Rapid Chloride Permeability Test Equipment (RCPT) is used to evaluate the resistance of a concrete sample to the penetration of chloride ions. Test is performed by placing a 100 mm diameter concrete cylinder into the sample cells that contain 3.0 % salt solution and 0.3 N sodium hydroxide solution. A voltage of 60 V DC is maintained across the ends of the sample throughout the test and the charge that passes through the sample is recorded. Based on the charge, a qualitative rating can be made of concrete's permeability.
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