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Use of fine particle quartz sand for AAC production: model study by in situ X-ray diffraction and NMR

Kikuma J., Tsunashima M., Ishikawa T., Matsuno S., Ogawa A., Matsui K.

Cement Wapno Beton

2011

nr spec.

12-15

In order to clarify important factors which govern the tobermorite formation in hydrothermal reaction, the effects of quartz particle size and water content were investigated for simplified model systems by in-situ XRD and Si-NMR. Although the reaction time was largely dependent on the quartz particle size, the average Ca/Si in non-crystalline C-S-H at the time that either tobermorite or semi-crystalline C-S-H start to be formed (TO) was nearly identical for all samples. The importance of molar ratio Ca/Si as well as the silicate chain length in non-crystalline C-S-H was suggested. Tobermorite can be synthesized even in the systems with large w/s and fine quartz. It was suggested that lower calcium and/or silicate ion concentration in the solution phase is important for tobermorite formation.