CaCl 2 ‐Accelerated Hydration of Tricalcium Silicate: A STXM Study Combined with 29 Si MAS NMR

Li, Qinfei; Ge, Yong; Geng, Guoqing; Bae, Sungchul; Monteiro, Paulo J. M.; Choy, ed., Jin-Ho

doi:10.1155/2015/215371

Title: CaCl ₂ ‐Accelerated Hydration of Tricalcium Silicate: A STXM Study Combined with ²⁹ Si MAS NMR

Journal Article · Thu Jan 01 04:00:00 UTC 2015 · Journal of Nanomaterials

DOI: https://doi.org/10.1155/2015/215371 · OSTI ID:1227339

Li, Qinfei; Ge, Yong; Geng, Guoqing; Bae, Sungchul; Monteiro, Paulo J. M.; Choy, ed., Jin-Ho

The effect of calcium chloride (CaCl ₂ ) on tricalcium silicate (C ₃ S) hydration was investigated by scanning transmission X‐ray microscopy (STXM) with Near Edge X‐ray Absorption Fine Structure (NEXAFS) spectra and ²⁹ Si MAS NMR. STXM is demonstrated to be a powerful tool for studying the chemical composition of a cement‐based hydration system. The Ca L _3,2 ‐edge NEXAFS spectra obtained by examining C ₃ S hydration in the presence of CaCl ₂ showed that this accelerator does not change the coordination of calcium in the calcium silicate hydrate (C‐S‐H), which is the primary hydration product. O K‐edge NEXAFS is also very useful in distinguishing the chemical components in hydrated C ₃ S. Based on the Ca L _3,2 ‐edge spectra and chemical component mapping, we concluded that CaCl ₂ prefers to coexist with unhydrated C ₃ S instead of C‐S‐H. In Si K‐edge NEXAFS analysis, CaCl ₂ increases the degree of silicate polymerization of C‐S‐H in agreement with the ²⁹ Si CP/MAS NMR results, which show that the presence of CaCl ₂ in hydrated C ₃ S considerably accelerates the formation of middle groups ( Q ² ) and branch sites ( Q ³ ) in the silicate chains of C‐S‐H gel at 1‐day hydration.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1227339

Journal Information:: Journal of Nanomaterials, Journal Name: Journal of Nanomaterials Journal Issue: 1 Vol. 2015; ISSN 1687-4110

Publisher:: Hindawi Publishing CorporationCopyright Statement

Country of Publication:: Egypt

Language:: English

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