A review of soil resistivity testing for enhanced corrosion Control: Overcoming limitations through integrated geophysical approaches and alternative methodologies

Soil resistivity testing has emerged as a crucial tool for assessing soil corrosivity and informing corrosion control strategies. This review paper aims to explore the limitations of soil resistivity testing and provide insights into alternative methods for accurate measurements and assessment. The paper reveals the challenges associated with surface electrode placement, depth limitations, soil heterogeneity, and the influence of surrounding structures and vegetation. It also discusses potential interference and error sources in soil resistivity testing. To overcome these limitations, alternative electrode configurations, advanced placement techniques, and integrated geophysical approaches were explored. The paper revealed the importance of addressing electrical interference and noise, electrode contact resistance, and equipment limitations in resistivity testing. Additionally, it compared pH testing, corrosion coupons, corrosion inhibitors, and cathodic protection. While these techniques offer advantages, they also have limitations, and the limitations presented in this correspondence are argued to exist provided the soil resistivity displays using present techniques. © 2024 Elsevier Ltd