FUNDAMENTAL STUDY ON THE EVALUATION OF THE MORTAR CURING PROCESS BY IMPEDANCE ANALYSIS

DOI Web Site 4 References
  • SAITO Akira
    NAGAOKA UNIVERSITY OF TECHNOLOGY, The Graduate School of Engineering（1603-1, Kamitomioka-cho, Nagaoka-shi, Niigata, 940-2188, Japan）
  • OKAMOTO Tomoichiro
    NAGAOKA UNIVERSITY OF TECHNOLOGY, The Graduate School of Engineering（1603-1, Kamitomioka-cho, Nagaoka-shi, Niigata, 940-2188, Japan）
  • ERIGUCHI Akira
    TAIHEIYO CEMENT CORPORATION, Central Laboratory, Research & Development Promotion Dept.（2-4-2, Ohsaku, Sakura-shi, Chiba, 285-8655, Japan）
  • ISAKA Yukitoshi
    TAIHEIYO CEMENT CORPORATION, Central Laboratory, Research & Development Promotion Dept.（2-4-2, Ohsaku, Sakura-shi, Chiba, 285-8655, Japan）

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Other Title
  • インピーダンス解析によるモルタル硬化過程の評価に関する基礎的研究

Abstract

<p>The purpose of this study was to gain knowledge about the changes in electrical properties of mortar during the curing process. The type of cement and the mixing-water content were changed, and the impedance changes were measured in the time range of 0h to 96h. The Cole-Cole plots of normal portland cement was the characteristic of RC parallel circuit. For all mortars, the electrical resistivity decreased gradually from after placing until 3-4h and then increased rapidly. For a water-cement ratio of 0.5, the peak values of relative permittivity at low-frequency （＜5MHz） decreased in the order of high-early-strength, normal, and low heat portland cement. On the other hand, on the high-frequency side （≥20MHz）, the order was reversed. These changes were discussed in terms of the hydration reaction and the ionization of the cement components.</p>

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