Evaluation of Multiple Corrosion Protection Systems for Reinforced Concrete Bridge Decks, Technical Summary

摘要

The purpose of this study is to evaluate the effectiveness of multiple corrosion protection systems and compare their performance to corrosion protection systems used in current practice. Corrosion Protection Systems included in this study are: (1) Conventional steel and conventional epoxy-coated reinforcement, serving as controls. (2) Corrosion inhibitors added to the concrete in conjunction with conventional steel reinforcement. The corrosion inhibitors tested are calcium nitrite with a set retarder (DCI-S), Rheocrete 222+, and Hycrete. (3) Corrosion inhibitors added to the concrete in conjunction with epoxy-coated reinforcement. Corrosion inhibitors tested are as listed above. In addition, an epoxy-coated reinforcement with a primer containing microencapsulated calcium nitrite under the epoxy coating was tested in concrete with no added inhibitor. (4) Multiple-coated steel reinforcement epoxy-coated reinforcement with a 0.05-mm (2-mil) thick coating consisting of 98% zinc and 2% aluminum underneath the epoxy coating. (5) Epoxy-coated reinforcement with increased adhesion between the reinforcement and epoxy. Three types of bars are tested: bars that received a chromate pretreatment prior to coating and bars with proprietary coatings from DuPont and Valspar. (6) Epoxy-coated reinforcement with increased adhesion in conjunction with concrete with DCI-S inhibitor. (7) Galvanized reinforcement. (8) 2205 pickled stainless steel.