It is well known that the durability of prestressed concrete structures is reduced as a result of the corrosion of steel in concrete. This paper presents various evaluation methods for selecting a suitable coating system for steel and concrete to prevent corrosion under static load conditions. For this, a specimen of 7-mm-diameter high-tension steel is taken and experiments have been conducted with 150-mm by 150-mm by 300-mm concrete prisms using cement polymer composite coating (CPCC) and fusion-bonded epoxy coating (FBEC). The performance of these coating systems has been compared with an uncoated controlled specimen in an aggressive environment by keeping them immersed in 3% sodium chloride (NaCl) + 0.04 sodium hydroxide (NaOH) solution and subjecting them to an accelerated corrosion. A potential of 2 V has been applied for pull-out bond strength. Based on the results of experimental studies, the composition of the coating system for the prevention of corrosion has been evaluated.

Subject
Electric current, Steel structures, Accelerated corrosion tests, Corrosion prevention, Bond strength, Steel surfaces, Voltage, Tendons, Stress, Mechanical failure, Steel, Concrete, Coating systems
Keywords:
coating system, concrete failure, corrosion process
NACE International
2005
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