General Information on Deterioration of Existing Concrete Structures and Recent Research Topics on the Maintenance Techniques in Pwri

Many concrete structures have been constructed in Japan. Some concrete structures show severe deterioration and need repair or strengthening to keep their serviceability. Development of strategic maintenance is the highest priority under the background of aging of huge amount of stock of concrete structures and restrained budget. Public Works Research Institute has been undertaking comprehensive research projects for effective maintenance techniques for existing concrete structures. As part of the research, we carried out nationwide survey of soundness of concrete structures and maintenance cost of concrete structures deteriorated by salt attack. In this paper, the research results are introduced and discussed to recognize importance of preventative maintenance against deterioration of salt induced corrosion.