The Research on the Potential Leachability of Asphalt

The potential leachability of five asphalt binders was studied in the present study. The deionized water was the leaching agent and the content of chemical oxygen demand (COD) in the leachates was used to evaluate the leachability of asphalt binders. It was found that some components could leach from asphalt into water, and the COD in leachates increased with the leaching time. Four influence factors, including temperature, time, NaCl content, as well as pH value, were investigated to obtain the optimal conditions via orthogonal experimental design and single factor test, under which the COD of leachates reached maximum value. GC/MS analysis of the leachates showed that the oxygen compounds were the dominant part and hydrocarbon followed.