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Morphology and Structure of Aluminum Substituted C-S-H Synthesized by Reaction of Alkali Silicate and Calcium Nitrate Aqueous Solution

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Abstract:

Synthetic C–S–H and C-A-S-H samples with different Ca/Si molar ratios (1.0 and 1.5) were prepared by precipitation from solution. The effects of incorporations of aluminum ion into C-S-H gels on their microstructure were studied by applying Fourier Transform Infrared Spectroscopy (FTIR), BET nitrogen adsorption and scanning electron microscopy (SEM). Results show that in FTIR spectra, peaks nearing 970 cm-1 and 450 cm-1 wave number change obviously with the substitution of Al3+ into C/S1.0 C-S-H. In BET diagram, it also can be found that the substitution of Al3+ into C/S1.0 C-S-H lower the specific surface area. Furthermore, SEM graphs also show that the morphology change in C/S=1.0 C-S-H after the substitution of aluminum ion. However, little difference can be found in FTIR spectra and BET diagrams after Al3+ doped into C/S1.5 C-S-H. So, it can be concluded that the effects of the substitution of aluminum ion on the structure and morphology of C-S-H are affected by Ca/Si molar ratio

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Periodical:

Advanced Materials Research (Volumes 287-290)

Pages:

1193-1196

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.287-290.1193

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Online since:

July 2011

Authors:

Yong Jia He, Lin Nu Lu, Jian Ming Zhang, Shu Guang Hu

Keywords:

Aluminum (Al), Ca/Si Ratio, C-S-H, Microstructure

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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