Abstract
Three large size specimens composed of a combination type self compacting concrete in the range of slump flow 45-76cm were manufactured 21 years ago. The concrete was placed without compaction. These specimens have been exposed to nearshore for 11 years, after that, these were exposed to 20km inland for another 10 years. Then the authors measured the properties of the concretes such as strength, porosity, carbonation depth, and chloride ion diffusivity. As a result, the porosity of the concretes was almost constant depending on neither slump flow nor flow distance. Then, it was found that the combination type self compacting concrete was more durable than conventional concrete with the same W/C. Thus, the carbonation depth of the self compacting concrete was 15-80 percent and the chloride ion diffusion coefficient was 1-10 percent of conventional concrete, respectively.
