拉萨地区破碎花岗岩、卵漂石路用性能研究

Study on road performance of broken granite and boulder in Lhasa area

选用拉萨地区常见的破碎花岗岩、卵漂石为集料,将其作为沥青混合料骨料,并用密集型沥青混合料AC-25C作为试验样本。主要针对集料本身密度指标、磨耗值、压碎值以及沥青混合料的水稳定性、低温抗裂性、高温稳定性进行试验,验证各种集料及沥青混合料的性能指标是否满足路面相关规范的要求,在满足规范的同时将其性能和石灰岩作进一步的对比分析,为工程项目提供借鉴。将“就地取材”的理念付诸实践,在保证路用性能要求的同时还能节省投资。

In this paper,crushed granite and boulder commonly seen in Lhasa area are selected as aggregates,which are used as asphalt mixture aggregates,and dense asphalt mixture AC-25C is used as test samples.The tests are mainly conducted on the density index,wear value,crushing value of aggregates,and the water stability,low temperature crack resistance,and high temperature stability of asphalt mixture to verify whether the performance indexes of various aggregates and asphalt mixtures meet the requirements of relevant pavement speci?cations.While meeting the speci?cations,the performance of aggregates and asphalt mixtures is further compared with limestone,providing reference for engineering projects.The concept of"local materials"is put into practice,which can not only ensure the road performance requirements,but also save investment.