Study on the Flexural Performance of Hybrid-Reinforced Concrete Beams with a New Cathodic Protection System Subjected to Corrosion

Abstract

Steel corrosion is considered as the main factor for the insufficient durability of concrete structures, especially in the marine environment. In this paper, to further inhibit steel corrosion in a high chloride environment and take advantage of the dual-functional carbon fiber reinforced polymer (CFRP), the impressed current cathodic protection (ICCP) technique was applied to the hybrid-reinforced concrete beam with internally embedded CFRP bars and steel fiber reinforced polymer composite bar (SFCB) as the anode material while the steel bar was compelled to the cathode. The effect of the new ICCP system on the flexural performance of the hybrid-reinforced concrete beam subjected to corrosion was verified experimentally. First, the electricity-accelerated precorrosion test was performed for the steel bar in the hybrid-reinforced beams with a target corrosion ratio of 5%. Then, the dry–wet cycles corrosion was conducted and the ICCP system was activated simultaneously for the hybrid-reinforced concrete beam for 180 days. Finally, the three-point bending experiment was carried out for the hybrid-reinforced concrete beams. The steel bars were taken out from the concrete to quantitatively measure the corrosion ratio after flexural tests. Results showed that the further corrosion of steel bars could be inhibited effectively by the ICCP treatment with the CFRP bar and the SFCB as the anode. Additionally, the ICCP system showed an obvious effect on the flexural behavior of the hybrid-reinforced concrete beams: The crack load and ultimate load, as well as the stiffness, were enhanced notably compared with the beam without ICCP treatment. Compared with the SFCB anode, the ICCP system with the CFRP bar as the anode material was more effective for the hybrid-reinforced concrete beam to prevent the steel corrosion.

Nghiên cứu thực nghiệm sự làm việc chịu uốn của dầm bê tông cốt hỗn hợp thép và polyme cốt sợi thủy tinh (GFRP) bị ăn mòn bởi ion clorua

“…Các kết quả thu được đều cho thấy, sử dụng cốt SGFRP làm cốt chịu lực trong kết cấu bê tông chịu uốn có thể khắc phục được những nhược điểm của việc sử dụng hoàn toàn cốt GFRP, nhất là trong việc hạn chế tình trạng nứt và phá hoại đột ngột. Đồng thời, sử dụng cốt SGFRP với cốt GFRP đặt phía ngoài, là một giải pháp phù hợp cho kết cấu bê tông làm việc trong môi trường xâm thực [18].…”

Dynamic Responses of Blast-Loaded Shallow Buried Concrete Arches Strengthened with BFRP Bars

“…FRP (fiber reinforced polymer) materials have good corrosion resistance, lightweight, high strength, and excellent magnetic transparency. Hence, they have great potential for improving the overall performance of concrete structures [4][5][6][7][8]. Common FRP materials include BFRP (basalt fiber reinforced polymer), GFRP (glass fiber reinforced polymer), AFRP (aramid fiber reinforced polymer), and CFRP (carbon fiber reinforced polymer).…”

Effective Use of Sacrificial Zinc Anode as a Suitable Repair Method for Severely Damaged RC Members Due to Chloride Attack

“…Impressed current cathodic protection is preferred to be implemented in wide and severe RC structures exposed to the marine environment. Hybrid cathodic protection technology using sacrificial anodes and impressed current methods was developed by researchers [18][19][20][21]. For the impressive current cathodic protection, regular monitoring in order to assess the levels of cathodic protection being afforded to the structure is required.…”