【摘 要】
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The use of near-neutral salts such as sodium carbonate as activators for blast furnace slag is attracting the attention of academia and industry, as an alte
【机 构】
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Department of Materials Science and Engineering, The University of Sheffield, Sheffield S1 3JD, UK
【出 处】
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The 14th International Congress on the Chemistry of Cement (
论文部分内容阅读
The use of near-neutral salts such as sodium carbonate as activators for blast furnace slag is attracting the attention of academia and industry, as an alternative method to achieve a comparable pH to that identified in fresh Portland cements, while being more cost-effective, user-friendly and environmentally friendly than the sodium hydroxide/silicate activators which are widely used for production of activated slag cements.However,when using a sodium carbonate activator, a prolonged induction period (which can take up to 5 days in some systems) is often observed.One reason for this long acceleration period is the delayed formation of strength-giving phases such as calcium silicate hydrates (C-S-H).This is due to the preferential reaction of the CO32-from the activator with the Ca2+ released by the dissolving slag, which favours the formation of calcite and mixed sodium-calcium carbonates.Therefore, the initial stage of reaction in Na2CO3-activated slag binders is in some way comparable to in-situ carbonation of the paste, although the pH tends to increase as CO32-is exhausted from the pore solution.To modify the hydration kinetics of slags activated by sodium carbonate, and accelerate the strength development of the materials, the CO32-consumption process could be promoted in the early stages of the reaction by introducing species that are more prone than Ca2+ to react with the CO32-supplied by the sodium carbonate activator.
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