Recently, the number of deteriorated concrete structures has been increased and well known to the public. Also, the reinforced concrete structures at ports and harbours have been damaged by salt induced attack, which causes the corrosion of the reinforcing steel bars. Especially, the damages of salt injury are severe at the superstructures of wharves.
　In 1987, Bureau of Port and Harbour carried out an detailed survey on the deterioration of the 16 superstructures of wharves in 11 ports. The survey contained some main factors such as cover depth, concrete strength, the potentials of embedded bars and chloride contents in concrete. The collected data are analysed by the authors to clarify the influences of these factors on the, Hidenori HAMADAeterioration.
　In this paper, the results of the survey and analysis are presented.