Corrosion of concrete structures in the agricultural environment
Authors: S.C.Negi, A.Idriss, J.C.Jofriet And G.Hayward
Description: Concrete floors in barns with underground manure tanks are exposed to hydrogen sulphide, which is generated from anaerobic fermentation of manure. Six treatments typical of various techniques in concrete construction were tested in the laboratory using impressed voltage tests and electrochemical potential tests. In impressed voltage tests specimens made with 8% silica fume cement replacements performed best and similar Portland cement mortar specimens with a w/c ratio of 0.55 poorest. The electrochemical potential tests determined the minimum concentration of sulphides (threshold level) that initiates corrosion in the reinforcement bars for each of the six treatments.
Identifier: CSAE/SCGR-NABEC 01-928