Effect of micro-cracking on the electrical and self-sensing properties of an engineered cementitious composite under tensile straining
| Autor: | Benny Suryanto, Danah Saraireh, Asdam Tambusay |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | IOP Conference Series: Materials Science and Engineering. 930:012054 |
| ISSN: | 1757-899X 1757-8981 |
| DOI: | 10.1088/1757-899x/930/1/012054 |
| Popis: | The piezo-resistive response of a relatively mature engineered cementitious composite (ECC) under tensile straining is investigated and compared with previous studies. In this work, tensile tests were performed on four dog-bone shaped ECC samples and during the loading process, electrical impedance measurements were undertaken over the frequency range 100Hz-1MHz to identify the bulk resistance (hence accurate evaluation of resistivity). At the same time, digital images of the front face of the dog-bone samples were recorded throughout the entire loading process to enable detailed crack width analysis to be taken after testing and to monitor micro-crack formation during testing, using the digital image correlation. It is shown that tensile straining resulted in an overall increase in impedance, but retained a similar overall profile with a weakly developed spur evident at the low-frequency side of the impedance spectrum and a circular arc at the high-frequency side. It is also shown that the fractional change in resistivity increases nonlinearly with strain and is related to the nature of micro-crack formation. Published values for fractional change in resistivity and its relation with strain were found to be in a large scatter and in this study, attention is therefore focused on the crack width distribution during loading. |
| Databáze: | OpenAIRE |
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