Investigation and detection on corrosion of concrete structure in marine environment

Abstract

Due to the effect of marine environment, the corrosion of steel reinforcement in concrete structure is a very serious issue, so the field detection of steel reinforcement corrosion is very important. The Lianyun Harbor, a famous sea harbor in China with more than one hundred year history, was chosen to do the case study of the field detection. The corrosion ratio of the sampled steel reinforcement was obtained according to the field investigation in Lianyun Harbor and the experiment done in the laboratory. The chloride concentration in the concrete of different position and the sampled concrete at different depths in the splash zone was also measured in the laboratory. Moreover, the corrosive parameter of concrete structure was obtained by statistical analysis. The test results indicate that the reinforcement corrosion was very serious. The corrosion ratio of the sampled steel reinforcement and the concentration of chloride in concrete samples were both very high, which showed that Berth 14# in Lianyun Harbor was deteriorated badly. The chloride content at splash zone of Berth 57# and Berth 58# were also very high, which indicated that the chloride penetration for reinforcement concrete structures was very serious. The bearing capacity and the reliability of members could be calculated based on experiment data. The bearing capacity and the reliability of members decreased obviously and the members were needed to be maintained and strengthened in time.