In situ time-resolved X-ray diffraction of tobermorite formation in autoclaved aerated concrete: Influence of silica source reactivity and Al addition

Journal Article · Sun May 15 00:00:00 EDT 2011 · Cement and Concrete Research

DOI:https://doi.org/10.1016/j.cemconres.2011.01.022· OSTI ID:21504016

Matsui, Kunio ^[1]; Kikuma, Jun; Tsunashima, Masamichi; Ishikawa, Tetsuji; Matsuno, Shin-ya ^[2]; Ogawa, Akihiro ^[1]; Sato, Masugu ^[3]

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1. Construction Materials Laboratory, Asahi-KASEI Construction Materials Corporation, 106 Someya, Sakai, Ibaraki 306-0493 (Japan)
2. Analysis and Simulation Center, Asahi-KASEI Corporation, 2-1 Sameshima, Fuji, Shizuoka 416-8501 (Japan)
3. Industrial Application Division, SPring-8/JASRI, 1-1-1 Kouto, Sayo, Hyogo 679-5198 (Japan)

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.

• OSTI ID: 21504016
• Journal Information: Cement and Concrete Research, Vol. 41, Issue 5; Other Information: DOI: 10.1016/j.cemconres.2011.01.022; PII: S0008-8846(11)00036-6; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0008-8846
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALUMINIUM
CALCIUM SILICATES
CHERT
CONCRETES
DISSOLUTION
HYDRATES
PORTLAND CEMENT
QUARTZ
REACTIVITY
SILICA
SYNCHROTRON RADIATION SOURCES
TIME RESOLUTION
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
BUILDING MATERIALS
CALCIUM COMPOUNDS
CEMENTS
COHERENT SCATTERING
DIFFRACTION
ELEMENTS
MATERIALS
METALS
MINERALS
OXIDE MINERALS
OXYGEN COMPOUNDS
RADIATION SOURCES
RESOLUTION
ROCKS
SCATTERING
SEDIMENTARY ROCKS
SILICATES
SILICON COMPOUNDS
TIMING PROPERTIES