Abstract
Rice hush ash (RHA) and ordinary Portland cement (OPC) were used to stabilize a lead-contaminated soil. The effects of RHA content on the permeability, diffusion and sorption of lead ions for stabilized soil are presented. Test results indicate that replacement of OPC with RHA can increase significantly the short-term permeability of stabilized soil, but its effect on the long-term permeability is negligible. Furthermore, the retardation factor of lead ions increases substantially with increasing RHA content. As a result, the apparent diffusion coefficient decreases significantly by replacing OPC with RHA. Thus, a binder system with RHA could be a better option to reduce the long-term leachability of lead than the one using OPC alone.
