胶粉改性沥青混合料路用性能研究

Study on Pavement Performance of Rubber Powders-modified Asphalt Mixture

采用车辙试验和冻融劈裂试验,系统研究了胶粉掺量、胶粉目数和双氧水掺量3个不同因素对胶粉改性沥青混合料的路用性能的影响规律。结果表明,随着胶粉掺量和胶粉目数的增加都可以提高胶粉改性沥青混合料的高温稳定性和水稳定性,但超过一定量后,对其路用性能的改善作用很小,甚至会降低,因此最佳胶粉掺量为21%、最佳胶粉目数为250μm;同时双氧水也可以改善胶粉改性沥青混合料的高温稳定性和水稳定性。

The waste rubber powder-modified Asphalt can not only improve the pavement performance of the asphalt pavement, but also can solve the environmental pollution problem caused by waste tires. In the paper, the effects of three different factors such as rubber powder content, rubber powder number, and hydrogen peroxide on the pavement performance of the mixture are systematically investigated through a rutting test and freeze-thaw splitting test. The experimental results indicated that the high-temperature stability and water stability of the rubber powders-modified asphalt mixture can be enhanced by increasing the content and fineness of rubber powders;however the performance of the road is only improved little or even reduced after incorporating the excessive amounts of rubber powders. An optimum content of 21 % and optimum fineness of 250 μm are recommended for the rubber powders used. Moreover, hydrogen peroxide is also able to improve the high-temperature stability and water stability of the rubber powders-modified asphalt mixture.