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- W604158047 abstract "Portland cement concrete is the most widely used building material, but as CO2 emissions regulation become increasingly stringent, the concrete industry is becoming more and more interested in replacing a greater percentage of ordinary portland cement (OPC) with supplementary cementitious materials (SCMs). In this study, several sustainable binders were developed by replacing 70% of OPC with class F fly ash. Without enhancement, the binder exhibited prohibitively long setting time and inadequate early-age compressive strength. Low dosages of alkalis, including sodium hydroxide (0-1.5M) and sodium silicate hydrate (0-2%), were added to modify the early age hydration kinetics, microstructure, and strength development. The heat of hydration, microstructure, composition, and compressive strength of the modified binders were evaluated. The addition of alkalis significantly increased early- and later-age compressive strength, reduced setting time, and promoted more rapid hydration compared to control mixture. Additions of alkalis resulted in up to 55% increased strength. The increase in compressive strength decreased when the dosage of alkali exceeds an optimum level, especially at later ages. Mixtures with added sodium silicate resulted in a reduction in the peak heat of hydration compared to those with added sodium hydroxide." @default.
- W604158047 created "2016-06-24" @default.
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- W604158047 date "2015-01-01" @default.
- W604158047 modified "2023-09-22" @default.
- W604158047 title "Strength and Setting Time Enhancement in Alkali-Modified High-Volume Fly Ash Binders" @default.
- W604158047 hasPublicationYear "2015" @default.
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