In situ time-resolved X-ray diffraction of tobermorite formation in autoclaved aerated concrete: Influence of silica source reactivity and Al addition |
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| Authors: | Kunio Matsui Jun Kikuma Masamichi Tsunashima Tetsuji Ishikawa Shin-ya Matsuno Akihiro Ogawa Masugu Sato |
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| Affiliation: | aConstruction Materials Laboratory, Asahi-KASEI Construction Materials Corporation, 106 Someya, Sakai, Ibaraki 306-0493, Japan;bAnalysis and Simulation Center, Asahi-KASEI Corporation, 2-1 Sameshima, Fuji, Shizuoka 416-8501, Japan;cIndustrial Application Division, SPring-8/JASRI, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan |
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| Abstract: | The hydrothermal formation of tobermorite during the processing of autoclaved aerated concrete was investigated by in situ X-ray diffraction (XRD) analysis. High-energy X-rays from a synchrotron radiation source in combination with a newly developed autoclave cell and a photon-counting pixel array detector were used.To investigate the effects of the silica source, reactive quartz from chert and less-reactive quartz from quartz sand were used as starting materials. The effect of Al addition on tobermorite formation was also studied. In all cases, C-S-H, hydroxylellestadite and katoite were clearly observed as intermediates.Acceleration of tobermorite formation by Al addition was clearly observed. However, Al addition did not affect the dissolution rate of quartz. Two pathways, via C-S-H and katoite, were also observed in the Al-containing system. These results suggest that the structure of initially formed C-S-H is important for the subsequent tobermorite formation reactions. |
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| Keywords: | Calcium silicate hydrate (C-S-H) (B) X-ray diffraction (B) Hydrogarnet (D) Portland Cement (D) Tobermorite (unlisted) |
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