Yee Yan Lim, Iman Izadgoshasb, Scott Thomas Smith
2019 Figshare  
The use of structural adhesives, such as epoxy, for the strengthening and repair of civil infrastructure is gaining popularity in the engineering community. Of particular concern to the viability of intervention measure is the degradation of strength and durability of the epoxy over time, especially when exposed to aggressive environments. Monitoring the corrosion process of epoxy is thus essential to ensure safety of the host structure. In this paper, the electromechanical impedance (EMI)
more » ... mpedance (EMI) technique that employs a smart piezoelectric transducer is used to monitor the degradation process of commercially available epoxy when exposed to corrosive environments. Standard epoxy coupons with surface bonded piezoelectric transducer are prepared and then immersed in either acidic or saline conditions in the laboratory. Experimental results show that the change in frequency of resonance peaks in the admittance signatures versus the frequency spectrum is a good indicator of the corrosion process. This study proves that the EMI technique is effective in characterising the severity of corrosion inflicted on the epoxy. The capability of the EMI technique in providing autonomous, real-time, remote monitoring with quick response using non-intrusive active sensors could potentially replace its conventional counterparts
doi:10.6084/m9.figshare.7801199.v1 fatcat:ucn2rueo4nhspaqoiq4te333ja