Domestic Study on the Durability of Reinforced Concrete to Salt Damage in Taiwan Coastal Environment

This study is main on the durability of reinforcement concrete structures in salt damage environment. It had been discussed the relationship between concrete materials and environmental parameters through the investigation of air borne chloride in the coastal region of Taiwan and the sampling of existed old structures in same areas. The tests included the investigation of air borne chloride in the atmosphere, the infiltration behavior of chloride ion in on-site concrete, the chloride diffusion coefficient, etc. Based on the test results, the correlation between the chloride content on concrete surface and air borne chloride had been established. Further, the domestic durability analysis model of salt damage was proposed depending on the test result of chloride diffusion coefficient. Then the required cover thickness in various conditions of concrete mixing proportion and air borne chloride environment could be estimated. The suggestions from this research based on actual environmental survey data can be used to initially define the distribution of salt injury in each county, and to provide adequate design thickness of covering for RC. The procedures and recommendations of this research can also helpfully assist the engineers on designs of chloride-resistant and economic costal structures. © 2019, Chinese Institute of Civil and Hydraulic Engineering. All right reserved.