TY - JOUR
T1 - The electro-mechanical tensile properties of an engineered cementitious composite
AU - Saraireh, Danah
AU - Suryanto, Benny
AU - McCarter, John
AU - Walls, Steven
N1 - Funding Information:
The authors wish to acknowledge the financial support of the UK Engineering and Physical Sciences Research Council (grant EP/N028597/1), Kuraray Japan and Kuraray GmbH for the supply of PVA fibres and BASF UK for the supply of HRWR. DS also acknowledges the financial support provided by Heriot-Watt University. Thanks also go to Dr Asdam Tambusay for assistance in part of the experimental work and DIC analysis.
Publisher Copyright:
© 2021 Published with permission by the ICE under the CC-BY 4.0 license.
PY - 2021/11
Y1 - 2021/11
N2 - The influence of ongoing cement hydration and multiple microcrack formation on the electrical impedance of an engineered cementitious composite (ECC) is presented. Impedance measurements were obtained over the frequency range 20 Hz-1 MHz and displayed in the Nyquist format. In addition, the permittivity and conductivity were de-embedded from the measured impedance and presented in both time and frequency domains to elucidate the nature of conduction and polarisation processes. It was found that, over a curing period of 90 days, the ECC displayed a classic impedance response. Both conductivity and relative permittivity were found to be frequency dependent due to bulk relaxation processes operating within the composite. Tensile straining was shown to result in a detectable change in the impedance response, but retained a similar overall profile. When presented in the frequency domain, a downward displacement in both conductivity and relative permittivity profiles was evident with increasing tensile strain. It is shown that the relative permittivity at the high-frequency end could be exploited as a potentially useful indicator for strain/damage detection. The influence of microcracking on the piezo-resistive response of the composite is discussed based on crack patterns obtained from both visual observations and digital image correlation.
AB - The influence of ongoing cement hydration and multiple microcrack formation on the electrical impedance of an engineered cementitious composite (ECC) is presented. Impedance measurements were obtained over the frequency range 20 Hz-1 MHz and displayed in the Nyquist format. In addition, the permittivity and conductivity were de-embedded from the measured impedance and presented in both time and frequency domains to elucidate the nature of conduction and polarisation processes. It was found that, over a curing period of 90 days, the ECC displayed a classic impedance response. Both conductivity and relative permittivity were found to be frequency dependent due to bulk relaxation processes operating within the composite. Tensile straining was shown to result in a detectable change in the impedance response, but retained a similar overall profile. When presented in the frequency domain, a downward displacement in both conductivity and relative permittivity profiles was evident with increasing tensile strain. It is shown that the relative permittivity at the high-frequency end could be exploited as a potentially useful indicator for strain/damage detection. The influence of microcracking on the piezo-resistive response of the composite is discussed based on crack patterns obtained from both visual observations and digital image correlation.
KW - characterisation techniques
KW - composite materials
KW - electrical properties
UR - http://www.scopus.com/inward/record.url?scp=85119203473&partnerID=8YFLogxK
U2 - 10.1680/jadcr.19.00119
DO - 10.1680/jadcr.19.00119
M3 - Article
SN - 0951-7197
VL - 33
SP - 478
EP - 495
JO - Advances in Cement Research
JF - Advances in Cement Research
IS - 11
ER -