Abstract
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.
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Acknowledgements
The authors would like to acknowledge the financial support provided by China 973 project “the basic research of environment-friendly in modern concrete (No. 2009CB23201), Beijing Natural Science Foundation (Granted No. 8100001), and the excellent talent project of Beijing (No. 2009A005015000006).
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Li, Y., Sui, Ce. & Ding, Qj. Study on the Cracking Process of Cement-Based Materials by AC Impedance Method and Ultrasonic Method. J Nondestruct Eval 31, 284–291 (2012). https://doi.org/10.1007/s10921-012-0142-z
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DOI: https://doi.org/10.1007/s10921-012-0142-z