<sup>1</sup>H-NMR RELAXOMETRY ANALYSIS OF WATER CONTENT CHANGES IN HARDENED CEMENT PASTES DURING CARBONATION PROCESS

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  • IGAMI Ryusei
    NAGOYA UNIVERSITY, Graduate School of Environmental Study（Furo-cho, Chikusa-ku, Nagoya-shi, Aichi 464-8603, Japan）
  • AILI Abudushalamu
    NAGOYA UNIVERSITY, Graduate School of Environmental Study（Furo-cho, Chikusa-ku, Nagoya-shi, Aichi 464-8603, Japan）
  • IGARASHI Go
    NAGOYA UNIVERSITY, Graduate School of Environmental Study（Furo-cho, Chikusa-ku, Nagoya-shi, Aichi 464-8603, Japan）
  • MARUYAMA Ippei
    NAGOYA UNIVERSITY, Graduate School of Environmental Study（Furo-cho, Chikusa-ku, Nagoya-shi, Aichi 464-8603, Japan） THE UNIVERSITY OF TOKYO, Graduate School of Engineering（7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan） TOHOKU UNIVERSITY, Research Center for Green X-Tech（6-6, Aoba, Aramaki, Aoba-ku, Sendai-shi, Miyagi, 980-8579, Japan）

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Other Title
  • <sup>1</sup>H-NMR Relaxometryを用いたセメント硬化体の炭酸化過程における含水状態変化の分析

Abstract

<p>In this paper, 1H-NMR Relaxometry is applied to carbonation phase and analyzes changes of chemically bound water content, mobile water content, and total water content in hardened cement paste with the progress of carbonation. The results showed that calcium hydroxide and C-S-H were carbonated at 20℃ and 85％RH. From the measurement of transverse relaxation time T2 by CPMG method, it was confirmed that the transverse relaxation time of Interlayer and Gel pore increased with carbonation. There was a positive correlation between carbonation degree of calcium hydroxide calculated by thermogravimetric/differential thermal analysis and decreasing of chemically bound water measured by Solid echo method, confirming that chemically bound water in calcium hydroxide changed to mobile water due to carbonation. Regarding mobile water, the water content of Gel pore increased and that of Interlayer decreased in C-S-H during the initial stage of carbonation.</p>

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