沥青混合料合成级配的均匀性评价

为研究不同粒径组成的颗粒状混合物和不同的级配组成的沥青混合料的路用性能,本文中以紧密填充理论为基础,假设不同粒径的颗粒逐级紧密填充,采用均匀指数评价合成级配的均匀性,在最佳沥青含量下进行性能试验。结果表明,沥青混合料在MCA=0.4～0.6之间存在较大的稳定度和流值,最小的压实比值和势能指数值,有良好的稳定性。最大公称粒径为16 mm的合成级配、均匀指数应控制在0.55～0.60之间具有较好的路用性能。

Uniformity Evaluation of Resultant Gradation of Asphalt Mixture

In order to research the pavement performance of asphalt mixture made of different granular particles and different gradation,it was assumed that the different diameter particles were contacted tightly on the basis of the tight contact theory.The resultant gradation of asphalt mixture was evaluated by uniform index.Many performance tests under the opti-mum asphalt content conditions were done.The test results showed that there were the bigger stability and the flow value,the minimum compaction ratio and segregation index of potential energy from MCA=0.4 to MCA=0.6,it was a desired stability.The pavement performance would be optimal when the uniform index was controlled from 0.55 to 0.60 and the resultant gradation of the maximum normal particle diameter was 16 mm.