A migrating corrosion inhibitor evaluated in concrete containing various contents of admixed chlorides

W. MORRIS; M. VAZQUEZ

CEMENT AND CONCRETE RESEARCH

PERGAMON-ELSEVIER SCIENCE LTD

Año: 2002 vol. 32 p. 259 - 267

0008-8846

The performance of a surface-applied migrating corrosion inhibitor (MCI) based on an alkylaminoalcohol was evaluated on concretespecimens containing reinforcing steel bar (rebar) segments. Two water/cement ratios (w/c’s), various chloride contents and two exposureconditions were investigated. The inhibiting efficiency was followed over a period of 1000 days by means of parameters such as corrosionpotential, corrosion current and electrical resistance. Results show that when concrete is exposed to the marine environment, the inhibitor isable to reduce the corrosion rate (CR) only when the initial chloride content is below 0.16 wt.% relative to cement content. Efficiencyincreases as the w/c increases. There is no beneficial effect when the initial chloride content is greater than 0.43%. When concrete isimmersed in a saline solution, no beneficial effect associated to the use of the inhibitor could be appreciated, regardless of w/c or initialchloride content in concrete. D 2002 Elsevier Science Ltd. All rights reserved.