Characterization of LDHs prepared with different activity MgO and resisting Cl− attack of concrete in salt lake brine

Abstract Mg-Al layered double hydroxides (LDHs) were synthesized by roasted bauxite and MgO. The ability of concrete with LDHs synthesized by dead-burned MgO to resist Cl− erosion was investigated in a solution reminiscent of a salt lake. The results indicate that greater MgO activity results in faster LDH formation. With an increase in both the curing temperature and the curing time, the LDH content prepared by dead-burned MgO increased gradually. The formation of LDHs is controlled by the activity of bauxite in the bauxite-MgO-water system. Because CO32− and Cl− both enter the LDH intercalation, the Cl− permeability coefficient of the concrete with LDHs was greatly decreased.