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Effect of silicate modulus of water glass on the hydration of alkali-activated converter steel slag
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Effect of silicate modulus of water glass on the hydration of alkali-activated converter steel slag
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Journal Article
Effect of silicate modulus of water glass on the hydration of alkali-activated converter steel slag
2019
Overview
Converter steel slag, currently underutilized crystalline metallurgical residue, was investigated for use as a precursor for alkali activation. Water glass solution with various moduli (0.5, 1.0, 1.5 and 2.0) was used at the same Na
2
O dosage of 4% in order to investigate effect of modulus on hydration. Pure cement paste with the same ratio of water to binder was selected as the control sample. Results show that modulus has a significant impact on the hydration and mechanical strength development of alkali-activated steel slag. Similar to pure cement paste, alkali-activated steel slag paste has C–S–H gel and Ca(OH)
2
as its main hydration products. However, alkali-activated steel slag pastes have lower hydration heat and fewer amounts of hydration products. Additional silicate has a retarding effect on the hydration of steel slag. Hydration heat, Ca(OH)
2
contents and non-evaporable water contents reduce with increasing modulus. In addition, high silicate modulus fines the pore structure and improves compressive strength of the hardened paste.
Publisher
Springer International Publishing,Springer,Springer Nature B.V
Subject
