EVALUATION OF ALTERNATION PORE STRUCTURE DISTRIBUTION IN ORDINARY/LOW HEAT PORTLAND PASTE CEMENT DURING FIRST DRYING AND RE-HUMIDIFYING PROCESSES BY NYTROGEN SORPTION

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  • GOTO So
    NAGOYA UNIVERSITY, Graduate School of Environmental Studies（Furo-cho, Chikusa-ku, Nagoya-shi, Aichi 464-8601, Japan）
  • UMEKI Shota
    NAGOYA UNIVERSITY, Graduate School of Environmental Studies（Furo-cho, Chikusa-ku, Nagoya-shi, Aichi 464-8601, Japan）
  • KURIHARA Ryo
    THE UNIVERSITY OF TOKYO, Graduate School of Engineering（7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan）
  • MARUYAMA Ippei
    NAGOYA UNIVERSITY, Graduate School of Environmental Studies（Furo-cho, Chikusa-ku, Nagoya-shi, Aichi 464-8601, Japan） THE UNIVERSITY OF TOKYO, Graduate School of Engineering（7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan）

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Other Title
  • 窒素吸着による処女乾燥・再吸湿過程におけるOPC・LPCペーストの空隙構造変化の差異

Abstract

<p>In this study, nitrogen sorption using ordinary/low heat Portland cement paste, was conducted to understand the microstructural changes of C-S-H during first drying and re-humidifying processes. As a result, the mineral composition of cement affected the pore structure of C-S-H during the first drying process, but not during the re-humidifying process. The irreversible shrinkage of cement is due to pores of 1-5nm, and different pore structure changes were observed in pores of 5-15 and 15-100nm for ordinary/low heat Portland cement with different shrinkage strain.</p>

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