Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures)
Online ISSN : 2185-6567
ISSN-L : 2185-6567
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Paper (In Japanese)
  • Kentaro SUHARA, Yukikazu TSUJI, Chunhe LI, Tatsuya NISHIZAKI, Kazuma I ...
    2021 Volume 77 Issue 2 Pages 25-36
    Published: 2021
    Released: April 20, 2021
    JOURNALS RESTRICTED ACCESS

     Precise practical estimation of the expansive strain distribution in cross-sectional dimension is important for effective use of CPC(Chemically pre-stressed concrete) members, but previous studies have reported only the expansive strain distribution of CPC members having symmetrical arrangement of reinforcing bars and cross-sectional dimensions. In this study, we report the estimation method and the experimental results of the expansive strain distribution of CPC members with non-symmetrical rebar arrangement in T-shaped and L-shaped cross sections. The value of the expansive strain estimated by the proposed cross-sectional analysis from the expansive strain of the JIS specimen is goodly corresponded with the experimental value using the Work-done concept.

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  • Takeshi TORICHIGAI, Kosuke YOKOZEKI, Ichiro YOSHIOKA, Minoru MORIOKA
    2021 Volume 77 Issue 2 Pages 37-54
    Published: 2021
    Released: April 20, 2021
    JOURNALS RESTRICTED ACCESS

     The amount of CO2 absorbed in cementitious materials using blast furnace slag and γ-2CaO·SiO2 partially instead of cement and carbonation curing was evaluated by various analytical methods. As a result, it was shown that inorganic carbon analysis is more suitable than thermal analysis to evaluate the amount of CO2 absorption in concrete. In addition, it was shown that the concrete using blast furnace slag and γ-2CaO·SiO2 can absorb large amount of CO2 during carbonation curing. Furthermore, it was confirmed that porosity and compressive strength of the concrete equal to or higher than those of ordinary concrete can be obtained by improving the reaction of blast furnace slag due to the high temperature during carbonation curing and densifying the pore structure due to carbonation of γ-2CaO·SiO2.

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