Rapid Chloride Permeability Test
The Rapid Chloride Permeability Test (RCPT) apparatus is a specialized instrument used to determine the resistance of concrete to chloride ion penetration, as per ASTM C1202 or AASHTO T277 standards. Chloride ingress is a major cause of steel reinforcement corrosion in concrete, and this test helps evaluate the durability and long-term performance of concrete structures. The test involves applying a constant electrical potential (usually 60V DC) across a concrete specimen, which is placed between two cells—one filled with sodium chloride solution and the other with sodium hydroxide solution. The total charge passed (in coulombs) over a fixed period (typically 6 hours) indicates the permeability of the concrete to chloride ions.
Features:-
- Standard Compliance – Designed as per ASTM C1202 / AASHTO T277 standards.
- Specimen Capacity – Generally tests 100 mm diameter × 50 mm thick concrete specimens.
- Dual Cell Assembly – Two chambers provided for NaCl and NaOH solutions, separated by the test specimen.
- Voltage Application – Constant 60 V DC power supply with digital display and control.
- Current Measurement – Microprocessor-based monitoring system records current passing through the specimen at regular intervals.
- Data Logging – Some advanced models include PC connectivity and software for real-time data acquisition and automatic charge (coulomb) calculation.
- Durability Assessment – Provides a rapid indication of concrete’s resistance to chloride ion penetration, linked to its durability against corrosion.
- Cooling Provision – Optional water bath or cooling arrangement to prevent overheating during long-duration tests.
- Portable & Compact – User-friendly design suitable for laboratory and on-site quality control testing.
