Effects of dosage and modulus of water glass on early hydration of alkali-slag cements |
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Authors: | Darko KrizanBranislav Zivanovic |
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Affiliation: | a Institute for Testing Materials, Bulevar vojvode Misica 43, 11000 Belgrade, FR, Yugoslavia b Material Science Department, Centre for Multidisciplinary Studies, University of Belgrade, Kneza Viseslava 1a, 11000 Belgrade, FR, Yugoslavia |
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Abstract: | This paper examines the early hydration of alkali-slag cements activated with water glass with different n moduli and sodium metasilicate (Na2SiO3·5H2O) in solution at 25 °C. The early hydration of alkali-activated blast furnace slag cements has been studied using isothermal conduction calorimetry. The cumulative heat of hydration increases by increasing the n modulus as well as the dosage of water glass, but is still lower than that of Portland cement. The compressive strength of normal-cured water glass slag cements is higher than Portland cement mortars. Drying shrinkage of alkali-slag cements is considerably higher than that of Portland cement. Consequently, industrial use of alkali-slag cement needs better understanding of the hardening mechanism and requires further research based on presented observations and results. |
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Keywords: | Alkali-activated cement Calorimetry Hydration Compressive strength |
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