Permeable colored asphalt concrete and preparation method thereof

Abstract

The invention relates to water-permeable colored asphalt concrete and a preparation method thereof, and belongs to the technical field of asphalt concrete.The water-permeable colored asphalt concrete is composed of colored modified asphalt and aggregate, and the mass ratio of the colored modified asphalt to the aggregate is (1-2): 10. The colored modified asphalt is composed of road petroleum asphalt, modified calcium carbonate whiskers, modified rubber powder, a composite anti-stripping agent and an inorganic pigment. According to the permeable colored asphalt concrete prepared by the invention, the Marshall stability is 8.39 to 8.91 kN, the compressive strength is 57.9 to 64.5 MPa, the water stability RMS is 97.5 to 98.4 percent, the TSR is 95.2 to 97.0 percent, the porosity is 18.4 to 21.6 percent, and the permeability coefficient is 61 to 70 mm / s.

Description

Technical Field

[0001] The invention relates to permeable colored asphalt concrete and a preparation method thereof, belonging to the technical field of asphalt concrete. Background Art

[0002] Permeable asphalt concrete adopts a skeleton-void structure with a void ratio of about 15~25%. The permeable pavement structure allows surface water to directly infiltrate and replenish groundwater sources. It also has many advantages such as drainage, noise reduction and anti-skid performance. In order to form permeable voids and maintain a sufficiently high void ratio, the proportion of coarse aggregate in the formula of permeable asphalt concrete is relatively large, which will have a serious negative impact on the compressive strength, shear strength and rutting resistance of permeable asphalt concrete. Therefore, in order to maintain the durability of road performance and good permeability, the requirements of permeable asphalt concrete on asphalt performance are much higher than those of ordinary asphalt concrete.

[0003] Modified asphalt with relatively good performance is commonly used in permeable asphalt concrete formulas. Modified asphalt generally has the following performance characteristics: (1) Modified asphalt has good adhesion to aggregates and excellent anti-stripping 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. At present, due to the unsatisfactory quality of modified asphalt, the permeable asphalt concrete used in China still has outstanding problems such as poor compressive strength, low Marshall stability, poor water resistance stability, and unsatisfactory permeability. In addition, the color of permeable asphalt concrete is relatively single, which makes it difficult to meet the requirements of various road surfaces for color diversity.

[0004] Chinese patent CN108751874A discloses a high-performance colored permeable asphalt concrete and a preparation method thereof, wherein the raw materials of the high-performance colored permeable asphalt concrete include asphalt, cement, coarse aggregate, fine aggregate, filler, water reducer, pigment, acrylic rubber powder, permeable material, reinforcing agent, and water. The colored permeable asphalt concrete obtained in the patent has a maximum compressive strength of only 49.9MPa, and a relatively low permeability coefficient.

[0005] Chinese patent CN118834040A discloses a water-permeable colored asphalt concrete and its preparation method, which is prepared by compounding modified decolorized asphalt, water-permeable colored aggregate, inorganic colorant, auxiliary agent and additive; the water-permeable colored aggregate is a composite whisker-coated recycled aggregate, and the composite whisker at least includes titanium oxide whisker. The water-permeable colored asphalt concrete prepared by this patent has a maximum compressive strength of only 35MPa, which is only suitable for low-load pavement and has a very limited scope of use.

[0006] From the above, it can be seen that the current permeable asphalt concrete still has prominent problems such as poor compressive strength, low Marshall stability, poor water resistance, unsatisfactory permeability and relatively single color. Therefore, it is of great practical value to develop colored permeable asphalt concrete with high compressive strength, high Marshall stability, good water resistance and high permeability. Summary of the invention

[0007] In view of the deficiencies in the above-mentioned prior art, the present invention provides a permeable colored asphalt concrete and a preparation method thereof, so as to achieve the following invention objectives: to prepare colored asphalt concrete with high compressive strength, high Marshall stability, good water resistance and stability, excellent permeability and rich colors.

[0008] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions: A permeable colored asphalt concrete and a preparation method thereof, wherein the permeable colored asphalt concrete is composed of colored modified asphalt and aggregate, and the mass ratio of the colored modified asphalt to the aggregate is 1-2:10; The aggregate is a stone material that meets the grading standard of "Technical Specification for Highway Asphalt Pavement Construction JTG F40-2004", and the grading method is: the percentage passing through the 26.5mm sieve hole is 100wt%, the percentage passing through the 19.0mm sieve hole is 93-97wt%, the percentage passing through the 13.2mm sieve hole is 55-95wt%, the percentage passing through the 9.5mm sieve hole is 30-70wt%, the percentage passing through the 4.75mm sieve hole is 15-19wt%, the percentage passing through the 2.36mm sieve hole is 10-14wt%, the percentage passing through the 1.18mm sieve hole is 7-10wt%, the percentage passing through the 0.6mm sieve hole is 3-7wt%, the percentage passing through the 0.3mm sieve hole is 3-5wt%, the percentage passing through the 0.15mm sieve hole is 2-4wt%, and the percentage passing through the 0.075mm sieve hole is 2-3wt%; The specific formula of the colored modified asphalt is, in parts by weight: 220~300 parts of road petroleum asphalt, Modified calcium carbonate whisker 15~45 parts, Modified rubber powder 25~60 parts, 5~10 parts of composite anti-stripping agent, Inorganic pigment 25~40 parts; The road petroleum asphalt is No. 70 asphalt or No. 90 asphalt specified in JTGF40-2019 "Technical Specifications for Highway Asphalt Pavement Construction"; The composite anti-stripping agent is a mixture of 2-benzylaminoacetamide and stearic acid diethanolamide, and the mass ratio of the two is 5-12:3; The inorganic pigment is one of iron oxide red, iron oxide yellow, cobalt blue and manganese violet; The following are further improvements to the above technical solution: Step 1: Preparation of modified calcium carbonate whiskers The calcium carbonate whisker is placed in an oven at 80-110° C. and dried for 6-12 hours, and then added to a reaction kettle, and then toluene and polyoxyethylene sorbitan fatty acid ester are added, and the stirring rate is controlled at 3500-5000 rpm, and the mixture is vigorously stirred and dispersed for 7-12 hours, and then the stirring rate is reduced to 1000-1600 rpm, and then the temperature is raised and kept constant at 70-120° C., and acyl chloride is added while maintaining the condensation reflux state, and then triethylamine is added dropwise to the kettle at a rate of 1-20 g / min, and after the triethylamine is added dropwise, the mixture is kept in the condensation reflux state, and the mixture is stirred and reacted at a constant temperature for 3-6 hours, and then oleylamine is added, and then the mixture is stirred and reacted at a constant temperature for 4-7 hours, and then the mixture is cooled to room temperature, and centrifuged, and the separated solid is washed with anhydrous ethanol for 2-4 times and then with deionized water for 1-3 times, and then placed in an oven at 70-95° C. and dried for 5-10 hours to obtain modified calcium carbonate whiskers; The length of the calcium carbonate whisker is 20-80 μm and the diameter is 0.5-2 μm; The acyl chloride is one of adipoyl chloride and terephthaloyl chloride; The mass ratio of the calcium carbonate whisker, toluene, polyoxyethylene sorbitan fatty acid ester, acyl chloride, triethylamine and oleylamine is 45-110:160-300:1-4:10-35:1-5:15-45.

[0009] Step 2: Preparation of modified rubber powder After drying the rubber powder at 50-70°C for 4-8 hours, the rubber powder is placed in a high-speed shear emulsifier, pine tar and castor oil are added, the high-speed dispersing paddle is turned on, the dispersing rate is controlled at 5000-9000 rpm, the material in the kettle is heated and kept at a constant temperature of 130-160°C, and after high-speed dispersing and shearing at a constant temperature for 1-4 hours, an organic acid is added, and then calcium peroxide powder is added at a rate of 10-50 g / min. After the addition is completed, the constant temperature stirring is continued for 2-4 hours, the dispersing rate is reduced to 3000-4500 rpm, and then the epoxy compound and triethanolamine are added. After the reaction is continued at a constant temperature stirring for 1.5-3 hours, the temperature is cooled to room temperature, and the modified rubber powder is obtained by discharging the material; The rubber powder is waste tire rubber powder with a particle size of 100-600 meshes; The organic acid is one of benzoic acid and abietic acid; The particle size of the calcium peroxide powder is 400-800 mesh; The epoxy compound is one of methyl 2,3-epoxypropionate and epoxypropionic acid; The mass ratio of the rubber powder, pine tar, castor oil, organic acid, calcium peroxide powder, epoxy compound and triethanolamine is 100-170:35-95:25-65:5-12:5-20:10-40:2-7.

[0010] Step 3: Preparation of Color Modified Asphalt According to the specific formula of color modified asphalt in parts by weight, first put road petroleum asphalt, modified calcium carbonate whisker and modified rubber powder into a mixing kettle with a high-speed stirring paddle and a high-speed dispersing paddle, turn on the high-speed stirring paddle, control the stirring rate at 1000-2000 rpm, heat the materials in the kettle and keep the temperature at 140-180°C, then turn on the high-speed dispersing paddle, control the dispersing rate at 6000-10000 rpm, and after dispersing for 80-130 minutes, add the composite anti-stripping agent and inorganic pigment, continue to disperse for 100-160 minutes, turn off the high-speed dispersing paddle and only keep the high-speed stirring paddle, control the stirring rate at 1000-2000 rpm, cool to 95-105°C and then discharge, and cool to room temperature after discharging to obtain color modified asphalt.

[0011] Step 4: Preparation of permeable colored asphalt concrete The aggregates are graded and mixed in advance, and then the colored modified asphalt is added to the mixing kettle. The stirring rate is controlled at 800-1300 rpm and heated. The asphalt in the kettle is heated and kept at a constant temperature of 150-180°C. Then, according to the mass ratio of colored modified asphalt to aggregate of 1-2:10, the aggregates are added to the mixing kettle. After stirring and mixing for 1.5-4 hours, the permeable colored asphalt concrete directly used for road paving is obtained.

[0012] Compared with the prior art, the present invention achieves the following beneficial effects: 1. The present invention uses calcium carbonate whiskers to enhance the mechanical properties of an asphalt matrix. In order to ensure the uniformity of the dispersion of the calcium carbonate whiskers in the asphalt matrix, the calcium carbonate whiskers are firstly uniformly dispersed in toluene under the dispersing effect of polyoxyethylene sorbitan fatty acid ester, and then adipoyl chloride or terephthaloyl chloride is added, followed by the addition of a catalyst triethylamine. Under the catalytic effect of triethylamine, the acyl chloride group at one end of the diacyl chloride reacts with the hydroxyl group on the surface of the calcium carbonate whisker. After the reaction is completed, the surface of the calcium carbonate whisker is covered with acyl chloride functional groups, and then oleylamine is added. After the primary amine group at the end of the oleylamine reacts with the acyl chloride functional group, the surface of the calcium carbonate whisker is covered with a long-chain alkane group, thereby making the hydrophilic calcium carbonate whiskers hydrophobic, improving the compatibility of the calcium carbonate whiskers with the asphalt matrix, and then ensuring that the calcium carbonate whiskers can be well dispersed in the asphalt matrix, playing a role in strengthening and toughening the permeable colored asphalt concrete; 2. The present invention uses rubber powder to improve the low-temperature brittleness, toughness under high load and adsorption of aggregates of the asphalt matrix. The microscopic molecular structure of the rubber powder is a three-dimensional network rubber polymer formed by vulcanization and cross-linking. Carbon black is generally used as a reinforcing filler. The non-polarity of the rubber powder is very strong and its compatibility with the weakly polar asphalt matrix is ​​poor. In addition, carbon black is an inorganic filler, and the carbon black dissociated from the rubber powder is also difficult to obtain good compatibility with the asphalt matrix. Based on the above reasons, the present invention first uses pine tar and castor oil to heat swell the rubber powder, and at the same time combines high-speed shear The process is to reduce the size of the rubber powder particles by shearing, and to make the rubber powder initially swell and penetrate the internal cross-linking network, so that the internal cross-linking network of the rubber powder particles is fully swollen, so that the subsequent reaction materials can enter the vulcanized cross-linking network inside the rubber powder particles, and then organic acid and calcium peroxide are added. Under the catalysis of organic acid, calcium peroxide decomposes at high temperature to generate oxygen, and the vulcanized cross-linking network inside the rubber powder particles is oxidized by the high-temperature oxygen, and the cross-linking network is oxidized and broken. Then the epoxy compound added is catalyzed by triethanolamine. , the epoxy compound ring-opening reacts with the cross-linked network end after the rubber powder is dissociated, which increases the polarity of the molecular chain end after the cross-linked network is dissociated, and promotes the compatibility of the rubber powder after dissociation with the asphalt matrix. In addition, the strong oxidizing environment of the oxygen structure generated by the high-temperature decomposition of calcium peroxide will also have a certain oxidizing effect on the inorganic carbon black, so that some oxygen-containing polar functional groups (such as hydroxyl and carboxyl groups, etc.) are generated on the surface of the carbon black, which also makes the carbon black dissociated from the rubber powder have good compatibility with the asphalt matrix. In addition, the pine tar and castor oil used in the present invention have very good high-temperature stability. Under the heating conditions of rubber powder modification and asphalt mixing, they can maintain sufficiently good thermal stability without decomposition. Pine tar itself is often used as a rubber softener and can swell rubber polymers very well. Moreover, the main components of pine tar are aromatic phenols, which have a very similar molecular structure to the polycyclic aromatic hydrocarbons in asphalt, and the two are very compatible. In addition, castor oil has a large polarity and can play a polar transition role between rubber powder particles and asphalt, promoting the compatibility of modified rubber powder with the asphalt matrix; 3. The composite anti-stripping agent composed of 2-benzylaminoacetamide and stearic acid diethanolamide added in the present invention plays a role in enhancing the adhesion between the asphalt matrix and the aggregate. The above two amide substances have very good compatibility with the asphalt matrix itself, and their molecular structures have certain alkalinity due to the presence of amine groups or lone pairs of electrons on nitrogen atoms, and have a relatively strong chemical adsorption effect with the acidic groups on the surface of the aggregate. The ends of the asphalt matrix molecules are mainly acidic groups, and the above two amide substances and the asphalt matrix can also have a relatively strong chemical adsorption effect. Therefore, 2-benzylaminoacetamide and stearic acid diethanolamide have a bridging effect, thereby promoting the adhesion effect between the aggregate and the asphalt matrix, and further improving the water stability of the permeable colored asphalt concrete and other related road performance; 4. The permeable colored asphalt concrete prepared by the present invention has a Marshall stability of 8.39-8.91 kN, a compressive strength of 57.9-64.5 MPa, a water stability RMS of 97.5-98.4%, a TSR of 95.2-97.0%, a porosity of 18.4-21.6%, and a water permeability coefficient of 61-70 mm / s. DETAILED DESCRIPTION

[0013] The preferred embodiments of the present invention are described below. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0014] Example 1: A method for preparing permeable colored asphalt concrete Step 1: Preparation of modified calcium carbonate whiskers After the calcium carbonate whisker is placed in a 100° C. oven and dried for 10 hours, it is added to a reaction kettle, and then toluene and polyoxyethylene sorbitan fatty acid ester are added, and the stirring rate is controlled at 4500 rpm, and the mixture is vigorously stirred and dispersed for 11 hours, and then the stirring rate is reduced to 1500 rpm, and then the temperature is raised and kept constant at 100° C., and acyl chloride is added under a condensation reflux state, and then triethylamine is added dropwise to the kettle at a rate of 10 g / min, and after the triethylamine is added dropwise, the mixture is kept under a condensation reflux state, and the mixture is stirred and reacted at a constant temperature for 4 hours, and then oleylamine is added, and then the mixture is stirred and reacted at a constant temperature for 6 hours, and then the mixture is cooled to room temperature and centrifuged, and the separated solid is washed with anhydrous ethanol 3 times and then washed with deionized water 2 times, and then placed in an 80° C. oven and dried for 8 hours to obtain modified calcium carbonate whiskers; The calcium carbonate whisker has a length of 40 μm and a diameter of 1 μm; The acyl chloride is adipoyl chloride; The mass ratio of the calcium carbonate whisker, toluene, polyoxyethylene sorbitan fatty acid ester, acyl chloride, triethylamine and oleylamine is 80:220:3:25:2:30.

[0015] Step 2: Preparation of modified rubber powder After drying the rubber powder at 60° C. for 7 hours, the rubber powder is placed in a high-speed shear emulsifier, and then pine tar and castor oil are added. The high-speed dispersing paddle is turned on, and the dispersing rate is controlled at 8000 rpm. The material in the kettle is heated and kept at a constant temperature of 150° C. After constant temperature high-speed dispersing and shearing for 2 hours, an organic acid is added, and then calcium peroxide powder is added at a rate of 20 g / min. After the addition is completed, the constant temperature stirring is continued for 3 hours, and the dispersing rate is reduced to 4000 rpm, and then the epoxy compound and triethanolamine are added. The reaction is continued for 2 hours of constant temperature stirring, and then the temperature is cooled to room temperature, and the material is discharged to obtain the modified rubber powder; The rubber powder is waste tire rubber powder with a particle size of 400 meshes; The organic acid is benzoic acid; The particle size of the calcium peroxide powder is 600 mesh; The epoxy compound is methyl 2,3-epoxypropionate; The mass ratio of the rubber powder, pine tar, castor oil, organic acid, calcium peroxide powder, epoxy compound and triethanolamine is 150:80:50:8:15:30:5.

[0016] Step 3: Preparation of Color Modified Asphalt The specific formula of the colored modified asphalt is, in parts by weight: 250 parts of road petroleum asphalt, 35 parts of modified calcium carbonate whisker, 40 parts of modified rubber powder, 8 parts of composite anti-stripping agent, 35 parts of inorganic pigment; The road petroleum asphalt is No. 70 asphalt specified in JTGF40-2019 "Technical Specifications for Highway Asphalt Pavement Construction"; The composite anti-stripping agent is a mixture of 2-benzylaminoacetamide and stearic acid diethanolamide, and the mass ratio of the two is 9:3; The inorganic pigment is red iron oxide; According to the specific formula of color modified asphalt in parts by weight, first put road petroleum asphalt, modified calcium carbonate whisker, and modified rubber powder into a mixing kettle with a high-speed stirring paddle and a high-speed dispersing paddle, turn on the high-speed stirring paddle, control the stirring rate at 1600 rpm, heat the materials in the kettle and keep the temperature at 150°C, then turn on the high-speed dispersing paddle, control the dispersing rate at 8500 rpm, and after dispersing for 100 minutes, add the composite anti-stripping agent and inorganic pigment, continue to disperse for 150 minutes, turn off the high-speed dispersing paddle and only keep the high-speed stirring paddle, control the stirring rate at 1600 rpm, cool to 100°C and then discharge, and cool to room temperature after discharging to obtain color modified asphalt.

[0017] Step 4: Preparation of permeable colored asphalt concrete Aggregates are graded and mixed well in advance, and then the color modified asphalt is added to the mixing kettle, and the stirring rate is controlled at 1000 rpm, and the asphalt in the kettle is heated and kept at a constant temperature of 170°C. Then, according to the mass ratio of color modified asphalt to aggregate of 1.6:10, the aggregate is added to the mixing kettle, and after stirring and mixing for 3 hours, the permeable color asphalt concrete directly used for road paving is obtained; The aggregate is a stone material that meets the grading standard in "Technical Specification for Highway Asphalt Pavement Construction JTG F40-2004", and the grading method is: the percentage passing through the 26.5mm sieve hole is 100wt%, the percentage passing through the 19.0mm sieve hole is 96wt%, the percentage passing through the 13.2mm sieve hole is 80wt%, the percentage passing through the 9.5mm sieve hole is 55wt%, the percentage passing through the 4.75mm sieve hole is 18wt%, the percentage passing through the 2.36mm sieve hole is 11wt%, the percentage passing through the 1.18mm sieve hole is 9wt%, the percentage passing through the 0.6mm sieve hole is 6wt%, the percentage passing through the 0.3mm sieve hole is 4wt%, the percentage passing through the 0.15mm sieve hole is 3wt%, and the percentage passing through the 0.075mm sieve hole is 2.6wt%.

[0018] Example 2: A method for preparing permeable colored asphalt concrete Step 1: Preparation of modified calcium carbonate whiskers The calcium carbonate whisker is placed in an oven at 80° C. and dried for 6 hours, and then added to a reaction kettle, and then toluene and polyoxyethylene sorbitan fatty acid ester are added, and the stirring rate is controlled at 3500 rpm, and the mixture is vigorously stirred and dispersed for 7 hours, and then the stirring rate is reduced to 1000 rpm, and then the temperature is raised and kept constant at 70° C., and acyl chloride is added under a condensation reflux state, and then triethylamine is added dropwise to the kettle at a rate of 1 g / min, and after the triethylamine is added dropwise, the mixture is kept under a condensation reflux state, and the mixture is stirred and reacted at a constant temperature for 3 hours, and then oleylamine is added, and then the mixture is stirred and reacted at a constant temperature for 4 hours, and then the mixture is cooled to room temperature, and centrifuged, and the separated solid is washed with anhydrous ethanol twice and then with deionized water once, and then placed in an oven at 70° C. and dried for 5 hours to obtain modified calcium carbonate whiskers; The length of the calcium carbonate whisker is 20 μm and the diameter is 0.5 μm; The acyl chloride is terephthaloyl chloride; The mass ratio of the calcium carbonate whisker, toluene, polyoxyethylene sorbitan fatty acid ester, acyl chloride, triethylamine and oleylamine is 45:160:1:10:1:15.

[0019] Step 2: Preparation of modified rubber powder After drying the rubber powder at 50° C. for 4 hours, the rubber powder is placed in a high-speed shear emulsifier, and then pine tar and castor oil are added. The high-speed dispersing paddle is turned on, and the dispersing rate is controlled at 5000 rpm. The material in the kettle is heated and kept at a constant temperature of 130° C. After constant temperature high-speed dispersing and shearing for 1 hour, an organic acid is added, and then calcium peroxide powder is added at a rate of 10 g / min. After the addition is completed, the constant temperature stirring is continued for 2 hours, and the dispersing rate is reduced to 3000 rpm, and then the epoxy compound and triethanolamine are added. The reaction is continued for 1.5 hours of constant temperature stirring, and then the temperature is cooled to room temperature, and the material is discharged to obtain the modified rubber powder; The rubber powder is waste tire rubber powder with a particle size of 100 meshes; The organic acid is rosin acid; The particle size of the calcium peroxide powder is 400 mesh; The epoxy compound is epoxy propionic acid; The mass ratio of the rubber powder, pine tar oil, castor oil, organic acid, calcium peroxide powder, epoxy compound and triethanolamine is 100:35:25:5:5:10:2.

[0020] Step 3: Preparation of Color Modified Asphalt The specific formula of the colored modified asphalt is, in parts by weight: 220 parts of road petroleum asphalt, 15 parts of modified calcium carbonate whisker, 25 parts of modified rubber powder, 5 parts of composite anti-stripping agent, 25 parts of inorganic pigment; The road petroleum asphalt is No. 90 asphalt specified in JTGF40-2019 "Technical Specifications for Highway Asphalt Pavement Construction"; The composite anti-stripping agent is a mixture of 2-benzylaminoacetamide and stearic acid diethanolamide, and the mass ratio of the two is 5:3; The inorganic pigment is yellow iron oxide; According to the specific formula of color modified asphalt in parts by weight, first put road petroleum asphalt, modified calcium carbonate whisker, and modified rubber powder into a mixing kettle with a high-speed stirring paddle and a high-speed dispersing paddle, turn on the high-speed stirring paddle, control the stirring rate at 1000 rpm, heat the materials in the kettle and keep the temperature at 140°C, then turn on the high-speed dispersing paddle, control the dispersing rate at 6000 rpm, and after dispersing for 80 minutes, add the composite anti-stripping agent and inorganic pigment, continue to disperse for 100 minutes, turn off the high-speed dispersing paddle and only keep the high-speed stirring paddle, control the stirring rate at 1000 rpm, cool to 95°C and then discharge, and cool to room temperature after discharging to obtain color modified asphalt.

[0021] Step 4: Preparation of permeable colored asphalt concrete Aggregates are graded and mixed well in advance, and then the colored modified asphalt is added to the mixing kettle. The stirring rate is controlled at 800 rpm, and the asphalt in the kettle is heated and kept constant at 150°C. Then, the aggregates are added to the mixing kettle at a mass ratio of 1:10 of the colored modified asphalt to the aggregates. After stirring and mixing for 1.5 hours, the permeable colored asphalt concrete directly used for road paving is obtained. The aggregate is a stone material conforming to the grading standard in "Technical Specification for Highway Asphalt Pavement Construction JTG F40-2004", and the grading method is: the percentage passing through the 26.5mm sieve hole is 100wt%, the percentage passing through the 19.0mm sieve hole is 93wt%, the percentage passing through the 13.2mm sieve hole is 55wt%, the percentage passing through the 9.5mm sieve hole is 30wt%, the percentage passing through the 4.75mm sieve hole is 15wt%, the percentage passing through the 2.36mm sieve hole is 10wt%, the percentage passing through the 1.18mm sieve hole is 7wt%, the percentage passing through the 0.6mm sieve hole is 3wt%, the percentage passing through the 0.3mm sieve hole is 3wt%, the percentage passing through the 0.15mm sieve hole is 2wt%, and the percentage passing through the 0.075mm sieve hole is 2wt%.

[0022] Example 3: A method for preparing permeable colored asphalt concrete Step 1: Preparation of modified calcium carbonate whiskers The calcium carbonate whisker is placed in a 110° C. oven and dried for 12 hours, and then added to a reaction kettle, and then toluene and polyoxyethylene sorbitan fatty acid ester are added, and the stirring rate is controlled to be 5000 rpm, and the stirring rate is reduced to 1600 rpm, and then the temperature is raised and kept constant at 120° C., and acyl chloride is added under a condensation reflux state, and then triethylamine is added dropwise to the kettle at a rate of 20 g / min, and after the triethylamine is added, the condensation reflux state is maintained, and the reaction is stirred at a constant temperature for 6 hours, and then oleylamine is added, and then the reaction is stirred at a constant temperature for 7 hours, and then the reaction is cooled to room temperature, and centrifuged, and the separated solid is washed with anhydrous ethanol 4 times and then washed with deionized water 3 times, and then placed in a 95° C. oven and dried for 10 hours to obtain modified calcium carbonate whiskers; The length of the calcium carbonate whisker is 80 μm and the diameter is 2 μm; The acyl chloride is adipoyl chloride; The mass ratio of the calcium carbonate whisker, toluene, polyoxyethylene sorbitan fatty acid ester, acyl chloride, triethylamine and oleylamine is 110:300:4:35:5:45.

[0023] Step 2: Preparation of modified rubber powder After drying the rubber powder at 70° C. for 8 hours, the rubber powder is placed in a high-speed shear emulsifier, and then pine tar and castor oil are added. The high-speed dispersing paddle is turned on, and the dispersing rate is controlled at 9000 rpm. The material in the kettle is heated and kept at a constant temperature of 160° C. After constant temperature high-speed dispersing and shearing for 4 hours, an organic acid is added, and then calcium peroxide powder is added at a rate of 50 g / min. After the addition is completed, the constant temperature stirring is continued for 4 hours, and the dispersing rate is reduced to 4500 rpm, and then the epoxy compound and triethanolamine are added. The reaction is continued for 3 hours of constant temperature stirring, and then the temperature is cooled to room temperature, and the material is discharged to obtain the modified rubber powder; The rubber powder is waste tire rubber powder with a particle size of 600 mesh; The organic acid is benzoic acid; The particle size of the calcium peroxide powder is 800 mesh; The epoxy compound is methyl 2,3-epoxypropionate; The mass ratio of the rubber powder, pine tar, castor oil, organic acid, calcium peroxide powder, epoxy compound and triethanolamine is 170:95:65:12:20:40:7.

[0024] Step 3: Preparation of Color Modified Asphalt The specific formula of the colored modified asphalt is, in parts by weight: 300 copies of road petroleum asphalt, 45 parts of modified calcium carbonate whisker, 60 parts of modified rubber powder, 10 parts of composite anti-stripping agent, 40 parts of inorganic pigment; The road petroleum asphalt is No. 70 asphalt specified in JTGF40-2019 "Technical Specifications for Highway Asphalt Pavement Construction"; The composite anti-stripping agent is a mixture of 2-benzylaminoacetamide and stearic acid diethanolamide, and the mass ratio of the two is 12:3; The inorganic pigment is cobalt blue; According to the specific formula of color modified asphalt in parts by weight, first put road petroleum asphalt, modified calcium carbonate whisker, and modified rubber powder into a mixing kettle with a high-speed stirring paddle and a high-speed dispersing paddle, turn on the high-speed stirring paddle, control the stirring rate at 2000 rpm, heat the materials in the kettle and keep the temperature at 180°C, then turn on the high-speed dispersing paddle, control the dispersing rate at 10000 rpm, and after dispersing for 130 minutes, add the composite anti-stripping agent and inorganic pigment, continue to disperse for 160 minutes, turn off the high-speed dispersing paddle and only keep the high-speed stirring paddle, control the stirring rate at 2000 rpm, cool to 105°C and then discharge, and cool to room temperature after discharging to obtain color modified asphalt.

[0025] Step 4: Preparation of permeable colored asphalt concrete Aggregates are graded and mixed in advance, and then the color modified asphalt is added to the mixing kettle, and the stirring rate is controlled at 1300 rpm, and the asphalt in the kettle is heated and kept at 180°C. Then, according to the mass ratio of color modified asphalt to aggregate of 2:10, the aggregate is added to the mixing kettle, and after stirring and mixing for 4 hours, the permeable color asphalt concrete directly used for road paving is obtained; The aggregate is a stone material that meets the grading standard in "Technical Specification for Highway Asphalt Pavement Construction JTG F40-2004", and the grading method is: the percentage passing through the 26.5mm sieve hole is 100wt%, the percentage passing through the 19.0mm sieve hole is 97wt%, the percentage passing through the 13.2mm sieve hole is 95wt%, the percentage passing through the 9.5mm sieve hole is 70wt%, the percentage passing through the 4.75mm sieve hole is 19wt%, the percentage passing through the 2.36mm sieve hole is 14wt%, the percentage passing through the 1.18mm sieve hole is 10wt%, the percentage passing through the 0.6mm sieve hole is 7wt%, the percentage passing through the 0.3mm sieve hole is 5wt%, the percentage passing through the 0.15mm sieve hole is 4wt%, and the percentage passing through the 0.075mm sieve hole is 3wt%.

[0026] Example 4: A method for preparing permeable colored asphalt concrete The operations of steps 1 and 2 are the same as those of Example 1; Step 3: Preparation of Color Modified Asphalt The inorganic pigment is manganese violet, and the other operations are the same as in Example 1; The operation of step 4 is the same as that of embodiment 1.

[0027] Comparative Example 1: Based on Example 1, step 1, preparation of modified calcium carbonate whiskers, is not performed. In step 3, preparation of colored modified asphalt, modified calcium carbonate whiskers are not added, and 35 parts of modified calcium carbonate whiskers are replaced by 35 parts of road petroleum asphalt in equal amounts. The specific operations are as follows: The step 1, preparation of modified calcium carbonate whiskers is not performed; The operation of step 2 is the same as that of embodiment 1; Step 3: Preparation of Color Modified Asphalt 35 parts of modified calcium carbonate whiskers were replaced by 35 parts of road petroleum asphalt, and the other operations were the same as in Example 1; The operation of step 4 is the same as that of embodiment 1.

[0028] Comparative Example 2: Based on Example 1, step 1, preparation of modified calcium carbonate whiskers, is not performed. In step 3, preparation of colored modified asphalt, modified calcium carbonate whiskers are not added, and unmodified calcium carbonate whiskers are directly added. 35 parts of modified calcium carbonate whiskers are replaced by 35 parts of calcium carbonate whiskers in equal amounts. The specific operation is as follows: Step 1, preparation of modified reinforcing fiber is not performed; The operation of step 2 is the same as that of embodiment 1; Step 3: Preparation of Color Modified Asphalt 35 parts of modified calcium carbonate whiskers were replaced by 35 parts of calcium carbonate whiskers, and the other operations were the same as in Example 1; The calcium carbonate whisker has a length of 40 μm and a diameter of 1 μm; The operation of step 4 is the same as that of embodiment 1.

[0029] Comparative Example 3: Based on Example 1, step 2, preparation of modified rubber powder, is not performed. In step 3, preparation of colored modified asphalt, 40 parts of modified rubber powder are replaced with 40 parts of rubber powder. The specific operation is as follows: The operation of step 1 is the same as that of embodiment 1; Step 2, preparation of modified rubber powder is not performed; Step 3: Preparation of Color Modified Asphalt 40 parts of modified rubber powder were replaced by 40 parts of rubber powder, and other operations were the same as in Example 1; The rubber powder is waste tire rubber powder with a particle size of 400 meshes; The operation of step 4 is the same as that of embodiment 1.

[0030] Comparative Example 4: Based on Example 1, in step 2, in the preparation of the modified rubber powder, no organic acid and calcium peroxide powder are added, and 8 parts of organic acid and 15 parts of calcium peroxide powder are replaced by 23 parts of rubber powder in equal amounts. The specific operation is as follows: The operation of step 1 is the same as that of embodiment 1; Step 2: Preparation of modified rubber powder After drying the rubber powder at 60°C for 7 hours, the rubber powder is placed in a high-speed shear emulsifier, and then pine tar and castor oil are added. The high-speed dispersing paddle is turned on, and the dispersing rate is controlled at 8000 rpm. The material in the kettle is heated and kept at a constant temperature of 150°C. After high-speed dispersing and shearing at a constant temperature for 5 hours, the dispersing rate is reduced to 4000 rpm, and then the epoxy compound and triethanolamine are added. The reaction is continued at a constant temperature and stirred for 2 hours, and then the temperature is cooled to room temperature, and the material is discharged to obtain the modified rubber powder. The rubber powder is waste tire rubber powder with a particle size of 400 meshes; The epoxy compound is methyl 2,3-epoxypropionate; The mass ratio of the rubber powder, pine tar, castor oil, epoxy compound and triethanolamine is 173:80:50:30:5; The operations of steps 3 and 4 are the same as those of Example 1.

[0031] Comparative Example 5: Based on Example 1, in step 2, in the preparation of the modified rubber powder, no epoxy compound and triethanolamine were added, and 30 parts of epoxy compound and 5 parts of triethanolamine were replaced by 35 parts of rubber powder in equal amounts. The specific operation was as follows: The operation of step 1 is the same as that of embodiment 1; Step 2: Preparation of modified rubber powder After drying the rubber powder at 60° C. for 7 hours, the rubber powder is placed in a high-speed shear emulsifier, and then pine tar and castor oil are added. The high-speed dispersing paddle is turned on, and the dispersing rate is controlled at 8000 rpm. The material in the kettle is heated and kept at a constant temperature of 150° C. After constant temperature high-speed dispersing and shearing for 2 hours, an organic acid is added, and then calcium peroxide powder is added at a rate of 20 g / min. After the addition is completed, the constant temperature stirring is continued for 3 hours, and the dispersing rate is reduced to 4000 rpm. After the reaction is continued for 2 hours, the temperature is cooled to room temperature, and the material is discharged to obtain the modified rubber powder; The rubber powder is waste tire rubber powder with a particle size of 400 meshes; The organic acid is benzoic acid; The particle size of the calcium peroxide powder is 600 mesh; The mass ratio of the rubber powder, pine tar, castor oil, organic acid and calcium peroxide powder is 185:80:50:8:15; The operations of steps 3 and 4 are the same as those of Example 1.

[0032] Comparative Example 6: Based on Example 1, in step 3, in the preparation of colored modified asphalt, 8 parts of the composite anti-stripping agent were replaced by 8 parts of road petroleum asphalt in equal amounts, and the specific operation was as follows: The operations of steps 1 and 2 are the same as those of Example 1; Step 3: Preparation of Color Modified Asphalt 8 parts of the composite anti-stripping agent were replaced by 8 parts of road petroleum asphalt, and the other operations were the same as in Example 1; The operation of step 4 is the same as that of embodiment 1.

[0033] Performance Test: According to the test method in JTG-E20-2011 "Test Procedure for Asphalt and Asphalt Mixtures in Highway Engineering", the permeable colored asphalt concrete obtained in Examples 1, 2, 3, 4 and Comparative Examples 1, 2, 3, 4, 5, 6 was tested for Marshall stability, compressive strength, water stability, porosity, water permeability and other indicators, wherein the water stability was evaluated by the soaked Marshall residual stability (RMS) and the freeze-thaw splitting residual strength ratio (TSR), and the results are shown in Table 1:

[0034]

[0035] It can be seen from the data in Table 1 that the Marshall stability of Examples 1-4 is all above 8kN, which is greater than the Marshall stability requirement for permeable asphalt concrete for urban light traffic roads. The compressive strength is also relatively high, all above 57.9MPa, the RMS and TSR of water stability are both above 95%, the porosity range is 18.4~21.6%, and the corresponding water permeability coefficient is 61~70mm / s, which shows that the permeable colored asphalt concrete obtained in Examples 1-4 has very good road performance, durability and good water permeability; in Comparative Example 1, no modified calcium carbonate whisker is added, and the Marshall stability and compressive strength are reduced to the lowest value among all the embodiments and comparative examples, the water stability is also sharply reduced, the porosity is increased compared with Example 1, and the water permeability coefficient is also significantly reduced, which shows that the modified calcium carbonate whisker plays a vital role in improving the mechanical properties of the permeable colored asphalt concrete and maintaining its long-term road performance; in Comparative Example 2, the modified calcium carbonate whisker is added. The whiskers are replaced by calcium carbonate whiskers. The Marshall stability, compressive strength and water stability of Example 2 are slightly better than those of Example 1. It can be seen that if the calcium carbonate whiskers are not modified, they can hardly play a role in strengthening and toughening the permeable colored asphalt concrete. This may be because the unmodified calcium carbonate whiskers are difficult to be well dispersed in the asphalt matrix, and thus it is difficult to play a mechanical strengthening role. In addition, the porosity and water permeability coefficient of Example 2 are higher than those of Example 1. This may also be due to the agglomeration of calcium carbonate whiskers, which leads to poor adhesion between the asphalt matrix and the aggregate, thereby increasing the porosity and the water permeability coefficient. In Example 3, the modified rubber powder is replaced by rubber powder in equal amounts. The Marshall stability, compressive strength and water stability of Example 3 are greatly reduced. This shows that if the rubber powder is not modified, it is difficult to be compatible with the asphalt matrix, and then it will be difficult to play a role in low-temperature toughening of the asphalt matrix due to the segregation problem. In addition, the porosity of Example 3 increases to 24.4%, and the water permeability coefficient also increased greatly to 73mm / s, which may also be due to the fact that the rubber powder is not modified and there is phase separation with the asphalt matrix; in Example 4, organic acid and calcium peroxide powder are not added in the preparation of the modified rubber powder. The Marshall stability, compressive strength and water stability of Example 4 are significantly reduced, and the porosity and water permeability coefficient do not change significantly. This shows that organic acid and calcium peroxide powder can undergo effective modification chemical reactions in the step of rubber powder modification, and affect the road performance of permeable colored asphalt concrete by promoting the compatibility of rubber powder and asphalt matrix; in Example 5, epoxy compounds and triethanolamine are not added in the preparation of the modified rubber powder. The test results of Example 5 are similar to those of Example 4, but the indicators of Example 5 are reduced. The magnitude of the difference is smaller than that of comparative example 4, which indicates that the role played by epoxy compounds and triethanolamine is similar to that of organic acids and calcium peroxide powder, that is, they can affect the road performance of permeable colored asphalt concrete by promoting the compatibility of rubber powder and asphalt matrix; no composite anti-stripping agent is added to comparative example 6, and the Marshall stability and compressive strength of comparative example 6 are significantly reduced, the water stability is greatly reduced, the porosity is increased, and the water permeability coefficient is increased, which indicates that the composite anti-stripping agent has a significant effect on improving the road performance of permeable colored asphalt concrete, especially the water stability. This may be because the composite anti-stripping agent can enhance the adhesion between aggregate and asphalt matrix, thereby greatly improving the water stability of asphalt concrete. .

[0036] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A permeable colored asphalt concrete, characterized by: The permeable colored asphalt concrete is composed of colored modified asphalt and aggregate, and the mass ratio of the colored modified asphalt to the aggregate is 1-2:10; The aggregate is a stone material that meets the grading standard of "Technical Specification for Highway Asphalt Pavement Construction JTG F40-2004", and the grading method is: the percentage passing through the 26.5mm sieve hole is 100wt%, the percentage passing through the 19.0mm sieve hole is 93-97wt%, the percentage passing through the 13.2mm sieve hole is 55-95wt%, the percentage passing through the 9.5mm sieve hole is 30-70wt%, the percentage passing through the 4.75mm sieve hole is 15-19wt%, the percentage passing through the 2.36mm sieve hole is 10-14wt%, the percentage passing through the 1.18mm sieve hole is 7-10wt%, the percentage passing through the 0.6mm sieve hole is 3-7wt%, the percentage passing through the 0.3mm sieve hole is 3-5wt%, the percentage passing through the 0.15mm sieve hole is 2-4wt%, and the percentage passing through the 0.075mm sieve hole is 2-3wt%; The specific formula of the colored modified asphalt is, in parts by weight: 220~300 parts of road petroleum asphalt, Modified calcium carbonate whisker 15~45 parts, Modified rubber powder 25~60 parts, 5~10 parts of composite anti-stripping agent, Inorganic pigment 25~40 parts; The road petroleum asphalt is No. 70 asphalt or No. 90 asphalt specified in JTGF40-2019 "Technical Specifications for Highway Asphalt Pavement Construction"; The composite anti-stripping agent is a mixture of 2-benzylaminoacetamide and stearic acid diethanolamide, and the mass ratio of the two is 5-12:3; The inorganic pigment is one of iron oxide red, iron oxide yellow, cobalt blue and manganese violet; The modified calcium carbonate whisker is prepared by: placing the calcium carbonate whisker in an oven at 80-110°C and drying it for 6-12 hours, adding it to a reaction kettle, then adding toluene and polyoxyethylene sorbitan fatty acid ester, controlling the stirring rate at 3500-5000 rpm, vigorously stirring and dispersing for 7-12 hours, reducing the stirring rate to 1000-1600 rpm, then raising the temperature and keeping the temperature constant at 70-120°C, adding acyl chloride while maintaining the condensation reflux state, then dripping triethylamine into the kettle at a rate of 1-20 g / min, continuing to maintain the condensation reflux state after dripping the triethylamine, stirring and reacting at a constant temperature for 3-6 hours, then adding oleylamine, then continuing to stir and react at a constant temperature for 4-7 hours, cooling to room temperature, centrifuging, washing the separated solid with anhydrous ethanol for 2-4 times and then with deionized water for 1-3 times, then placing it in an oven at 70-95°C and drying it for 5-10 hours, thereby obtaining the modified calcium carbonate whisker; The length of the calcium carbonate whisker is 20-80 μm and the diameter is 0.5-2 μm; The acyl chloride is one of adipoyl chloride and terephthaloyl chloride; The modified rubber powder is prepared by: drying the rubber powder at 50-70°C for 4-8 hours, placing it in a high-speed shear emulsifier, adding pine tar and castor oil, turning on a high-speed dispersing paddle, controlling the dispersing rate at 5000-9000 rpm, raising the temperature of the material in the kettle and keeping the temperature constant at 130-160°C, dispersing and shearing at a constant temperature for 1-4 hours, adding an organic acid, and then adding calcium peroxide powder at a rate of 10-50 g / min. After the addition is completed, stirring at a constant temperature for 2-4 hours, reducing the dispersing rate to 3000-4500 rpm, and then adding an epoxy compound and triethanolamine, continuing the stirring reaction at a constant temperature for 1.5-3 hours, cooling to room temperature, and discharging the material to obtain the modified rubber powder; The rubber powder is waste tire rubber powder with a particle size of 100-600 meshes; The organic acid is one of benzoic acid and abietic acid; The particle size of the calcium peroxide powder is 400-800 mesh; The epoxy compound is one of methyl 2,3-epoxypropionate and epoxypropionic acid; The preparation method of the colored modified asphalt is as follows: according to the specific formula of the colored modified asphalt in parts by weight, road petroleum asphalt, modified calcium carbonate whisker, and modified rubber powder are first put into a mixing kettle with a high-speed stirring paddle and a high-speed dispersing paddle, the high-speed stirring paddle is turned on, the stirring rate is controlled at 1000-2000 rpm, the materials in the kettle are heated and kept at a constant temperature of 140-180°C, and then the high-speed dispersing paddle is turned on, the dispersing rate is controlled at 6000-10000 rpm, and after the dispersion treatment for 80-130 minutes, a composite anti-stripping agent and an inorganic pigment are added, and the dispersion treatment is continued for 100-160 minutes, the high-speed dispersing paddle is turned off and only the high-speed stirring paddle is retained, the stirring rate is controlled at 1000-2000 rpm, the material is discharged after cooling to 95-105°C, and the material is cooled to room temperature after being discharged to obtain the colored modified asphalt.

2. The permeable colored asphalt concrete according to claim 1, characterized in that: The mass ratio of the calcium carbonate whisker, toluene, polyoxyethylene sorbitan fatty acid ester, acyl chloride, triethylamine and oleylamine is 45-110:160-300:1-4:10-35:1-5:15-45.

3. The permeable colored asphalt concrete according to claim 1 is characterized in that: The mass ratio of the rubber powder, pine tar, castor oil, organic acid, calcium peroxide powder, epoxy compound and triethanolamine is 100-170:35-95:25-65:5-12:5-20:10-40:2-7.

4. The method for preparing permeable colored asphalt concrete according to claim 1, characterized in that: The preparation method of the permeable colored asphalt concrete is as follows: the aggregate is graded and mixed in advance, and then the colored modified asphalt is added into the mixing kettle, and the stirring rate is controlled at 800-1300 rpm, and the asphalt in the kettle is heated and kept at a constant temperature of 150-180° C., and then the aggregate is added into the mixing kettle at a mass ratio of the colored modified asphalt to the aggregate of 1-2:10, and after stirring and mixing for 1.5-4 hours, the permeable colored asphalt concrete directly used for road paving is obtained.

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