Sensing Mechanism of Self-Monitoring CNT Cementitious Composite

    Volume 42, Issue 1 (January 2014)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Published Online: 15 October 2013

    Page Count: 5


    Sun, Shengwei
    School of Civil Engineering, Harbin Institute of Technology, Harbin,

    Yu, Xun
    Dept. of Mechanical & Energy Engineering, Univ. of North Texas, Denton, TX

    Han, Baoguo
    School of Civil Engineering, Dalian University of Technology, Dalian,

    (Received 16 October 2012; accepted 21 May 2013)

    Abstract

    Owing to its outstanding sensing properties, mechanical properties, and durability, self-monitoring carbon nanotube (CNT) cementitious composite can serve as an intrinsic smart sensor for structural health monitoring and traffic detection. However, it is not clear at present what the origin of the sensing property of the self-monitoring CNT cementitious composite is. This paper discusses the nature of the sensing property of the composite measured with dc and ac circuits based on a commonly used conductive model of CNT cementitious composite and reveals the origin of the sensing property of the composite through experiments. Experimental results indicate that the sensing property of the composite mainly results from the change in contact resistance between adjacent CNTs under external force or deformation.


    Paper ID: JTE20120302

    DOI: 10.1520/JTE20120302

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    Author
    Title Sensing Mechanism of Self-Monitoring CNT Cementitious Composite
    Symposium , 0000-00-00
    Committee C17