The purpose of this technical committee report is to provide specifiers, designers, and corrosion control personnel information to control the corrosion of conventional reinforcing steel in hydraulic cement concrete using corrosion inhibiting admixtures.
This report describes several types of materials used as corrosion inhibiting admixtures, their selection and evaluation, their proportioning into freshly mixed concrete, and their effects on fresh and hardening/hardened concrete. Corrosion inhibiting admixtures may help delay corrosion initiation and extend the interval of corrosion propagation.
CP coupons have been used since the 1930s by several of the pioneers of the corrosion-control industry, both in North America and in Europe. Over the last two decades, the use of CP coupons has been rediscovered as a practical method to determine the level of polarization of a buried structure and to confirm the voltage drop in a potential measurement. Acceptance of CP coupon technology is slowly occurring. Research sponsored by the pipeline industry has explored the use of CP coupons and has helped validate the use of this technology.
This AMPP standard practice presents the requirements for electrochemical chloride extraction and electrochemical realkalization of reinforcing steel in atmospherically exposed concrete structures.The standard provides the designengineer and contractor with the requirements for control of corrosion of conventional reinforcing steel in Portland cement concrete structures through the application of chloride extraction or realkalization.This standard is intended foruse by owners, engineers, architects, contractors, and all those concerned with rehabilitation of corrosion-damagedreinforced concrete structures.
Reinforced concrete structures are subject to many types of deterioration. Many of these are visible; however, one that is not is the crevice corrosion that occurs internally at the reinforcing bars. To detect, mitigate and delay this type of insidious corrosion, a form of cathodic protection in the form of thermal sprayed coatings will be discussed. To implement this as a corrective action as well as a preventive action is the theme of this paper.