Permeable asphalt pavement material and preparation method thereof

Abstract

The present invention provides a permeable asphalt pavement material and a preparation method thereof, belonging to the technical field of asphalt pavement materials. The pavement material comprises the following components by weight: 20-30 parts cement, 50-60 parts modified asphalt, 20-30 parts coarse aggregate, 10-20 parts fine aggregate, 5-10 parts reinforcing fiber, and 20-40 parts water. The resulting permeable asphalt pavement material exhibits excellent deformation resistance and water permeability, can extend the service life of roads, and mitigate the urban heat island effect.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt pavement materials, and in particular to a permeable asphalt pavement material and a preparation method thereof. Background Art

[0002] Permeable asphalt pavement, also known as PA pavement or OGFC pavement, is a newly developed pavement structure. It is an improvement on drainable asphalt pavement. Both the surface layer and the base layer have an open gradient large-void structure. This high-porosity structure effectively reduces surface rainwater runoff, ensuring driving safety. The through-pores also absorb and reduce noise, improving road service quality. Permeable asphalt pavement has excellent ecological benefits and can regulate surface temperature and humidity.

[0003] With the acceleration of economic and urban construction, my country's road construction has entered the stage of high-grade road construction. The performance and construction process requirements for high-grade roads such as expressways, first-class highways, and urban main roads have been significantly improved. In particular, in order to cope with extreme weather and increase the service life of roads, permeable asphalt pavement materials are required to have higher thermal deformation temperature and deformation resistance to mitigate the urban heat island effect.

[0004] Chinese patent document CN112897959A discloses a permeable high-strength asphalt concrete and a preparation method thereof, comprising the following substances in parts by weight: 10 to 15 parts asphalt base, 15 to 20 parts mixed aggregate, 25 to 30 parts mineral powder, 45 to 50 parts cement and 10 to 15 parts reinforcing filler, wherein the reinforcing filler comprises polyester fiber and basalt fiber mixed in a mass ratio of 1:2 to 5; the preparation method comprises: S1, first taking the asphalt base for standby use, then mixing the mixed aggregate, mineral powder, cement and reinforcing filler according to a formula, and collecting the mixture; S2, mixing the asphalt base and the mixture and stirring them to collect the permeable high-strength asphalt concrete material; the permeable high-strength asphalt concrete of the present application can be used for road and bridge pavement, and it has excellent mechanical strength and permeability, thereby improving the durability of the permeable asphalt concrete material. The reinforcing fillers used in this invention are polyester fibers, basalt fibers and porous glass fibers, which have the defects of poor compatibility between the fibers and asphalt pavement materials and easy breakage of the porous structure during repeated rolling of vehicles, thereby reducing the water permeability of the material matrix. Summary of the Invention

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a permeable asphalt pavement material with good deformation resistance and good water permeability.

[0006] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a permeable asphalt pavement material comprising the following components in parts by weight: 20-30 parts of cement, 50-60 parts of modified asphalt, 20-30 parts of coarse aggregate, 10-20 parts of fine aggregate, 5-10 parts of reinforcing fiber, and 20-40 parts of water.

[0008] Preferably, the preparation method of the modified asphalt is as follows:

[0009] Dissolve trimethylolpropane and 2-hydroxyphenylacetic acid in N,N-dimethylformamide, then dropwise add a solution of N,N'-dicyclohexylcarbodiimide in N,N-dimethylformamide, react at 0-10°C for 3-5 hours, centrifuge after completion of the reaction, and collect the supernatant; add water to the supernatant, stir, collect the organic phase, and evaporate the organic phase under reduced pressure to remove the solvent to obtain a modifier; heat the asphalt to 100-150°C, add PEG-200, rubber powder, and styrene-butadiene-styrene, stir, then heat to 160-180°C, continue stirring for 1-2 hours, add the modifier and petroleum resin, and stir to obtain a modifier-modified asphalt.

[0010] Preferably, the mass ratio of trimethylolpropane to 2-hydroxyphenylacetic acid is 1:7-12.

[0011] Preferably, the mass ratio of the asphalt, PEG-200, rubber powder, styrene-butadiene-styrene, modifier and petroleum resin is 8-11:2-3:1-2:2-3:1-2.

[0012] Preferably, the asphalt is petroleum asphalt.

[0013] Preferably, the coarse aggregate is basalt crushed stone, granite crushed stone or a mixture of the two.

[0014] Preferably, the fine aggregate is river sand, yellow sand or a mixture of the two.

[0015] Preferably, the reinforcing fiber is obtained by grafting a silane coupling agent onto a plasma-treated polypropylene fiber, and the preparation method is as follows: the polypropylene fiber is plasma-treated and then immersed in a sodium hydroxide aqueous solution, a silane coupling agent is added and stirred for reaction, and the reinforcing fiber is taken out and dried to obtain the reinforcing fiber.

[0016] Further preferably, the plasma treatment conditions are: power 60-100 W, vacuum degree 25-35 Pa, and treatment time 3-5 min.

[0017] Further preferably, the concentration of the sodium hydroxide aqueous solution is 0.1-1 mol / L.

[0018] Further preferably, the mass ratio of the polypropylene fiber to the silane coupling agent is 10-15:1.

[0019] In a second aspect, the present invention provides a method for preparing the above-mentioned permeable asphalt pavement material as follows: weigh the raw materials according to the formula, heat the asphalt to a molten state, add cement, coarse aggregate, fine aggregate, reinforcing fiber, and water and stir thoroughly to obtain the permeable asphalt pavement material.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. This invention uses a combination of coarse and fine aggregates as asphalt aggregates. The fine aggregate fills the gaps between the coarse aggregates, effectively improving the stability of the asphalt. Cement, as a powdery, hydraulic inorganic cementitious material, can harden in air or even better in water after adding water. It can also firmly bond the asphalt with the coarse and fine aggregates and fibers, further improving the stability of the asphalt system. Watering and curing during the paving process can cause bonding and hardening, effectively improving the stability and rutting resistance of the asphalt system.

[0022] 2. The modifier of the present invention is a polymer with a cavity, synthesized using trimethylolpropane as a core, 2-hydroxyphenylacetic acid as a polymerization monomer, and N,N'-dicyclohexylcarbodiimide as a dehydrating agent. This facilitates the permeation of water molecules. The molecule has numerous active sites and branches that are less prone to entanglement, increasing the viscosity and flexibility of asphalt. The modifier can form a three-dimensional cross-linked network structure in asphalt, which helps improve the material's water permeability and reduce the retention of accumulated water and rainwater. Furthermore, the modifier can effectively bond with asphalt and aggregate, enhancing the locking force between aggregate and asphalt, raising the softening point of asphalt concrete, and thereby improving the pavement's resistance to deformation, which helps extend the pavement's service life.

[0023] 3. After the reinforcing fiber of the present invention is treated with plasma, surface micro-pits can be formed on the fiber surface, which is beneficial to improving the surface roughness of the fiber. Under alkaline conditions, the silicon-hydrogen bond (Si-H bond) of the silane coupling agent can react with the active hydrogen atoms on the surface of polypropylene to form a covalent bond, thereby realizing the connection between the coupling agent and polypropylene, which can effectively improve the interfacial compatibility between polypropylene fiber and asphalt, and is beneficial to the combination of the reinforcing fiber and the modifier in the modified asphalt, thereby enhancing its mechanical bite force with the modified asphalt, and thus improving the bonding force between the fiber and the material matrix, thereby enhancing the toughness of the pavement material and further improving the deformation resistance of the pavement. DETAILED DESCRIPTION

[0024] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are described clearly and completely below. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0025] The sources of some of the raw materials for this method are as follows:

[0026] Basalt crushed stone, particle size 1-50μm, Lingshou County Haibin Mineral Products Trading Co., Ltd.

[0027] Yellow sand, porosity 0.001%, apparent density 1800kg / m 3 , Wuhan Fuxing Shunyuan Building Materials Co., Ltd.

[0028] Asphalt, softening point 75.3℃, elongation 32.5cm at 5℃, elongation 100cm at 15℃, needle penetration 52.3mm, model 10#, Shenzhen Zhongheng Asphalt Engineering Co., Ltd.

[0029] Example 1

[0030] A preparation method of a permeable asphalt pavement material is as follows: 600g of modified petroleum asphalt is heated to 150°C to be in a molten state, 300g of cement, 300g of basalt gravel, 200g of yellow sand, 100g of reinforcing fiber, and 400g of water are added, and the mixture is stirred at 750rpm for 30 minutes to obtain the permeable asphalt pavement material.

[0031] The preparation method of the modified petroleum asphalt is as follows:

[0032] 1.35 g of trimethylolpropane and 13.2 g of 2-hydroxyphenylacetic acid were dissolved in 200 mL of N,N-dimethylformamide, and then 20 mL of a 0.5 g / mL solution of N,N'-dicyclohexylcarbodiimide in N,N-dimethylformamide was added dropwise at a rate of 2 drops / second. The mixture was reacted at 0-10°C for 4 h. After completion of the reaction, the mixture was centrifuged and the supernatant was collected. 10 mL of water was added to the supernatant, stirred, and the organic phase was collected. The solvent was evaporated under reduced pressure to obtain a modifier. 55 g of asphalt was heated to 150°C, 15 g of PEG-200, 10 g of rubber powder, and styrene-butadiene-styrene were added, stirred, and then the temperature was raised to 180°C. Stirring was continued for 2 h, and 10 g of the modifier and 15 g of petroleum resin were added and stirred for 30 min to obtain a modified petroleum asphalt.

[0033] The preparation method of the reinforcing fiber is as follows:

[0034] 150g of polypropylene fiber was placed under vacuum conditions with a vacuum degree of 35Pa, plasma treated at a power of 100W for 5 minutes, and then immersed in a 1mol / L sodium hydroxide aqueous solution. 10g of KH-550 was added and stirred for 1 hour. The fiber was taken out and dried to obtain the reinforced fiber.

[0035] Example 2

[0036] A preparation method of a permeable asphalt pavement material is as follows: 500g of modified petroleum asphalt is heated to 140°C to be in a molten state, 200g of cement, 200g of basalt gravel, 100g of yellow sand, 50g of reinforcing fiber, and 200g of water are added, and the mixture is stirred at 750rpm for 20 minutes to obtain the permeable asphalt pavement material.

[0037] The preparation method of the modified petroleum asphalt is as follows:

[0038] 1.35 g of trimethylolpropane and 9.45 g of 2-hydroxyphenylacetic acid were dissolved in 200 mL of N,N-dimethylformamide, and then 16 mL of a 0.5 g / mL solution of N,N'-dicyclohexylcarbodiimide in N,N-dimethylformamide was added dropwise at a rate of 2 drops / second. The mixture was reacted at 0-10°C for 4 h. After completion of the reaction, the mixture was centrifuged and the supernatant was collected. 10 mL of water was added to the supernatant, stirred, and the organic phase was collected. The solvent was evaporated under reduced pressure to obtain a modifier. 40 g of asphalt was heated to 150°C, 10 g of PEG-200, 5 g of rubber powder, and 10 g of styrene-butadiene-styrene were added, stirred, and then the temperature was raised to 180°C. Stirring was continued for 2 h, and 5 g of the modifier and 10 g of petroleum resin were added and stirred for 30 min to obtain a modified petroleum asphalt.

[0039] The preparation method of the reinforcing fiber is as follows:

[0040] 100g of polypropylene fiber was placed under vacuum conditions with a vacuum degree of 25Pa, plasma treated at a power of 60W for 3 minutes, and then immersed in a 0.1mol / L sodium hydroxide aqueous solution. 10g of KH-550 was added and stirred for 1 hour. The reinforced fiber was taken out and dried.

[0041] Example 3

[0042] A preparation method of a permeable asphalt pavement material is as follows: 550g of modified petroleum asphalt is heated to 140°C to a molten state, 250g of cement, 240g of basalt gravel, 160g of yellow sand, 80g of reinforcing fiber, and 310g of water are added, and the mixture is stirred at 750rpm for 40 minutes to obtain the permeable asphalt pavement material.

[0043] The preparation method of the modified petroleum asphalt is as follows:

[0044] 1.35 g of trimethylolpropane and 13.5 g of 2-hydroxyphenylacetic acid were dissolved in 200 mL of N,N-dimethylformamide, and then 18 mL of a 0.5 g / mL solution of N,N'-dicyclohexylcarbodiimide in N,N-dimethylformamide was added dropwise at a rate of 2 drops / second. The mixture was reacted at 0-10°C for 3 h. After completion of the reaction, the mixture was centrifuged and the supernatant was collected. 10 mL of water was added to the supernatant, stirred, and the organic phase was collected. The solvent was evaporated under reduced pressure to obtain a modifier. 30 g of asphalt was heated to 150°C, 9 g of PEG-200, 6 g of rubber powder, and 9 g of styrene-butadiene-styrene were added, stirred, and then the temperature was raised to 180°C. Stirring was continued for 2 h, and 6 g of the modifier and 6 g of petroleum resin were added and stirred for 30 min to obtain a modified petroleum asphalt.

[0045] The preparation method of the reinforcing fiber is as follows:

[0046] 120g of polypropylene fiber was placed under vacuum conditions with a vacuum degree of 30Pa, plasma treated at a power of 80W for 4 minutes, and then immersed in a 0.5mol / L sodium hydroxide aqueous solution. 10g of KH-550 was added and stirred for 1 hour. The fiber was taken out and dried to obtain the reinforced fiber.

[0047] Comparative Example 1

[0048] Similar to Example 1, except that the asphalt used is unmodified petroleum asphalt, the specific steps are as follows:

[0049] A preparation method of a permeable asphalt pavement material is as follows: 600g of petroleum asphalt is heated to 150°C to be in a molten state, 300g of cement, 300g of basalt gravel, 200g of yellow sand, 100g of reinforcing fiber, and 400g of water are added, and the mixture is stirred at 750rpm for 30 minutes to obtain the permeable asphalt pavement material.

[0050] The preparation method of the reinforcing fiber is as follows:

[0051] 150g of polypropylene fiber was placed under vacuum conditions with a vacuum degree of 35Pa, plasma treated at a power of 100W for 5 minutes, and then immersed in a 1mol / L sodium hydroxide aqueous solution. 10g of KH-550 was added and stirred for 1 hour. The fiber was taken out and dried to obtain the reinforced fiber.

[0052] Comparative Example 2

[0053] Similar to Example 1, except that the reinforcing fiber used is polypropylene fiber, the specific steps are as follows:

[0054] A preparation method of a permeable asphalt pavement material is as follows: 600g of modified petroleum asphalt is heated to 150°C to be in a molten state, 300g of cement, 300g of basalt gravel, 200g of yellow sand, 100g of polypropylene fiber, and 400g of water are added, and the mixture is stirred at 750rpm for 30 minutes to obtain the permeable asphalt pavement material.

[0055] The preparation method of the modified petroleum asphalt is as follows:

[0056] 1.35 g of trimethylolpropane and 13.2 g of 2-hydroxyphenylacetic acid were dissolved in 200 mL of N,N-dimethylformamide, and then 20 mL of a 0.5 g / mL N,N'-dicyclohexylcarbodiimide solution in N,N-dimethylformamide was added dropwise at a rate of 2 drops / second. The mixture was reacted at 0-10°C for 4 h. After completion of the reaction, the mixture was centrifuged and the supernatant was collected. 10 mL of water was added to the supernatant, stirred, and the organic phase was collected. The solvent was evaporated under reduced pressure to obtain a modifier. 55 g of asphalt was heated to 150°C, 15 g of PEG-200, 10 g of rubber powder, and styrene-butadiene-styrene were added, stirred, and then the temperature was raised to 180°C. Stirring was continued for 2 h. 10 g of the modifier and 15 g of petroleum resin were added and stirred for 30 min to obtain a modifier-modified asphalt.

[0057] Comparative Example 3

[0058] Similar to Example 1, except that no reinforcing fiber was added, the specific steps are as follows:

[0059] A preparation method of a permeable asphalt pavement material is as follows: 600g of petroleum asphalt is heated to 150°C to be in a molten state, 300g of cement, 300g of basalt gravel, 200g of yellow sand, and 400g of water are added, and stirred at 750rpm for 30 minutes to obtain the permeable asphalt pavement material.

[0060] The petroleum asphalt is modified petroleum asphalt, and its preparation method is as follows:

[0061] 1.35 g of trimethylolpropane and 13.2 g of 2-hydroxyphenylacetic acid were dissolved in 200 mL of N,N-dimethylformamide, and then 20 mL of a 0.5 g / mL solution of N,N'-dicyclohexylcarbodiimide in N,N-dimethylformamide was added dropwise at a rate of 2 drops / second. The mixture was reacted at 0-10°C for 4 h. After completion of the reaction, the mixture was centrifuged and the supernatant was collected. 10 mL of water was added to the supernatant, stirred, and the organic phase was collected. The solvent was evaporated under reduced pressure to obtain a modifier. 55 g of asphalt was heated to 150°C, 15 g of PEG-200, 10 g of rubber powder, and styrene-butadiene-styrene were added, stirred, and then the temperature was raised to 180°C. Stirring was continued for 2 h, and 10 g of the modifier and 15 g of petroleum resin were added and stirred for 30 min to obtain a modified petroleum asphalt.

[0062] Test Case

[0063] The permeable asphalt pavement materials obtained in Examples 1-3 and Comparative Examples 1-3 were subjected to Marshall test (high temperature deformation resistance), rutting test, and water permeability coefficient test:

[0064] Marshall test: Refer to the standard "Technical Specifications for Highway Asphalt Pavement Construction" (JTG-F40-2004) and the high temperature stability test to test the deformation resistance under high temperature conditions. The high temperature performance test temperature is 50°C. The results are expressed as the maximum stress when the specimen is destroyed - Marshall stability. The greater the stability, the stronger the deformation resistance, which is recorded as MS and the unit is kN.

[0065] Rutting test (high-temperature rutting resistance): This method evaluates high-temperature stability. Standard methods are used to form asphalt mixture slab specimens with dimensions of 300mm × 300mm × 50mm. The test temperature is 60°C ± 0.5°C. The wheel rolling conditions are as follows: the contact pressure between the test wheel and the specimen is 0.7MPa ± 0.05MPa at 60°C, and a total load of 78kg is applied. The specimen is repeatedly rolled along the same track on the surface of the specimen. The depth of the rutting formed on the specimen surface is measured and expressed as the rutting dynamic stability.

[0066] Permeability coefficient: Referring to the method in Section 2.3 of Gan Bingqing's master's thesis "Mix Design and Performance Research of Permeable Asphalt Concrete", the permeable asphalt pavement materials prepared in Examples 1-3 and Comparative Examples 1-3 were tested;

[0067] The test results are shown in Table 1:

[0068] Table 1 Performance test results of permeable asphalt pavement materials

[0069]

[0070] It can be seen from the experimental results in Table 1 that the permeable asphalt pavement material of the present invention has good deformation resistance, high temperature deformation resistance and water permeability.

[0071] The technical solutions of the present invention are further described in detail below in conjunction with specific embodiments. It should be understood that the following embodiments are only used to explain the present invention and are not used to limit the present invention.

[0072] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. In other words, equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A permeable asphalt pavement material, characterized in that: The invention comprises the following components by weight: 20-30 parts of cement, 50-60 parts of modified asphalt, 20-30 parts of coarse aggregate, 10-20 parts of fine aggregate, 5-10 parts of reinforcing fiber, and 20-40 parts of water; The modified asphalt preparation method is as follows: trimethylolpropane and 2-hydroxyphenylacetic acid are dissolved in N,N-dimethylformamide, and then a solution of N,N'-dicyclohexylcarbodiimide in N,N-dimethylformamide is added dropwise, and the mixture is reacted at 0-10°C for 3-5 hours. After the reaction is completed, the mixture is centrifuged and the supernatant is collected; water is added to the supernatant, the mixture is stirred, and the organic phase is collected. The organic phase is evaporated under reduced pressure to remove the solvent to obtain a modifier; Heat the asphalt to 100-150°C, add PEG-200, rubber powder, and styrene-butadiene-styrene, stir, and then heat to 160-180°C, continue stirring for 1-2 hours, add modifier and petroleum resin, and stir to obtain modifier-modified asphalt; The reinforcing fiber is obtained by grafting a silane coupling agent onto a plasma-treated polypropylene fiber. The preparation method is as follows: the plasma-treated polypropylene fiber is immersed in a sodium hydroxide aqueous solution, the silane coupling agent is added and stirred for reaction, and the reinforcing fiber is taken out and dried to obtain the reinforcing fiber.

2. The pavement material according to claim 1, characterized in that: The mass ratio of the trimethylolpropane to 2-hydroxyphenylacetic acid is 1:7-12.

3. The pavement material according to claim 1, characterized in that: The coarse aggregate is one of basalt crushed stone and granite crushed stone or a mixture of the two.

4. The pavement material according to claim 1, characterized in that: The fine aggregate is river sand, yellow sand or a mixture of the two.

5. The pavement material according to claim 1, characterized in that: The plasma treatment conditions are: power 60-100W, vacuum degree 25-35Pa, and treatment time 3-5min.

6. The pavement material according to claim 1, characterized in that: The mass ratio of the polypropylene fiber to the silane coupling agent is 10-15:

1.

7. A method for preparing the pavement material according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: heating asphalt to a molten state, adding cement, coarse aggregate, fine aggregate, reinforcing fiber and water and fully stirring to obtain the permeable asphalt pavement material.

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