Efecto de las cargas cíclicas sobre la adherencia hormigón-acero en hormigones sumergidos

This paper concerns research undertaken into the bond strength between reinforcement and underwater concrete for concrete cylinder strength of 40 MPa. Monotonic and cyclic loading has been applied to 5 cycle samples sets (namely 1, 2000, 20,000, 200,000, and 2,000,000 cycles). The results show that, for monotonic loading, the τu values in underwater samples reduce by 5% compared to samples cast in dry conditions. In addition the monotonic tests on the samples subjected to high cyclic loading show an increase in the τu value compared to those samples not subjected to cyclic loading. This may be a result of the micro-compaction experienced by the concrete due to the high cyclic loading, which leads to an increase in compressive resistance.