Abstract
The change of compressive strength and the bonding strength to spheroidal graphite cast iron of the slag cement mortar lining, as well as the change of its morphology before and after spray corrosion test with 10%Na2SO4salt were investigated by means of compressive and tensile tests, and XRD, XRF and SEM respectively. The results show that hydration hardening time of slag cement mortar is longer than sulfate resistance mortar and Portland mortar. The compressive strength and bonding strength to spheroidal graphite cast iron for the slag cement mortar are more or less the same as that of the sulfate resistance mortar, but higher than that of the Portland mortar.The hydration reaction products of active ore powders together with water may act as a barrier to suppress the permeation of SO42-, and also the formation of CaSO4·2H2O and AFt. Due to the formed rod- like gypsum accumulated at the interface of sulfate hydration, thereby which may cause mortar surface cracking when filtration sulfate reaches a certain level.
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