Mechanical property evolution during autoclaving process of aerated concrete using slag: I, Tobermorite formation and reaction behavior of slag

Norifumi Isu, Kaori Sasaki, Hideki Ishida, Takeshi Mitsuda

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)2088-2092
Number of pages5
JournalJournal of the American Ceramic Society
Volume77
Issue number8
Publication statusPublished - 1994 Aug

ASJC Scopus subject areas

  • Ceramics and Composites

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