Effect of delayed addition time of synthesized SSPF condensate on the durability of sulphate resisting cement pastes incorporating micro-silica

The work aimed to evaluate the effect of delayed addition time of SSFP condensate on the physico-mechanical characteristics and durability of 10% micro-silica (MS)-sulphate resisting (SRC) cement pastes immersed in 4% MgCl2 or 4% MgSO4 solutions or at elevated temperatures up to 800 degrees C. The results show that the compressive strength and bulk density increase, whereas, the total porosity decreases with 1.5% SSPF at 10 min delayed addition time (optimum mix) up to 90 days. The compressive strength of thermally treatment cement pastes with 1.5% SSFP increases up to 450 degrees C, then decreases up to 800 degrees C. Presence of 1.5% SSFP with 10 min delayed addition time work together to produce a compact cementing structure, which decreases the accessibility of the penetration of chloride as well as sulphate ion penetration and enhances the durability, hence the total chloride and sulphate contents diminished. (C) 2013 Elsevier Ltd. All rights reserved.