A Cornerstone Earth Group, Inc. #Engineer performs in-situ resistivity testing. Many factors can affect the corrosion potential of soil including moisture content, resistivity, permeability, and pH, as well as chloride and sulfate concentration. Typically, soil resistivity, which is a measurement of how easily electrical current flows through a medium (soil and/or water), is the most influential factor. The data collected in the field is used to estimate relative corrosion potential of the in-place soil. The resistivity tests were performed using the Wenner 4-pin method (ASTM G57).
Cornerstone offers a suite of laboratory corrosion tests on soils collected in the field. These tests typically include resistivity, pH, soluble sulfate, and chloride determinations and are used to evaluate the potential impact on underground metallic utility lines and Portland cement concrete foundations.