Road base materials prepared by multi-industrial solid wastes in China: A review

The accumulation of industrial solid wastes has led to serious environmental pollution. Resources and large-scale utilization of industrial solid wastes is an effective way to solve the problem of solid waste accumulation in China. This paper reviews the feasibility of using coal-based solid waste, metallurgical slag, tailings, industrial byproduct gypsum and municipal garbage incineration waste as road base materials. The properties of road base materials prepared from industrial solid wastes are similar to those of traditional materials. In addition, the unconfined compressive strength of road base materials prepared from different industrial solid wastes was compared. It was found that the type of industrial solid wastes and the proportion of designed raw materials can be reasonably selected according to the actual road demand and the source of industrial solid wastes. Moreover, the composite synergistic effect has been reported between various industrial solid wastes. This will help to improve the performance of road base materials prepared from multi-industrial solid wastes. Therefore, applying industrial solid wastes to road base materials can accomplish the large-scale utilization of industrial solid wastes and broaden the range of road base material selection. Finally, critical suggestions are given for the preparation of road base materials from industrial solid wastes.