A microstructural investigation of a Na2SO4 activated cement-slag blend
- School of Civil and Environmental Engineering, University of New South Wales, Sydney 2052 (Australia)
- School of Minerals and Energy Resources Engineering, University of New South Wales, Sydney 2033 (Australia)
- Boral Cement NSW, Boral Ltd, Maldon Bridge Road, Maldon, NSW 2571 (Australia)
The reactivity and early strength of cement:slag binders is usefully enhanced by the addition of sodium sulfate though the underlying mechanisms of the relationship between the enhanced hydration reactions and the structural aspects of the strength behavior remain unclear. In this study, microstructural development in the presence of Na{sub 2}SO{sub 4} was investigated utilizing mercury intrusion porosimetry (MIP), NMR relaxometry, and XRD. Increased rates of early strength development and decreased rates of late strength development due to the presence of added Na{sub 2}SO{sub 4} were linked to effects on capillary porosity refinement. While degree of hydration at later age was shown to have been lower in the presence of Na{sub 2}SO{sub 4}, and may have been responsible for the higher capillary porosity, a clear alteration in the pathway of microstructural development had occurred with inhibition to hydration of the slag component due to earlier microstructural development proposed.
- OSTI ID:
- 23206147
- Journal Information:
- Cement and Concrete Research, Journal Name: Cement and Concrete Research Vol. 150; ISSN 0008-8846; ISSN CCNRAI
- Country of Publication:
- United States
- Language:
- English
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