A kind of low-viscosity rubber powder modified asphalt and preparation method thereof

Abstract

The invention relates to a low-viscosity rubber powder modified asphalt and a preparation method thereof, belonging to the technical field of chemistry. Low-viscosity rubber powder modified asphalt, in parts by weight, includes base asphalt: 100 parts, modified rubber powder: 25-35 parts, crosslinking agent: 0.25-0.5 parts; wherein, the modified rubber powder includes waste Car tire rubber powder: 100 parts, softener: 5‑15 parts, activator: 0.3‑2 parts. The invention reduces the viscosity of the rubber powder modified asphalt, can reduce the difficulty of its production, transportation, mixing and paving, and the paved road surface is easier to compact. The whole process adopts continuous butt joint production, that is, "rubber powder A-rubber powder B-modified asphalt" adopts continuous butt joint, which reduces heat loss and reduces the energy consumption of the whole process.

Description

technical field [0001] The invention relates to a road paving material in the field of highway engineering, in particular to a low-viscosity rubber powder modified asphalt and a preparation method thereof. Background technique [0002] In recent years, the development of domestic road traffic has put forward higher and higher requirements for the performance of asphalt pavement. However, because ordinary asphalt concrete can't solve the contradiction between high-temperature stability and low-temperature crack resistance, many rutting and cracking early failure phenomena appear on asphalt pavement in my country, which seriously affects the efficiency of highway use. At present, it has been widely recognized in the industry to improve the performance of base asphalt by adding polymers, but the high price of styrene-butadiene block copolymer (SBS) results in high cost of modified asphalt materials. Therefore, people have been looking for a A more economical and better perform...

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Problems solved by technology

[0005] Patent CN 103468005A discloses a modified low-viscosity rubber asphalt and its preparation method. Rubber powder, base asphalt and polypropylene wax are blended and modified. Polypropylene wax has a lubricating effect, although the viscosity of rubber asphalt can be reduced after adding , but it will greatly affect the low temperature performance of asphalt, resulting in cracking of asphalt pavement at low temperature

[0006] CN 103396669A discloses a microwave desulfurization and cracking waste tire rubber composite modified asphalt and its preparation method. In the method, the waste tire rubber powder and regenerant are treated with microwaves, and then the treated rubber powder is mixed with asphalt and polyethylene wax For blending modification, although the rubber powder has been treated with microwaves, the rubber powder has not been pretreated to make the surface active, so the catalytic activation effect cannot be achieved after microwave treatment, and the rubber powder is simply dried and heated. Although adding polyethylene wax to prepare modified asphalt can reduce the viscosity of rubber asphalt, it will greatly affect the low temperature performance of asphalt, resulting in cracking of asphalt pavement at low temperature

[0007] CN 104559242A discloses a waste rubber powder modified asphalt composition and a preparation method thereof. In the method, the rubber powder is mixed with potassium oleate, sodium dodecylbenzene sulfonate and sodium hydroxide aqueous solution for 60 minutes, and then Dry in an oven at 60°C for about two hours until the activated rubber powder is obtained, and then the activated rubber powder is mixed with asphalt, aromatic oil, polyethylene, etc. to prepare modified asphalt. The process of activated rubber powder prepared by this method is used. Complexity is difficult to achieve in the production process, and the activation effect of this method is poor, and the amount of rubber powder mixed can only reach 6%-20%

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