A systematic study of cement/PFA chemical stabilisation/solidification process for the treatment of heavy metal waste

The aim of this study is to systematically quantify the physical and chemic al properties of the cement based solidified/stabilised heavy metal waste w ith increasing replacement of cement by PFA. Bulk density and unconfined co mpressive strength are measured as the physical parameters. The equilibrium extraction tests, sequential chemical tests and dynamic leaching tests are reported as chemical characteristics. The results showed PFA,blend, ed cem ent-based waste forms have higher porosity and lower strength than the pure cement-based waste forms at experimental curing time. The lower alkaliniti es of the PFA,blended cement,based waste forms, however, lead to higher lea ch rates of heavy metals when the waste is exposed to an acidic medium.