Application of fly ash/granulated blast-furnace slag cementing material for immobilization of Pb2+

Abstract

Based on activation and synergistic effect among various materials, a low-cost cementing material. FGC binder, was prepared by using fly ash. granulated blast-furnace slag (BFS). carbide slag and compound activator. The results showed that the immobilization efficiency of FGC binder for Pb2+: is higher than that of OPC cement. The hydration products and mechanism of immobilization were analyzed by using XRD. The major products of FGC binder are C-S-H, C-A-H. ettringite and zeolite-like materials. Under the experimental conditions, the Pb2+ curing efficiency of FGC binder is 1.04 ~ 1.24 times that of ordinary Portland cement.