FT-IR Study on Early-Age Hydration of Alkali-Activated Slag Cement

Yong Hao Fang; Zheng Long Lu; Zhong Li Wang

doi:10.4028/www.scientific.net/KEM.492.429

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Effects of Internal Standards and Peak Profile Functions on Quantitative XRD Phase Analysis of Cement and its Hydrates
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FT-IR Study on Early-Age Hydration of Alkali-Activated Slag Cement
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FT-IR Study on Early-Age Hydration of Alkali-Activated Slag Cement

Abstract:

The hydration process of alkali-activated slag cement, especially at early-age, was studied by FT-IR, compared with that of Portland cement. The results show that during the hydration of alkali activated slag cement, two processes have taken place, the dissolution of Al³⁺from the slag and then the recombination of Al³⁺ions with the silicate anions. The former associated with the break of the glass network of slag and the later with the re-polymerization of the silicate and aluminosilicate anions. The rate of break of the glass network increases with the dosage of water glass, which completed in 24 h when the dosage of the water glass solution equivalent to Na₂O exceeds 6% of the slag powder. It is confirmed by the IR study that Ca(OH)₂ is absent in the hardened alkali activated slag cement paste.

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Periodical:

Key Engineering Materials (Volume 492)

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429-432

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.492.429

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Online since:

September 2011

Authors:

Yong Hao Fang, Zheng Long Lu, Zhong Li Wang

Keywords:

Alkali Activated Cement, FT-IR, Hydration, Portland Cement

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