PROPERTIES OF 50-YEAR-OLD ALUMINA CEMENT CONCRETE UNDER DIFFERENT CURING AND EXPOSURE CONDITIONS

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  • SATO Masaki
    NIHON UNIVERSITY, College of Science and Technology（1-8-14, Kanda-Surugadai, Chiyoda-ku, Tokyo 101-8308, Japan）
  • YOSHIDA Yuki
    AGC CERAMICS Co., Ltd., Development Center（5-6-1, Umei, Takasago-shi, Hyogo 676-8655, Japan）
  • SANGO Hiroyuki
    NIHON UNIVERSITY, College of Science and Technology（7-24-1, Narashinodai, Funabashi-shi, Chiba 274-8501, Japan）

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Other Title
  • 養生・暴露条件の異なる材齢50年のアルミナセメントコンクリートの性質

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<p>Alumina cement has problems such as temperature, humidity, and conversion, which have a great influence on long-term aging. This study compares the long-term mechanical properties （compressive strength, static modulus）, void structure, and carbonation （carbonation） of alumina cement concrete at various W/C and curing / exposure conditions. Furthermore, the cement paste portion was separated, and amorphous hydrates depending on the curing / exposure conditions were considered, and differences in hydrates were also considered. As a result, the change of compressive strength with time increased compared to that of 50 years old, except for W/C＝60％ in the soil. Neutralization （carbonation） did not proceed by underwater curing at both W/C＝40％ and 60％. On the other hand, at W/C＝60％, it is considered that moisture hardening has proceeded to the center layer. Aluminate hydrate in cement paste was leached in water, and under other hardening and exposure conditions, C3AH6 and CAH10 decomposed by carbonation reaction, and the amount of amorphous hydrate increased in the surface layer.</p>

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