SERVICE LIFE OF REINFORCED CONCRETE (RC) SYSTEMS WITH CEMENT-POLYMER-COMPOSITE (CPC) COATED STEEL REBARS

摘要

Cement-Polymer-Composite (CPC) coating is used to coat steel rebars in anticipation of delaying the initiation of corrosion in reinforced concrete (RC) systems. However, CPC coating is sometimes inadequately applied on rusted steel. This paper investigates the effect of such inadequate application of CPC coating on service lives of RC systems. For this, a total number of 30 macrocell specimens with following steel surface conditions were cast with and without CPC coating (a) rusted (b) mechanically cleaned with wire-brush and (c) sand-blasted, and tested for corrosion current, half-cell potential, and chloride threshold. The corrosion initiation time of RC system with inadequate quality construction practices was found to be 40% less than the design life.