Rapid Chloride Permeability Test :: RCPT :: Concrete technology.

Rapid Chloride permeability test (RCPT) determines the resistance to penetration of chloride ions. The rapid chloride permeability test RCPT-ASTM C 1202 is commonly used to evaluate the resistance of concrete to chloride ions ingress owing to its simplicity and rapidity.
RCPT is an electrical indication of concrete’s ability to resist chloride ion penetration. It enables the prediction of the service life of concrete structures. Used for durability-based quality control purposes, the constant voltage (V) is applied to a concrete specimen for 6 hours and the current passing through the concrete is recorded to find the coulombs.
This test determines the electrical conductance of the different grades of concrete mixes and indicates its resistance to the penetration of chloride ions. Standardized testing procedures are in AASHTO T 277 or ASTM C 1202.
It monitors the amount of electrical current passed via concrete specimens for a specified time. The movement of ions in a porous medium under a concentration gradient is called diffusion. It is often necessary to ascertain the impermeability of concrete to chloride ions as a quality control measure and assessment of improvements in properties of new concrete.

[@varadareddy9813]

very good information 👌