Abstract
In this paper, the damage of a reinforced concrete (RC) column with various levels of reinforcement corrosion under axial loads is characterized using the acoustic emission (AE) technique. Based on the AE rate process theory, a modified damage evolution equation of RC associated with the axial load and different corrosion rates is proposed. The experimental results show that the measured AE signal parameters during the loading process are closely related to the damage evolution of the RC column as well as the reinforcement corrosion level. The proposed modified damage evolution equation enables dynamic analysis for the damage of corrosion on a RC column under axial loading for a further real-time quantitative evaluation of corrosion damage on reinforced concrete.
Highlights
The safety and durability of reinforced concrete (RC) structures during their service lifetime are mainly dependent on reinforcement corrosion, which can lead to concrete cracking [1,2,3]
A total of eight RC column specimens were prepared and divided into four groups prior to inducing the impressed current, the specimens were soaked in a 3.5% NaCl solution with different levels of reinforcement corrosion, namely, 0% (Z-0), noncorroded as a reffor 72 h
The Acoustic emission (AE) rate increased with the increase of the corro1. sionThe corrosion degree in RC can be monitored byThe the values
Summary
The safety and durability of reinforced concrete (RC) structures during their service lifetime are mainly dependent on reinforcement corrosion, which can lead to concrete cracking [1,2,3]. The AE rate process theory has been widely used to quantitatively investigate the internal damage evolution of concrete materials. Ohtsu et al [16] proposed the AE rate theory to evaluate the compressive strength of actual concrete structures and the process of steel corrosion with the moment tensor theory [17]. Suzuki et al [18] took samples from an existing bridge structure and performed AE monitoring in the uniaxial compression process. They noted that the variation of damage was consistent with that of the compressive strength. A modified damage evolution model of a corroded RC column was proposed This model provides real-time monitoring of the damage of corroded RC and quantitatively evaluates the damage degree from corrosion
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