论文信息 - Mechanical Property Evolution during Autoclaving Process of Aerated Concrete Using Slag: I, Tobermorite Formation and Reaction Behavior of Slag

Mechanical Property Evolution during Autoclaving Process of Aerated Concrete Using Slag: I, Tobermorite Formation and Reaction Behavior of Slag

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.

K. Sasaki | T. Mitsuda | N. Isu | H. Ishida

[1] K. Sasaki,et al. Phase Evolution during Autoclaving Process of Aerated Concrete , 1992 .

[2] H. El-Didamony,et al. Influence of slag substitution on some properties of sand-lime aerated concrete , 1986 .

[3] R. Roy,et al. Al-substituted tobermorite: shows cation exchange , 1982 .

[4] T. Mitsuda,et al. Hydrothermal reaction between C‖S‖H and kaolinite for the formation of tobermorite at 180°C , 1977 .

[5] S. Abo-El-Enein,et al. Morphology and microstructure of autoclaved slag-clinker pastes in presence and absence of silica sand , 1977 .

[6] R. Mikhail,et al. Morphology and microstructure of autoclaved clinker and slag-lime pastes in presence and in absence of silica sand , 1977 .

[7] M. Daimon,et al. Kinetics and Mechanisms of Hydrothermal Reaction of Granulated Blast Furnace Slag , 1975 .

[8] T. Mitsuda. Paragenesis of 11 Å tobermorite and poorly crystalline hydrated magnesium silicate , 1973 .

[9] T. Mitsuda. SYNTHESIS OF TOBERMORITE FROM ZEOLITE , 1970 .