FTIR study of the effect of temperature and nanosilica on the nano structure of C-S-H gel formed by hydrating tricalcium silicate

详细信息    查看全文

• 作者：I.F. S谩ez del Bosque ; S. Mart铆nez-Ram铆rez ; M.T. Blanco-Varela
• 关键词：C&ndash ; S&ndash ; H gel ; Tricalcium silicate ; FTIR ; Temperature ; Nanosilica ; Jennite and tobermorite structures
• 刊名：Construction and Building Materials
• 出版年：15 February, 2014
• 年：2014
• 卷：52
• 期：Complete
• 页码：314-323
• 全文大小：2727 K

文摘

Fourier transform infrared spectroscopy (FTIR) was used to explore the effect of temperature (25掳, 40掳 and 65 掳C) and the presence of amorphous nanosilica (nSA) on the nanostructure of the C-S-H gel generated during tricalcium silicate (C<sub>3sub>S) hydration.

Rising temperatures were shown to modify the nanostructure of C-S-H gel. The bands at around 1076 cm<sup>鈭?sup>, 909 cm<sup>鈭?sup> and 540 cm<sup>鈭?sup> that appeared on the FTIR spectrum for C<sub>3sub>S paste with rising temperatures were attributed to the formation a jennite-like structure. Moreover, irrespective of temperature, as the reaction progressed, the initial tobermorite-like C-S-H gel changed to a jennite-like structure. With the addition of nSA, the band generated at 960-970 cm<sup>鈭?sup> appeared from the first day of hydration, an indication that nanosilica accelerates C<sub>3sub>S hydration. The presence of nSA induced no narrowing of the bands at 1076 cm<sup>鈭?/sup><sup>1sup> or 909 cm<sup>鈭?/sup><sup>1sup> at any curing time, a sign that these gels had a smaller proportion of jennite-like species than the gels in the nSA-free pastes. Finally, compositional date of C-S-H was provides.