Polarization Induced Deterioration of Reinforced Concrete with CFRP Anode

Materials

Ji-Hua Zhu²  Liangliang Wei²  Miaochang Zhu²  Hongfang Sun²  Luping Tang¹  Feng Xing² 

[1] Department of Civil and Environmental Engineering, Chalmers University of Technology, Gothenburg SE-412 96, Sweden; E-Mail:;Guangdong Province Key Laboratory of Durability for Marine Civil Engineering, School of Civil Engineering, Shenzhen University, Shenzhen 518060, Guangdong, China; E-Mails:

关键词: polarization;    interface deterioration;    reinforced concrete;    CFRP anode;   

DOI  :  10.3390/ma8074316

来源: mdpi

【 摘 要 】

This paper investigates the deterioration of reinforced concrete with carbon fiber reinforced polymer (CFRP) anode after polarization. The steel in the concrete was first subjected to accelerated corrosion to various extents. Then, a polarization test was performed with the external attached CFRP as the anode and the steel reinforcement as the cathode. Carbon fiber reinforced mortar and conductive carbon paste as contact materials were used to adhere the CFRP anode to the concrete. Two current densities of 1244 and 2488 mA/m², corresponding to the steel reinforcements were applied for 25 days. Electrochemical parameters were monitored during the test period. The deterioration mechanism that occurred at the CFRP/contact material interface was investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. The increase of feeding voltage and the failure of bonding was observed during polarization process, which might have resulted from the deterioration of the interface between the contact material and CFRP. The formation and accumulation of NaCl crystals at the contact material/CFRP interface were inferred to be the main causes of the failure at the interface.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.