Journal
JOURNAL OF CLEANER PRODUCTION
Volume 232, Issue -, Pages 1112-1120Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2019.06.062
Keywords
Granulated copper slag; Chemical modification; Pozzolanic activity; Blended cement; Compressive strength; Hydration product
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Funding
- VINNOVA (Swedish Governmental Agency for Innovation Systems)
- Fundamental Research Funds for Central Universities of the Central South University [2016zzts098]
- China Scholarship Council [201606370120]
- Centre for Advanced Mining & Metallurgy (CAMM) at Lulea University of Technology
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GCS, granulated copper slag, is currently utilized in cement and concrete with a low rate, due mainly to its low pozzolanic activity. The present study was thus performed by first mixing the GCS with CaO, and then melting and water-granulating the GCS-CaO mixtures, as to enhance the reactivity of GCS. Blended cements were formulated by replacing 30 wt % of the cement, PC, with the modified GCS. The addition of CaO in GCS increased the release rates of heat from the early-age hydration of the blended cement pastes. The pastes with CSC20, the GCS of the highest CaO content (19.5%), acquired higher compressive strengths than those for the PC and other PC-GCS pastes at both 28 and 90 days of curing. The GCS richer in CaO consumed more calcium hydroxide for the formation of calcium silicate hydrates, with SEM micrographs showing a microstructure of more gel phases and less pores in PC-GCS paste. These results indicate that the modification by addition of CaO is an effective way to achieve a high reactivity for the GCS. It may then be possible to utilize the modified GCS as a high-quality supplementary cementitious material to enhance the sustainability for both copper and cement industries. (C) 2019 Published by Elsevier Ltd.
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