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

• Autorzy: Kikuma J. , Tsunashima M. , Ishikawa T. , Matsuno S. , Ogawa A. , Matsui K.
• Konferencja: 5th International Conference on Autoclaved Aerated Concrete "Securing a sustainable future" to be held at Bydgoszcz to celebrate 60 years of AAC experience in Poland, Bydgoszcz, September 14-17, 2011
• Języki publikacji: PL

Abstrakty

EN

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.

Słowa kluczowe

PL

beton komórkowy; technologia produkcji; piasek kwarcowy; rozkład ziarnowy; tobermoryt; badanie XRD; badanie NMR

EN

autoclaved aerated concrete; manufacturing technology; quartz sand; particle size distribution; tobermorite; XRD examination; NMR measurement

• Wydawca: Fundacja Cement, Wapno, Beton
• Czasopismo: Cement Wapno Beton
• Rocznik: 2011
• Tom: nr spec.
• Strony: 12--15
• Opis fizyczny: Bibliogr. 5 poz., il.

Twórcy

autor

Kikuma J.

autor

Tsunashima M.

autor

Ishikawa T.

autor

Matsuno S.

autor

Ogawa A.

autor

Matsui K.

• Analysis and Simulation Center, Asahi-KASEI Corporation, Japan

Bibliografia

• [1] Alexanderson J., 1979. Relations between structure and mechanical properties of autoclaved aerated concrete. Cem. Concr. Res. 9, 507-514.
• [2] Kikuma J., Tsunashima M., Ishikawa T., Matsuno S., Ogawa A., Matsui K., Sato M., 2009. Hydrothermal formation of tobermorite studied by in situ X-ray diffraction under autoclave condition. J. Synchrotron Radiat. 16, 683-686.
• [3] Kikuma J., Tsunashima M., Ishikawa T., Matsuno S., Ogawa A., Matsui K., Sato M., 2010. In situ time-resolved X-ray diffraction of tobermorite formation process under autoclave condition. J. Am. Ceram. Soc. 93, 2667-2674.
• [4] Kikuma J., Tsunashima M., Ishikawa T, Matsuno S., Ogawa A., Matsui K., Sato M., 2010. Formation process of autoclaved lightweight concrete studied by in situ X-ray diffraction under hydrothermal condition. Bunseki Kagaku 59, 489-498.
• [5] Richardson I.G., 1999. The nature of C-S-H in hardened cements. Cem. Concr. Res. 29, 1131-1147.