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51312-01750-Dilute Flowable Backfill for Corrosion Mitigation of Buried Steel Pipe: Experimental Procedure

Picture for Dilute Flowable Backfill for Corrosion Mitigation of Buried Steel Pipe: Experimental Procedure
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Product Number: 51312-01750-SG
ISBN: 01750 2012 CP
Author: Scott Lux
Publication Date: 2012
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Corrosion of buried ferrous-based metallic piping is a significant and ongoing expense on Army and DoD installations for sewer/industrial waste lines potable water distribution lines heat distribution piping and other assorted piping. A widely-used approach to corrosion protection at several Army installations is via material choice and the extensive use of cathodic protection. In many cases a non-metallic piping material will not be sufficient for long term reliable service. In the case of cathodic protection an ongoing maintenance and monitoring program is required. This involves the employment and periodic training for a number of inspectors as well as the ongoing inspections themselves. Plus whenever a problem is detected corrective action is immediately required to prevent the advance of corrosive degradation on buried piping. If instead the local pH at the surface of the pipe were to be manipulated to be extremely high then the corrosion rate could be sharply reduced or even stopped. Such an effect can be achieved through the use of an alkaline cementitious material typically called "flowable backfill." With flowable fills (a.k.a. Controlled Low Strength Materials or CLSM) the high pH values result from hydroxyl ions and alkalis present in the pore solution rather than dissolved salts. The benefit of flowable backfills comes from the formation of a passivated oxide film that is protective to the surface of buried ferrous structures. This project will focus on the use of dilute flowable backfill to entirely encase buried piping. In this way corrosion of buried piping will be significantly decreased in a simple reliable and cost effective manner. A field evaluation at Ft. Hood will operate concurrently with a lab evaluation held at ERDC-CERL to study the corrosion mitigation effects of flowable backfill and soil-cement mixtures.
Corrosion of buried ferrous-based metallic piping is a significant and ongoing expense on Army and DoD installations for sewer/industrial waste lines potable water distribution lines heat distribution piping and other assorted piping. A widely-used approach to corrosion protection at several Army installations is via material choice and the extensive use of cathodic protection. In many cases a non-metallic piping material will not be sufficient for long term reliable service. In the case of cathodic protection an ongoing maintenance and monitoring program is required. This involves the employment and periodic training for a number of inspectors as well as the ongoing inspections themselves. Plus whenever a problem is detected corrective action is immediately required to prevent the advance of corrosive degradation on buried piping. If instead the local pH at the surface of the pipe were to be manipulated to be extremely high then the corrosion rate could be sharply reduced or even stopped. Such an effect can be achieved through the use of an alkaline cementitious material typically called "flowable backfill." With flowable fills (a.k.a. Controlled Low Strength Materials or CLSM) the high pH values result from hydroxyl ions and alkalis present in the pore solution rather than dissolved salts. The benefit of flowable backfills comes from the formation of a passivated oxide film that is protective to the surface of buried ferrous structures. This project will focus on the use of dilute flowable backfill to entirely encase buried piping. In this way corrosion of buried piping will be significantly decreased in a simple reliable and cost effective manner. A field evaluation at Ft. Hood will operate concurrently with a lab evaluation held at ERDC-CERL to study the corrosion mitigation effects of flowable backfill and soil-cement mixtures.
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