Novel understanding of calcium silicate hydrate from dilute hydration
KAUST DepartmentImaging and Characterization Core Lab
Physical Sciences and Engineering (PSE) Division
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AbstractThe perspective of calcium silicate hydrate (C-S-H) is still confronting various debates due to its intrinsic complicated structure and properties after decades of studies. In this study, hydration at dilute suspension of w/s equaling to 10 was conducted for tricalcium silicate (C3S) to interpret long-term hydration process and investigate the formation, structure and properties of C-S-H. Based on results from XRD, IR, SEM, NMR and so forth, loose and dense clusters of C-S-H with analogous C/S ratio were obtained along with the corresponding chemical formulae proposed as Ca5Si4O13∙6.2H2O. Crystalline structure inside C-S-H was observed by TEM, which was allocated at the foil-like proportion as well as the edge of wrinkles of the product. The long-term hydration process of C3S in dilute suspension could be sketchily described as migration of calcium hydroxide and in-situ growth of C-S-H with equilibrium silicon in aqueous solution relatively constant and calcium varied.
CitationZhang L, Yamauchi K, Li Z, Zhang X, Ma H, et al. (2017) Novel understanding of calcium silicate hydrate from dilute hydration. Cement and Concrete Research 99: 95–105. Available: http://dx.doi.org/10.1016/j.cemconres.2017.04.016.
SponsorsThis work was financially supported by the National High Technology Research and Development Program of China (2015AA034701), the National Natural Science Foundation of China (NSFC51502112) and the Natural Science Foundation of Shandong Province, China (ZR2014EMP010). The NMR Core Lab in KAUST provided sufficient technical support on NMR experiments and analysis in this research and was highly appreciated.
JournalCement and Concrete Research