Testing soil for corrosiveness

Abstract

This article discusses soil conditions and elements that are common to most types of buried or submerged structures. It provides an overview of the parameters which determine the corrosiveness of a soil. Soil resistivity test data is the best data available for determining soil corrosiveness. Analysis of resistivity data should concentrate on changes in resistivity rather than absolute values of resistivity. Chloride concentrations, pH, and total acidity should be known for soil evaluation for most construction materials. Sulfate concentrations and hydroxyl ion concentrations are of concern in dealing with concrete structures. Redox potential sulfides and moisture values should not be used indiscriminately in soil analysis. An experienced corrosion engineer can identify the need for the tests and should supervise testing to ensure a high degree of accuracy.