Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 234, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2019.117273
Keywords
High-volume fly ash; Blended cement; Compressive strength; Precipitated-calcium carbonate; Pozzolanic reaction; Cement hydration; FTIR; Alkali activation; Si-O bond; C-S-H
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Funding
- Directorate General for Research and Development -Ministry of Research, Technology and Higher Education of the Republic of Indonesia [1678.4/PL19/LT/2018]
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Poorer reactivity of fly ash (FA) than Portland cement brings to the problems of low strength and setting time delays of very high-volume fly ash cement paste. This study combines precipitated-calcium carbonate (PCC) substitution and dilute-alkali fly ash treatment for overcoming those drawbacks. The strength was examined at 3-, 7-, 28- and 56-day. Scanning electron microscopy and Fourier-transform infrared spectroscopy were applied for characterisations. PCC substitution improved the strength and shortened the setting time; then additional dilute-alkali fly ash treatment results in better properties. Combination of PCC substitution and dilute-alkali treatment enhances cement hydration and FA pozzolanic reaction simultaneously. (C) 2019 Elsevier Ltd. All rights reserved.
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