Research on Pavement Performance of Volcanic Ash Mixture as Road Base and Mechanism

Abstract

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. The results of pavement performance and reaction mechanism show that the volcanic ash is a kind of potential base material.