Journal
CEMENT & CONCRETE COMPOSITES
Volume 73, Issue -, Pages 281-288Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2016.07.019
Keywords
Hybrid cements; Curing temperature; NMR
Funding
- Spanish Ministry of the Economy and Competitiveness [BIA2013-43293-R, RTC-2014-2351-5, MAT2012-38541-C02-02]
- Comunidad de Madrid [S2013/MIT-2862-MULTIMAT CHALLENGE]
- China Scholarship Council
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This study aimed to determine the physical-mechanical, mineralogical and microstructural properties of a pre-industrially manufactured hybrid cement (HYC) containing 5% alkaline activator and less than 30% clinker. The effect of the initial curing temperature (25 +/- 1 or 85 degrees C for 20 h) on hydration kinetics and the development of compressive strength were also explored. The hydration products formed were characterised using XRD, SEM/EDX and Al-27 and Si-29 MAS-NMR The findings showed that pre-industrial hybrid cement sets when hydrated with water and hardens to a 28-day mechanical strength of 35 MPa. The main reaction product formed was a mix of cementitious gels: C-(A)-S-H and C-A-S-H. Curing at 85 degrees C for 20 h, shows a behaviour similar to OPC, inhibited ettringite formation and generated more polymerised gels, enhancing 3-day but not 28- or 90-day mechanical strength. (C) 2016 Elsevier Ltd. All rights reserved.
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