Evaluation of Corrosion-Inhibiting Concrete Admixtures

摘要

This report evaluates the use of corrosion-inhibiting admixtures for211u001econstructability, and workability when used along with epoxy coated rebar. 211u001eDeicing agents contain chloride ions that corrode the steel reinforcement. An 211u001eexpoxy-coated rebar has been used since the 1970's however the epoxy coating 211u001econtrols the problem only to an extent. Corrosion of the steel reinforcements 211u001estill occurs. As a result, the Department is interested in the performance of 211u001ecorrosion-inhibiting concrete admixtures. Two manufacturers, Sika Corporation and 211u001eW.R. Grace Concrete Products, supplied corrosion-inhibiting concrete admixtures 211u001eto be tested for their workability, constructability, placement, and performance. 211u001eAccording to the contractor's personnel, and the Departments inspectors, there 211u001ewere no workability, constructability, or placement problems with the corrosion-211u001einhibiting admixtures. Periodic checks have been made since construction, and the 211u001etwo test bridges appear to be performing well.