Study on the Flexural Performance of Hybrid-Reinforced Concrete Beams with a New Cathodic Protection System Subjected to Corrosion
Study on the Flexural Performance of Hybrid-Reinforced Concrete Beams with a New Cathodic Protection System Subjected to Corrosion
复制标题
新型阴极保护体系下钢筋混凝土梁受腐蚀性能研究
DOI：
10.3390/ma13010234
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发表时间：
2020-01-01
期刊：
影响因子：
3.4
通讯作者：
Huang, Xiaoxu
中科院分区：
文献类型：
--
作者：
Zhou, Yingwu;Zheng, Yaowei;Huang, Xiaoxu
钢筋锈蚀被认为是混凝土结构耐久性不足的主要因素，特别是在海洋环境中。为了进一步抑制高氯酸盐环境中钢筋的腐蚀，充分利用碳纤维增强复合材料(CFRP)的双重功能，将外加电流阴极保护(ICCP)技术应用于内埋CFRP筋和钢纤维复合材料筋(SFCB)为阳极材料的混杂钢筋混凝土梁中，同时将钢筋强迫到阴极。通过试验验证了新型ICCP体系对锈蚀混杂钢筋混凝土梁抗弯性能的影响。首先，对目标锈蚀率为5%的混杂钢筋梁中的钢筋进行了电加速预腐蚀试验。然后，对混杂钢筋混凝土梁进行干湿循环腐蚀，并同时激活ICCP系统180d。最后，对混杂钢筋混凝土梁进行了三点弯曲试验。弯曲试验后，从混凝土中取出钢筋，定量测量锈蚀率。结果表明，以CFRP筋和SFCB为阳极的ICCP处理能有效地抑制钢筋的进一步腐蚀。此外，ICCP体系对混杂钢筋混凝土梁的抗弯性能有明显的影响：与未加ICCP处理的梁相比，其裂缝荷载、极限荷载和刚度都有显著提高。与SFCB阳极相比，采用CFRP筋作为阳极材料的ICCP体系对混杂钢筋混凝土梁的防锈蚀效果更好。
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.