Journal
CEMENT & CONCRETE COMPOSITES
Volume 102, Issue -, Pages 94-104Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2019.04.010
Keywords
Hydration; Portland cement; Borate ions; LiOH; Retarding effects
Funding
- National Natural Science Foundation of China [51672199]
- Fundamental Research Funds for the Central Universities [WUT: 2017-YB-008]
- National Key Research and Development Program of China [2016YFB0303501]
- 111 Project [B18038]
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The hydration process of Portland cement in solutions containing high concentration of borate ions is studied. The mechanism of retarding effects induced by borate ions on Portland cement is investigated and a solution for mitigating these effects is proposed by adding LiOH into the cement paste. Formation of a loose covering layer rich in borate around C-S-H nuclei and the consequent prevention of C-S-H growth is found to cause the strong retarding effects of borate ions at early ages. Adding LiOH accelerates the early age hydration of Portland cement with borate, and increases the compressive strength of the hardened paste. The LiOH promotes the dissolution of the covering layer on the C-S-H nuclei, and hence counteracts the retarding effects of borates on hydration of Portland cement.
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