THE RELATIONSHIP BETWEEN ACCELERATED MIGRATION TIME IN ACMT AND PONDING TIME IN PONDING TEST FOR CEMENT-BASED MATERIALS

The salt ponding test has been widely used in recent year to evaluate the durability of cement-based materials. However, the duration of more than 90 days salt ponding is considered as time-consuming. In this study, the electrochemical technique (ACMT; Accelerated Chloride Migration Test) is applied to accelerate the movement of chloride ion in the cement-based materials to reduce the duration of testing time. The chloride profiles are obtained from ponding test with various ponding times and ACMT with different accelerated migration times. The total amount of chloride in specimens are calculated from the profiles and compared. Based on the total amount of chloride, the equivalent accelerated chloride migration time to the ponding time is obtained. The experimental result shows that the total amount of chloride for the 9-, 10-, 11-, and 12-h accelerated migration time in ACMT is close to the 60-, 90-, 120-, and 150-days ponding time in ponding test, respectively.