THE RELATION BETWEEN PHASE COMPOSITION AND COMPRESSIVE STRENGTH OF HARDENED FLY ASH CEMENT PASTE CURED IN TEMPERATURE HISTORY BASED ON HIGH EARLY STRENGTH CEMENT

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  • SAEKI Tatsuhiko
    NIIGATA UNIVERSITY, Department of Civil Engineering（8050, Ikarashi-2, Nishi-ku, Niigata-shi, Niigata 950-2181, Japan）
  • ISHIKAWA Yoshitaka
    ELECTRIC POWER DEVELOPMENT Co. Ltd, Chigasaki Research Institute（1-9-88, Chigasaki, Chigasaki-shi, Kanagawa 253-0041, Japan）
  • SUDA Yuya
    UNIVERSITY OF THE RYUKYUS, Faculty of Engineering, University of the Ryukyus, Civil Engineering Program（1, Senbaru, Nishihara-cho, Okinawa 903-0213, Japan）

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Other Title
  • 早強セメントをベースセメントとし温度履歴を与えたフライアッシュセメント硬化体の相組成と強度発現性状

Abstract

<p>Recently, the demand for precast concrete have been increased with the object for construction, productivity, quality control and the shortening of a construction period. In addition, the study for compressive strength of fly ash concrete under the steam curing has been investigated. However, the effect of various condition such as, temperature history and curing condition（water curing or air curing）after steam curing on concrete performance has not been clarified. Regarding the Fly ash concrete cured in temperature history, the study of compressive strength under long term curing age has not been enough.<br/>From the background, the relation between the phase composition and compressive strength of Fly ash was investigated in this study. In this study, high early strength cement replacement with Fly ash（named FAHC）was focused. To clear the effect of the replacement of Fly ash for compressive strength under the period early age between long term ages, the phase composition of hardened Fly ash cement paste was measured. Furthermore, in order to evaluate the effect of the various binder types, the compressive strength in FAHC paste was evaluated by Gel/Space ratio using phase compositions. It is clarified that the compressive strength in FAHC paste is a value at the same level as Ordinary Portland cement replacement with Fly ash at early age. Furthermore, Oxygen and chloride ion diffusion coefficient decrease by replacement with Fly ash in FAHC.</p>

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