High performance colored pervious asphalt concrete and method of making same

Abstract

The application discloses high-performance color permeable asphalt concrete and a preparation method thereof, and belongs to the technical field of asphalt concrete. The high-performance color permeable asphalt concrete is composed of color modified asphalt, aggregate, Portland cement and water. The high-performance color permeable asphalt concrete prepared by the application has a Marshall stability of 8.79-9.11 kN, a compressive strength of 59.8-62.0 MPa, water stability RMS of 97.6-99.2%, TSR of 96.9-98.6%, a void ratio of 19.6-21.7%, and a permeable coefficient of 64-70 mm / s.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of high-performance color permeable asphalt concrete and its preparation method, belong to asphalt concrete technical field. BACKGROUND

[0002] As a new type of pavement material, color permeable asphalt concrete is increasingly attracting attention due to its excellent water permeability, skid resistance and aesthetic appearance. Its open framework structure effectively realizes drainage, reducing the accumulation of rainwater, thereby reducing the risk of urban waterlogging. Color permeable asphalt concrete is generally composed of cement, asphalt, inorganic pigments and graded aggregate. After paving, it can effectively form a skeleton-void structure with a void ratio of 15-25%, which is much higher than that of ordinary asphalt concrete pavement. The skeleton-void structure is very beneficial to the direct infiltration of road surface water, which can supplement groundwater sources. It also has many advantages such as drainage, noise reduction and skid resistance. In order to form a water-permeable void, color permeable asphalt concrete must ensure a certain void ratio. Therefore, the coarse particle size of the graded aggregate in the composition ratio will be relatively large, which will have a serious negative impact on the compressive strength, shear strength and rutting resistance of color permeable asphalt concrete. Therefore, in order to maintain the durability of road performance and good water permeability, the performance requirements of color permeable asphalt concrete on asphalt are much higher than those of ordinary asphalt concrete.

[0003] Color permeable asphalt concrete often uses modified asphalt with relatively good performance. Modified asphalt generally has the following performance characteristics: (1) modified asphalt has good adhesion to aggregate and excellent anti-peeling performance; (2) modified asphalt should have sufficient toughness and elasticity as well as low-temperature cracking resistance; (3) modified asphalt should have good water stability; (4) it has a high softening point and high-temperature resistance, as well as sufficient aging resistance. Currently, the color permeable asphalt concrete used in China has the following outstanding problems: poor compressive strength, low Marshall stability, poor water stability, and unsatisfactory water permeability. The main reason is that the quality of modified asphalt is poor, which makes it difficult to maintain the road performance of high-porosity color permeable asphalt concrete.

[0004] Chinese patent CN118834040A discloses a kind of permeable color asphalt concrete and its preparation method, which is obtained by compounding modified decoloring asphalt, permeable color aggregate, inorganic colorant, additive and additive; wherein the permeable color aggregate is composite whisker coated recycled aggregate, and the composite whisker at least includes titanium oxide whisker. The high-performance color permeable asphalt concrete obtained by the patent has good water permeability, but the compressive strength is very poor, with a maximum compressive strength of only 35 MPa.

[0005] Chinese patent CN108751874A discloses a kind of high-performance color permeable asphalt concrete and its preparation method, raw materials include: asphalt, cement, coarse aggregate, fine aggregate, filler, water reducing agent, pigment, acrylic glue powder, water permeable material, reinforcing agent, water.The high-performance color permeable asphalt concrete prepared by the patent has a compressive strength less than 50MPa, and the water permeability is also poor.

[0006] As can be seen above, the current color permeable asphalt concrete still has the problems of low compressive strength, low Marshall stability, poor water stability and poor water permeability, so it is of great practical significance to develop a color permeable asphalt concrete with high compressive strength, high Marshall stability, good water stability and high water permeability. SUMMARY

[0007] To overcome the above-mentioned problems of the prior art, the present application provides a kind of high-performance color permeable asphalt concrete and its preparation method, to achieve the following purposes: high compressive strength, good Marshall stability, good water stability and excellent water permeability of color asphalt concrete are prepared.

[0008] To achieve the above-mentioned purposes, the present application adopts the following technical solutions:

[0009] A kind of high-performance color permeable asphalt concrete and its preparation method, the high-performance color permeable asphalt concrete is composed of color modified asphalt, aggregate, Portland cement and water;

[0010] The mass ratio of color modified asphalt, aggregate, Portland cement and water is 50~115:220~360:62~160:40~100;

[0011] The type of Portland cement is PO42.5;

[0012] The aggregate is graded stone;

[0013] The graded stone should meet the requirements in "Highway Asphalt Pavement Construction Technical Specification JTG F40-2004" and be graded according to the grading standard in "Highway Asphalt Pavement Construction Technical Specification JTG F40-2004";

[0014] The grading standard is that the percentage passing through a 26.5 mm sieve is 100 wt%, the percentage passing through a 19.0 mm sieve is 93-97 wt%, the percentage passing through a 13.2 mm sieve is 55-95 wt%, the percentage passing through a 9.5 mm sieve is 30-70 wt%, the percentage passing through a 4.75 mm sieve is 15-19 wt%, the percentage passing through a 2.36 mm sieve is 10-14 wt%, the percentage passing through a 1.18 mm sieve is 7-10 wt%, the percentage passing through a 0.6 mm sieve is 3-7 wt%, the percentage passing through a 0.3 mm sieve is 3-5 wt%, the percentage passing through a 0.15 mm sieve is 2-4 wt%, and the percentage passing through a 0.075 mm sieve is 2-3 wt%;

[0015] The colored modified asphalt is composed of road petroleum asphalt, modified rubber powder, modified calcium sulfate whisker, composite anti-peeling agent, and inorganic pigment;

[0016] The road petroleum asphalt, modified rubber powder, modified calcium sulfate whisker, composite anti-peeling agent, and inorganic pigment are respectively 300-480 parts by weight, 50-90 parts by weight, 20-60 parts by weight, 8-15 parts by weight, and 35-60 parts by weight;

[0017] The road petroleum asphalt is No. 70 asphalt or No. 90 asphalt specified in the Technical Specification for Construction of Highway Asphalt Pavement (JTGF40-2019);

[0018] The composite anti-peeling agent is composed of an amide substance and 1,3-diisopropyl urea;

[0019] The amide substance is one of glycylamide, 2-aminobutyramide, and N-isopropyl glycylamide or a mixture of two or more thereof in any mass ratio;

[0020] The mass ratio of the amide substance to 1,3-diisopropyl urea is 8-32:49;

[0021] The inorganic pigment is one of cobalt blue, manganese violet, red iron oxide, and yellow iron oxide;

[0022] The following is a further improvement on the above technical solution:

[0023] Step 1, preparation of modified rubber powder

[0024] After the rubber powder is fully dried, it is put into a high-speed shearing emulsifier, and then tung oil, hydroquinone, bisphenol A diglycidyl ether, and bisdimethylaminoethyl ether are added. The high-speed dispersion paddle is turned on, and the material in the high-speed shearing emulsifier is heated to a constant temperature. After uniform high-speed dispersion and shearing, the temperature is lowered to room temperature, and the modified rubber powder is obtained.

[0025] The rubber powder is waste tire rubber powder, and the particle size is 50-400 mesh;

[0026] The mass ratio of the rubber powder, tung oil, hydroquinone, bisphenol A diglycidyl ether, and bisdimethylaminoethyl ether is 340-570:100-260:15-35:15-30:7-19;

[0027] The drying is complete, the drying temperature is 60-75°C, and the drying time is 5-11 hours;

[0028] The constant temperature is 140-175°C;

[0029] The high-speed dispersion is uniform, the dispersion rate is 7000-10000 rpm, and the dispersion shear time is 2-4.5 hours.

[0030] Step 2, preparation of modified calcium sulfate whiskers

[0031] After the calcium sulfate whiskers are completely dried, they are placed in a reaction kettle, and then toluene and castor oil polyoxyethylene ether are added. After uniform dispersion by strong stirring, the temperature is increased to the reaction temperature under low-speed stirring, and propyl triethoxysilane isocyanate is added under condensation reflux. After complete reaction under low-speed stirring, an alcohol amide substance is added, and the reaction is completed after constant temperature stirring. Then, the temperature is decreased to room temperature, and the separated solid is washed and dried to obtain modified calcium sulfate whiskers;

[0032] The length of the calcium sulfate whiskers is 10-70 μm, and the diameter is 0.3-3 μm;

[0033] The alcohol amide substance is one of coconut oil diethanolamide, oleic acid diethanolamide, stearic acid diethanolamide, lauric acid diethanolamide, and tall oil diethanolamide, or a mixture of two or more thereof in any mass ratio;

[0034] The mass ratio of the calcium sulfate whiskers, toluene, castor oil polyoxyethylene ether, propyl triethoxysilane isocyanate, and alcohol amide substance is 95-190:250-480:3-8:8-19:15-35;

[0035] The drying is complete, the drying temperature is 90-130°C, and the drying time is 8-15 hours;

[0036] The strong stirring is uniform, the stirring rate is 4500-7000 rpm, and the stirring time is 8-16 hours;

[0037] The reaction temperature is 70-120°C;

[0038] The low-speed stirring rate is 1000-1500 rpm;

[0039] The low-speed stirring reaction is complete, and the reaction time is 5-9 hours;

[0040] The constant temperature stirring is until the reaction is complete, and the reaction time is 7-11 hours;

[0041] The washing is that the obtained solid is first washed with anhydrous ethanol for 1-3 times and then washed with deionized water for 1-3 times through centrifugal separation;

[0042] The drying is carried out at a drying temperature of 80-100 DEG C for 4-8 hours.

[0043] Step 3, preparation of color modified asphalt

[0044] According to the specific composition of the color modified asphalt by weight parts, first, the road petroleum asphalt, modified calcium sulfate whisker and modified rubber powder are put into a mixing kettle with a high-speed stirring paddle and a high-speed dispersing paddle, the high-speed stirring paddle is started, the stirring speed is controlled at 1500-3000 revolutions per minute, the kettle material is heated and kept at 145-175 DEG C, then the high-speed dispersing paddle is started, the dispersing speed is controlled at 6500-9000 revolutions per minute, and after 90-150 minutes of dispersing treatment, the composite anti-peeling agent and the inorganic pigment are added, and the dispersing treatment is continued for 80-140 minutes, then the high-speed dispersing paddle is closed and only the high-speed stirring paddle is kept, the stirring speed is controlled at 1000-1600 revolutions per minute, the temperature is lowered, and the material is discharged when the temperature is lowered to 85-100 DEG C, and then cooled to room temperature to obtain the color modified asphalt.

[0045] Step 4, preparation of high-performance color permeable asphalt concrete

[0046] The aggregate is graded in advance, and then the color modified asphalt, aggregate, Portland cement and water are added into the mixing kettle according to the mass ratio of the color modified asphalt, aggregate, Portland cement and water, the aggregate and Portland cement are mixed uniformly, then the color modified asphalt is added, the stirring speed is controlled at 1000-1500 revolutions per minute, the kettle material is heated and kept at 140-170 DEG C, and after 2-3.5 hours of stirring and mixing, the temperature is lowered to 90-98 DEG C, then the water is added, and after 2-3 hours of continuous stirring and mixing, the material is discharged to obtain the high-performance color permeable asphalt concrete.

[0047] Compared with the prior art, the present application has the following beneficial effects:

[0048] 1. This invention aims to improve the brittleness of asphalt, enhance the adhesion between asphalt and aggregates, and increase the toughness of asphalt. It introduces modified rubber powder to address these defects. The microstructure of rubber powder is generally a three-dimensional network of rubber polymers formed by vulcanization and cross-linking, and most are filled with carbon black. This composition results in very weak polarity of the rubber powder, creating a compatibility barrier between it and the relatively polar asphalt. To improve the polarity of the rubber powder, this invention uses highly polar tung oil. Simultaneously, it utilizes high-shear dispersion equipment and a high reaction temperature, taking advantage of the swelling capacity of tung oil on the polymers, to thermally swell and degrade the rubber powder particles under high shear. Under the swelling effect of tung oil and the action of high-temperature, high-speed shear, the vulcanization and cross-linking network inside the rubber powder de-crosslinks, the molecular chains of the rubber polymer break to a certain extent, and the carbon black particles are released to a certain degree. During the decrosslinking and molecular chain breakage process, the rubber polymer molecular chains will generate a certain number of polar functional groups due to high-temperature oxidation. In addition, tung oil itself also contains polar ester functional groups. These polar functional groups react with bisphenol A diglycidyl ether under high temperature and catalysis of dimethylaminoethyl ether, which will greatly enhance the polarity of the rubber powder particles. In addition, in order to avoid excessive thermal degradation of the rubber powder particles, hydroquinone with reducing properties is added to avoid excessive thermal oxidative degradation of the rubber powder particles. The quinone substances generated by the oxidation of hydroquinone have good compatibility with asphalt molecules, which will also increase the compatibility between rubber powder and asphalt to a certain extent. Furthermore, the free carbon black released from the pyrolysis of rubber powder particles will generate some oxygen-containing polar functional groups (such as hydroxyl and carboxyl groups) on the surface of the carbon black particles in the above-mentioned high-temperature reaction environment. These functional groups can promote the compatibility between carbon black particles and asphalt matrix.

[0049] 2. This invention uses calcium sulfate whiskers to enhance the mechanical properties of asphalt matrix. Calcium sulfate whiskers have very strong surface polarity and poor compatibility with asphalt itself. To promote the uniform dispersion of calcium sulfate whiskers in the asphalt matrix, this invention first uses the surfactant castor oil polyoxyethylene ether to disperse calcium sulfate whiskers in toluene solvent, and then uses propyltriethoxysilane isocyanate to modify the surface of the calcium sulfate whiskers. After this modification, the surface of the calcium sulfate whiskers is covered with isocyanate groups and ethoxysilane groups. Then, surface-active alcohol amides are added, and finally the surface of the calcium sulfate whiskers is covered with alcohol amides with long carbon chains and surface activity. This greatly enhances the compatibility of calcium sulfate whiskers with the asphalt matrix, ultimately ensuring the uniform dispersion of calcium sulfate whiskers in the asphalt matrix, so that calcium sulfate whiskers play a very significant role in strengthening and toughening the final concrete product.

[0050] 3、The composite anti-stripping agent added by the application is composed of amide substances and 1,3-diisopropyl urea, wherein the amide substances mainly include glycine amide, 2-aminobutyric amide and N-isopropyl glycine amide, the three substances cooperate with 1,3-diisopropyl urea to enhance the adhesion between the asphalt matrix and the aggregate and the concrete particles, and the principle is that the ends or periphery of asphalt molecules are mostly acidic carboxyl, phenolic hydroxyl, ester groups and other polar functional groups, the amide substances and 1,3-diisopropyl urea in the composite anti-stripping agent can have hydrogen bond adsorption effect with the polar functional groups of the asphalt matrix, and the surface of the inorganic aggregate is mostly covered by the polar hydroxyl functional groups, so the composite anti-stripping agent and the surface of the aggregate can also have a certain degree of hydrogen bond adsorption effect, so the composite anti-stripping agent plays a bridging role between the asphalt and the aggregate, and further enhances the adhesion between the aggregate and the asphalt, and finally improves the various road performances of the high-performance colored permeable asphalt concrete;

[0051] 4, The high-performance colored permeable asphalt concrete prepared by the application has a Marshall stability of 8.79~9.11kN, a compressive strength of 59.8~62.0MPa, a water stability RMS of 97.6~99.2%, a TSR of 96.9~98.6%, a void ratio of 19.6~21.7%, and a permeable coefficient of 64~70mm / s. DETAILED DESCRIPTION

[0052] The preferred embodiments of the application are described below, and it should be understood that the preferred embodiments described herein are only used to illustrate and explain the application, and are not used to limit the application.

[0053] Embodiment 1: A preparation method of high-performance colored permeable asphalt concrete

[0054] Step 1, preparation of modified rubber powder

[0055] After the rubber powder is fully dried, it is put into a high-speed shearing emulsifier, and then tung oil, hydroquinone, bisphenol A diglycidyl ether and bisdimethylaminoethyl ether are added, the high-speed dispersion paddle is started, and the material in the high-speed shearing emulsifier is heated to a constant temperature, and then uniformly dispersed and sheared at a constant temperature, and then cooled to room temperature, and then discharged to obtain the modified rubber powder;

[0056] The rubber powder is waste tire rubber powder, and the particle size is 100 mesh;

[0057] The mass ratio of the rubber powder, tung oil, hydroquinone, bisphenol A diglycidyl ether and bisdimethylaminoethyl ether is 470:160:25:20:11;

[0058] The drying is sufficient, the drying temperature is 70℃, and the drying time is 8 hours;

[0059] The constant temperature is 155℃.

[0060] The high-speed dispersion shear is uniform, the dispersion rate is 9000 rpm, and the dispersion shear time is 3 hours.

[0061] Step 2, preparation of modified calcium sulfate whiskers

[0062] After the calcium sulfate whiskers are completely dried, they are placed in a reaction kettle, then toluene and castor oil polyoxyethylene ether are added, and after uniform dispersion by strong stirring, the temperature is raised to the reaction temperature under low-speed stirring, and propyl triethoxysilane isocyanate is added under condensation reflux, and after complete reaction under low-speed stirring, an alcohol amide substance is added, and after complete reaction under constant temperature stirring, the temperature is lowered to room temperature, and the separated solid is washed and dried to obtain modified calcium sulfate whiskers;

[0063] The length of the calcium sulfate whiskers is 40 μm, and the diameter is 1 μm;

[0064] The alcohol amide substance is coconut oil diethanolamide;

[0065] The mass ratio of the calcium sulfate whiskers, toluene, castor oil polyoxyethylene ether, propyl triethoxysilane isocyanate, and alcohol amide substance is 140:380:5:11:28;

[0066] The drying is complete, the drying temperature is 110°C, and the drying time is 11 hours;

[0067] The strong stirring for uniform dispersion is at a stirring rate of 6000 rpm for 13 hours;

[0068] The reaction temperature is 90°C;

[0069] The low-speed stirring is at a stirring rate of 1200 rpm;

[0070] The low-speed stirring reaction is complete, and the reaction time is 8 hours;

[0071] The constant temperature stirring is complete, and the reaction time is 8 hours;

[0072] The washing is performed by washing the obtained solid with anhydrous ethanol for 2 times and then with deionized water for 2 times;

[0073] The drying is performed at a drying temperature of 90°C for 7 hours.

[0074] Step 3, preparation of color-modified asphalt

[0075] The specific composition of the color modified asphalt is 380 parts of road petroleum asphalt, 80 parts of modified rubber powder, 50 parts of modified calcium sulfate whisker, 12 parts of composite anti-peeling agent, and 50 parts of inorganic pigment by weight.

[0076] The specific composition of the color modified asphalt is 380 parts of road petroleum asphalt, 80 parts of modified rubber powder, 50 parts of modified calcium sulfate whisker, 12 parts of composite anti-peeling agent, and 50 parts of inorganic pigment by weight.

[0077] The road petroleum asphalt is No. 70 asphalt meeting the requirements of JTGF40-2019 "Technical Specification for Construction of Highway Asphalt Pavement".

[0078] The composite anti-peeling agent is composed of an amide substance and 1,3-diisopropyl urea.

[0079] The amide substance is glycine amide.

[0080] The mass ratio of the amide substance and 1,3-diisopropyl urea is 20:49.

[0081] The inorganic pigment is cobalt blue.

[0082] Step 4, preparation of high-performance color permeable asphalt concrete

[0083] The aggregate is graded in advance, and then the color modified asphalt, aggregate, Portland cement, and water are added into the mixing kettle according to the feeding mass ratio. After mixing uniformly, the color modified asphalt is added, the material in the kettle is heated and kept at 160℃, and stirred and mixed for 3 hours. After cooling to 95℃, water is added, and stirring and mixing are continued for 2.6 hours, and then the material is discharged to obtain high-performance color permeable asphalt concrete.

[0084] The feeding mass ratio of the color modified asphalt, aggregate, Portland cement, and water is 75:260:120:80.

[0085] The type of the Portland cement is PO42.5.

[0086] The aggregate is graded stone.

[0087] The graded stone should meet the provisions in the Technical Specification for Construction of Highway Asphalt Pavement JTG F40-2004 and be graded according to the grading standard in the Technical Specification for Construction of Highway Asphalt Pavement JTG F40-2004;

[0088] The grading standard is that the percentage passing through a 26.5mm sieve is 100wt%, the percentage passing through a 19.0mm sieve is 95wt%, the percentage passing through a 13.2mm sieve is 85wt%, the percentage passing through a 9.5mm sieve is 60wt%, the percentage passing through a 4.75mm sieve is 18wt%, the percentage passing through a 2.36mm sieve is 13wt%, the percentage passing through a 1.18mm sieve is 8wt%, the percentage passing through a 0.6mm sieve is 6wt%, the percentage passing through a 0.3mm sieve is 4wt%, the percentage passing through a 0.15mm sieve is 3wt%, and the percentage passing through a 0.075mm sieve is 2.6wt%.

[0089] Embodiment 2: A preparation method of high-performance colored permeable asphalt concrete

[0090] Step 1, preparation of modified rubber powder

[0091] After the rubber powder is fully dried, it is put into a high-speed shearing emulsifier, and then tung oil, hydroquinone, bisphenol A diglycidyl ether and bisdimethylaminoethyl ether are added. The high-speed dispersion paddle is turned on, and the material in the high-speed shearing emulsifier is heated to a constant temperature. After uniform high-speed dispersion and shearing, the temperature is lowered to room temperature, and the modified rubber powder is obtained.

[0092] The rubber powder is waste tire rubber powder, and the particle size is 50 mesh.

[0093] The mass ratio of the rubber powder, tung oil, hydroquinone, bisphenol A diglycidyl ether and bisdimethylaminoethyl ether is 340:100:15:15:7.

[0094] The drying is sufficient, the drying temperature is 60℃, and the drying time is 5 hours.

[0095] The constant temperature is 140℃.

[0096] The high-speed dispersion and shearing are uniform, the dispersion rate is 7000r / min, and the dispersion and shearing time is 2 hours.

[0097] Step 2, preparation of modified calcium sulfate whisker

[0098] After the calcium sulfate whisker is completely dried, it is put into a reaction kettle, then toluene and castor oil polyoxyethylene ether are added, and the mixture is uniformly dispersed by strong stirring, then the temperature is increased to the reaction temperature under low-speed stirring, propyl triethoxy silane isocyanate is added under the condition of condensation reflux, and after the reaction is completed under low-speed stirring, an alcohol amide substance is added, and after the reaction is completed under constant temperature stirring, the temperature is decreased to room temperature, centrifugal separation is performed, and after the separated solid is washed and dried, a modified calcium sulfate whisker is obtained;

[0099] The length of the calcium sulfate whisker is 10 μm, and the diameter is 0.3 μm;

[0100] The alcohol amide substance is oleic acid diethanol amide;

[0101] The mass ratio of the calcium sulfate whisker, toluene, castor oil polyoxyethylene ether, propyl triethoxy silane isocyanate and alcohol amide substance is 95:250:3:8:15;

[0102] The drying is complete, and the drying temperature is 90 ℃, and the drying time is 8 hours;

[0103] The uniform dispersion is performed by strong stirring, and the stirring rate is 4500 revolutions per minute, and the stirring time is 8 hours;

[0104] The reaction temperature is 70 ℃;

[0105] The low-speed stirring is performed, and the stirring rate is 1000 revolutions per minute;

[0106] The low-speed stirring reaction is complete, and the reaction time is 5 hours;

[0107] The constant temperature stirring is performed until the reaction is complete, and the reaction time is 7 hours;

[0108] The washing is performed by first washing the obtained solid by centrifugal separation with anhydrous ethanol once and then washing it with deionized water once;

[0109] The drying is performed at a drying temperature of 80 ℃ for 4 hours.

[0110] Step 3, preparation of color modified asphalt

[0111] The specific composition of the color modified asphalt is 300 parts of road petroleum asphalt, 50 parts of modified rubber powder, 20 parts of modified calcium sulfate whisker, 8 parts of composite anti-peeling agent, and 35 parts of inorganic pigment by weight.

[0112] The specific composition of the color modified asphalt is 300 parts of road petroleum asphalt, 50 parts of modified rubber powder, 20 parts of modified calcium sulfate whisker, 8 parts of composite anti-peeling agent, and 35 parts of inorganic pigment by weight.

[0113] The road petroleum asphalt is No. 90 asphalt meeting the requirements of JTGF40-2019 "Technical Specification for Highway Asphalt Pavement Construction".

[0114] The composite anti-peeling agent is composed of an amide substance and 1,3-diisopropyl urea.

[0115] The amide substance is 2-aminobutyric amide.

[0116] The mass ratio of the amide substance and 1,3-diisopropyl urea is 8:49.

[0117] The inorganic pigment is manganese purple.

[0118] Step 4, preparation of high-performance color permeable asphalt concrete

[0119] The aggregate is graded in advance, and then the color modified asphalt, aggregate, Portland cement, and water are added to the mixing kettle according to the feeding mass ratio. After mixing uniformly, the color modified asphalt is added, the stirring speed is controlled at 1000 rpm, the kettle material is heated and kept at 140℃, and stirred for 2 hours. After cooling to 90℃, water is added, and the mixture is stirred for another 2 hours. The high-performance color permeable asphalt concrete is obtained.

[0120] The feeding mass ratio of the color modified asphalt, aggregate, Portland cement, and water is 50:220:62:40.

[0121] The type of the Portland cement is PO42.5.

[0122] The aggregate is graded stone.

[0123] The graded stone should meet the provisions in the Technical Specification for Construction of Highway Asphalt Pavement JTG F40-2004 and be graded according to the grading standard in the Technical Specification for Construction of Highway Asphalt Pavement JTG F40-2004;

[0124] The grading standard is that the percentage passing through a 26.5mm sieve is 100wt%, the percentage passing through a 19.0mm sieve is 93wt%, the percentage passing through a 13.2mm sieve is 55wt%, the percentage passing through a 9.5mm sieve is 30wt%, the percentage passing through a 4.75mm sieve is 15wt%, the percentage passing through a 2.36mm sieve is 10wt%, the percentage passing through a 1.18mm sieve is 7wt%, the percentage passing through a 0.6mm sieve is 3wt%, the percentage passing through a 0.3mm sieve is 3wt%, the percentage passing through a 0.15mm sieve is 2wt%, and the percentage passing through a 0.075mm sieve is 2wt%.

[0125] Embodiment 3: A preparation method of high-performance colored permeable asphalt concrete

[0126] Step 1, preparation of modified rubber powder

[0127] After the rubber powder is fully dried, it is placed in a high-speed shearing emulsifier, and then tung oil, hydroquinone, bisphenol A diglycidyl ether and bisdimethylaminoethyl ether are added. The high-speed dispersion paddle is turned on, and the material in the high-speed shearing emulsifier is heated to a constant temperature. After uniform high-speed dispersion and shearing, the temperature is lowered to room temperature, and the modified rubber powder is obtained.

[0128] The rubber powder is waste tire rubber powder with a particle size of 400 mesh;

[0129] The mass ratio of the rubber powder, tung oil, hydroquinone, bisphenol A diglycidyl ether and bisdimethylaminoethyl ether is 570:260:35:30:19;

[0130] The drying is sufficient, the drying temperature is 75℃, and the drying time is 11 hours;

[0131] The constant temperature is 175℃;

[0132] The high-speed dispersion and shearing are uniform, the dispersion rate is 10000 revolutions per minute, and the dispersion and shearing time is 4.5 hours.

[0133] Step 2, preparation of modified calcium sulfate whisker

[0134] After the calcium sulfate whisker is completely dried, it is put into a reaction kettle, then toluene and castor oil polyoxyethylene ether are added, and the mixture is uniformly dispersed by strong stirring, then the temperature is increased to the reaction temperature under low-speed stirring, and propyl triethoxy silane isocyanate is added under the condition of condensation reflux, then the reaction is completed under low-speed stirring, then alcohol amide is added, and the reaction is completed under constant temperature stirring, then the temperature is decreased to room temperature, and the obtained solid is separated by centrifugation, and then washed and dried to obtain modified calcium sulfate whisker;

[0135] The length of the calcium sulfate whisker is 70 μm, and the diameter is 3 μm;

[0136] The alcohol amide is stearic acid diethanol amide;

[0137] The mass ratio of the calcium sulfate whisker, toluene, castor oil polyoxyethylene ether, propyl triethoxy silane isocyanate and alcohol amide is 190:480:8:19:35;

[0138] The drying is completed, the drying temperature is 130 ℃, and the drying time is 15 hours;

[0139] The strong stirring is uniformly dispersed, the stirring rate is 7000 rpm, and the stirring time is 16 hours;

[0140] The reaction temperature is 120 ℃;

[0141] The low-speed stirring is at a stirring rate of 1500 rpm;

[0142] The low-speed stirring reaction is completed, and the reaction time is 9 hours;

[0143] The constant temperature stirring is completed, and the reaction time is 11 hours;

[0144] The washing is performed by washing the obtained solid with anhydrous ethanol for 3 times and then with deionized water for 3 times;

[0145] The drying is performed at a drying temperature of 100 ℃ for 8 hours.

[0146] Step 3, preparation of color modified asphalt

[0147] The specific composition of the color modified asphalt is 480 parts of road petroleum asphalt, 90 parts of modified rubber powder, 60 parts of modified calcium sulfate whisker, 15 parts of composite anti-peeling agent, and 60 parts of inorganic pigment by weight;

[0148] The specific composition of the color modified asphalt is 480 parts of road petroleum asphalt, 90 parts of modified rubber powder, 60 parts of modified calcium sulfate whisker, 15 parts of composite anti-peeling agent, and 60 parts of inorganic pigment by weight;

[0149] The road petroleum asphalt is No. 70 asphalt specified in the Technical Specification for Construction of Highway Asphalt Pavement (JTGF40-2019);

[0150] The composite anti-peeling agent is composed of an amide substance and 1,3-diisopropyl urea;

[0151] The amide substance is a mixture of one or more than two of glycylamide, 2-aminobutyramide, and N-isopropyl glycylamide in any mass ratio;

[0152] The mass ratio of the amide substance to 1,3-diisopropyl urea is 32:49;

[0153] The inorganic pigment is red iron oxide.

[0154] Step 4, preparation of high-performance color permeable asphalt concrete

[0155] The aggregate is graded in advance, and then the color modified asphalt, aggregate, Portland cement, and water are added into the mixing kettle in the mass ratio of 115:360:160:100. After mixing uniformly, the color modified asphalt is added, the temperature of the materials in the kettle is raised and kept at 170℃, and stirring and mixing are performed for 3.5 hours. Then the temperature is lowered to 98℃, and the water is added. After stirring and mixing for another 3 hours, the high-performance color permeable asphalt concrete is obtained.

[0156] The specific composition of the color modified asphalt is 480 parts of road petroleum asphalt, 90 parts of modified rubber powder, 60 parts of modified calcium sulfate whisker, 15 parts of composite anti-peeling agent, and 60 parts of inorganic pigment by weight;

[0157] The type of the Portland cement is PO42.5;

[0158] The aggregate is graded stone;

[0159] The graded stone should meet the provisions in the Technical Specification for Construction of Highway Asphalt Pavement JTG F40-2004 and be graded according to the grading standard in the Technical Specification for Construction of Highway Asphalt Pavement JTG F40-2004;

[0160] The grading standard is that the percentage passing through a 26.5 mm sieve is 100 wt%, the percentage passing through a 19.0 mm sieve is 97 wt%, the percentage passing through a 13.2 mm sieve is 95 wt%, the percentage passing through a 9.5 mm sieve is 70 wt%, the percentage passing through a 4.75 mm sieve is 19 wt%, the percentage passing through a 2.36 mm sieve is 14 wt%, the percentage passing through a 1.18 mm sieve is 10 wt%, the percentage passing through a 0.6 mm sieve is 7 wt%, the percentage passing through a 0.3 mm sieve is 5 wt%, the percentage passing through a 0.15 mm sieve is 4 wt%, and the percentage passing through a 0.075 mm sieve is 3 wt%.

[0161] Example 4: A preparation method of high-performance colored permeable asphalt concrete

[0162] Step 1 is operated as in Example 1;

[0163] Step 2, preparation of modified calcium sulfate whiskers

[0164] The alcohol amide substance is lauric acid diethanolamide, and other operations are as in Example 1;

[0165] Step 3, preparation of colored modified asphalt

[0166] The inorganic pigment is iron oxide yellow, and other operations are as in Example 1;

[0167] Step 4 is operated as in Example 1.

[0168] Example 5: A preparation method of high-performance colored permeable asphalt concrete

[0169] Step 1 is operated as in Example 1;

[0170] Step 2, preparation of modified calcium sulfate whiskers

[0171] The alcohol amide substance is tall oil diethanolamide, and other operations are as in Example 1;

[0172] Steps 3 and 4 are operated as in Example 1.

[0173] Comparative Example 1: On the basis of Example 1, in Step 1, preparation of modified rubber powder, no hydroquinone, bisphenol A diglycidyl ether, bisdimethylaminoethyl ether is added, 25 parts of hydroquinone, 20 parts of bisphenol A diglycidyl ether, 11 parts of bisdimethylaminoethyl ether, a total of 56 parts of the above three substances, are replaced by 42 parts of rubber powder and 14 parts of tung oil in the approximate ratio of 470:160, and the specific operation is as follows:

[0174] Step 1, preparation of modified rubber powder

[0175] 45 parts of hydroquinone, 20 parts of bisphenol A diglycidyl ether, 11 parts of bisdimethylaminoethyl ether are replaced by 57 parts of rubber powder and 19 parts of tung oil, and other operations are the same as in Example 1.

[0176] Steps 2, 3, and 4 are the same as in Example 1.

[0177] Comparative Example 2: On the basis of Example 1, in Step 2, preparation of modified calcium sulfate whiskers, no alcohol amide is added for modification, and the specific operation is as follows:

[0178] Step 1 is the same as in Example 1;

[0179] Step 2, preparation of modified calcium sulfate whiskers

[0180] After the calcium sulfate whiskers are completely dried, they are placed in a reaction kettle, then toluene and castor oil polyoxyethylene ether are added, and after strong stirring and uniform dispersion, the temperature is raised to the reaction temperature under low-speed stirring. Isocyanate propyl triethoxy silane is added under condensation reflux, and after complete reaction under low-speed stirring, the temperature is lowered to room temperature, and the separated solid is washed and dried to obtain modified calcium sulfate whiskers, and other operations are the same as in Example 1.

[0181] Steps 3 and 4 are the same as in Example 1.

[0182] Comparative Example 3: On the basis of Example 1, in Step 3, preparation of colored modified asphalt, no composite anti-peeling agent is added, 12 parts of composite anti-peeling agent are replaced by 12 parts of rubber powder, and the specific operation is as follows:

[0183] Steps 1 and 2 are the same as in Example 1;

[0184] Step 3, preparation of colored modified asphalt

[0185] 12 parts of composite anti-peeling agent are replaced by 12 parts of rubber powder, and other operations are the same as in Example 1.

[0186] Step 4 is the same as in Example 1.

[0187] Performance test:

[0188] According to the test method in JTG-E20-2011 "Highway Engineering Asphalt and Asphalt Mixture Test Procedures", the high-performance colored permeable asphalt concrete obtained in Examples 1, 2, 3, 4, 5 and Comparative Examples 1, 2, 3 is tested for Marshall stability, compressive strength, water stability, void ratio and permeability coefficient, etc. Among them, the water stability is evaluated by immersion Marshall residual stability (RMS) and freeze-thaw splitting residual strength ratio (TSR), and the results are shown in Table 1:

[0189]

[0190] As can be seen from the test results in Table 1, the Marshall stability of Examples 1-5 is higher than 8.7 kN, the compressive strength is higher than 59 MPa, the RMS and TSR of water stability are higher than 96%, the void ratio is around 20%, and the permeability coefficient is higher than 64 mm / s, which shows that the high-performance colored permeable asphalt concrete obtained by the present application has very excellent road performance, and also has very good durability and excellent permeability; In the preparation of modified rubber powder in Comparative Example 1, no hydroquinone, bisphenol A diglycidyl ether or bisdimethylaminoethyl ether is added, the Marshall stability, compressive strength and water stability of Comparative Example 1 are all sharply decreased, the void ratio is significantly increased, and the permeability coefficient is significantly increased, which shows that hydroquinone, bisphenol A diglycidyl ether and bisdimethylaminoethyl ether can react with rubber powder in the process of rubber powder modification, increase the chemical polarity of rubber powder, promote the compatibility of rubber powder and asphalt, and thus maximize the toughness of modified asphalt and the adhesion between asphalt and aggregate and concrete, and finally improve the road performance of colored permeable asphalt concrete; In the preparation of modified calcium sulfate whisker in Comparative Example 2, no alcohol amide is added for modification, the Marshall stability, compressive strength and water stability of Comparative Example 2 are all significantly reduced, and the void ratio and permeability coefficient are also increased to a certain extent, which shows that if no alcohol amide is added in the modification process of calcium sulfate whisker, the dispersion uniformity of calcium sulfate whisker in modified asphalt will be affected, which will affect the toughening and reinforcing effect of calcium sulfate whisker on high-performance colored permeable asphalt concrete, resulting in a sharp decrease in the road performance of high-performance colored permeable asphalt concrete; In the preparation of colored modified asphalt in Comparative Example 3, no composite anti-peeling agent is added, the Marshall stability, compressive strength and water stability of Comparative Example 3 are all significantly reduced, and the void ratio and permeability coefficient do not change significantly, which shows that the composite anti-peeling agent can greatly improve the mechanical properties of high-performance colored permeable asphalt concrete, so that it has very excellent road performance, and the composite anti-peeling agent mainly plays a role in enhancing the adhesion between aggregate and modified asphalt, avoiding large displacement between asphalt matrix and aggregate under road conditions such as load, water immersion and strong vibration, so the composite anti-peeling agent can greatly improve the road durability of colored permeable asphalt concrete.

[0191] The above description is only the preferred embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent substitutions or changes according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A high-performance colored permeable asphalt concrete, characterized in that: the high-performance colored permeable asphalt concrete is composed of colored modified asphalt, aggregate, Portland cement, water; the mass ratio of the colored modified asphalt, aggregate, Portland cement, water is 50-115:220-360:62-160:40-100; the colored modified asphalt is composed of road petroleum asphalt, modified rubber powder, modified calcium sulfate whisker, composite anti-peeling agent, inorganic pigment; the road petroleum asphalt, modified rubber powder, modified calcium sulfate whisker, composite anti-peeling agent, inorganic pigment are respectively 300-480 parts, 50-90 parts, 20-60 parts, 8-15 parts, 35-60 parts by weight; the composite anti-peeling agent is composed of amide and 1,3-diisopropyl urea; the modified rubber powder is prepared by adding rubber powder, tung oil, hydroquinone, bisphenol A diglycidyl ether and bisdimethylaminoethyl ether into a high-speed shearing emulsifier, uniformly dispersing and shearing at constant temperature, and then discharging after cooling to room temperature; the modified calcium sulfate whisker is prepared by adding calcium sulfate whisker, toluene and castor oil polyoxyethylene ether into a reaction kettle, uniformly dispersing and stirring, heating to the reaction temperature under low-speed stirring, then adding propyl triethoxysilane isocyanate, and after the reaction is complete, adding alcohol amide, and after the reaction is complete, cooling to room temperature, and then centrifuging, washing and drying to obtain the modified calcium sulfate whisker.

2. The high-performance colored permeable asphalt concrete according to claim 1, characterized in that: the amide is one or more than two of glycine amide, 2-aminobutyric amide, N-isopropyl glycine amide in any mass ratio; the alcohol amide is one or more than two of coconut oil diethanol amide, oleic acid diethanol amide, stearic acid diethanol amide, lauric acid diethanol amide, tall oil diethanol amide in any mass ratio; the road petroleum asphalt is No. 70 or No. 90 asphalt in accordance with the provisions of JTGF40-2019 “Technical Code for Construction of Highway Asphalt Pavement”.

3. The high-performance colored permeable asphalt concrete according to claim 1, characterized in that: the mass ratio of the amide and 1,3-diisopropyl urea is 8-32:49; the inorganic pigment is one of cobalt blue, manganese violet, iron oxide red and iron oxide yellow.

4. The high-performance colored permeable asphalt concrete according to claim 1, characterized in that: the rubber powder is waste tire rubber powder with a particle size of 50-400 mesh; the mass ratio of the rubber powder, tung oil, hydroquinone, bisphenol A diglycidyl ether and bisdimethylaminoethyl ether is 340-570:100-260:15-35:15-30:7-19.

5. The high-performance colored permeable asphalt concrete according to claim 1, characterized in that: the length of the calcium sulfate whisker is 10-70 μm, and the diameter is 0.3-3 μm. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The mass ratio of the calcium sulfate whisker, toluene, castor oil polyoxyethylene ether, isocyanic acid propyl triethoxy silane, and alcohol amide is 95-190:250-480:3-8:8-19:15-35. 6.The high-performance colored permeable asphalt concrete of claim 1, wherein: The colored modified asphalt is prepared by the following method: first, put the road petroleum asphalt, modified calcium sulfate whisker, and modified rubber powder into a mixing kettle with a high-speed stirring paddle and a high-speed dispersing paddle, and then open the high-speed stirring paddle, control the stirring speed at 1500-3000 revolutions per minute, and heat and maintain the temperature of the materials in the kettle at 145-175℃; then open the high-speed dispersing paddle, control the dispersing speed at 6500-9000 revolutions per minute, and disperse for 90-150 minutes; then add the composite anti-peeling agent and inorganic pigment, continue to disperse for 80-140 minutes, and then close the high-speed dispersing paddle and only keep the high-speed stirring paddle, control the stirring speed at 1000-1600 revolutions per minute, and cool down; when the temperature drops to 85-100℃, discharge the materials; after cooling to room temperature, the colored modified asphalt is obtained. 7.The preparation method of the high-performance colored permeable asphalt concrete of claim 1, wherein: The aggregate is graded in advance, and then the colored modified asphalt, aggregate, Portland cement, and water are added into the mixing kettle according to the mass ratio of the materials; after mixing uniformly, the colored modified asphalt is added, the stirring speed is controlled at 1000-1500 revolutions per minute, the materials in the kettle are heated and maintained at 140-170℃, and stirred and mixed for 2-3.5 hours; then the temperature is lowered to 90-98℃, and the water is added; after stirring and mixing for another 2-3 hours, the materials are discharged, and the high-performance colored permeable asphalt concrete is obtained.

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