Journal
CEMENT AND CONCRETE RESEARCH
Volume 42, Issue 10, Pages 1389-1400Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2012.06.009
Keywords
Hydration; Fly ash; Blended Cement; Pozzolan; Filler
Funding
- Schwenk Cement KG
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The effects of two different low calcium fly ashes on the hydration of ordinary Portland cement (OPC) pastes containing 50 wt.% of fly ash were investigated over a hydration time of 550 days. The results were compared with a reference blend of OPC containing 50 wt.% of inert quartz powder allowing the distinction between filler effect and pozzolanic reaction. Until 2 days, no evidence of fly ash reaction was measured and its influence on the hydration is mainly related to the filler effect. From 7 days on, the effects of the pozzolanic reaction were observed by the consumption of portlandite, the change of the pore solution chemistry, the formation of a presumably water-rich inner hydration product and the change of the C-S-H composition towards higher Al/Si ratio compared to the C-S-H of neat OPC. Additional strength due to the pozzolanic reaction developed after 28 days of hydration. (C) 2012 Elsevier Ltd. All rights reserved.
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