Temperature Control of Precast Concrete Subjected to Steam Curing

DOI Web Site
  • Sakuraba H.
    （国研）土木研究所 先端材料資源研究センター
  • Koga H.
    （国研）土木研究所 先端材料資源研究センター
  • Inoue K.
    （一社）道路プレキャストコンクリート製品技術協会 技術委員会 指針部

Bibliographic Information

Other Title
  • 蒸気養生を受けるプレキャストコンクリートの温度管理に関する検討

Abstract

<p>Precast concrete is manufactured using steam curing to accelerate strength development and allow early demolding. However, deterioration caused by delayed ettringite formation (DEF) in the case of excessively high concrete temperatures is a concern. In this study, we investigated the actual conditions of steam curing facilities and conducted experiments under conditions reproducing actual production, and we investigated temperature control methods for the suppression of DEF. Based on the results of the experiment, points to be kept in mind regarding the measurement position of the ambient temperature and the specification and position of the steam outlets for controlling steam were determined. Further, it was determined that when a member is thick and thus ought to be considered as mass concrete, the concrete temperature may exceed 70℃, which is the concrete temperature level at which DEF may occur, depending on the production conditions.</p>

Journal

  • Concrete Journal

    Concrete Journal 60 (11), 993-1000, 2022

    Japan Concrete Institute

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