Inhibiting Effect of Mineral Powder on Sulfate Attack of Cement Mortar
ASTM C1012 and GB2420 method were employed to evaluate the inhibiting effect of different mineral admixtures on sulfate attack of cement mortar, and the mass loss of mortar specimens after drying-wetting cycles was measured for comparison. It is shown that all the mineral admixtures, including ground blast furnace slag (SL), fly ash (FA), natural zeolite (NZ) and metakaolin (MK) were effective in decreasing the 15-week expansion and increasing the corrosion resistance coefficient of the specimens immersed in Na2SO4 solution. The wetting and drying test however, showed inconsistent result, as both physical and chemical attack may soon occur due to quick accumulation of sulfate by capillary absorption instead of diffusion mechanism.
Nai-Qian Feng and Gai-Fei Peng
Q. L. Niu and N. Q. Feng, "Inhibiting Effect of Mineral Powder on Sulfate Attack of Cement Mortar", Key Engineering Materials, Vols. 302-303, pp. 73-78, 2006