Journal
MATERIALS & DESIGN
Volume 53, Issue -, Pages 269-274Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2013.07.018
Keywords
Geopolymer; High calcium fly ash; Portland cement; Additive; Curing condition
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Funding
- Higher Education Research Promotion and National Research University Project of Thailand, Office of the Higher Education Commission, through the Advanced Functional Materials Cluster of Khon Kaen University
- Thailand Research Fund (TRF) [RTA5480004]
- TRF
- Khon Kaen University [PHD/0143/2554]
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This paper investigated the mechanical properties and microstructure of high calcium fly ash geopolymer containing ordinary Portland cement (OPC) as additive with different curing conditions. Fly ash (FA) was replaced with OPC at dosages of 0%, 5%, 10%, and 15% by weight of binders. Setting time and microstructure of geopolymer pastes, and flow, compressive strength, porosity and water absorption of geopolymer mortars were studied. Three curing methods viz., vapour-proof membrane curing, wet curing and temperature curing were used. The results showed that the use of OPC as additive improved the properties of high calcium fly ash geopolymer. The strength increased due to the formation of additional C-S-H and C-A-S-H gel. Curing methods also significantly affected the properties of geopolymers with OPC. Vapour-proof membrane curing and water curing resulted in additional OPC hydration and led to higher compressive strength. The temperature curing resulted in a high early compressive strength development. (C) 2013 Elsevier Ltd. All rights reserved.
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