Abstract
The current study reports influence of adding dolomite powder (DP) as partial replacement of ground granulated blast furnace slag (slag) on performance of slag-cement self-compacting mortar (SCM). The SCM with a typical slag-cement binder comprised of equivalent mass ratio of ordinary Portland cement (OPC) to slag was used as the reference mixture. The effect of DP on performance of the modified SCMs was accessed by using various DP to slag ratios while fixing OPC amount at 50% in mass of total powder. Experimental results showed that DP addition substituting slag enhanced workability of the modified SCMs. Increase of DP addition induced the modified slag-cement pastes with slightly decreases in both peak of hydration heat liberation and cumulative hydration heat released during 24 h. With ages of curing earlier than 3 days, DP addition decreased the compressive strengths of the modified SCMs. After 7 days of curing, the SCMs with DP addition up to 30 mass.% replacing slag had the highest compressive strengths. Analysis on particles size distributions of the SCMs showed that the DP addition in range of 30–50 mass.% substituting slag could be the optimum amount for improving microstructure of the hardened mortars.
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