A kind of low temperature resistant cold mix permeable asphalt and preparation method thereof

Abstract

The present invention discloses a low-temperature resistant cold-mix permeable asphalt and a preparation method thereof, wherein the permeable asphalt comprises the following raw materials by mass: 100 parts of rubber asphalt, 10-16 parts of modified plant ash, 3-5 parts of carbon black, 8-15 parts of coarse aggregate, 3-6 parts of fine aggregate, 0.1-0.5 parts of antioxidant, and 0.5-1.5 parts of phosphate. Compared with ordinary asphalt, the rubber asphalt has better low-temperature flexibility, anti-aging, anti-fatigue, water damage resistance and other properties, and is more suitable for application in pavement materials; the use of coarse aggregate and fine aggregate enables each raw material to have better bonding performance, which can effectively prevent cracking; and the addition of modified plant ash and phosphate ester for mixed use has good low-temperature resistance without cracking at minus 40°C.

Description

Technical Field

[0001] The invention relates to the technical field of permeable asphalt, and in particular to low-temperature resistant cold-mix permeable asphalt and a preparation method thereof. Background Art

[0002] Asphalt is often used for paving roads. As the requirements for road drainage become higher and higher, permeable pavements have emerged. Permeable pavements are usually paved with permeable asphalt. Permeable asphalt is an asphalt mixture with a large porosity. By adjusting the ratio of coarse aggregate to fine aggregate, there are more gaps between the coarse aggregates, so that the permeable asphalt has a large porosity to achieve water permeability. On the other hand, low-temperature cracks generated by asphalt pavements during their service life are a common problem at present, especially in cold northern regions. Due to the presence of cracks, the performance of the pavement is reduced. Studies have shown that the low-temperature performance of asphalt contributes 80% to the low-temperature cracking of the pavement. Therefore, to reduce the low-temperature cracking of asphalt pavements, the low-temperature performance of asphalt must first be improved. In addition, since permeable asphalt has more pores, once its structural strength decreases, it is more easily destroyed by external forces, which affects the use of the pavement. Summary of the invention

[0003] In view of this, in order to solve the above problems, the present invention provides a low-temperature resistant cold-mix permeable asphalt and a preparation method thereof, wherein the asphalt has the advantages of good antifreeze performance and good permeability.

[0004] Specifically, the following technical solutions are included:

[0005] On the one hand, a low-temperature resistant cold-mix permeable asphalt is provided, wherein the permeable asphalt comprises the following raw materials in parts by mass: 100 parts of rubber asphalt, 10-16 parts of modified wood ash, 3-5 parts of carbon black, 8-15 parts of coarse aggregate, 3-6 parts of fine aggregate, 0.1-0.5 parts of antioxidant, and 0.5-1.5 parts of phosphate ester.

[0006] In some possible implementations, the method for preparing rubber asphalt includes the following steps: heating 90# road petroleum asphalt to 170°C, adding rubber powder thereto at an amount of 15% by weight of the asphalt, adding thiamethoxam thereto at an amount of 0.5% by weight of the asphalt, and stirring for 1-2 hours.

[0007] In some possible implementations, the particle size of the coarse aggregate is greater than 3 mm, and the particle size of the fine aggregate is less than or equal to 1.5 mm.

[0008] In some possible implementations, the antioxidant is selected from antioxidant 1010; and the phosphate ester is monododecyl phosphate.

[0009] In some possible implementations, the modified wood ash is prepared as follows: 150 parts of rice straw are burned into wood ash in a combustion furnace by weight, ground into powder and passed through a 200-mesh sieve to obtain wood ash powder, then the wood ash powder and 60 parts of water are mixed to obtain a suspension, and the suspension is soaked at a stirring speed of 1200 r / min for 40 minutes, and then the pH value of the suspension is adjusted to neutral with a sulfuric acid solution with a mass fraction of 15%, and the residue is filtered out with a 250-mesh filter, and then the residue is washed with distilled water and dried in a drying oven at 60°C to obtain neutral wood ash, and finally the neutral wood ash is placed in an activation furnace and activated at 1200°C for 30 minutes to obtain modified wood ash.

[0010] On the other hand, the present invention also provides a method for preparing low-temperature resistant cold mix permeable asphalt, comprising the following steps:

[0011] The method comprises the following steps: heating the rubber asphalt to 150°C according to the formula, adding modified wood ash and carbon black for high-speed shearing, then adding antioxidant and phosphate for medium-speed shearing, then controlling the temperature at 150°C and adding coarse aggregate and fine aggregate for low-speed shearing to obtain the permeable asphalt.

[0012] In some possible embodiments, the high-speed shearing is shearing at a shear speed of 6000 r / min for 35 min; the medium-speed shearing is shearing at a shear speed of 3000 r / min for 35 min; and the low-speed shearing is shearing at a shear speed of 400 r / min for 1.5 h.

[0013] The beneficial effects of the technical solution provided by the embodiment of the present invention include at least:

[0014] (1) The low-temperature resistant cold-mix permeable asphalt of the present invention uses rubber asphalt, which has better low-temperature flexibility, aging resistance, fatigue resistance, water damage resistance and other properties than ordinary asphalt, and is more suitable for application in pavement materials; the raw materials have better bonding properties, can effectively prevent cracking and have good low-temperature resistance at minus 40°C without cracking. DETAILED DESCRIPTION

[0015] In order to make the technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below.

[0016] Embodiment 1:

[0017] Provided is a low-temperature resistant cold-mix permeable asphalt I, wherein the permeable asphalt comprises the following raw materials in parts by mass: 100 parts of rubber asphalt, 10 parts of modified plant ash, 3 parts of carbon black, 8 parts of coarse aggregate, 6 parts of fine aggregate, 0.1 parts of antioxidant 1010, and 0.5 parts of monododecyl phosphate;

[0018] Wherein, the particle size of the coarse aggregate is greater than 3 mm, and the particle size of the fine aggregate is less than or equal to 1.5 mm.

[0019] Embodiment 2:

[0020] Provided is a low-temperature resistant cold-mix permeable asphalt II, wherein the permeable asphalt comprises the following raw materials in parts by mass: 100 parts of rubber asphalt, 16 parts of modified plant ash, 5 parts of carbon black, 15 parts of coarse aggregate, 3 parts of fine aggregate, 0.5 parts of antioxidant 1010, and 1.5 parts of monododecyl phosphate.

[0021] Wherein, the particle size of the coarse aggregate is greater than 3 mm, and the particle size of the fine aggregate is less than or equal to 1.5 mm.

[0022] Embodiment 3:

[0023] Provided is a low-temperature resistant cold-mix permeable asphalt III, wherein the permeable asphalt comprises the following raw materials in parts by mass: 100 parts of rubber asphalt, 13 parts of modified plant ash, 4 parts of carbon black, 10 parts of coarse aggregate, 5 parts of fine aggregate, 0.3 parts of antioxidant 1010, and 1 part of monododecyl phosphate.

[0024] Wherein, the particle size of the coarse aggregate is greater than 3 mm, and the particle size of the fine aggregate is less than or equal to 1.5 mm.

[0025] Test Example 1

[0026] The physical properties of the low-temperature resistant cold-mix permeable asphalt prepared in Examples 1-3 were tested, and the following test results were obtained. The specific results are shown in Table 1.

[0027] The testing methods are as follows: 1. Viscosity: GB / T2794-2013; Tensile strength: GB / T528-2009; Elongation at break: GB / T528-2009.

[0028] Table 1: Comparative test data of physical properties of cold mix permeable asphalt;

[0029]

[0030] It can be known from the above test data that the cold-mix permeable asphalt of the present invention has good tensile strength.

[0031] Test Example 2

[0032] The low-temperature resistant cold-mix permeable asphalt prepared in Examples 1-3 was subjected to a low-temperature test. The experimental conditions were as follows: a 10*10*10cm cold-mix permeable asphalt test block was dried at 100°C for 24 hours at 10-20°C, and then the mass M0 was tested. The block was immersed in pure water for 24 hours, and after the surface water was wiped off, the block was placed in a laboratory at -40°C for storage for 7 days. The block was taken out and immersed in 25°C water for 24 hours. The block was dried at 100°C for 24 hours and then the mass M1 was tested again. The mass loss of the two tests is as follows: mass loss = (M0-M1) / M0*100%.

[0033] Table 2: Cold mix permeable asphalt low temperature test results;

[0034] Example 1 Example 2 Example 3 Mass loss% 0.24 0.22 0.27

[0035] From the above test data, it can be seen that the cold-mix permeable asphalt of the present invention uses specific raw materials in a reasonable ratio to significantly improve the low-temperature resistance of asphalt.

[0036] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A low temperature resistant cold mix permeable asphalt, characterized in that: The permeable asphalt comprises the following raw materials in parts by mass: 100 parts of rubber asphalt, 10-16 parts of modified plant ash, 3-5 parts of carbon black, 8-15 parts of coarse aggregate, 3-6 parts of fine aggregate, 0.1-0.5 parts of antioxidant, and 0.5-1.5 parts of phosphate ester.

2. The low-temperature resistant cold-mix permeable asphalt according to claim 1 is characterized in that: The preparation method of rubber asphalt comprises the following steps: heating 90# road petroleum asphalt to 170°C, adding rubber powder in an amount of 15% by weight of the asphalt, adding thiamethoxam in an amount of 0.5% by weight of the asphalt, and stirring for 1-2 hours.

3. The low temperature resistant cold mix permeable asphalt according to claim 2, characterized in that: The particle size of the coarse aggregate is greater than 3 mm, and the particle size of the fine aggregate is less than or equal to 1.5 mm.

4. The low temperature resistant cold mix permeable asphalt according to claim 1, characterized in that: The antioxidant is selected from antioxidant 1010; and the phosphate ester is monododecyl phosphate.

5. The low temperature resistant cold mix permeable asphalt according to claim 4, characterized in that: The modified plant ash is prepared as follows: 150 parts of rice straw are burned into plant ash in a combustion furnace by weight, ground into powder and passed through a 200-mesh sieve to obtain plant ash powder, then the plant ash powder and 60 parts of water are mixed to obtain a suspension, and the suspension is soaked for 40 minutes under stirring at a stirring speed of 1200 r / min, and then the pH value of the suspension is adjusted to neutral with a sulfuric acid solution with a mass fraction of 15%, and the filter residue is filtered out with a 250-mesh filter, and then the filter residue is washed clean with distilled water and dried in a drying oven at 60°C to obtain neutral plant ash, and finally the neutral plant ash is placed in an activation furnace and activated at 1200°C for 30 minutes to obtain modified plant ash.

6. A method for preparing a low-temperature resistant cold mix permeable asphalt according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: heating the rubber asphalt to 150°C according to the formula, adding modified wood ash and carbon black for high-speed shearing, then adding antioxidant and phosphate for medium-speed shearing, then controlling the temperature at 150°C and adding coarse aggregate and fine aggregate for low-speed shearing to obtain the permeable asphalt.

7. A method for preparing low-temperature resistant cold mix permeable asphalt according to any one of claim 6, characterized in that: The high-speed shearing is shearing at a shearing speed of 6000 r / min for 35 min; the medium-speed shearing is shearing at a shearing speed of 3000 r / min for 35 min; and the low-speed shearing is shearing at a shearing speed of 400 r / min for 1.5 h.

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