Corrosion of Metallic Materials in Controlled Low-Strength Materials-Part 4

Abstract

This paper investigates the corrosion performance of ductile iron and galvanized pipes exposed to three separate environments: sand, a combination of clay and controlled low-strength materials (CLSM), and a combination of sand and CLSM. Part 3 of this research (published in the November 2005 issue of this journal) described the results of the investigation of corrosion performance where ductile iron and galvanized pipes were completely embedded in 13 different CLSM mixtures. In this study, the ductile iron and galvanized steel coupons were partially embedded in both CLSM and soil. There appears to be increased corrosion activity by the metallic materials when they are embedded in the CLSM mixtures or soils. The research also indicates that if a galvanic couple occurs due to a pipe being embedded in both CLSM and soil, the part of pipe in the soil would be the critical anodic section. These results apply where the environments are significantly different, and may not be applicable to other situations.