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

Author(s): Ceki Halmen, David Trejo, Kevin J. Folliard, and Lianxiang Du

Publication: Materials Journal

Volume: 103

Issue: 1

Appears on pages(s): 53-59

Keywords: controlled low-strength materials; corrosion; portland cement.

DOI: 10.14359/15127

Date: 1/1/2006

Controlled low-strength materials (CLSMs) are being used as bedding and backfill for pipelines. Earlier research has indicated that pipes completely embedded in CLSM are less susceptible to corrosion damage and that the corrosion activity of pipes embedded in CLSM can be modeled with various parameters. In the field, conditions can occur where the pipe is not completely embedded in the CLSM, forming galvanic corrosion cells. Although research has shown that pipes completely embedded in CLSM are less susceptible to corrosion, further work is needed to investigate the influence of exposing metallic pipes to different bedding or backfill environments. This research investigates the corrosion performance of ductile iron and galvanized pipes exposed to sand, a combination of sand and CLSM, and a combination of clay and CLSM environments. Results indicate that samples embedded in the sand-CLSM and clay-CLSM environments experience higher mass loss than samples embedded entirely in sand.