Experimental study on the deterioration prediction of concrete structure by reliability theory

The prediction and evaluation of concrete service life are essential to the maintenance and durablity design concrete structures. The purpose of this study is to examine deterioration prediction of concrete structure by reliability theory to analyze data of RC model specimens during rapid freeze-thaw tests and exposure tests，large specimens during exposure tests at okhotsk shoreline， and mortal specimens during tensile strength test. These concrete durability data is assessed by reliability analysis. This analysis can predict the deterioration of concrete structures using reliability theory. From these examinations，we conclude that the Weibull distribution gives the best fit to frequency distribution of scaling that exceeds the hazard level in depth. The hazards were judged with the set-up ratio to each deterioration index. The water/cement ratio is important for covariant variable of reliability theory. When the water/cement ratio is low， the reliability is high. The service life and repair plan of RC structures can be estimated as time(year)on a index of reliability 75％，95％，etc