Seismic behavior of corrosion-damaged RC columns strengthened with TRC under a chloride environment

The reinforced concrete structures are easy to cause steel corrosion in an erosion environment for a long time and reduce the seismic performance of the structures in the coastal area on the seismic belt. Small parts of seriously damaged RC structures should be demolished and reconstructed, and a large number of earthquake-damaged RC structures can be retrofitted and used again. In this paper, the electrochemical corrosion test is carried out to accelerate the corrosion of steel bars of RC columns, and then the columns strengthened with Textile-reinforced concrete (TRC). After that, columns strengthened are exposed to a chloride dry-wet cycle environment again. The low-frequency cyclic loading test was carried out to investigate the seismic performance of RC columns with different corrosion ratios which were strengthened and went through chloride salt dry-wet cycle. The experiment results show that with the initial corrosion ratio of steel increasing, yield load and peak load decreased, ductility and energy dissipation capacity increased firstly and then decreased in a chloride dry-wet environment. Compared with RC columns of which only reinforcements were corroded, the seismic performance of TRC reinforced corroded columns was better when the columns exposed to a chloride dry-wet environment and TRC could play a better role when the corrosion ratio was larger. In addition, an idea was proposed that TRC template can be used as a measure to delay the corrosion of reinforcements and improve the seismic performance of structures in the engineering. (C) 2019 Elsevier Ltd. All rights reserved.