POWER GENERATION TO CYCLIC LOADING IN CEMENT PASTE COMPOSITES WITH DIFFERENT CONDUCTIVES

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  • FUKUYAMA Tomoko
    RITSUMEIKAN UNIVERSITY, College of Science and Engineering, Department of Architecture and Urban Design（1-1-1, Nojihigashi, Kusatsu-shi, Shiga 525-8577, Japan）
  • KIM Yunmi
    RITSUMEIKAN UNIVERSITY, Research Organization of Science and Technology（1-1-1, Nojihigashi, Kusatsu-shi, Shiga 525-8577, Japan）
  • IKUNO Takashi
    TOKYO UNIVERSITY OF SCIENCE, Faculty of Advanced Engineering, Department of Applied Electronics（6-3-1, Niijuku, Katsushika-ku, Tokyo, 125-8585, Japan）

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  • 導電性の異なるセメントペースト複合体における繰返し載荷に対する発電応答

Abstract

<p>Strain measurement of cementitious materials by the piezoelectric effect has been widely investigated；however, the response is less than poled piezoelectric material. Since the piezoelectric effect is caused by charge behavior, there is a possibility to improve the piezoelectric performance by adding highly conductive carbon fiber to the cementitious materials. The goal of this research is to apply cementitious materials themselves as piezoelectric sensors.<br/>In this paper, the influence of carbon fiber on the piezoelectric performance of cement paste and the piezoelectric behavior of cement paste composites with different conductivities are investigated.<br/>In Series 1, the potential fluctuations of cement paste mixed with carbon fiber were measured under cyclic loading and investigated the influence of the carbon fiber volume on the potential fluctuations. From the results, the periodicity of the potential change rate correlates with the loading cycles. Also, the piezoelectric power was affected by the carbon fiber volume and the potential time series trend gradually decreased.<br/>In Series 2, the composites of carbon fiber-incorporated cement paste and carbon fiber-immiscible cement paste were fabricated as to be modelized repaired structures and were measured the piezoelectric potentials. The correlations between strain and potential were observed in the composites；however, the relationships were not linear, and relaxation phenomena could be attributed to carbon fiber and bi-material interface.</p>

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