Effect of CG Artificial Weathering on Highway Properties

Abstract

The purpose of this study is to understand the effect of coal gangue(CG) weathering on CG highway properties. Three kinds of CG originating from Wuhai, Xuejiawan and Dongsheng areas in China and a common road aggregate as a comparison were sampled to test their stabilities, consistence, free expansibility and unconfined compressive strength under the artificial physical weathering and chemical weathering conditions as a road construction material in lab respectively. The results showed that the stabilities of Wuhai CG were higher than that in others after the physical weathering and chemical weathering. The highway properties such as consistence, free expansibility and unconfined compressive strength of weathered Xuejiawan CG(X-CG) and Dongsheng CG(D-CG) could not meet the road's demands, while the Wuhai CG(W-CG) and road aggregate were content with the road's requirement.