Low-viscosity crumb rubber modified asphalt and preparation method thereof

Abstract

The invention relates to low-viscosity crumb rubber modified asphalt and a preparation method thereof, and belongs to the technical field of chemistry. The low-viscosity crumb rubber modified asphalt is prepared from the following components in parts by weight: 100 parts of matrix asphalt, 25-35 parts of modified crumb rubber and 0.25-0.5 part of a crosslinking agent, wherein the modified crumb rubber comprises 100 parts of waste car crumb rubber, 5-15 parts of softener and 0.3-2 parts of an activating agent. According to the preparation method, the viscosity of crumb rubber modified asphalt can be reduced, the difficulty for producing, delivering, agitating and paving the crumb rubber modified asphalt can be reduced, and the pavement paved by the crumb rubber modified asphalt is easy to compact. Continuous butt joint production is selected in the whole process, namely continuous butt joint is adopted for 'crumb rubber A-crumb rubber B-modified asphalt', little heat is lost, and energy consumption of the whole process is reduced.

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 CN103468005A 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] CN103396669A 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 treated with asphalt and polyethylene wax. Blending modification, although the rubber powder has been treated with microwaves, the surface of the rubber powder has not been pretreated to make it active, so the catalytic activation effect cannot be achieved after microwave treatment, and the rubber powder is simply dried and heated. Adding polyethylene wax when preparing modified asphalt can reduce the viscosity of rubber asphalt, but it will greatly affect the low temperature performance of asphalt, resulting in cracking of asphalt pavement at low temperature

[0007] CN104559242A 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 dodecylbenzenesulfonate, 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 complicated It is difficult to realize in the production process, and the activation effect of this method is poor, and the mixing amount of rubber powder can only reach 6%-20%.

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