期刊
CEMENT & CONCRETE COMPOSITES
卷 79, 期 -, 页码 106-116出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2017.02.004
关键词
Tricalcium silicate; Hydration; Silica nanoparticles; C-S-H; Nanoindentation
资金
- CSIR-Central Building Research Institute, Rorrkee, India
This paper presents the quantification and nanomechanical properties of calcium silicate hydrate (C-S-H), formed at early stage hydration of tricalcium silicate (major cement phase) in presence of silica nanoparticles (SNPs). SNPs showed dominant nucleation effect at 8 h and pozzolanic effect at 24 h and accelerate the hydration rate (similar to 83% at 8 h and similar to 51% at 24 h) due to the formation of additional C-S-H nuclei. Further, Si-29-NMR and FTIR techniques showed the acceleration in polymerization of silicate chain leading to the formation of tobermorite like structure. Formation of polymerized and crystalline C-S-H gel in presence of SNPs increases the percentage of high density C-S-H (similar to 40%) and lowers the low density C-S-H (similar to 52%) at 24 h of hydration, as observed in nanoindentation results. (C) 2017 Elsevier Ltd. All rights reserved.
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