphalt mixture

[0094] 63 parts of first coarse aggregate (limestone crushed stone with two specifications of 10-20 mm and 5-10 mm), 34 parts of fine aggregate (limestone stone chips with one specification of 0-5 mm), 8 parts of mixing type SBS modified emulsified asphalt (mixing type SBS modified emulsified asphalt prepared in Example 1-(1); solid content 4.8 parts), 3 parts of water, 1.5 parts of cement (silicate retarding cement) and 3 parts of mineral powder (limestone fine powder with specifications of 0.075 mm and 0.075 mm screen passing rate > 75%) were provided;

[0095] The coarse aggregate, part of the water and part of the mixing type SBS modified emulsified asphalt were first mixed in the mixing kettle for 60 s; then the pre-wetted fine aggregate and the remaining mixing type SBS modified emulsified asphalt were mixed for 60 s; finally, the cement and the mineral powder were mixed for 60 s, and the AC-20 SBS modified emulsified asphalt cold mix cold paving asphalt mixture was obtained by stirring, which was then used to form Marshall test pieces and rut test pieces, and the performance test results were recorded. The test item is marked as Example 4-(1).

[0096] (2) Preparation of AC-25 ordinary emulsified asphalt cold mix cold paving asphalt mixture

[0097] 68 parts of second coarse aggregate (limestone material with three specifications of 20-30 mm, 10-20 mm and 5-10 mm), 30 parts of fine aggregate (limestone stone chips with one specification of 0-5 mm), 7.5 parts of slow cracking mixing type emulsified asphalt (slow cracking mixing type emulsified asphalt prepared by using Example 1-(2); solid content 4.5 parts), 2 parts of water, 1.5 parts of cement (silicate retarding cement) and 2 parts of mineral powder (limestone fine powder with a specification of 0.075 mm, 0.075 mm screen passing rate >75%) were provided;

[0098] The coarse aggregate, part of the water and part of the slow cracking mixing type emulsified asphalt were first mixed in a mixing pot for 60 s; then the pre-wetted fine aggregate and the remaining slow cracking mixing type emulsified asphalt were mixed for 60 s; finally, the cement and the mineral powder were mixed for 60 s, and the AC-25 ordinary emulsified asphalt cold mixing and cold paving asphalt mixture was obtained by stirring, which was then used to form Marshall test pieces and rut test pieces, and the performance test results were recorded, and the test item was marked as Example 4-(2).

[0099] Comparative Example 1

[0100] Compared with Example 2, the combination of asphalt pavement materials is hot mixing modified AC-20 asphalt mixture and hot mixing AC-25 asphalt mixture

[0101] (1) Preparation of hot mixing modified AC-20 asphalt mixture

[0102] Except that the mixing type SBS modified emulsified asphalt was replaced by 4.3 parts of SBS modified asphalt with the same oil-stone ratio as that of Example 2-(1), the rest was the same as that of Example 2-(1), and the hot mixing modified AC-20 asphalt mixture was obtained. The performance test was carried out on the hot mixing modified AC-20 asphalt mixture, and the performance test results were recorded, and the test item was marked as Comparative Example 1-(1).

[0103] (2) Preparation of hot mixing AC-25 asphalt mixture

[0104] Except that the slow cracking mixing type emulsified asphalt was replaced by 4.0 parts of 70# asphalt with the same oil-stone ratio as that of Example 2-(2), the rest was the same as that of Example 2-(2), and the hot mixing AC-25 asphalt mixture was obtained. The performance test was carried out on the hot mixing AC-25 asphalt mixture, and the performance test results were recorded, and the test item was marked as Comparative Example 1-(2).

[0105] Comparative Example 2

[0106] Compared with Example 2, the combination of asphalt pavement materials is hot mixing modified AC-20 asphalt mixture and hot mixing AC-25 asphalt mixture

[0107] (1) Preparation of hot-mix modified AC-20 asphalt mixture

[0108] Except that the mixing type SBS modified emulsified asphalt is replaced by 4.8 parts of SBS modified asphalt having the same oil-stone ratio as that of Example 4-(1), the rest is the same gradation as that of Example 2-(1), to obtain the hot-mix modified AC-20 asphalt mixture. The performance test is carried out on the hot-mix modified AC-20 asphalt mixture, and the performance test results are recorded. The test item is marked as Comparative Example 2-(1).

[0109] (2) Preparation of hot-mix AC-25 asphalt mixture

[0110] Except that the slow crack mixing type emulsified asphalt is replaced by 3.6 parts of 70# asphalt having the same oil-stone ratio as that of Example 3-(2), the rest is the same gradation as that of Example 2-(2), to obtain the hot-mix AC-25 asphalt mixture. The performance test is carried out on the hot-mix AC-25 asphalt mixture, and the performance test results are recorded. The test item is marked as Comparative Example 2-(2).

[0111] Comparative Example 3

[0112] Compared with Example 2, the combination of asphalt pavement material is hot-mix modified AC-20 asphalt mixture, hot-mix AC-25 asphalt mixture

[0113] (1) Preparation of hot-mix modified AC-20 asphalt mixture

[0114] Except that the mixing type SBS modified emulsified asphalt is replaced by 3.9 parts of SBS modified asphalt having the same oil-stone ratio as that of Example 3-(1), the rest is the same gradation as that of Example 2-(1), to obtain the hot-mix modified AC-20 asphalt mixture. The performance test is carried out on the hot-mix modified AC-20 asphalt mixture, and the performance test results are recorded. The test item is marked as Comparative Example 3-(1).

[0115] (2) Preparation of hot-mix AC-25 asphalt mixture

[0116] Except that the slow crack mixing type emulsified asphalt is replaced by 4.5 parts of 70# asphalt having the same oil-stone ratio as that of Example 4-(2), the rest is the same gradation as that of Example 2-(2), to obtain the hot-mix AC-25 asphalt mixture. The performance test is carried out on the hot-mix AC-25 asphalt mixture, and the performance test results are recorded. The test item is marked as Comparative Example 3-(2).

[0117] Analysis Example 1

[0118] The performance test items of the test items of Examples 2-4, Comparative Examples 1-3 include Marshall stability, residual stability, freeze-thaw splitting strength ratio, dynamic stability; the specific performance test steps are all referred to the relevant provisions of "Highway Engineering Asphalt and Asphalt Mixture Test Regulation" (JTG E20-2011). The corresponding performance test results are shown in Table 1 and Table 2 respectively; wherein, Table 1 is a performance test result comparison table of the first surface layer material (AC-20 SBS modified emulsified asphalt cold mix cold paving asphalt mixture, or hot mix modified AC-20 asphalt mixture); Table 2 is a performance test result comparison table of the second surface layer material (AC-25 ordinary emulsified asphalt cold mix cold paving asphalt mixture, or hot mix AC-25 asphalt mixture).

[0119] Table 1 Performance test result comparison table of the first surface layer material

[0120]

[0121] Table 2 Performance test result comparison table of the second surface layer material

[0122]

[0123] From Table 1, it can be seen that the water stability performance of the AC-20 SBS modified emulsified asphalt cold mix cold paving asphalt mixture in the examples is basically close to that of the hot mix modified AC-20 asphalt mixture in the comparative examples under the same gradation and oil stone ratio, and has more excellent high temperature anti-rutting performance.

[0124] From Table 2, it can be seen that the water stability performance of the AC-25 ordinary emulsified asphalt cold mix cold paving asphalt mixture in the examples is basically close to that of the hot mix AC-25 asphalt mixture under the same gradation and oil stone ratio, and has more excellent high temperature anti-rutting performance.

[0125] Therefore, the AC-20 SBS modified emulsified asphalt cold mix cold paving asphalt mixture, the AC-25 ordinary emulsified asphalt cold mix cold paving asphalt mixture can be combined into an emulsified asphalt cold mix cold paving type asphalt pavement material as a middle and lower surface layer structure, completely replacing the corresponding hot mix type asphalt pavement material (combination of hot mix modified AC-20 asphalt mixture and hot mix AC-25 asphalt mixture). Specifically, in the process of laying the actual asphalt pavement surface layer structure, the AC-25 ordinary emulsified asphalt cold mix cold paving asphalt mixture is used as the asphalt pavement surface layer structure (referring to the first surface layer material in Table 1), and the AC-20 SBS modified emulsified asphalt cold mix cold paving asphalt mixture is used as the asphalt pavement surface layer structure (referring to the second surface layer material in Table 1). Figure 1) as a lower layer structure 3 (thickness of 8-12 cm); AC-20 SBS modified emulsified asphalt cold-mixed and cold-paved asphalt mixture as a middle layer structure 2 (thickness of 6-10 cm) of the asphalt pavement surface layer structure; and SMA-13 asphalt mixture as an upper layer structure 1 (thickness of 3-5 cm) of the asphalt pavement surface layer structure. The three layer materials are sequentially paved and compacted from bottom to top to form the asphalt pavement surface layer structure, which has strong road surface damage resistance.

[0126] In the above technical solution of the present application, the above is only a preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made by using the content of the present application specification, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. An emulsified asphalt cold mix cold lay type asphalt pavement material, characterized by, The emulsified asphalt cold-mixed and cold-paved type asphalt pavement material comprises a first surface layer material and a second surface layer material; The first surface layer material is AC-20 SBS modified emulsified asphalt cold-mixed and cold-paved asphalt mixture; the AC-20 SBS modified emulsified asphalt cold-mixed and cold-paved asphalt mixture comprises, by mass fraction, 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 ordinary emulsified asphalt cold-mixed and cold-paved asphalt mixture; the AC-25 ordinary emulsified asphalt cold-mixed and cold-paved asphalt mixture comprises, by mass fraction, 55-75 parts of second coarse aggregate, 20-40 parts of fine aggregate, 6.0-7.5 parts of slow cracking mixing type 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 comprise slow cracking mixing type emulsifier; the slow cracking mixing type emulsifier comprises, by mass fraction, first composition ≥ 20% and second composition ≥ 15%; The first composition comprises at least two of bovine tallow alkyl propylene diamine, hexadecyl trimethyl ammonium chloride, C16-C18 alkyl polyamine, dioctadecyl dimethyl ammonium chloride and alkyl phenol polyoxyethylene ether; The second composition comprises at least two of cocamide propyl amine, lauryl polyoxyethylene ether, cocamide propyl betaine and acrylamide.

2. The emulsified asphalt cold-mix cold-laid type asphalt pavement material according to claim 1, characterized by, The first coarse aggregate is limestone crushed stone; the specifications of the limestone crushed stone include two grades of 10-20 mm and 5-10 mm; The second coarse aggregate is limestone material; the specifications of the limestone material include three grades of 20-30 mm, 10-20 mm and 5-10 mm; The fine aggregate is limestone stone chips; the specifications of the limestone stone chips include one grade of 0-5 mm.

3. The emulsified asphalt cold-mix cold-lay type asphalt pavement material according to claim 1, characterized by, The mixing type SBS modified emulsified asphalt comprises, by mass fraction, 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.

4. The emulsified asphalt cold-mix cold-lay type asphalt pavement material according to claim 1, characterized by, The slow cracking mixing type emulsified asphalt comprises, by mass fraction, 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 stabilizer.

5. The emulsified asphalt cold mix cold lay type asphalt pavement material according to claim 3 or 4, characterized in that, The stabilizer comprises one or more of chloroammonium, chloropotassium, chlorosodium, polyvinyl alcohol and polyacrylamide.

6. The emulsified asphalt cold-mix cold-lay type asphalt pavement material according to claim 1, characterized by, The cement is silicate retarding cement.

7. The emulsified asphalt cold-mix cold-lay type asphalt pavement material according to claim 1, characterized by, The mineral powder is limestone fine powder; the specification of the limestone fine powder is 0.075 mm, and the 0.075 mm screen passing rate of the limestone fine powder is >75%.

8. A method for preparing emulsified asphalt cold-mix cold-pavement pavement material as described in any one of claims 1 to 7, characterized in that, Mixing type SBS modified emulsified asphalt and slow cracking mixing type emulsified asphalt are provided respectively; AC-20 SBS modified emulsified asphalt cold-mixed and cold-laid asphalt mixture is obtained by mixing and processing, in parts by mass, 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; AC-25 ordinary emulsified asphalt cold-mixed and cold-laid asphalt mixture is obtained by mixing and processing, in parts by mass, 55-75 parts of second coarse aggregate, 20-40 parts of fine aggregate, 6.0-7.5 parts of slow cracking mixing type 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 is obtained by mixing and processing, in parts 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 slow cracking mixing type emulsifier, 30-38 parts of water and 0.1-0.5 parts of stabilizer; The slow cracking mixing type emulsified asphalt is obtained by mixing and processing, in parts 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 the stabilizer; The slow cracking mixing type emulsifier comprises, in parts by mass, ≥20% of a first composition and ≥15% of a second composition; the first composition comprises at least two of bovine tallow alkyl propylene diamine, hexadecyl trimethyl ammonium chloride, C16-C18 alkyl polyamine, distearyl dimethyl ammonium chloride and alkyl phenol polyoxyethylene ether; and the second composition comprises at least two of cocamide propyl amine, lauryl polyoxyethylene ether, cocamide propyl betaine and acrylamide.

9. Application of the emulsified asphalt cold-mixed and cold-laid type asphalt pavement material according to any one of claims 1-7 or prepared by the preparation method of claim 8 in an asphalt pavement surface layer structure, characterized in that: AC-25 ordinary emulsified asphalt cold-mixed and cold-laid asphalt mixture in the emulsified asphalt cold-mixed and cold-laid type asphalt pavement material is used as raw material to pave a lower layer structure of the asphalt pavement surface layer structure; AC-20 SBS modified emulsified asphalt cold-mixed and cold-laid asphalt mixture in the emulsified asphalt cold-mixed and cold-laid type asphalt pavement material is used as raw material to pave a middle layer structure of the asphalt pavement surface layer structure; SMA-13 asphalt mixture is used as raw material to pave an upper layer structure of the asphalt pavement surface layer structure; 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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