Superpave与马歇尔设计方法对AC-20沥青混合料性能影响试验研究

Comparative Experimental Study on the Effects of Superpave and Marshall Design Methods on the Performance of AC-20Asphalt Mixture

为了对比Superpave和马歇尔方法所设计的沥青混合料在体积参数、高温稳定性、低温抗裂性和水稳定性等方面的差异,以AC-20沥青混合料为研究对象,以高模量橡胶沥青为胶结料,设计满足工程级配范围和避开Superpave限制区的粗、中、细三个级配。结果发现:Superpave设计方法比马歇尔设计方法可减少0.3%左右的沥青用量;Superpave方法设计的沥青混合料毛体积相对密度比马歇尔方法设计的沥青混合料略大;Superpave方法设计的沥青混合料在高温稳定性和低温抗裂性方面优于马歇尔方法设计的沥青混合料,级配越粗,高温稳定性优异性越大、低温抗裂性优异性越小;Superpave方法和马歇尔方法设计的沥青混合料在水稳定性方面差别不大。

In order to compare the differences in volume parameters,high-temperature stability,low-temperature crack-ing resistance,and water stability of asphalt mixtures designed by Superpave and Marshall methods.Using AC-20 asphalt mixture as the research object and high modulus rubber asphalt as the binder,design coarse,medium,and fine grading that meets the engineering grading range and avoids the restricted areas in Super-pave.The results showed that the Superpave design method can reduce asphalt usage by about 0.3%compared to the Marshall design method.The Superpave method is used to design a mixture with a slightly higher gross volume relative density than Marshall&apos's.The asphalt mixture designed by Superpave has better high-temperature stability and low-temperature crack resistance than Marshall&apos's.The coarser the grading,the greater the excellent high-temperature stability,and the smaller the excellent low-temperature crack re-sistance.The asphalt mixture designed by the Superpave method and Marshall method has little difference in water stability.