Journal
CEMENT AND CONCRETE RESEARCH
Volume 116, Issue -, Pages 159-167Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2018.11.007
Keywords
Chemical effect; Hydration kinetics; Nano-alumina; Portland cement
Funding
- National Natural Science Foundation of China (NSFC) [51578551]
- Department of Science and Technology of Fujian Province [2015 J06012]
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For a full understanding of effects of nano-alumina on early-age hydration, hydration of a Portland cement blended with 5% of nano-alumina (gamma-phase) was studied. Except for the well-known filler effect, a chemical effect of nano-alumina was identified in the study, which is related to its dissolving behavior in pore solution. The dissolution of nano-alumina leads to a high initial ettringite content even in the first 10 min, thus a higher initial heat release. The continuous dissolution of nano-alumina contributes to formation of additional ettringite, which consumes aqueous S species, promotes the depletion of gypsum, thus accelerating reaction of aluminate (C(3)A). The dissolution of nano-alumina may also be influenced by S species in pore solution during the induction period. Afterwards, the slow dissolution of nano-alumina only results in a slightly increased aqueous Al concentration for the further increase would be limited by Al-bearing hydrates such as ettringitc and AFm phases.
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