Journal
CEMENT & CONCRETE COMPOSITES
Volume 103, Issue -, Pages 193-203Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2019.05.001
Keywords
Supersulfated cement; Blast-furnace slag; Compressive strength; Hydration; Ettringite; Blended cement
Funding
- NSERC/Cement Association of Canada Industrial Research Chair in Concrete Durability and Sustainability
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Supersulfated cements (SSC) are normally produced from granulated blast-furnace slags having high-alumina content. However, such slags are not produced in North America. In this study, SSC mixtures were produced using two different slags, one high in alumina content (13%) and the other low in alumina content (7%). The purpose of this study was to investigate the differences in hydration mechanisms of SSC produced with the two types of slag. The low-alumina slag SSC mixtures showed a lower degree of slag hydration and quantities of hydration products formed (C-S-H and ettringite), ultimately resulting in higher porosity and poor mechanical performance of the SSC mixtures compared to high-alumina slag mixtures. A better mechanical performance of SSC mixtures made with low-alumina slag may be achieved by increasing its rate of glass slag dissolution.
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