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- W858496823 abstract "Abstract This paper aims to study the effect of thermally treatment temperatures on composite cements containing nano-silica (NS) and blast-furnace slag (GBFS). The composite cements are composed of NS from 0, 1 and 4 mass% and GBFS from 0, 25, 50 and 65 mass%. The thermal resistance of composite cement pastes was studied after the specimens subjected to thermal treatment at 200, 400, 650, 850 and 950 °C, with rate of heating 5 °C/min for 2 h soaking time. The compressive strength, apparent density and total porosity of composite cement pastes were determined. Substitution of OPC with 25–50% GBFS in the presence of silica-nano-particles improves the fire resistance of composite cement pastes up to 650 °C. The relative compressive strength of unsuperplasticized mixes containing 25, 50 and 65 mass% GBFS (M25, M50 and M65 mixes) were 101.34–109.76%, 113.67–120.98%, 79.55–96.67%, 37.06–41.47% and 12.35–23.08%, whereas the relative compressive strength of superplasticized M25S, M50S and M65S mixes were 109.71–149.02%, 116.71–153.92%, 104.23–143.13%, 77.35–95.40% and 24.47–38.24% for samples thermally treated at 200, 400, 650, 850 and 950 °C. It can be concluded that superplasticized cement pastes made with 50 mass% in the presence of 4 mass% NS have higher thermal resistance up to 650 °C." @default.
- W858496823 created "2016-06-24" @default.
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- W858496823 date "2015-09-01" @default.
- W858496823 modified "2023-10-01" @default.
- W858496823 title "Microstructure of composite cements containing blast-furnace slag and silica nano-particles subjected to elevated thermally treatment temperature" @default.
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- W858496823 doi "https://doi.org/10.1016/j.conbuildmat.2015.05.042" @default.
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