Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 155, Issue -, Pages 830-837Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2017.08.072
Keywords
Synergistic action; Ternary system; Fly ash; Metakaolin; Microstructure; Durability
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Funding
- Thailand Research Fund
- Siam Cement (Public) Company
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This paper reports the effects of the interaction between metakaolin and fly ash on the microstructure and property development of concrete. X-ray diffraction analysis revealed unstable hemicarboaluminate and calcium monocarboaluminate compounds in most mixtures during 7-28 day curing periods, the relative amounts depending on the metakaolin to fly ash ratio. The mix with the highest peaks of the monocarboaluminate phase yielded the highest long-term strength. Significant improvements in terms of durability, abrasion resistance, chloride permeability and steel corrosion risk were observed. A proportion of cement:metakaolin:fly ash as 80:10:10 yielded marked improvements on slump, slump loss and long-term strength. Synergistic action in the ternary blend significantly improved the workability of fresh concrete and yielded a more uniform mix, denser microstructure and better performance of the hardened concrete. (C) 2017 Elsevier Ltd. All rights reserved.
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