Soft X-ray Spectromicroscopic Investigation of Synthetic C-S-H and C3S Hydration Products

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[1] [1,Bae, Sungchul

[2] Taylor, Rae

[3] Hernández-Cruz, Daniel

[4] Yoon, Seyoon

[5] Kilcoyne, David

[6] Monteiro, Paulo J.M

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Monteiro, Paulo J.M (monteiro@ce.berkeley.edu) | 1600年 / Blackwell Publishing Inc., Postfach 10 11 61, 69451 Weinheim, Boschstrabe 12, 69469 Weinheim, Deutschland, 69469, Germany卷 / 98期

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Calcium silicate hydrates (C-S-H); the primary binding phase in concrete; is the most prominent physiochemical factor controlling the mechanical and chemical properties in the production of concrete. This paper reports the local-binding structure and morphological details of C-S-H as determined by high-resolution X-ray spectromicroscopy. Hydrated tricalcium silicate (C3S) was used to determine the properties and role of the outer products (Op) of C3S. C-S-H with different molar ratios of Ca/Si; were synthesized (Syn-CSH) to quantitatively evaluate the effect of silicate polymerization on Ca L and Si K edge of C-S-H. Near edge X-ray absorption fine structure (NEXAFS) spectroscopy of Syn-CSH showed no variation in peak positions and energy separation for CaLIII; II edge for the Ca/Si ratios investigated. Compared to Syn-CSH; C3S; when hydrated for 17 d; had a similar local structure around Ca. Si K edge NEXAFS analysis on Syn-CSH showed a tendency for the peak positions of both the Si K edge and the peak induced by multiple scattering to shift to higher energy levels. The results also indicated that the distance between the two peaks increased with a decrease of the Ca/Si ratio in Syn-CSH. Silicate polymerization influenced the multiple scattering of distant shell atoms more than the binding energy of the core atoms. Op of C3S had a uniform and higher degree of silicate polymerization compared to the core area. The results imply that Op reduces the hydration process of C3S into the core area thereby playing a key role on the properties of concrete upon formation. © 2015 The American Ceramic Society;

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