A self-cleaning fiber-reinforced porous concrete pavement material with inner hydrophobicity, anti-slip property and wear resistance

Abstract

A self-cleaning fiber-reinforced inner hydrophobic anti-slip wear-resistant porous concrete pavement material belongs to the technical field of concrete. The self-cleaning fiber-reinforced inner hydrophobic anti-slip wear-resistant porous concrete pavement material is composed of Portland cement, modified waste tire rubber powder, modified lignin, modified polyvinyl alcohol fiber, fly ash, coarse aggregate gravel, graded coarse quartz sand, graded fine quartz sand, aluminum powder, quicklime powder, calcium polyacrylate, isopropylnaphthalenesulfonate, calcium lignosulfonate, polyether-modified heptamethyltrisiloxane, and water. The porous concrete pavement material obtained by the present invention has a compressive strength of 41.2 - 43.4 MPa, a flexural strength of 5.1 - 5.8 MPa, a contact angle of 116 - 124°, a water permeability coefficient of 7.7 - 8.2 mm / s, a 28-day wear amount of 0.34 - 0.42 kg / m 2 , the BPN value of the anti-slip performance is 68 - 72, and the maximum number of freeze-thaw cycles is 185 - 191 times.

Description

Technical Field

[0001] The present invention relates to a self-cleaning fiber-reinforced inner-hydrophobic anti-slip wear-resistant porous concrete pavement material, belonging to the technical field of concrete. Background Art

[0002] In traditional road paving, dense impermeable paving materials are widely used. While meeting traffic functions, they bring continuous and difficult-to-eliminate ecological negative impacts, including waterlogging, surface runoff pollution, high road surface temperature (above 70 °C in summer), heat island effect, noise pollution, carbon emissions (about 20%) and air pollution, etc.

[0003] Porous concrete refers to a honeycomb-structured material with uniformly distributed pores formed by using cement as the main binder. Due to its advantages in anti-slip, noise reduction, drainage, anti-glare, etc., it has been gradually promoted and applied in pavement engineering in countries such as the United States, Belgium, and Japan. Since porous concrete has excellent properties such as anti-slip with a randomly convex and concave surface structure, drainage through connected pores, and sound absorption in the internal structure, it shows pavement functionality that is difficult to compare with ordinary concrete pavements. Undoubtedly, it is an ideal material for anti-slip and low-noise pavements. However, porous materials have deficiencies in mechanical properties, internal hydrophobicity, and durability. Due to the special structure of porous concrete, its strength is relatively low, and it is prone to the disease of aggregate peeling after being subjected to impact loads and wheel rolling.

[0004] Chinese Patent CN105330319A discloses a preparation method of high-strength lightweight porous concrete, including the following steps: (1) raw material preparation; (2) lightweight aggregate pretreatment; (3) mortar preparation; (4) mixing the mortar with the pretreated lightweight aggregate; (5) concrete prefabrication and pouring. The porous concrete obtained by this patent has relatively low strength, is difficult to meet the requirements of road use, and has no hydrophobicity, and its drainage performance is very poor.

[0005] Chinese Patent CN112299875A discloses a high-strength lightweight porous concrete and its preparation method. The high-strength lightweight porous concrete is made from raw materials including the following parts by weight: 350 - 400 parts of cement, 700 - 800 parts of sand, 1100 - 1200 parts of gravel, 170 - 230 parts of mineral admixture, 220 - 280 parts of water, 20 - 30 parts of heavy calcium, 25 - 40 parts of straw fiber, 15 - 30 parts of kaolin, 5 - 10 parts of foaming agent, 12 - 18 parts of thickening agent, 4 - 8 parts of expanded perlite, and 3 - 5 parts of water reducing agent; the mineral admixture is made from raw materials including the following parts by weight: 50 - 70 parts of steel slag, 30 - 50 parts of fly ash, and 90 - 110 parts of slag; its preparation method is: fully foam the foaming agent through a foaming machine, and then evenly mix the foam with the cement slurry to prepare the high-strength lightweight porous concrete. The porous concrete obtained by this patent has a certain strength, but its hydrophobic and drainage performance is very poor, and it is difficult to solve the drainage problem in the rainy season of roads in rainy cities.

[0006] As can be seen above, porous concrete still has prominent problems such as poor mechanical properties, poor durability, poor internal hydrophobicity resulting in poor drainage, and poor durability. Developing porous concrete pavement materials with high strength, good hydrophobicity, good drainage performance, and excellent durability has very important practical significance for improving urban road construction and the urban environment. Summary of the Invention

[0007] Aiming at the deficiencies of the above-mentioned existing technologies, the present invention provides a self-cleaning fiber-reinforced internally hydrophobic anti-slip and wear-resistant porous concrete pavement material to achieve the following invention purposes: preparing a porous concrete pavement material with good mechanical properties, good hydrophobicity, good drainage performance, excellent durability, and anti-slip and wear resistance.

[0008] To achieve the above invention purposes, the present invention adopts the following technical solutions:

[0009] A self-cleaning fiber-reinforced internally hydrophobic anti-slip and wear-resistant porous concrete pavement material, the specific formula of the self-cleaning fiber-reinforced internally hydrophobic anti-slip and wear-resistant porous concrete pavement material, in parts by weight, is as follows:

[0010] Portland cement 130 - 160 parts,

[0011] Modified waste tire rubber powder 25 - 39 parts,

[0012] Modified lignin 5 - 10 parts,

[0013] Modified polyvinyl alcohol fiber 4 - 11 parts,

[0014] Fly ash 20 - 40 parts,

[0015] Coarse aggregate gravel 8 - 18 parts,

[0016] 25 - 45 parts of graded coarse quartz sand,

[0017] 30 - 50 parts of graded fine quartz sand,

[0018] 3 - 7 parts of aluminum powder,

[0019] 4 - 8 parts of quicklime powder,

[0020] 2 - 6 parts of calcium polyacrylate,

[0021] 1 - 3 parts of sodium isopropylnaphthalenesulfonate,

[0022] 2 - 6 parts of calcium lignosulfonate,

[0023] 0.5 - 1 part of polyether - modified heptamethyltrisiloxane,

[0024] 150 - 230 parts of water;

[0025] The portland cement is ordinary portland cement with a grade of 52.5R;

[0026] The particle size of the fly ash is 1 - 10 μm;

[0027] The particle size of the coarse aggregate gravel is 7 - 20 mm;

[0028] For the graded coarse quartz sand, its moisture content ≤ 0.30%, maximum particle size ≤ 6.00 mm, mud content and powder content ≤ 0.15%, and it has a four - stage continuous gradation of 1.00 - 1.50 mm, 1.51 - 3.00 mm, 3.01 - 5.00 mm, 5.01 - 5.99 mm;

[0029] For the graded fine quartz sand, its moisture content ≤ 0.20%, maximum particle size ≤ 1.00 mm, mud content and powder content ≤ 0.10%, and it has a four - stage continuous gradation of 0.10 - 0.30 mm, 0.31 - 0.50 mm, 0.51 - 0.85 mm, 0.85 - 0.99 mm;

[0030] The particle size of the aluminum powder is 1 - 5 μm;

[0031] The particle size of the quicklime powder is 5 - 20 μm;

[0032] The following is a further improvement of the above technical solution:

[0033] Step 1, Preparation of modified waste tire rubber powder

[0034] After grinding waste tire rubber powder into powder with a particle size of 1 - 12 μm, it is added to a high-pressure reactor, and then dichloroisocyanuric acid, 4-toluenesulfonyl chloride, ethanol, and acetone are added. The temperature is raised to 75 - 90 °C, and at the same time, nitrogen is pressurized to 0.5 - 1.5 MPa. After reacting at a constant temperature for 4 - 8 hours, the pressure is released and the temperature is lowered to room temperature. The material is discharged and filtered. The filtered solid is dried at 50 - 65 °C for 2 - 4 hours to obtain modified waste tire rubber powder;

[0035] The mass ratio of the waste tire rubber powder, dichloroisocyanuric acid, 4-toluenesulfonyl chloride, ethanol, and acetone is 20 - 40:4 - 9:2 - 7:40 - 70:20 - 35.

[0036] Step 2: Preparation of modified lignin

[0037] After crushing lignin into powder with a particle size of 1 - 5 μm, it is added to a high-speed dispersion and mixing kettle, and then p-xylene and diethanolamide oleate are added. The high-speed dispersion impeller is turned on, and high-speed homogeneous dispersion is carried out at a rotation speed of 16000 - 25000 revolutions per minute for 3 - 6 hours. The homogeneous dispersion is stopped, and stirring is started. At a stirring rate of 1000 - 2000 revolutions per minute, 2,5-dichlorophenyl isocyanate and sodium methyl silicate are added. The temperature is raised to 125 - 150 °C, and after reacting at a constant temperature and refluxing for 3 - 6 hours, the temperature is lowered to room temperature. The material is discharged and filtered. The filtered solid is washed with anhydrous ethanol 3 - 5 times and then dried at 75 - 95 °C for 1 - 4 hours to obtain modified lignin;

[0038] The mass ratio of the lignin, p-xylene, diethanolamide oleate, 2,5-dichlorophenyl isocyanate, and sodium methyl silicate is 30 - 50:140 - 180:5 - 8:6 - 12:10 - 18.

[0039] Step 3: Preparation of modified polyvinyl alcohol fiber

[0040] Polyvinyl alcohol fiber, sodium lignosulfonate, sodium hexametaphosphate, methacryloyloxyethyl trimethyl ammonium chloride, and deionized water are added to a mixing kettle. The stirring rate is controlled at 150 - 340 revolutions per minute, and the temperature in the mixing kettle is kept constant at 40 - 60 °C. After reacting with constant stirring for 6 - 10 hours, it is cooled to room temperature, discharged and filtered. The obtained solid is dried at 60 - 80 °C for 4 - 7 hours to obtain modified polyvinyl alcohol fiber;

[0041] The length of the polyvinyl alcohol fiber is 3 - 6 mm, the diameter is 10 - 40 μm, the breaking strength is 1100 - 1300 MPa, and the elastic modulus is 29 - 33 GPa;

[0042] The mass ratio of the polyvinyl alcohol fiber, sodium lignosulfonate, sodium hexametaphosphate, methacryloyloxyethyl trimethyl ammonium chloride, and deionized water is 40 - 65:9 - 14:5 - 10:4 - 9:150 - 200.

[0043] Step 4, Preparation of porous concrete pavement material

[0044] According to the specific formula of the self-cleaning fiber-reinforced inner-hydrophobic anti-slip wear-resistant porous concrete pavement material by weight, put Portland cement, modified waste tire rubber powder, modified lignin, modified polyvinyl alcohol fiber, fly ash, graded coarse quartz sand, and graded fine quartz sand into a mixing kettle for dry mixing. After dry mixing evenly, obtain a powder material. Then mix calcium polyacrylate, isopropylnaphthalenesulfonic acid sodium, calcium lignosulfonate, polyether-modified heptamethyltrisiloxane, and water and stir well to dissolve to obtain a liquid material. Then add the powder material and the liquid material into a mixer and stir evenly. The obtained slurry is the porous concrete pavement material available for paving.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] 1. In the present invention, two substances, dichloroisocyanuric acid and 4-toluenesulfonyl chloride, are used to modify the surface of waste tire rubber powder, increasing the polarity on the surface of the waste tire rubber powder, making it easier to be evenly dispersed in the concrete matrix, so as to fully enhance the toughness of the concrete, improve the durability and hydrophobicity;

[0047] 2. In the present invention, lignin with extremely strong polarity is evenly dispersed into p-xylene solvent under the dispersion action of diethanolamide oleate, and undergoes a surface modification reaction with 2,5-dichlorophenyl isocyanate and sodium methyl silicate. The hydroxyl groups on the surface of lignin react with isocyanate groups and silicon methoxy groups, reducing the surface polarity of lignin, weakening the agglomeration effect of lignin, making it easier to be evenly mixed with the modified waste tire rubber powder. Moreover, lignin itself is fluffy and porous with a low density, and the surface energy of the modified lignin is relatively low, which promotes the action of the modified lignin near the surface during the concrete solidification process, making the concrete surface have stronger hydrophobicity and roughness, increasing the self-cleaning property, water permeability and anti-slip wear resistance of the porous concrete pavement material;

[0048] 3. In the present invention, three substances, sodium lignosulfonate, sodium hexametaphosphate, and methylacryloyloxyethyltrimethylammonium chloride, are used to modify the surface of polyvinyl alcohol fiber, reducing the surface hydrophilicity of polyvinyl alcohol fiber, and then weakening the strong affinity between polyvinyl alcohol fiber and the concrete matrix, avoiding brittle fracture of polyvinyl alcohol fiber when the concrete breaks, so that polyvinyl alcohol fiber is difficult to maximize the enhancement and toughening of the concrete matrix;

[0049] 4. The self-cleaning fiber-reinforced inner-hydrophobic anti-slip wear-resistant porous concrete pavement material prepared by the present invention has a compressive strength of 41.2 - 43.4 MPa, a flexural strength of 5.1 - 5.8 MPa, a contact angle of 116 - 124°, a water permeability coefficient of 7.7 - 8.2 mm / s, and a 28-day wear amount of 0.34 - 0.42 kg / m 2 , and the BPN value of the anti-slip performance is 68 - 72, and the maximum number of freeze-thaw cycles is 185 - 191 times. Specific Embodiments

[0050] The following are descriptions of the preferred embodiments of the present invention. It should be understood that the preferred embodiments described herein are only for illustrating and explaining the present invention and are not used to limit the present invention.

[0051] Example 1: A self-cleaning fiber-reinforced inner-hydrophobic anti-slip wear-resistant porous concrete pavement material

[0052] Step 1: Preparation of modified waste tire rubber powder

[0053] After grinding waste tire rubber powder into powder with a particle size of 7 μm, it is added to a high-pressure reactor, and then dichloroisocyanuric acid, p-toluenesulfonyl chloride, ethanol, and acetone are added. The temperature is raised to 80 °C, and at the same time, nitrogen is pressurized to 1.2 MPa. After reacting at a constant temperature for 7 hours, the pressure is released and the temperature is lowered to room temperature. The material is discharged and filtered. The filtered solid is dried at 64 °C for 3 hours to obtain modified waste tire rubber powder;

[0054] The mass ratio of the waste tire rubber powder, dichloroisocyanuric acid, p-toluenesulfonyl chloride, ethanol, and acetone is 29:7:5:65:30.

[0055] Step 2: Preparation of modified lignin

[0056] After crushing lignin into powder with a particle size of 2 μm, it is added to a high-speed dispersion and mixing kettle, and then p-xylene and diethanolamide oleate are added. Then the high-speed dispersion impeller is started, and high-speed homogeneous dispersion is carried out at a rotation speed of 23,000 revolutions per minute for 4 hours. The homogeneous dispersion is stopped, and stirring is started. At a stirring rate of 1,600 revolutions per minute, 2,5-dichlorophenyl isocyanate and sodium methyl silicate are added, and the temperature is raised to 140 °C. After reacting at a constant temperature under reflux for 4 hours, the temperature is lowered to room temperature. The material is discharged and filtered. The filtered solid is washed 4 times with anhydrous ethanol and then dried at 80 °C for 2 hours to obtain modified lignin;

[0057] The mass ratio of the lignin, p-xylene, diethanolamide oleate, 2,5-dichlorophenyl isocyanate, and sodium methyl silicate is 45:170:7:10:15.

[0058] Step 3: Preparation of modified polyvinyl alcohol fiber

[0059] Polyvinyl alcohol fiber, sodium lignin sulfonate, sodium hexametaphosphate, methacryloyloxyethyl trimethylammonium chloride, and deionized water were added to a mixing kettle, the stirring rate was controlled at 260 rpm, the temperature in the mixing kettle was kept constant at 55°C, and the mixture was stirred at the constant temperature for 9 hours, then cooled to room temperature, filtered, and the obtained solid was dried at 75°C for 6 hours to obtain modified polyvinyl alcohol fiber;

[0060] The polyvinyl alcohol fiber has a length of 4 mm, a diameter of 35 μm, a breaking strength of 1250 MPa, and an elastic modulus of 31 GPa;

[0061] The mass ratio of the polyvinyl alcohol fiber, sodium lignin sulfonate, sodium hexametaphosphate, methacryloyloxyethyltrimethylammonium chloride and deionized water is 55:11:8:7:180.

[0062] Step 4: Preparation of porous concrete pavement materials

[0063] The specific formula of the self-cleaning fiber-reinforced internally hydrophobic anti-skid and wear-resistant porous concrete pavement material is as follows, in parts by weight:

[0064] 150 parts of Portland cement,

[0065] 33 parts of modified waste tire rubber powder,

[0066] 7 parts of modified lignin,

[0067] 10 parts of modified polyvinyl alcohol fiber,

[0068] 34 parts fly ash,

[0069] 14 parts of coarse aggregate crushed stone,

[0070] 40 parts of graded coarse quartz sand,

[0071] 35 parts of graded fine quartz sand,

[0072] 6 parts of aluminum powder,

[0073] 7 parts quicklime powder,

[0074] 3 parts of calcium polyacrylate,

[0075] 2 parts of sodium isopropylnaphthalenesulfonate,

[0076] 5 parts of calcium lignin sulfonate,

[0077] 0.8 parts of polyether-modified heptamethyltrisiloxane,

[0078] 180 parts water;

[0079] The silicate cement is ordinary silicate cement, with the designation 52.5R;

[0080] The particle size of the fly ash is 7 μm;

[0081] The particle size of the coarse aggregate gravel is 13 mm;

[0082] For the graded coarse quartz sand, its moisture content is 0.20%, the maximum particle size is 5.50 mm, the mud content and powder content are 0.10%, and it has a four - stage continuous grading of 1.20 mm, 2.10 mm, 4.30 mm, and 5.50 mm;

[0083] For the graded fine quartz sand, its moisture content is 0.10%, the maximum particle size is 0.90 mm, the mud content and powder content are 0.05%, and it has a four - stage continuous grading of 0.20 mm, 0.45 mm, 0.65 mm, and 0.90 mm;

[0084] The particle size of the aluminum powder is 3 μm;

[0085] The particle size of the quicklime powder is 15 μm;

[0086] For the self - cleaning fiber - reinforced inner - hydrophobic anti - skid wear - resistant porous concrete pavement material, according to the specific formula by weight, put Portland cement, modified waste tire rubber powder, modified lignin, modified polyvinyl alcohol fiber, fly ash, graded coarse quartz sand, and graded fine quartz sand into a mixing kettle for dry mixing. After dry mixing evenly, obtain the powder material. Then mix calcium polyacrylate, sodium isopropylnaphthalenesulfonate, calcium lignosulfonate, polyether - modified heptamethyltrisiloxane, and water and stir well to dissolve to obtain the liquid material. Then add the powder material and the liquid material into a mixer and stir evenly to obtain the slurry, which is the porous concrete pavement material available for paving.

[0087] Example 2: A self - cleaning fiber - reinforced inner - hydrophobic anti - skid wear - resistant porous concrete pavement material

[0088] Step 1: Preparation of modified waste tire rubber powder

[0089] After grinding the waste tire rubber powder into a powder with a particle size of 1 μm, add it to a high - pressure reaction kettle, and then add dichloroisocyanuric acid, 4 - toluenesulfonyl chloride, ethanol, and acetone. Heat up to 75 °C, and at the same time pressurize with nitrogen to 0.5 MPa. After reacting at a constant temperature for 4 hours, relieve the pressure and cool down to room temperature. Discharge and filter. The filtered solid is dried at 50 °C for 2 hours to obtain the modified waste tire rubber powder;

[0090] The mass ratio of the waste tire rubber powder, dichloroisocyanuric acid, 4 - toluenesulfonyl chloride, ethanol, and acetone is 20:4:2:40:20.

[0091] Step 2: Preparation of modified lignin

[0092] After crushing lignin into a powder with a particle size of 1 μm, it is added to a high-speed dispersion and mixing kettle. Then, p-xylene and diethanolamide oleate are added, and the high-speed dispersion impeller is started. Under the condition of controlling the rotation speed at 16,000 revolutions per minute, high-speed homogenizing dispersion is carried out for 3 hours. After stopping the homogenizing dispersion, stirring is started. At a stirring rate of 1,000 revolutions per minute, 2,5-dichlorophenyl isocyanate and sodium methyl silicate are added, and the temperature is raised to 125 °C. After constant temperature reflux reaction for 3 hours, it is cooled to room temperature, and the material is discharged and filtered. The filtered solid is washed 3 times with absolute ethanol and then dried at 75 °C for 1 hour to obtain modified lignin;

[0093] The mass ratio of the lignin, p-xylene, diethanolamide oleate, 2,5-dichlorophenyl isocyanate and sodium methyl silicate is 30:140:5:6:10.

[0094] Step 3: Preparation of modified polyvinyl alcohol fibers

[0095] The polyvinyl alcohol fibers, sodium lignosulfonate, sodium hexametaphosphate, methacryloyloxyethyl trimethyl ammonium chloride and deionized water are added to a mixing kettle. The stirring rate is controlled at 150 revolutions per minute, and the temperature in the mixing kettle is kept constant at 40 °C. After constant temperature stirring reaction for 6 hours, it is cooled to room temperature, and the material is discharged and filtered. The obtained solid is dried at 60 °C for 4 hours to obtain modified polyvinyl alcohol fibers;

[0096] The length of the polyvinyl alcohol fibers is 3 mm, the diameter is 10 μm, the breaking strength is 1,100 MPa, and the elastic modulus is 29 GPa;

[0097] The mass ratio of the polyvinyl alcohol fibers, sodium lignosulfonate, sodium hexametaphosphate, methacryloyloxyethyl trimethyl ammonium chloride and deionized water is 40:9:5:4:150.

[0098] Step 4: Preparation of porous concrete pavement materials

[0099] The specific formula of the self-cleaning fiber-reinforced inner-hydrophobic anti-slip and wear-resistant porous concrete pavement material is as follows by weight:

[0100] Portland cement 130 parts,

[0101] Modified waste tire rubber powder 25 parts,

[0102] Modified lignin 5 parts,

[0103] Modified polyvinyl alcohol fibers 4 parts,

[0104] Fly ash 20 parts,

[0105] Coarse aggregate gravel 8 parts,

[0106] Graded coarse quartz sand 25 parts,

[0107] 30 parts of graded fine quartz sand,

[0108] 3 parts of aluminum powder,

[0109] 4 parts of quicklime powder,

[0110] 2 parts of calcium polyacrylate,

[0111] 1 part of sodium isopropylnaphthalenesulfonate,

[0112] 2 parts of calcium lignosulfonate,

[0113] 0.5 part of polyether-modified heptamethyltrisiloxane,

[0114] 150 parts of water;

[0115] The portland cement is ordinary portland cement with a grade of 52.5R;

[0116] The particle size of the fly ash is 1 μm;

[0117] The particle size of the coarse aggregate gravel is 7 mm;

[0118] The graded coarse quartz sand has a moisture content of 0.30%, a maximum particle size of 6.00 mm, a mud content and a powder content of 0.15%, and a four-stage continuous grading of 1.00 mm, 1.51 mm, 3.01 mm, and 5.01 mm;

[0119] The graded fine quartz sand has a moisture content of 0.20%, a maximum particle size of 1.00 mm, a mud content and a powder content of 0.10%, and a four-stage continuous grading of 0.10 mm, 0.31 mm, 0.51 mm, and 0.85 mm;

[0120] The particle size of the aluminum powder is 1 μm;

[0121] The particle size of the quicklime powder is 5 μm;

[0122] According to the specific formula of the self-cleaning fiber-reinforced inner hydrophobic, anti-slip, wear-resistant porous concrete pavement material in parts by weight, put the portland cement, modified waste tire rubber powder, modified lignin, modified polyvinyl alcohol fiber, fly ash, graded coarse quartz sand, and graded fine quartz sand into a mixing kettle for dry mixing. After dry mixing evenly, obtain the powder material. Then mix calcium polyacrylate, sodium isopropylnaphthalenesulfonate, calcium lignosulfonate, polyether-modified heptamethyltrisiloxane, and water and stir well to dissolve to obtain the liquid material. Then add the powder material and the liquid material into a mixer and stir evenly. The obtained slurry is the porous concrete pavement material for paving.

[0123] Example 3: A self-cleaning fiber-reinforced inner hydrophobic, anti-slip, wear-resistant porous concrete pavement material

[0124] Step 1. Preparation of modified waste tire rubber powder

[0125] After grinding waste tire rubber powder into powder with a particle size of 12 μm, it is added to a high-pressure reactor, and then dichloroisocyanuric acid, 4-toluenesulfonyl chloride, ethanol and acetone are added. The temperature is raised to 90 °C, and at the same time, nitrogen is pressurized to 1.5 MPa. After reacting at a constant temperature for 8 hours, the pressure is released and the temperature is lowered to room temperature. The material is discharged and filtered. The filtered solid is dried at 65 °C for 4 hours to obtain modified waste tire rubber powder;

[0126] The mass ratio of the waste tire rubber powder, dichloroisocyanuric acid, 4-toluenesulfonyl chloride, ethanol and acetone is 40:9:7:70:35.

[0127] Step 2: Preparation of modified lignin

[0128] After crushing lignin into powder with a particle size of 5 μm, it is added to a high-speed dispersion and mixing kettle, and then p-xylene and diethanolamide oleate are added. The high-speed dispersion paddle is turned on, and high-speed homogenizing dispersion is carried out at a rotation speed of 25,000 revolutions per minute for 6 hours. The homogenizing dispersion is stopped, and stirring is started. At a stirring rate of 2,000 revolutions per minute, 2,5-dichlorophenyl isocyanate and sodium methyl silicate are added. The temperature is raised to 150 °C, and after reacting under constant temperature reflux for 6 hours, the temperature is lowered to room temperature. The material is discharged and filtered. The filtered solid is washed 5 times with absolute ethanol and then dried at 95 °C for 4 hours to obtain modified lignin;

[0129] The mass ratio of the lignin, p-xylene, diethanolamide oleate, 2,5-dichlorophenyl isocyanate and sodium methyl silicate is 50:180:8:12:18.

[0130] Step 3: Preparation of modified polyvinyl alcohol fiber

[0131] Polyvinyl alcohol fiber, sodium lignosulfonate, sodium hexametaphosphate, methacryloyloxyethyl trimethyl ammonium chloride and deionized water are added to a mixing kettle. The stirring rate is controlled at 340 revolutions per minute, and the temperature in the mixing kettle is kept constant at 60 °C. After reacting with constant stirring for 10 hours, it is cooled to room temperature. The material is discharged and filtered. The obtained solid is dried at 80 °C for 7 hours to obtain modified polyvinyl alcohol fiber;

[0132] The length of the polyvinyl alcohol fiber is 6 mm, the diameter is 40 μm, the breaking strength is 1300 MPa, and the elastic modulus is 33 GPa;

[0133] The mass ratio of the polyvinyl alcohol fiber, sodium lignosulfonate, sodium hexametaphosphate, methacryloyloxyethyl trimethyl ammonium chloride and deionized water is 65:14:10:9:200.

[0134] Step 4: Preparation of porous concrete pavement material

[0135] The specific formula of the self-cleaning fiber-reinforced inner hydrophobic, anti-slip and wear-resistant porous concrete pavement material is as follows, by weight:

[0136] Portland cement: 160 parts

[0137] Modified waste tire rubber powder: 39 parts

[0138] Modified lignin: 10 parts

[0139] Modified polyvinyl alcohol fiber: 11 parts

[0140] Fly ash: 40 parts

[0141] Coarse aggregate crushed stone: 18 parts

[0142] Graded coarse quartz sand: 45 parts

[0143] Graded fine quartz sand: 50 parts

[0144] Aluminum powder: 7 parts

[0145] Quicklime powder: 8 parts

[0146] Calcium polyacrylate: 6 parts

[0147] Sodium isopropylnaphthalenesulfonate: 3 parts

[0148] Calcium lignosulfonate: 6 parts

[0149] Polyether-modified heptamethyltrisiloxane: 1 part

[0150] Water: 230 parts

[0151] The Portland cement is ordinary Portland cement with a grade of 52.5R;

[0152] The particle size of the fly ash is 10 μm;

[0153] The particle size of the coarse aggregate crushed stone is 20 mm;

[0154] For the graded coarse quartz sand, its moisture content is 0.30%, the maximum particle size is 6.00 mm, the mud content and powder content are 0.15%, and it has a four-stage continuous grading of 1.50 mm, 3.00 mm, 5.00 mm, and 5.99 mm;

[0155] For the graded fine quartz sand, its moisture content is 0.20%, the maximum particle size is 1.00 mm, the mud content and powder content are 0.10%, and it has a four-stage continuous grading of 0.30 mm, 0.50 mm, 0.85 mm, and 0.99 mm;

[0156] The particle size of the aluminum powder is 5 μm;

[0157] The particle size of the quicklime powder is 20 μm;

[0158] According to the specific formula of the self-cleaning fiber-reinforced internal hydrophobic, anti-skid and wear-resistant porous concrete pavement material in parts by weight, silicate cement, modified waste tire rubber powder, modified lignin, modified polyvinyl alcohol fiber, fly ash, graded coarse quartz sand and graded fine quartz sand are placed in a mixing kettle for dry mixing to obtain a powder after dry mixing. Calcium polyacrylate, sodium isopropylnaphthalene sulfonate, calcium lignin sulfonate, polyether-modified heptamethyltrisiloxane and water are then mixed and fully stirred to dissolve to obtain a liquid material. The powder and the liquid material are then added to a mixer and stirred evenly to obtain a slurry that is the porous concrete pavement material that can be paved.

[0159] Comparative Example 1: Based on Example 1, step 1, preparation of modified scrap tire rubber powder, was omitted. In step 4, preparation of porous concrete pavement material, 33 parts of modified scrap tire rubber powder were replaced with 33 parts of scrap tire rubber powder. The specific operation was as follows:

[0160] Step 1, preparation of modified waste tire rubber powder, is not performed;

[0161] The operations of steps 2 and 3 are the same as those in Example 1;

[0162] Step 4: Preparation of porous concrete pavement materials

[0163] The specific formula of the self-cleaning fiber-reinforced internally hydrophobic anti-skid and wear-resistant porous concrete pavement material is as follows, in parts by weight:

[0164] 150 parts of Portland cement,

[0165] 33 parts of waste tire rubber powder,

[0166] 7 parts of modified lignin,

[0167] 10 parts of modified polyvinyl alcohol fiber,

[0168] 34 parts fly ash,

[0169] 14 parts of coarse aggregate crushed stone,

[0170] 40 parts of graded coarse quartz sand,

[0171] 35 parts of graded fine quartz sand,

[0172] 6 parts of aluminum powder,

[0173] 7 parts quicklime powder,

[0174] 3 parts of calcium polyacrylate,

[0175] 2 parts of sodium isopropylnaphthalenesulfonate,

[0176] 5 parts of calcium lignin sulfonate,

[0177] 0.8 parts of polyether-modified heptamethyltrisiloxane,

[0178] 180 parts of water;

[0179] The portland cement is ordinary portland cement with a grade of 52.5R;

[0180] The particle size of the waste tire rubber powder is 7 μm;

[0181] The particle size of the fly ash is 7 μm;

[0182] The particle size of the coarse aggregate gravel is 13 mm;

[0183] The graded coarse quartz sand has a moisture content of 0.20%, a maximum particle size of 5.50 mm, a mud content and a powder content of 0.10%, and a four-stage continuous grading of 1.20 mm, 2.10 mm, 4.30 mm, and 5.50 mm;

[0184] The graded fine quartz sand has a moisture content of 0.10%, a maximum particle size of 0.90 mm, a mud content and a powder content of 0.05%, and a four-stage continuous grading of 0.20 mm, 0.45 mm, 0.65 mm, and 0.90 mm;

[0185] The particle size of the aluminum powder is 3 μm;

[0186] The particle size of the quicklime powder is 15 μm;

[0187] According to the specific formula of the self-cleaning fiber-reinforced inner-hydrophobic anti-slip wear-resistant porous concrete pavement material in parts by weight, put the portland cement, waste tire rubber powder, modified lignin, modified polyvinyl alcohol fiber, fly ash, graded coarse quartz sand, and graded fine quartz sand into a mixing kettle for dry mixing. After dry mixing evenly, obtain the powder material. Then mix calcium polyacrylate, isopropylnaphthalenesulfonate, calcium lignosulfonate, polyether-modified heptamethyltrisiloxane, and water and stir well to dissolve to obtain the liquid material. Then add the powder material and the liquid material into a mixer and stir evenly. The obtained slurry is the porous concrete pavement material available for paving.

[0188] Comparative Example 2: On the basis of Example 1, do not perform Step 2, the preparation of modified lignin, and replace 7 parts of modified lignin with 7 parts of lignin in equal amount in Step 4, the preparation of the porous concrete pavement material. The specific operation is as follows:

[0189] The operation of Step 1 is the same as that of Example 1;

[0190] Do not perform Step 2, the preparation of modified lignin;

[0191] The operation of Step 3 is the same as that of Example 1;

[0192] Step 4: Preparation of porous concrete pavement materials

[0193] The specific formula of the self-cleaning fiber-reinforced inner-hydrophobic anti-slip and wear-resistant porous concrete pavement materials is as follows (by weight):

[0194] Portland cement: 150 parts

[0195] Modified waste tire rubber powder: 33 parts

[0196] Lignin: 7 parts

[0197] Modified polyvinyl alcohol fiber: 10 parts

[0198] Fly ash: 34 parts

[0199] Coarse aggregate gravel: 14 parts

[0200] Graded coarse quartz sand: 40 parts

[0201] Graded fine quartz sand: 35 parts

[0202] Aluminum powder: 6 parts

[0203] Quicklime powder: 7 parts

[0204] Calcium polyacrylate: 3 parts

[0205] Sodium isopropylnaphthalenesulfonate: 2 parts

[0206] Calcium lignosulfonate: 5 parts

[0207] Polyether-modified heptamethyltrisiloxane: 0.8 part

[0208] Water: 180 parts

[0209] The Portland cement is ordinary Portland cement with a grade of 52.5R;

[0210] The particle size of the lignin is 2μm;

[0211] The particle size of the fly ash is 7μm;

[0212] The particle size of the coarse aggregate gravel is 13mm;[[ID=X]] [[ID=X]]

[0213] For the graded coarse quartz sand, its moisture content is 0.20%, the maximum particle size is 5.50mm, the mud content and powder content are 0.10%, and it has a four-stage continuous grading of 1.20mm, 2.10mm, 4.30mm, and 5.50mm;

[0214] For the graded fine quartz sand, its moisture content is 0.10%, the maximum particle size is 0.90mm, the mud content and powder content are 0.05%, and it has a four-stage continuous grading of 0.20mm, 0.45mm, 0.65mm, and 0.90mm;

[0215] The particle size of the aluminum powder is 3 μm;

[0216] The particle size of the quicklime powder is 15 μm;

[0217] According to the specific formula of the self-cleaning fiber-reinforced inner hydrophobic, anti-slip, wear-resistant porous concrete pavement material by weight, put Portland cement, modified waste tire rubber powder, lignin, modified polyvinyl alcohol fiber, fly ash, graded coarse quartz sand, and graded fine quartz sand into a mixing kettle for dry mixing. After dry mixing evenly, obtain a powder material. Then mix calcium polyacrylate, isopropyl naphthalenesulfonate, calcium lignosulfonate, polyether-modified heptamethyltrisiloxane, and water and stir well to dissolve to obtain a liquid material. Then add the powder material and the liquid material into a mixer and stir evenly. The obtained slurry is the porous concrete pavement material ready for paving.

[0218] Comparative Example 3: On the basis of Example 1, do not perform Step 3, the preparation of modified polyvinyl alcohol fiber, and in Step 4, the preparation of the porous concrete pavement material, replace 10 parts of the modified polyvinyl alcohol fiber with 10 parts of polyvinyl alcohol fiber in equal amount. The specific operation is as follows:

[0219] The operations of Steps 1 and 2 are the same as those in Example 1;

[0220] Do not perform Step 3, the preparation of modified polyvinyl alcohol fiber;

[0221] Step 4, the preparation of the porous concrete pavement material

[0222] The specific formula of the self-cleaning fiber-reinforced inner hydrophobic, anti-slip, wear-resistant porous concrete pavement material, by weight, is as follows:

[0223] Portland cement 150 parts,

[0224] Modified waste tire rubber powder 33 parts,

[0225] Modified lignin 7 parts,

[0226] Polyvinyl alcohol fiber 10 parts,

[0227] Fly ash 34 parts,

[0228] Coarse aggregate gravel 14 parts,

[0229] Graded coarse quartz sand 40 parts,

[0230] Graded fine quartz sand 35 parts,

[0231] Aluminum powder 6 parts,

[0232] Quicklime powder 7 parts,

[0233] Calcium polyacrylate 3 parts,

[0234] 2 parts of sodium isopropylnaphthalenesulfonate,

[0235] 5 parts of calcium lignosulfonate,

[0236] 0.8 part of polyether-modified heptamethyltrisiloxane,

[0237] 180 parts of water;

[0238] The portland cement is ordinary portland cement with a grade of 52.5R;

[0239] The length of the polyvinyl alcohol fiber is 4 mm, the diameter is 35 μm, the breaking strength is 1250 MPa, and the elastic modulus is 31 GPa;

[0240] The particle size of the fly ash is 7 μm;

[0241] The particle size of the coarse aggregate gravel is 13 mm;

[0242] The graded coarse quartz sand has a moisture content of 0.20%, a maximum particle size of 5.50 mm, a mud content and a powder content of 0.10%, and a four-stage continuous grading of 1.20 mm, 2.10 mm, 4.30 mm, and 5.50 mm;

[0243] The graded fine quartz sand has a moisture content of 0.10%, a maximum particle size of 0.90 mm, a mud content and a powder content of 0.05%, and a four-stage continuous grading of 0.20 mm, 0.45 mm, 0.65 mm, and 0.90 mm;

[0244] The particle size of the aluminum powder is 3 μm;

[0245] The particle size of the quicklime powder is 15 μm;

[0246] According to the specific formula of the self-cleaning fiber-reinforced inner-hydrophobic anti-slip wear-resistant porous concrete pavement material in parts by weight, put the portland cement, modified waste tire rubber powder, modified lignin, polyvinyl alcohol fiber, fly ash, graded coarse quartz sand, and graded fine quartz sand into a mixing kettle for dry mixing. After dry mixing evenly, obtain the powder material. Then mix calcium polyacrylate, sodium isopropylnaphthalenesulfonate, calcium lignosulfonate, polyether-modified heptamethyltrisiloxane, and water and stir well to dissolve to obtain the liquid material. Then add the powder material and the liquid material into a mixer and stir evenly. The obtained slurry is the porous concrete pavement material available for paving.

[0247] Performance test:

[0248] Test the following performance indicators of the self-cleaning fiber-reinforced inner-hydrophobic anti-slip wear-resistant porous concrete pavement materials obtained in Examples 1, 2, 3 and Comparative Examples 1, 2, 3:

[0249] 1. Compressive strength: Refer to GB / T50081-2002 "Standard Test Method for Mechanical Properties of Ordinary Concrete" to test the 28-day compressive strength of porous concrete pavement materials;

[0250] 2. Flexural strength: Refer to GB / T50081-2002 "Standard Test Method for Mechanical Properties of Ordinary Concrete" to test the 28-day flexural strength of porous concrete pavement materials;

[0251] 3. Hydrophobic property: Characterize the hydrophobic property by testing the contact angle of the surface and the 3-cm-thick cross-section of porous concrete pavement materials;

[0252] 4. Permeability coefficient: Conduct the test with reference to CJJ / T135-2009 "Technical Specification for Permeable Cement Concrete Pavement";

[0253] 5. Abrasion resistance: Refer to T0567-2005 "Test Method for Abrasion Resistance of Cement Concrete" in JTG E30-2005 "Test Regulations for Cement and Cement Concrete in Highway Engineering" to test the wear volume in 28 days;

[0254] 6. Skid resistance: Refer to the test method of "Determination of Road Surface Friction Coefficient by Pendulum Tester" in JTG E60-2008 "Field Test Regulations for Highway Subgrade and Pavement" to test the BPN value of pavement materials. The larger the BPN value, the better the skid resistance ability;

[0255] 7. Durability evaluation: Refer to GB / T50082-2009 to test the number of freeze-thaw cycles of porous concrete pavement materials, and evaluate the durability by the maximum number of freeze-thaw cycles when cracks appear;

[0256] The above test results are shown in Table 1:

[0257] Table 1

[0258] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Compressive strength (MPa) 43.4 41.2 42.5 29.4 32.9 21.3 Flexural strength (MPa) 5.3 5.8 5.1 1.6 2.4 1.9 Hydrophobic property, contact angle (°) 119 124 116 25 33 64 Permeability coefficient (mm / s) 8.0 8.2 7.7 4.6 5.1 6.2 <![CDATA[Wear resistance, wear volume in 28 days (kg / m 2 )]]> 0.39 0.42 0.34 1.82 1.05 1.63 Skid resistance performance, BPN value 72 68 69 40 47 55 Durability, maximum number of freeze-thaw cycles 185 191 189 82 164 109

[0259] As can be seen from the data in Table 1, for Comparative Example 1 where the waste tire rubber powder is not modified, the compressive strength and flexural strength are much lower than those of the three Examples. The hydrophobic property and water permeability coefficient are reduced to the lowest level, and at the same time, the wear resistance, skid resistance, and durability are all reduced to the lowest level. This indicates that it is difficult for the unmodified waste tire rubber powder to be uniformly dispersed in the concrete matrix, thus affecting the various properties of the concrete. In Comparative Example 2, the lignin is not modified. The compressive strength and flexural strength of Comparative Example 2 are significantly decreased, the hydrophobicity becomes worse, the water permeability coefficient becomes smaller, and at the same time, the wear resistance is also significantly reduced, the skid resistance becomes worse, and the durability is also significantly deteriorated. This shows that when the lignin is not modified, due to the strong hydrogen bond interaction on its surface, it is difficult to disperse, and it is easy to form aggregates in the concrete matrix, resulting in the deterioration of the concrete properties. In Comparative Example 3, the surface of the polyvinyl alcohol fiber incorporated is not modified, and the mechanical properties of the concrete are reduced to the lowest level. The hydrophobicity and water permeability coefficient are also significantly reduced, and the wear resistance, skid resistance, and durability are also significantly affected. This shows that appropriate surface modification of the polyvinyl alcohol fiber can change the bonding mode between the polyvinyl alcohol fiber and the concrete matrix and improve the role of the polyvinyl alcohol fiber in enhancing and toughening the concrete.

[0260] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, should be covered within the protection scope of the present invention.

Claims

1. A self-cleaning fiber-reinforced inner-hydrophobic anti-slip wear-resistant porous concrete pavement material, characterized in that: The specific formula of the self-cleaning fiber-reinforced inner-hydrophobic anti-slip wear-resistant porous concrete pavement material is as follows by weight: Portland cement 130 - 160 parts, Modified waste tire rubber powder 25 - 39 parts, Modified lignin 5 - 10 parts, Modified polyvinyl alcohol fiber 4 - 11 parts, Fly ash 20 - 40 parts, Coarse aggregate gravel 8 - 18 parts, Graded coarse quartz sand 25 - 45 parts, Graded fine quartz sand 30 - 50 parts, Aluminum powder 3 - 7 parts, Quicklime powder 4 - 8 parts, Calcium polyacrylate 2 - 6 parts, Sodium isopropylnaphthalenesulfonate 1 - 3 parts, Calcium lignosulfonate 2 - 6 parts, Polyether-modified heptamethyltrisiloxane 0.5 - 1 part, Water 150 - 230 parts; The preparation method of the modified waste tire rubber powder is as follows: Grind the waste tire rubber powder into powder with a particle size of 1 - 12 μm, then add it to a high-pressure reactor, and then add dichloroisocyanuric acid, 4-toluenesulfonyl chloride, ethanol and acetone. Heat up to 75 - 90 °C, and at the same time pressurize with nitrogen to 0.5 - 1.5 MPa. Keep the temperature constant and react for 4 - 8 hours, then relieve the pressure and cool down to room temperature. Discharge and filter. The filtered solid is dried at 50 - 65 °C for 2 - 4 hours to obtain the modified waste tire rubber powder; The preparation method of the modified lignin is as follows: Crush the lignin into powder with a particle size of 1 - 5 μm, then add it to a high-speed dispersion and mixing kettle, and then add p-xylene and diethanolamide oleate. Then turn on the high-speed dispersion impeller and control the high-speed homogenizing dispersion at a rotation speed of 16000 - 25000 rpm for 3 - 6 hours. Stop the homogenizing dispersion and turn on the stirring. At a stirring rate of 1000 - 2000 rpm, add 2,5-dichlorophenyl isocyanate and sodium methyl silicate, heat up to 125 - 150 °C, and keep the temperature constant and reflux for 3 - 6 hours. Then cool down to room temperature, discharge and filter. The filtered solid is washed with anhydrous ethanol 3 - 5 times, and then dried at 75 - 95 °C for 1 - 4 hours to obtain the modified lignin; The preparation method of the modified polyvinyl alcohol fiber is as follows: Add polyvinyl alcohol fiber, sodium lignosulfonate, sodium hexametaphosphate, methylacryloyloxyethyl trimethyl ammonium chloride and deionized water into a mixing kettle, control the stirring rate at 150 - 340 rpm, keep the temperature in the mixing kettle constant at 40 - 60 °C, and carry out constant-temperature stirring reaction for 6 - 10 hours. Then cool down to room temperature, discharge and filter. The obtained solid is dried at 60 - 80 °C for 4 - 7 hours to obtain the modified polyvinyl alcohol fiber.

2. The self-cleaning fiber-reinforced inner-hydrophobic anti-slip wear-resistant porous concrete pavement material according to claim 1, characterized in that: The Portland cement is ordinary Portland cement with a grade of 52.5R; The particle size of the fly ash is 1 - 10 μm; The particle size of the coarse aggregate gravel is 7 - 20 mm; The graded coarse quartz sand has a moisture content ≤ 0.30%, a maximum particle size ≤ 6.00 mm, a mud content and powder content ≤ 0.15%, and a four-stage continuous grading of 1.00 - 1.50 mm, 1.51 - 3.00 mm, 3.01 - 5.00 mm, and 5.01 - 5.99 mm; The graded fine quartz sand has a moisture content of 0.10%, a maximum particle size of 0.90 mm, a mud content and powder content of 0.05%, and a four-stage continuous grading of 0.20 mm, 0.45 mm, 0.65 mm, and 0.90 mm; The particle size of the aluminum powder is 1 - 5 μm; The particle size of the quicklime powder is 5 - 20 μm.

3. The self-cleaning fiber-reinforced inner hydrophobic anti-slip wear-resistant porous concrete pavement material according to claim 1, characterized in that: The mass ratio of the waste tire rubber powder, dichloroisocyanuric acid, 4-toluenesulfonyl chloride, ethanol, and acetone is 20 - 40:4 - 9:2 - 7:40 - 70:20 - 35; The mass ratio of the lignin, p-xylene, diethanolamide oleate, 2,5-dichlorophenyl isocyanate, and sodium methyl silicate is 30 - 50:14 * 0 - 180:5 - 8:6 - 12:10 - 18; The length of the polyvinyl alcohol fiber is 3 - 6 mm, the diameter is 10 - 40 μm, the breaking strength is 1100 - 1300 MPa, and the elastic modulus is 29 - 33 GPa; The mass ratio of the polyvinyl alcohol fiber, sodium lignosulfonate, sodium hexametaphosphate, methacryloyloxyethyl trimethyl ammonium chloride, and deionized water is 40 - 65:9 - 14:5 - 10:4 - 9:150 - 200.

4. The self-cleaning fiber-reinforced inner hydrophobic anti-slip wear-resistant porous concrete pavement material according to claim 1, characterized in that: According to the specific formula of the self-cleaning fiber-reinforced inner hydrophobic anti-slip wear-resistant porous concrete pavement material in parts by weight, put Portland cement, modified waste tire rubber powder, modified lignin, modified polyvinyl alcohol fiber, fly ash, graded coarse quartz sand, and graded fine quartz sand into a mixing kettle for dry mixing. After dry mixing evenly, obtain a powder. Then mix calcium polyacrylate, isopropyl naphthalenesulfonate, calcium lignosulfonate, polyether-modified heptamethyltrisiloxane, and water and stir well to dissolve to obtain a liquid material. Then add the powder and the liquid material into a mixer and stir evenly. The obtained slurry is the porous concrete pavement material available for paving.