火山灰路面基层路用性能研究及机理分析

为解决火山灰分布地区道路工程中传统路面基层原材料的短缺问题,依据火山灰材料的颗粒组成及化学成分,将其用作路面基层的集料、结合料。对不同配合比的火山灰路面基层混合料进行不同龄期的强度、抗收缩性能、抗冻性能及抗疲劳性能试验,通过和二灰碎石及水泥稳定砂砾基层材料路用性能的比较来确定火山灰路面基层的控制参数。同时对不同龄期的火山灰路面基层混合料进行XRD测试,结合测试结果分析火山灰稳定基层的反应机理。路用性能试验和反应机理分析结果表明,火山灰路面基层是一种有潜力的基层材料,火山灰混合料集料的颗粒组成范围可用于指导火山灰材料在路面基层中的应用。

Research on Pavement Performance of Volcanic Ash Road Base and Its Mechanism

In order to solve the lack of raw materials used as traditional road base in the area with abundant volcanic ash,the volcanic ash can be used as road base aggregate and binder considering the granule constitution and chemical components.The tests including strength,contraction,shrinkage,anti-freezing and fatigue resistance were carried out for volcanic ash base mixture with different proportions and different ages.The control parameters were determined by comparing with pavement performance of lime fly-ash macadam and cement stabilized grit.At the same time X-ray diffractions of volcanic ash base with different ages were also conducted,and the reaction mechanism was analyzed according to test results.Results of pavement performance and reaction mechanism show that the volcanic ash is a kind of potential base material.The granule composition scope of volcanic ash aggregate obtained in the research can provide guidance for the application of volcanic ash in road base.