Study on the Cracking Process of Cement-Based Materials by AC Impedance Method and Ultrasonic Method

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• 作者：Yue Li (1)
  Chun-e Sui (2) sce2008_tl@163.com
  Qing-jun Ding (3)
• 关键词：Cement ; based materials – ; Bending process – ; AC impedance spectroscopy – ; Ultrasonic
• 刊名：Journal of Nondestructive Evaluation
• 出版年：2012
• 出版时间：September 2012
• 年：2012
• 卷：31
• 期：3
• 页码：284-291
• 全文大小：649.7 KB
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• 作者单位：1. The Key Lab of Urban Security & Disaster Engineering, Beijing University of Technology, Beijing, 100124 China2. The Key Lab of Coast Civil Structure Safety School of Civil Engineering, Tianjin University, Tianjin, 300072 China3. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070 China
• ISSN：1573-4862

文摘

By using AC impedance spectroscopy (ACIS), this paper studied the changes of electrochemical parameters of cement paste mixed with fly ash (FA), ground blast furnace slag (GBFS) and silica fume (SF) during the process of bending. The results showed that: the AC impedance parameter R _s decreased with the increase of stress imposed on the specimens. Under the same condition of W/B and stress, for R _s there were group D with SF > group C with GBFS > group A of cement paste > group B with FA, which indicated that the porosity or cracks within the samples were group B > A > C > D, and with the increase of stress, the change rate of R _s of group D, C and A was less than group B. At the same time, ultrasonic method was used to test the changes of sonic time and first wave amplitude during the bending process, and the results are agree with the changes of ACIS parameters.