Cold-mixed emulsified asphalt mixture and preparation method thereof

Abstract

The invention discloses a cold-mixed emulsified asphalt mixture, which is prepared from the following raw materials in parts by weight: 100 to 150 parts of emulsified asphalt, 20 to 30 parts of mineral powder, 130 to 135 parts of cement, 20 to 25 parts of gravel with the particle size of 10mm, 50 to 70 parts of water and 3 to 5 parts of polycarboxylate superplasticizer. According to the cold-mixed emulsified asphalt mixture disclosed by the invention, the emulsified asphalt is matched with the raw materials such as the mineral powder, the cement and the gravel, and the nano calcium carbonate modifier and the modifier are added for blending and coordinating to achieve joint synergism, so that the obtained emulsified asphalt mixture product has excellent water stability of the cold-mixed emulsified asphalt mixture; meanwhile, the freeze-thaw splitting strength and the stability effect of the product are remarkable.

Description

Technical Field

[0001] The invention relates to the technical field of emulsified asphalt mixing, and in particular to a cold-mixed emulsified asphalt mixture and a preparation method thereof. Background Art

[0002] Asphalt pavement is mainly made of hot-mix asphalt mixture. During the production process, the aggregate and asphalt need to be heated to a certain temperature according to the type of mixture to meet the production and construction requirements. The mineral material needs to be heated to 180℃~220℃, the asphalt needs to be heated to 160℃~180℃, and the finished product mixing temperature needs to be controlled at 160℃~180℃. Mineral materials and asphalt are mainly heated by fossil energy such as light oil, heavy oil and natural gas during the production process, which will produce a large amount of dust, CO2, asphalt smoke and harmful gases, which not only consumes a large amount of non-renewable fossil energy and pollutes the air, but also makes the production cost of the mixture higher. In addition, the asphalt will age to a certain extent during the high-temperature mixing, transportation and construction of the asphalt mixture. The performance of the asphalt pavement has been greatly attenuated before the road is opened to traffic, resulting in reduced pavement durability.

[0003] Light oil mainly produces non-methane hydrocarbons, CO2, nitrogen oxides and water after combustion; heavy oil is relatively viscous and difficult to volatilize. In addition to the above substances, it also produces other substances containing a large amount of sulfur, wax and metals after combustion; natural gas is mainly composed of alkanes, of which methane accounts for the vast majority. Methane burns to produce CO2 and water when there is sufficient oxygen, and produces carbon monoxide when there is insufficient oxygen. The Air Pollution Prevention and Control Law also defines light diesel as a clean energy source, and prohibits the use of heavy oil and residual oil in Class I ambient air areas. Such regulations are due to the fact that heavy oil is highly polluting, but even clean energy will produce a large amount of carbon oxides and other gases.

[0004] The research on emulsified asphalt cold mix asphalt mixture started relatively late in my country. It is a new type of "green" asphalt pavement material. At present, it is often used in the surface layer and seal layer construction of low-grade roads in new pavements or for pavement repair in pavement maintenance. There is little research and practical application in the structural layer of high-grade new pavements or major and medium-sized repair pavements. The main reasons are: (1) There are few research results on cold mix asphalt mixture technology, the mixture performance is low, the molding time is long, and it is immature. The industry standards for its production and paving construction process mainly refer to the technical specifications of hot mix asphalt mixtures, and its road performance cannot be comparable to that of the same type of hot mix asphalt mixtures. (2) To date, there is no standard system for cold mix cold paved emulsified asphalt mixtures in China to evaluate its mixture proportion design method and basic road performance. (3) The maintenance time of cold mix asphalt pavement is long, and traffic cannot be opened in time, which affects the construction period. (4) Construction units do not attach importance to the promotion and application of cold mix asphalt mixture technology. The use of emulsified asphalt cold mix asphalt mixture instead of hot mix asphalt mixture for asphalt pavement structure layers of various grades can largely solve the problems of fossil energy consumption and environmental pollution caused by the production of hot mix asphalt mixture, greatly save non-renewable fossil energy, and improve the production and construction environment. Therefore, it is urgent to increase the research and development and promotion and application of cold mix cold paving asphalt mixture technology.

[0005] However, the existing cold-mixed emulsified asphalt mixture has poor water stability, and the product's freeze-thaw splitting strength and stability are poor, which limits the use efficiency of the product. Based on this, the present invention further improves it. Summary of the invention

[0006] In view of the defects of the prior art, the purpose of the present invention is to provide a cold mix emulsified asphalt mixture and a preparation method thereof to solve the problems raised in the above background technology.

[0007] The present invention solves the technical problem by adopting the following technical solution:

[0008] The present invention provides a cold-mixed emulsified asphalt mixture, comprising the following raw materials in parts by weight:

[0009] Emulsified asphalt 100-150 parts, mineral powder 20-30 parts, cement 130-135 parts, 10mm crushed stone 20-25 parts, water 50-70 parts, polycarboxylate water reducer 3-5 parts;

[0010] The emulsified asphalt is a mixture of dodecylamine emulsifier, natural asphalt and water in a weight ratio of 2:7:4.

[0011] Preferably, the emulsified asphalt mixture also includes 2-5 parts of nano calcium carbonate modifier and 4-7 parts of performance adjusting agent.

[0012] Preferably, the preparation method of the nano calcium carbonate modifier is:

[0013] S01: Add 2-5 parts of calcium sulfate whiskers, 1-3 parts of silane coupling agent KH550, and 2-4 parts of sodium dodecylbenzene sulfonate to 4-7 parts of lanthanum chloride solution, and stir to obtain calcium sulfate whisker solution;

[0014] S02: adding the nano-calcium carbonate to a calcium sulfate whisker solution which is 3-5 times the total amount of the nano-calcium carbonate, stirring and modifying the solution, washing with water, and drying the solution to obtain modified nano-calcium carbonate;

[0015] S03: 1-3 parts of hydroxyapatite, 2-5 parts of yttrium nitrate solution, and 4-7 parts of 5% by mass sodium citrate solution are mixed to obtain a ball milling solution;

[0016] S04: The modified nano calcium carbonate and the ball milling liquid are mixed in a weight ratio of 5:3, and the ball milling is performed at a ball milling speed of 1500 r / min for 2 hours. After the ball milling is completed, the mixture is washed with water and dried to obtain a nano calcium carbonate modifier.

[0017] Preferably, the mass fraction of the lanthanum chloride solution is 2-5%; the mass fraction of the yttrium nitrate solution is 3-6%.

[0018] Preferably, the stirring speed of the stirring modification treatment is 550-750 r / min, and the stirring time is 30-40 min.

[0019] Preferably, the preparation method of the performance modifier is:

[0020] S11: preheat the flaky talc at 55-60°C for 10-15 minutes, then add it into a sufficient amount of sodium silicate solution, stir and mix, then filter and dry;

[0021] S12: 4-7 parts of dry flaky talc, 2-5 parts of carboxymethyl cellulose, 1-3 parts of chitosan solution and 2-3 parts of montmorillonite are mixed and stirred thoroughly. After the stirring is completed, the mixture is washed with water and dried to obtain a conditioning and chemical agent.

[0022] Preferably, the mass fraction of the sodium silicate solution is 5-7%; the mass fraction of the chitosan solution is 3-5%.

[0023] Preferably, the blending is sufficiently stirred at a stirring speed of 550-750 r / min, and the stirring time is 1-2 h.

[0024] The present invention also provides a method for preparing a cold-mixed emulsified asphalt mixture, comprising the following steps:

[0025] The raw materials are weighed according to parts by weight, and then the raw materials are evenly mixed to obtain the cold-mix emulsified asphalt mixture of the present invention.

[0026] Preferably, the uniform mixing step is 750-850 r / min, and the stirring time is 1-2 h.

[0027] In order to accelerate the transformation of asphalt mixture application technology in the field of road engineering, reduce fossil energy consumption, reduce environmental pollution, and contribute to the early realization of carbon peak and carbon neutrality, the present invention will focus on the research and application promotion of emulsified asphalt cold mix cold paving asphalt mixture technology, so that it can be successfully used in asphalt pavement structure layers of different road grades, which has the following important significance:

[0028] (1) It not only reduces the consumption of fossil energy, but also reduces environmental pollution and physical harm to on-site production and application personnel.

[0029] (2) It reduces the investment in production equipment and production costs, thus saving a lot of manpower, material resources and capital investment.

[0030] (3) The construction of room temperature asphalt mixture is not affected by time, temperature, etc., and can be constructed in spring, summer, autumn and winter, which makes up for the limitation that hot mix asphalt is not suitable for construction in winter, especially in high-altitude cold areas.

[0031] (4) Asphalt is basically not aged during the cold mix and cold paving process, which can reduce the possibility of asphalt aging and cracking, extend the service life of the road surface, and reduce the life cycle cost of the road surface.

[0032] (5) A new model for asphalt pavement construction has been found.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The cold-mix emulsified asphalt mixture of the present invention adopts emulsified asphalt in combination with mineral powder, cement, crushed stone and other raw materials, and is coordinated and coordinated by adding nano calcium carbonate modifier and performance regulator to enhance the performance together. The obtained cold-mix emulsified asphalt mixture product has excellent water stability, and the freeze-thaw splitting strength and stability of the product are also remarkable. DETAILED DESCRIPTION

[0035] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with specific embodiments. Obviously, the described embodiments 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 creative work are within the scope of protection of the present invention.

[0036] A cold-mixed emulsified asphalt mixture of this embodiment includes the following raw materials in parts by weight:

[0037] Emulsified asphalt 100-150 parts, mineral powder 20-30 parts, cement 130-135 parts, 10mm crushed stone 20-25 parts, water 50-70 parts, polycarboxylate water reducer 3-5 parts;

[0038] The emulsified asphalt is a mixture of dodecylamine emulsifier, natural asphalt and water in a weight ratio of 2:7:4.

[0039] The emulsified asphalt mixture of this embodiment also includes 2-5 parts of nano calcium carbonate modifier and 4-7 parts of conditioning agent.

[0040] The preparation method of the nano calcium carbonate modifier of the present embodiment is:

[0041] S01: Add 2-5 parts of calcium sulfate whiskers, 1-3 parts of silane coupling agent KH550, and 2-4 parts of sodium dodecylbenzene sulfonate to 4-7 parts of lanthanum chloride solution, and stir to obtain calcium sulfate whisker solution;

[0042] S02: adding the nano-calcium carbonate to a calcium sulfate whisker solution which is 3-5 times the total amount of the nano-calcium carbonate, stirring and modifying the solution, washing with water, and drying the solution to obtain modified nano-calcium carbonate;

[0043] S03: 1-3 parts of hydroxyapatite, 2-5 parts of yttrium nitrate solution, and 4-7 parts of 5% by mass sodium citrate solution are mixed to obtain a ball milling solution;

[0044] S04: The modified nano calcium carbonate and the ball milling liquid are mixed in a weight ratio of 5:3, and the ball milling is performed at a ball milling speed of 1500 r / min for 2 hours. After the ball milling is completed, the mixture is washed with water and dried to obtain a nano calcium carbonate modifier.

[0045] The mass fraction of the lanthanum chloride solution in this embodiment is 2-5%; the mass fraction of the yttrium nitrate solution is 3-6%.

[0046] The stirring speed of the stirring modification treatment in this embodiment is 550-750 r / min, and the stirring time is 30-40 min.

[0047] The preparation method of the effect-adjusting and activating agent of the present embodiment is:

[0048] S11: preheat the flaky talc at 55-60°C for 10-15 minutes, then add it into a sufficient amount of sodium silicate solution, stir and mix, then filter and dry;

[0049] S12: 4-7 parts of dry flaky talc, 2-5 parts of carboxymethyl cellulose, 1-3 parts of chitosan solution and 2-3 parts of montmorillonite are mixed and stirred thoroughly. After the stirring is completed, the mixture is washed with water and dried to obtain a conditioning and chemical agent.

[0050] The mass fraction of the sodium silicate solution in this embodiment is 5-7%; the mass fraction of the chitosan solution is 3-5%.

[0051] The stirring speed for sufficient blending and stirring in this embodiment is 550-750 r / min, and the stirring is performed for 1-2 hours.

[0052] A method for preparing a cold-mixed emulsified asphalt mixture in this embodiment comprises the following steps:

[0053] The raw materials are weighed according to parts by weight, and then the raw materials are evenly mixed to obtain the cold-mix emulsified asphalt mixture of the present invention.

[0054] The mixing step of this embodiment is 750-850r / min, and the stirring time is 1-2h.

[0055] Example 1.

[0056] A cold-mixed emulsified asphalt mixture of this embodiment includes the following raw materials in parts by weight:

[0057] 100 parts of emulsified asphalt, 20 parts of mineral powder, 130 parts of cement, 20 parts of crushed stone with a particle size of 10 mm, 50 parts of water, and 3 parts of polycarboxylate water reducer;

[0058] The emulsified asphalt is a mixture of dodecylamine emulsifier, natural asphalt and water in a weight ratio of 2:7:4.

[0059] The emulsified asphalt mixture of this embodiment also includes 2 parts of nano calcium carbonate modifier and 4 parts of conditioning agent.

[0060] The preparation method of the nano calcium carbonate modifier of the present embodiment is:

[0061] S01: Add 2 parts of calcium sulfate whiskers, 1 part of silane coupling agent KH550, and 2 parts of sodium dodecylbenzene sulfonate to 4 parts of lanthanum chloride solution, and stir to obtain calcium sulfate whisker solution;

[0062] S02: adding the nano-calcium carbonate to a calcium sulfate whisker solution with a volume 3 times the total volume of the nano-calcium carbonate and stirring for modification, washing with water and drying after the stirring is completed to obtain modified nano-calcium carbonate;

[0063] S03: 1 part of hydroxyapatite, 2 parts of yttrium nitrate solution, and 4 parts of 5% by mass sodium citrate solution are mixed to obtain a ball milling solution;

[0064] S04: The modified nano calcium carbonate and the ball milling liquid are mixed in a weight ratio of 5:3, and the ball milling is performed at a ball milling speed of 1500 r / min for 2 hours. After the ball milling is completed, the mixture is washed with water and dried to obtain a nano calcium carbonate modifier.

[0065] The mass fraction of the lanthanum chloride solution in this embodiment is 2%; the mass fraction of the yttrium nitrate solution is 3%.

[0066] The stirring speed of the stirring modification treatment in this embodiment is 550 r / min, and the stirring time is 30 min.

[0067] The preparation method of the effect-adjusting and activating agent of the present embodiment is:

[0068] S11: preheat the flaky talc at 55°C for 10 min, then add it into a sufficient amount of sodium silicate solution, stir and mix, then filter and dry;

[0069] S12: Blend 4 parts of dry flaky talc, 2 parts of carboxymethyl cellulose, 1 part of chitosan solution and 2 parts of montmorillonite and stir thoroughly. After stirring, wash with water and dry to obtain a conditioning and chemical agent.

[0070] The mass fraction of the sodium silicate solution in this embodiment is 5%; the mass fraction of the chitosan solution is 3%.

[0071] The stirring speed for sufficient blending and stirring in this embodiment is 550 r / min, and the stirring is performed for 1 hour.

[0072] A method for preparing a cold-mixed emulsified asphalt mixture in this embodiment comprises the following steps:

[0073] The raw materials are weighed according to parts by weight, and then the raw materials are evenly mixed to obtain the cold-mix emulsified asphalt mixture of the present invention.

[0074] The mixing step of this embodiment is 750r / min and the stirring time is 1h.

[0075] Example 2.

[0076] A cold-mixed emulsified asphalt mixture of this embodiment includes the following raw materials in parts by weight:

[0077] 150 parts of emulsified asphalt, 30 parts of mineral powder, 135 parts of cement, 25 parts of crushed stone with a particle size of 10 mm, 70 parts of water, and 5 parts of polycarboxylate water reducer;

[0078] The emulsified asphalt is a mixture of dodecylamine emulsifier, natural asphalt and water in a weight ratio of 2:7:4.

[0079] The emulsified asphalt mixture of this embodiment also includes 5 parts of nano calcium carbonate modifier and 7 parts of conditioning agent.

[0080] The preparation method of the nano calcium carbonate modifier of the present embodiment is:

[0081] S01: Add 5 parts of calcium sulfate whiskers, 3 parts of silane coupling agent KH550, and 4 parts of sodium dodecylbenzene sulfonate to 7 parts of lanthanum chloride solution, and stir to obtain calcium sulfate whisker solution;

[0082] S02: adding the nano-calcium carbonate to a calcium sulfate whisker solution with a volume of 5 times the total volume of the nano-calcium carbonate and stirring for modification, washing with water and drying after the stirring is completed to obtain modified nano-calcium carbonate;

[0083] S03: 3 parts of hydroxyapatite, 5 parts of yttrium nitrate solution, and 7 parts of 5% by mass sodium citrate solution are mixed to obtain a ball milling solution;

[0084] S04: The modified nano calcium carbonate and the ball milling liquid are mixed in a weight ratio of 5:3, and the ball milling is performed at a ball milling speed of 1500 r / min for 2 hours. After the ball milling is completed, the mixture is washed with water and dried to obtain a nano calcium carbonate modifier.

[0085] The mass fraction of the lanthanum chloride solution in this embodiment is 5%; the mass fraction of the yttrium nitrate solution is 6%.

[0086] The stirring speed of the stirring modification treatment in this embodiment is 750 r / min, and the stirring time is 40 min.

[0087] The preparation method of the effect-adjusting and activating agent of the present embodiment is:

[0088] S11: preheat the flaky talc at 60°C for 15 minutes, then add it into a sufficient amount of sodium silicate solution, stir and mix, then filter and dry;

[0089] S12: 7 parts of dry flaky talc, 5 parts of carboxymethyl cellulose, 3 parts of chitosan solution and 3 parts of montmorillonite are mixed and stirred thoroughly. After the stirring is completed, the mixture is washed with water and dried to obtain a conditioning and chemical agent.

[0090] The mass fraction of the sodium silicate solution in this embodiment is 7%; the mass fraction of the chitosan solution is 5%.

[0091] The stirring speed for sufficient blending and stirring in this embodiment is 750 r / min, and the stirring is carried out for 2 hours.

[0092] A method for preparing a cold-mixed emulsified asphalt mixture in this embodiment comprises the following steps:

[0093] The raw materials are weighed according to parts by weight, and then the raw materials are evenly mixed to obtain the cold-mix emulsified asphalt mixture of the present invention.

[0094] The mixing step of this embodiment is 850r / min and the stirring time is 2h.

[0095] Example 3.

[0096] A cold-mixed emulsified asphalt mixture of this embodiment includes the following raw materials in parts by weight:

[0097] 125 parts of emulsified asphalt, 25 parts of mineral powder, 132 parts of cement, 22 parts of crushed stone with a particle size of 10 mm, 60 parts of water, and 4 parts of polycarboxylate water reducer;

[0098] The emulsified asphalt is a mixture of dodecylamine emulsifier, natural asphalt and water in a weight ratio of 2:7:4.

[0099] The emulsified asphalt mixture of this embodiment also includes 3.5 parts of nano calcium carbonate modifier and 5.5 parts of conditioning agent.

[0100] The preparation method of the nano calcium carbonate modifier of the present embodiment is:

[0101] S01: Add 3.5 parts of calcium sulfate whiskers, 2 parts of silane coupling agent KH550, and 3 parts of sodium dodecylbenzene sulfonate to 5.5 parts of lanthanum chloride solution, and stir to obtain calcium sulfate whisker solution;

[0102] S02: adding the nano-calcium carbonate to a calcium sulfate whisker solution with a volume of 4 times the total volume of the nano-calcium carbonate and stirring for modification, washing with water and drying after the stirring is completed to obtain modified nano-calcium carbonate;

[0103] S03: 2 parts of hydroxyapatite, 3.5 parts of yttrium nitrate solution, and 5.5 parts of 5% by mass sodium citrate solution are mixed to obtain a ball milling solution;

[0104] S04: The modified nano calcium carbonate and the ball milling liquid are mixed in a weight ratio of 5:3, and the ball milling is performed at a ball milling speed of 1500 r / min for 2 hours. After the ball milling is completed, the mixture is washed with water and dried to obtain a nano calcium carbonate modifier.

[0105] The mass fraction of the lanthanum chloride solution in this embodiment is 3.5%; the mass fraction of the yttrium nitrate solution is 4.5%.

[0106] The stirring speed of the stirring modification treatment in this embodiment is 600 r / min, and the stirring time is 35 min.

[0107] The preparation method of the effect-adjusting and activating agent of the present embodiment is:

[0108] S11: preheat the flaky talc at 57°C for 12.5 min, then add it into a sufficient amount of sodium silicate solution, stir and mix, then filter and dry;

[0109] S12: 5.5 parts of dry flaky talc, 3.5 parts of carboxymethyl cellulose, 2 parts of chitosan solution and 2.5 parts of montmorillonite are mixed and stirred thoroughly. After the stirring is completed, the mixture is washed with water and dried to obtain a performance-adjusting and chemical agent.

[0110] The mass fraction of the sodium silicate solution in this embodiment is 6%; the mass fraction of the chitosan solution is 4%.

[0111] The stirring speed for sufficient blending and stirring in this embodiment is 600 r / min, and the stirring is carried out for 1.5 hours.

[0112] A method for preparing a cold-mixed emulsified asphalt mixture in this embodiment comprises the following steps:

[0113] The raw materials are weighed according to parts by weight, and then the raw materials are evenly mixed to obtain the cold-mix emulsified asphalt mixture of the present invention.

[0114] The mixing step of this embodiment is 770r / min and the stirring time is 1.2h.

[0115] Example 4.

[0116] A cold-mixed emulsified asphalt mixture of this embodiment includes the following raw materials in parts by weight:

[0117] 120 parts of emulsified asphalt, 22 parts of mineral powder, 132 parts of cement, 22 parts of crushed stone with a particle size of 10 mm, 52 parts of water, and 4 parts of polycarboxylate water reducer;

[0118] The emulsified asphalt is a mixture of dodecylamine emulsifier, natural asphalt and water in a weight ratio of 2:7:4.

[0119] The emulsified asphalt mixture of this embodiment also includes 3 parts of nano calcium carbonate modifier and 5 parts of conditioning agent.

[0120] The preparation method of the nano calcium carbonate modifier of the present embodiment is:

[0121] S01: Add 3 parts of calcium sulfate whiskers, 2 parts of silane coupling agent KH550, and 3 parts of sodium dodecylbenzene sulfonate to 5 parts of lanthanum chloride solution, and stir to obtain calcium sulfate whisker solution;

[0122] S02: adding the nano-calcium carbonate to a calcium sulfate whisker solution which is 3-5 times the total amount of the nano-calcium carbonate, stirring and modifying the solution, washing with water, and drying the solution to obtain modified nano-calcium carbonate;

[0123] S03: 2 parts of hydroxyapatite, 3 parts of yttrium nitrate solution, and 5 parts of 5% sodium citrate solution are mixed to obtain a ball milling solution;

[0124] S04: The modified nano calcium carbonate and the ball milling liquid are mixed in a weight ratio of 5:3, and the ball milling is performed at a ball milling speed of 1500 r / min for 2 hours. After the ball milling is completed, the mixture is washed with water and dried to obtain a nano calcium carbonate modifier.

[0125] The mass fraction of the lanthanum chloride solution in this embodiment is 3%; the mass fraction of the yttrium nitrate solution is 4%.

[0126] The stirring speed of the stirring modification treatment in this embodiment is 600 r / min, and the stirring time is 32 min.

[0127] The preparation method of the effect-adjusting and activating agent of the present embodiment is:

[0128] S11: preheat the flaky talc at 56°C for 12 minutes, then add it into a sufficient amount of sodium silicate solution, stir and mix, then filter and dry;

[0129] S12: 5 parts of dry flaky talc, 3 parts of carboxymethyl cellulose, 2 parts of chitosan solution and 2 parts of montmorillonite are mixed and stirred thoroughly. After the stirring is completed, the mixture is washed with water and dried to obtain a conditioning and chemical agent.

[0130] The mass fraction of the sodium silicate solution in this embodiment is 6%; the mass fraction of the chitosan solution is 4%.

[0131] The stirring speed for sufficient blending and stirring in this embodiment is 580 r / min, and the stirring is performed for 1.2 h.

[0132] A method for preparing a cold-mixed emulsified asphalt mixture in this embodiment comprises the following steps:

[0133] The raw materials are weighed according to parts by weight, and then the raw materials are evenly mixed to obtain the cold-mix emulsified asphalt mixture of the present invention.

[0134] The mixing step of this embodiment is 760r / min and the stirring time is 1.1h.

[0135] Comparative Example 1.

[0136] The difference from Example 3 is that no nano calcium carbonate modifier is added.

[0137] Comparative Example 2.

[0138] The difference from Example 3 is that no calcium sulfate whisker solution is added to the nano calcium carbonate modifier.

[0139] Comparative Example 3.

[0140] The difference from Example 3 is that no calcium sulfate whiskers or silane coupling agent KH550 are added to the calcium sulfate whisker solution.

[0141] Comparative Example 4.

[0142] The difference from Example 3 is that no ball milling liquid is added to the nano calcium carbonate modifier.

[0143] Comparative Example 5.

[0144] The difference from Example 3 is that hydroxyapatite is not added to the ball milling solution.

[0145] Comparative Example 6.

[0146] The difference from Example 3 is that no conditioning agent or chemical agent is added.

[0147] Comparative Example 7.

[0148] The difference from Example 3 is that S11 treatment is not used in the conditioning and chemical treatment.

[0149] Comparative Example 8.

[0150] The difference from Example 3 is that S12 treatment is not used in the efficiency adjustment and chemical treatment.

[0151] The performance test results of the products of Examples 1-4 and Comparative Examples 1-8 of the present invention are as follows.

[0152]

[0153]

[0154] It can be seen from Examples 1-4 and Comparative Examples 1-8 that the products of Examples 1-4 of the present invention have excellent residual strength ratios of freeze-thaw splitting tests, and at the same time, the residual stability of the products in water-immersion Marshall (48h) is remarkable. The present invention does not add a nano-calcium carbonate modifier, does not add a performance modifier, and the performance of the product deteriorates significantly. The synergistic effect of the two is used, and the product performance effect is most obvious.

[0155] The performance of the products tends to deteriorate when no calcium sulfate whisker liquid is added to the nano-calcium carbonate modifier, no calcium sulfate whisker is added to the calcium sulfate whisker liquid, no silane coupling agent KH550 is added to the nano-calcium carbonate modifier, no ball milling liquid is added to the ball milling liquid, no S11 treatment is used in the efficiency adjustment and chemical agent, and no S12 treatment is used in the efficiency adjustment and chemical agent. Only when the method of the present invention is used to obtain the product raw material, the product performance effect is the most significant, and other methods are not as obvious as the effect of the present invention.

[0156] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0157] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A cold mix emulsified asphalt mixture, characterized in that: It includes the following raw materials in parts by weight: 100-150 parts of emulsified asphalt, 20-30 parts of mineral powder, 130-135 parts of cement, 20-25 parts of crushed stone with a particle size of 10 mm, 50-70 parts of water, and 3-5 parts of polycarboxylate water reducer; The emulsified asphalt is a mixture of dodecylamine emulsifier, natural asphalt and water in a weight ratio of 2:7:

4.

2. A cold mix emulsified asphalt mixture according to claim 1, characterized in that: The emulsified asphalt mixture also includes 2-5 parts of nano calcium carbonate modifier and 4-7 parts of performance adjusting agent.

3. A cold mix emulsified asphalt mixture according to claim 2, characterized in that: The preparation method of the nano calcium carbonate modifier is: S01: Add 2-5 parts of calcium sulfate whiskers, 1-3 parts of silane coupling agent KH550, and 2-4 parts of sodium dodecylbenzene sulfonate to 4-7 parts of lanthanum chloride solution, and stir to obtain calcium sulfate whisker solution; S02: adding the nano-calcium carbonate to a calcium sulfate whisker solution which is 3-5 times the total amount of the nano-calcium carbonate, stirring and modifying the solution, washing with water, and drying the solution to obtain modified nano-calcium carbonate; S03: 1-3 parts of hydroxyapatite, 2-5 parts of yttrium nitrate solution, and 4-7 parts of 5% by mass sodium citrate solution are mixed to obtain a ball milling solution; S04: The modified nano calcium carbonate and the ball milling liquid are mixed in a weight ratio of 5:3, and the ball milling is performed at a ball milling speed of 1500 r / min for 2 hours. After the ball milling is completed, the mixture is washed with water and dried to obtain a nano calcium carbonate modifier.

4. A cold mix emulsified asphalt mixture according to claim 3, characterized in that: The mass fraction of the lanthanum chloride solution is 2-5%; the mass fraction of the yttrium nitrate solution is 3-6%.

5. The cold mix emulsified asphalt mixture according to claim 3, characterized in that: The stirring speed of the stirring modification treatment is 550-750 r / min, and the stirring time is 30-40 min.

6. The cold mix emulsified asphalt mixture according to claim 1, characterized in that: The preparation method of the effect-adjusting and chemical agent is as follows: S11: preheat the flaky talc at 55-60°C for 10-15 minutes, then add it into a sufficient amount of sodium silicate solution, stir and mix, then filter and dry; S12: 4-7 parts of dry flaky talc, 2-5 parts of carboxymethyl cellulose, 1-3 parts of chitosan solution and 2-3 parts of montmorillonite are mixed and stirred thoroughly. After the stirring is completed, the mixture is washed with water and dried to obtain a conditioning and chemical agent.

7. A cold mix emulsified asphalt mixture according to claim 6, characterized in that: The mass fraction of the sodium silicate solution is 5-7%; the mass fraction of the chitosan solution is 3-5%.

8. The cold mix emulsified asphalt mixture according to claim 6, characterized in that: The mixing speed for sufficient mixing is 550-750 r / min, and the mixing is performed for 1-2 hours.

9. A method for preparing a cold-mixed emulsified asphalt mixture, characterized in that: The following steps are involved: The raw materials are weighed according to parts by weight, and then the raw materials are evenly mixed to obtain the cold-mix emulsified asphalt mixture of the present invention.

10. The method for preparing a cold mix emulsified asphalt mixture according to claim 9, characterized in that: The mixing step is 750-850 r / min, and the stirring time is 1-2 h.

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