The Loading Capacity of RC Column Member with Termination Point of Main Reinforcement Affected by ASR

Abstract

The main reinforcement ratio of piers constructed before 1980, when the standards older than the 1980 specifications for road bridges were applied, is often around 1.0%, and at termination point of main reinforcement is less than 1/2, the main reinforcement ratio is less than 0.5%. In such piers, cracks due to ASR expansion are more likely to occur, and the effect on loading capacity is a concern. In this study, to clarify the seismic performance of piers with ASR deterioration, RC column specimens with ASR deterioration and non- deteriorated RC column specimens for comparison were fabricated to simulate the piers at that time, and the progress observation and loading tests were conducted on one non- deteriorated RC column specimen and two RC column specimens with ASR deterioration. The loading test results showed that the maximum load of the specimen with ASR deterioration increased due to chemical prestress compared to the specimen without ASR deterioration. However, the specimen with ASR deterioration decreased toughness compared with the specimen.