Abstract
Tricalcium silicate (C3S), the most crucial component in Portland cement, determines the durability of cementitious materials. This research studied the effect of nano-silica (NS) on the sulfate attack resistance of the C3S hydration system. Results showed that NS retarded the sulfate attack process in the C3S system, by preventing the expansive transformation of calcium hydroxide (CH) to gypsum. Higher aluminum content in FA and GGBS cause more serious deterioration. The C-(A)-S-H gel in the systems with FA and GBBS was more easily decomposed in sulfate attack. C-S-H in the NS-modified samples had higher sulfate attack resistance than that in the SF/GGBS/FA modified ones.
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