Anti-cracking asphalt mixture and preparation method thereof
By adding cobalt molybdate and silica to the asphalt mixture for synergistic combination, combining inorganic fibers and rubber powder, the existing asphalt mixture is easily cracked and has low strength, and its crack resistance and strength are significantly improved.
Patent Information
- Application Number
- CN202411781334.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-05
- Publication Date
- 2025-02-28
AI Technical Summary
Existing asphalt mixtures have problems such as prone to cracking and low strength, which affects its use effect and application range.
A crack-resistant asphalt mixture is prepared by adding cobalt molybdate and silica to the asphalt mixture for synergistic combination and combining other components such as inorganic fibers and rubber powder.
It significantly improves the crack resistance and strength of the asphalt mixture and expands its application range.
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Abstract
Description
Technical Field
[0001] The invention relates to the technical field of asphalt mixtures, and in particular to an anti-cracking asphalt mixture and a preparation method thereof. Background Art
[0002] Asphalt mixture is an important road construction material, and its application scope includes highways, urban roads, airport runways, etc. The production of asphalt mixture includes multiple links such as selecting suitable raw materials, batching, mixing, discharging and transportation. Different types of asphalt mixtures will be selected according to different functional areas and traffic flows, and the quality of raw materials and the performance of the mixture must be strictly controlled to ensure that the asphalt mixture meets the design requirements and construction standards. Only in this way can high-quality asphalt mixtures be prepared to provide guarantees for the construction and use of roads.
[0003] At present, due to the increasingly higher requirements on road quality in traffic demand, the existing asphalt mixture still has the problems of easy cracking and low strength, which to a certain extent affects the actual use effect of the asphalt mixture and limits the application scope of the asphalt mixture. Therefore, it is necessary to obtain an asphalt mixture that is resistant to cracking and has high strength. Summary of the invention
[0004] The present invention provides an anti-cracking asphalt mixture and a preparation method thereof, which solves the problems of poor anti-cracking property and low strength of the asphalt mixture in the related art.
[0005] The technical solution of the present invention is as follows: The present invention provides an anti-cracking asphalt mixture, comprising the following components in parts by weight: 25-35 parts of asphalt, 68-82 parts of coarse aggregate, 20-30 parts of fine aggregate, 15-25 parts of modifier, 20-30 parts of inorganic fiber, and 4-8 parts of rubber powder; The components of the modifier include cobalt molybdate and silicon dioxide in a mass ratio of 1:9 to 9:1.
[0006] As a further technical solution, the components of the modifier include cobalt molybdate and silicon dioxide in a mass ratio of 2:3-7.
[0007] In the present invention, cobalt molybdate and silicon dioxide are added to the anti-cracking asphalt mixture for synergistic compounding. When the mass ratio of cobalt molybdate to silicon dioxide is 2:3-7, the anti-cracking property and strength of the asphalt mixture are further improved.
[0008] As a further technical solution, the preparation method of the modifier comprises the following steps: mixing cobalt molybdate, cellulose ether solution and silicon dioxide, drying and calcining to obtain the modifier.
[0009] As a further technical solution, the mass ratio of cellulose ether to solvent in the cellulose ether solution is 1:30-50; The cellulose ether includes one or more of hydroxymethyl cellulose, methyl cellulose, and hydroxypropyl cellulose; The mass ratio of the cellulose ether to the silicon dioxide is 1:8-10.
[0010] As a further technical solution, the components of the modifier include cobalt molybdate, silicon dioxide and polyphenylene sulfide in a mass ratio of 2:3:0.2~0.5.
[0011] As a further technical solution, the preparation method of the modifier includes the following steps: mixing cobalt molybdate, cellulose ether solution and silicon dioxide, drying, calcining, mixing with a solution containing polyphenylene sulfide, and drying to obtain the modifier.
[0012] In the present invention, polyphenylene sulfide is further added to the modifier for modification, thereby further improving the crack resistance and strength of the asphalt mixture.
[0013] As a further technical solution, in the polyphenylene sulfide-containing solution, the mass ratio of polyphenylene sulfide to solvent is 0.1:10-12.
[0014] As a further technical solution, the coarse aggregate includes one or more of crushed stone, slag, and gravel; The fine aggregate includes one or two of quartz sand and stone chips; The inorganic fiber includes one or more of basalt fiber, glass fiber and carbon fiber.
[0015] As a further technical solution, the particle size of the coarse aggregate is 5-9 mm; The particle size of the fine aggregate is 1-3 mm; The particle size of the cobalt molybdate is 30-50 nm; The particle size of the silicon dioxide is 10-15 μm; The inorganic fiber has a diameter of 15-20 μm and a length of 3-6 mm.
[0016] The present invention also proposes a method for preparing the anti-cracking asphalt mixture, comprising the following steps: The components of the anti-cracking asphalt mixture are mixed to obtain an asphalt mixture.
[0017] The working principle and beneficial effects of the present invention are: In the present invention, cobalt molybdate and silicon dioxide are added to the anti-cracking asphalt mixture for synergistic compounding, and the asphalt mixture prepared after mixing with the remaining components significantly improves the crack resistance and strength of the asphalt mixture compared with the asphalt mixture without adding cobalt molybdate and silicon dioxide, or adding cobalt molybdate or silicon dioxide alone. DETAILED DESCRIPTION
[0018] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0019] Example 1 The anti-cracking asphalt mixture comprises the following components in parts by weight: 25 parts of 90# asphalt, 68 parts of gravel (particle size of 5 mm), 20 parts of quartz sand (particle size of 1 mm), 15 parts of modifier, 20 parts of basalt fiber (diameter of 15 μm, length of 3 mm), and 4 parts of rubber powder (particle size of 40 mesh); the components of the modifier include cobalt molybdate and silicon dioxide in a mass ratio of 1:9; the particle size of cobalt molybdate is 30 nm, and the particle size of silicon dioxide is 10 μm; The method for preparing the anti-cracking asphalt mixture comprises the following steps: The cobalt molybdate and silicon dioxide are mixed with the remaining components of the anti-cracking asphalt mixture to obtain an asphalt mixture.
[0020] Example 2 The anti-cracking asphalt mixture comprises the following components in parts by weight: 35 parts of 90# asphalt, 82 parts of gravel (particle size 9 mm), 30 parts of quartz sand (particle size 3 mm), 25 parts of modifier, 30 parts of basalt fiber (diameter 20 μm, length 6 mm), and 8 parts of rubber powder (particle size 80 mesh); the components of the modifier include cobalt molybdate and silicon dioxide in a mass ratio of 9:1; the particle size of the cobalt molybdate is 50 nm, and the particle size of the silicon dioxide is 15 μm; The method for preparing the anti-cracking asphalt mixture comprises the following steps: The cobalt molybdate and silicon dioxide are mixed with the remaining components of the anti-cracking asphalt mixture to obtain an asphalt mixture.
[0021] Example 3 The anti-cracking asphalt mixture comprises the following components in parts by weight: 30 parts of 90# asphalt, 70 parts of gravel (particle size 6 mm), 25 parts of quartz sand (particle size 2 mm), 20 parts of modifier, 10 parts of basalt fiber (diameter 15 μm, length 3 mm), 10 parts of glass fiber (diameter 20 μm, length 3 mm), 8 parts of rubber powder (particle size 80 mesh); the components of the modifier include cobalt molybdate and silicon dioxide in a mass ratio of 1:4; the particle size of cobalt molybdate is 30 nm, and the particle size of silicon dioxide is 15 μm; The method for preparing the anti-cracking asphalt mixture comprises the following steps: The cobalt molybdate and silicon dioxide are mixed with the remaining components of the anti-cracking asphalt mixture to obtain an asphalt mixture.
[0022] Example 4 The only difference between this embodiment and embodiment 3 is that the components of the modifier include cobalt molybdate and silicon dioxide in a mass ratio of 1:1.
[0023] Example 5 The only difference between this embodiment and embodiment 3 is that the components of the modifier include cobalt molybdate and silicon dioxide in a mass ratio of 2:7.
[0024] Example 6 The only difference between this embodiment and embodiment 3 is that the components of the modifier include cobalt molybdate and silicon dioxide in a mass ratio of 2:3.
[0025] Example 7 The difference between this embodiment and embodiment 6 is that the preparation method of the modifier includes the following steps: mixing cobalt molybdate, hydroxymethyl cellulose solution, and silicon dioxide, drying, and calcining to obtain the modifier; The mass ratio of hydroxymethyl cellulose to water in the hydroxymethyl cellulose solution is 1:30; the mass ratio of hydroxymethyl cellulose to silicon dioxide is 1:10.
[0026] Example 8 The difference between this embodiment and embodiment 6 is that the preparation method of the modifier includes the following steps: mixing cobalt molybdate, hydroxypropyl cellulose solution, and silicon dioxide, drying, and calcining to obtain the modifier; Wherein, the mass ratio of hydroxypropyl cellulose to water in the hydroxypropyl cellulose solution is 1:50; the mass ratio of hydroxypropyl cellulose to silicon dioxide is 1:8.
[0027] Example 9 The difference between this embodiment and embodiment 8 is that the preparation method of the modifier includes the following steps: mixing cobalt molybdate, hydroxypropyl cellulose solution, and silicon dioxide, drying, calcining, mixing with a solution containing polyphenylene sulfide, and drying to obtain a modifier; Among them, the mass ratio of hydroxypropyl cellulose and water in the hydroxypropyl cellulose solution is 1:50; the mass ratio of hydroxypropyl cellulose and silicon dioxide is 1:8; in the solution containing polyphenylene sulfide, the mass ratio of polyphenylene sulfide and DMF is 0.1:12; the mass ratio of cobalt molybdate, silicon dioxide and polyphenylene sulfide is 2:3:0.5; the model of polyphenylene sulfide is A400MX01.
[0028] Example 10 The difference between this embodiment and embodiment 8 is that the preparation method of the modifier includes the following steps: mixing cobalt molybdate, hydroxypropyl cellulose solution, and silicon dioxide, drying, calcining, mixing with a solution containing polyphenylene sulfide, and drying to obtain a modifier; Among them, the mass ratio of hydroxypropyl cellulose and water in the hydroxypropyl cellulose solution is 1:50; the mass ratio of hydroxypropyl cellulose and silicon dioxide is 1:8; in the solution containing polyphenylene sulfide, the mass ratio of polyphenylene sulfide and DMF is 0.1:10; the mass ratio of cobalt molybdate, silicon dioxide and polyphenylene sulfide is 2:3:0.2; the model of polyphenylene sulfide is A400MX01.
[0029] Comparative Example 1 The difference between this comparative example and Example 3 is that cobalt molybdate is replaced by silicon dioxide.
[0030] Comparative Example 2 The difference between this comparative example and Example 3 is that silicon dioxide is replaced by cobalt molybdate.
[0031] According to the standard JTGE20-2011 "Test Procedures for Asphalt and Asphalt Mixtures for Highway Engineering", the asphalt mixtures prepared in Examples 1 to 10 and Comparative Examples 1 to 2 were subjected to uniaxial compression tests (test pieces with a diameter of 100 mm and a height of 100 mm were prepared) to test the compressive strength and splitting tensile strength (-10°C); The results are shown in Table 1 below.
[0032] Table 1 Asphalt mixture performance test results
[0033] Compared with comparative examples 1 to 2, the compressive strength and splitting tensile strength of the asphalt mixtures prepared in Examples 1 to 10 are higher, indicating that the asphalt mixtures prepared by synergistically compounding cobalt molybdate and silicon dioxide in the asphalt mixture and mixing with the remaining components significantly improve the crack resistance and strength of the asphalt mixtures compared with asphalt mixtures without adding cobalt molybdate and silicon dioxide, or with cobalt molybdate or silicon dioxide alone.
[0034] Compared with Examples 3 to 4, the compressive strength and splitting tensile strength of the asphalt mixtures prepared in Examples 5 to 6 are higher, indicating that the synergistic compounding of cobalt molybdate and silica in the anti-cracking asphalt mixture, when the mass ratio of cobalt molybdate to silica is 2:3 to 7, further improves the crack resistance and strength of the asphalt mixture.
[0035] Compared with Examples 6 to 8, the compressive strength and splitting tensile strength of the concrete prepared in Examples 9 to 10 are higher, indicating that the further addition of polyphenylene sulfide to the modifier for modification further improves the crack resistance and strength of the asphalt mixture.
[0036] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A crack-resistant asphalt mixture, characterized in that: The invention comprises the following components in parts by weight: 25-35 parts of asphalt, 68-82 parts of coarse aggregate, 20-30 parts of fine aggregate, 15-25 parts of modifier, 20-30 parts of inorganic fiber, and 4-8 parts of rubber powder; The components of the modifier include cobalt molybdate and silicon dioxide in a mass ratio of 1:9 to 9:
1.
2. The anti-cracking asphalt mixture according to claim 1, characterized in that: The components of the modifier include cobalt molybdate and silicon dioxide in a mass ratio of 2:3-7.
3. The anti-cracking asphalt mixture according to claim 1, characterized in that: The preparation method of the modifier comprises the following steps: mixing cobalt molybdate, cellulose ether solution and silicon dioxide, drying and calcining to obtain the modifier.
4. The anti-cracking asphalt mixture according to claim 3, characterized in that: The mass ratio of cellulose ether to solvent in the cellulose ether solution is 1:30-50; The cellulose ether includes one or more of hydroxymethyl cellulose, methyl cellulose, and hydroxypropyl cellulose; The mass ratio of the cellulose ether to the silicon dioxide is 1:8-10.
5. The anti-cracking asphalt mixture according to claim 4, characterized in that: The components of the modifier include cobalt molybdate, silicon dioxide and polyphenylene sulfide in a mass ratio of 2:3:0.2-0.
5.
6. The anti-cracking asphalt mixture according to claim 5, characterized in that: The preparation method of the modifier comprises the following steps: mixing cobalt molybdate, cellulose ether solution and silicon dioxide, drying, calcining, mixing with a solution containing polyphenylene sulfide, and drying to obtain the modifier.
7. The anti-cracking asphalt mixture according to claim 6, characterized in that: In the polyphenylene sulfide-containing solution, the mass ratio of polyphenylene sulfide to solvent is 0.1:10-12.
8. The anti-cracking asphalt mixture according to claim 1, characterized in that: The coarse aggregate includes one or more of crushed stone, slag, and gravel; The fine aggregate includes one or two of quartz sand and stone chips; The inorganic fiber includes one or more of basalt fiber, glass fiber and carbon fiber.
9. The anti-cracking asphalt mixture according to claim 1, characterized in that: The particle size of the coarse aggregate is 5-9 mm; The particle size of the fine aggregate is 1-3 mm; The particle size of the rubber powder is 40-80 mesh; The particle size of the cobalt molybdate is 30-50 nm; The particle size of the silicon dioxide is 10-15 μm; The inorganic fiber has a diameter of 15-20 μm and a length of 3-6 mm.
10. The method for preparing a crack-resistant asphalt mixture according to any one of claims 1 to 9, characterized in that: The following steps are involved: The components of the anti-cracking asphalt mixture are mixed to obtain an asphalt mixture.