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Phase Evolution during Autoclaving Process of Aerated Concrete
Author(s) -
Mitsuda Takeshi,
Sasaki Kaori,
Ishida Hideki
Publication year - 1992
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1992.tb07208.x
Subject(s) - tobermorite , quartz , lime , hydrothermal circulation , materials science , chemical engineering , curing (chemistry) , autoclaved aerated concrete , hydrothermal reaction , mineralogy , autoclave , volume (thermodynamics) , aeration , cement , chemistry , composite material , metallurgy , organic chemistry , thermodynamics , engineering , physics
The reactions were investigated that occur when lime, cement, and quartz sand are mixed together and molded, then treated at 180°C under saturated steam pressures to produce autoclaved aerated concrete. The hydrothermal treatment of mixtures gives Ca‐rich C‐S‐H with varying Ca/Si ratios as an initial product, which reacts further with silica dissolved from quartz to form 1.1‐nm tobermorite with increase of curing time. During autoclaving, the composition of C‐S‐H and tobermorite as a binder continues to change until after 8 h, when the Ca/(Al + Si) ratio becomes constant at 0.8. As the reaction proceeds, the number of micropores increases, and the strength also increases due to the binder effect of the tobermorite. However, the total pore volume does not change, remaining constant values.