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The paper studied the effect of fly ash, silicafume and curing environments on the compressive strength of concrete. Portland cement was replaced by fly ash and silicafume at different proportions of up to 20%. Samples were cured in water and in the laboratory conditions. Slump, density, and compressive strengths up to 90 days were investigated. The results show that fly ash increases, but silicafume reduced the workability of fresh concrete. In addition, silicafume decreases the density of hardened concrete. Both curing environments, 20% of Portland cement replaced by fly ash and silicafume reduces the compressive strength as it was up to 93% of the control samples at 90 days, while 5% of silicafume improved the compressive strength. The compressive strength of concrete with or without fly ash and silicafume cured in water are higher than that cured in laboratory condition. The ratio of compressive strength cured in both environments are in the range of 1.2 to 1.7. The biggest variation of compressive strength of concrete in two curing environments is obtained when 20% fly ash was used to replace Portland cement whereas the smallest difference is found when 10% silicafume was used to replace Portland cement.

Ảnh hưởng của tro bay, silicafume và môi trường dưỡng hộ đến cường độ chịu nén của bê tông