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2 2011

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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.

Influence of addition of AI compound and gypsum on tobermorite formation in autoclaved aerated concrete studied by in situ X-ray diffraction

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

Cement Wapno Beton

2011

nr spec.

3-6

The hydrothermal formation of tobermorite during the processing of autoclaved aerated concrete was investigated by in situ XRD analysis. The XRD measurement is carried out using high-energy X-rays from a synchrotron radiation source. The effects of AI and gypsum addition on tobermorite formation were studied. Acceleration of tobermorite formation by AI and gypsum addition was clearly observed. The tobermorite formation mechanisms were discussed in these systems.