Chloride Migration

To perform Chloride Migration tests, concrete cylindrical specimens with a diameter of 100 mm are prepared at the project site. The specimens are recommended to be cured for 28 days before conducting the tests, but cored specimens can also be used.

Once the required pre-conditioning is done, the specimen is placed in specially designed cells with reservoirs at both ends. These reservoirs are filled with solutions that are either chloride-free or contain chloride, depending on the test being conducted. Different solutions are prepared for different tests.

To rapidly force the chloride ions into the concrete specimen, an electric voltage is applied between two external electrodes.

Once the required duration of testing is completed, the specimen is taken out from the cells and split. A suitable color indicator solution is used to determine the penetration depth of free chloride ions in the concrete. Based on the measured depth of penetration, the magnitude of the applied voltage, and other measured parameters, the chloride migration coefficient is calculated.

The Chloride Migration test is a valuable tool for Engineers as it provides an indication of the durability and long-term performance of concrete. By performing this test, designers, concrete technologists, concrete producers, and engineering consultants can assess the durability performance of concrete before, during, and after construction.

By using migration testing, Engineers can enhance the durability assessment of concrete used in civil engineering structures. This can help in the selection of appropriate materials and construction methods, ensuring the long-term performance and safety of the structures. Overall, the Chloride Migration test plays an important role in improving the quality and durability of concrete structures, providing valuable information to Engineers throughout the construction process.