플라이애시 혼입 콘크리트의 내구성 평가

Durability Evaluation of concrete using fly ash

The concrete structures in marine environment has been used type V cement(sulfate-resisting Portland cement), but according to the study results reported recently, the question has been raised for effect of the resistance to salt attack of the concrete using type V cement. It is increased the demands on the use of mineral admixtures such as fly ash, ground granulated blast-furnace slag instead of type V cement in order to improve the durability of concrete structures. Therefore, this study focused on the durability evaluation of concrete containing fly ash under marine environment, and the tests such as salt attack, carbonation, sulfate attack, and freezing-thawing were performed. Test results showed t]hat the resistance to salt attack, sulfate attack and freezing-thawing was improved, and the carbonation was in some disadvantage compared with normal concrete. Nevertheless, the durability of fly ash concrete would be maintained during the service life of structures.