The Carbonation Model of Concrete Structures and Its Application

Carbonization is one of the main factors affecting the durability of concrete structures in atmospheric environment.According to the theory of reliability and the climate forecast data, using the concrete carbonation prediction model improved, the time-dependent reliability of concrete structures were researched, for three environmental classes of I environment in china Code for durability of concrete structures.The study results showed: (1) In this paper, the results of the improved concrete carbonation prediction model was in good agreement with those of other reference's concrete carbonation prediction models.(2) When the carbonation emission scenarios would make CO 2 concentration to be higher, then this would lead to the carbonation depth in concrete cover and cumulative failure probability to increase more.But the carbonation depth in concrete cover and cumulative failure probability would decrease more when environmental effect being more serious; for concrete carbonation development was delayed by raising the concrete minimum strength, increasing concrete cover depth, and decreasing concrete Maximum water cement ratio.(3) Improving the concrete strength and the concrete cover depth should be done in future concrete structures design to improve the concrete carbonation resistance and concrete structures durability.