title: A systematic study of cement/PFA chemical stabilisation/solidification process for the treatment of heavy metal waste.
abstract: The aim of this study is to systematically quantify the physical and chemical properties of the cement based solidified/stabilised heavy metal waste with increasing replacement of cement by PFA. Bulk density and unconfined compressive 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-blended cement-based waste forms have higher porosity and lower strength than the pure cement-based waste forms at experimental curing time. The lower alkalinities of the PFA-blended cement-based waste forms, however, lead to higher leach rates of heavy metals when the waste is exposed to an acidic medium.
authors.affiliation: Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom. cecspoon@polyu.edu.hk
authors.forename: C S
authors.initials: CS
authors.lastname: Poon
authors.forename: K W
authors.initials: KW
authors.lastname: Lio
authors.forename: C I
authors.initials: CI
authors.lastname: Tang
mesh_terms: D004787:Environmental Pollution / Q000517:prevention & control; D006256:Hazardous Waste; D008420:Manufactured Materials; D019216:Metals, Heavy / Q000737:chemistry*; D012995:Solubility
chemical_list: D006256:Hazardous Waste; D019216:Metals, Heavy