Abstract
The bond behavior of concrete planted in varying size re-bar D19, D32, D43 and D57 subjected to a cyclic loading pullout test, was investigated through a systematic experiment accompanying with a real-time acoustic emission (AE) monitoring. Another series of tests of concrete including an existing crack repaired by epoxy were also engaged to compare the behavior of repaired concrete under cyclic loading. The ultimate bonding load capacity as well as ultimate bond stress increases with the steel bar size. The repaired bonding load capacity of concrete turns out higher than those un-cracked. In addition, the slip at ultimate peak load is reduced with increasing in rebar diameter. The acoustic signals revealed by AE can be applied to analyze and compare the behavior of concrete with each sized re-bar. The information obtained from the test results provide useful technique to access the safety of NPP RC structure after reparation to resist the cyclic load.
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