TY - JOUR
T1 - Mechanical property evolution during autoclaving process of aerated concrete using slag
T2 - I, Tobermorite formation and reaction behavior of slag
AU - Isu, Norifumi
AU - Sasaki, Kaori
AU - Ishida, Hideki
AU - Mitsuda, Takeshi
PY - 1994/8
Y1 - 1994/8
N2 - The chemical reactions in the formation of autoclaved aerated concrete (AAC) block were investigated. The samples were prepared using blast furnace slag at 180 °C under saturated steam pressures for various times from 1 to 128 h. Autoclaving for 1 h yielded 1.1-nm tobermorite with higher Al substitution and lower Ca/(Al+Si) ratio than that made without slag, due to the high solubility of the slag during the initial stage of reaction. This suggests that the utilization of slag has an advantage of reducing processing time. On further reaction, the crystallinity of the tobermorite increases and its Ca/(Al+Si) ratio decreases, becoming constant after 64 h. After a long period of autoclaving, thick reaction rims are formed around unreacted slag particles, interrupting the diffusion of Ca from slag to matrix.
AB - The chemical reactions in the formation of autoclaved aerated concrete (AAC) block were investigated. The samples were prepared using blast furnace slag at 180 °C under saturated steam pressures for various times from 1 to 128 h. Autoclaving for 1 h yielded 1.1-nm tobermorite with higher Al substitution and lower Ca/(Al+Si) ratio than that made without slag, due to the high solubility of the slag during the initial stage of reaction. This suggests that the utilization of slag has an advantage of reducing processing time. On further reaction, the crystallinity of the tobermorite increases and its Ca/(Al+Si) ratio decreases, becoming constant after 64 h. After a long period of autoclaving, thick reaction rims are formed around unreacted slag particles, interrupting the diffusion of Ca from slag to matrix.
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M3 - Article
AN - SCOPUS:0028493880
VL - 77
SP - 2088
EP - 2092
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
SN - 0002-7820
IS - 8
ER -