Novel Understanding of Calcium Silicate Hydrate from Dilute Hydration


The 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.


Civil, Architectural and Environmental Engineering


This work was financially 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)

Keywords and Phrases

Additives; Calcium; Chemical analysis; Hydrates; Hydration; Silicate minerals; Silicates; Solutions; Structure (composition); Suspensions (fluids); Calcium Silicate hydrate; Chemical formulae; Complicated structures; Crystalline structure; Crystallinities; Dilute suspensions; Structure and properties; Tricalcium silicate; Calcium silicate; C-S-H; C3S hydration; Composition; Crystallinity; Structure

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Article - Journal

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Publication Date

01 Sep 2017