Title: Corrosion of Metallic Pipe in Controlled Low-Strength Materials—Parts 1 and 2
Author(s): David Trejo, Ceki Halmen, Kevin J. Folliard, and Lianxiang Du
Publication: Materials Journal
Appears on pages(s): 192-201
Keywords: controlled low-strength material; corrosion; coupler
When controlled low-strength materials (CLSM) are proposed for use as a bedding or backfill material, engineers are often forced to use predictive corrosion performance tools applicable for pipes embedded in soils. These tools may not accurately represent the corrosion performance of pipe embedded in CLSM. This research program investigated the corrosion performance of ductile iron pipe in sand (Part 1), in 30 different CLSM mixtures (Part 1), and in a combination of sand and CLSM (Part 2). Results show that for nearly all cases, the corrosion (measured by mass loss) of ductile iron coupons completely embedded in CLSM was less than the corrosion of pipe coupons embedded in sand backfill material. Part 2 of the study indicates that embedding ductile iron pipe in different environments (in this case CLSM and sand), the corrosion activity of the samples increases.