RCPT - rapid chloride ions penetration test
Rapid chloride ion penetration test as per ASTM C 1202 is test of concrete in which 95 mm - 102 mm diameter and 50 mm thick concrete disc is fixed between NaCl and NaOH solutions. Then current is passed through it @60 volt for 6 hours, passed current is measured in couloumb. This is called chloride ion permiablity. Actually it's a permiablity test for concrete. Generally it's limits is 1000 to 1500 coulomb at 28 days. Test is also permitted on 56, 91 days.
