AN INVESTIGATION OF CRACKING IN REINFORCED ULTRA HIGH STRENGTH CONCRETE FRAME

Abstract

Using low water cement ratio composition and silica fume is very effective to obtain the high strength concrete. However, it is often indicated that autogenous shrinkage strain increases in high strength concrete because of finer microstructure of hydrated cement paste. Therefore it is important to consider the influence of autogenous shrinkage when conducting the stress analysis of ultra high strength concrete structural members. In this study ,we analyzed the stress of reinforced ultra high strength concrete frame considering the influence of not only thermal stress but also stress due to autogenous shrinkage. Cracking in the structural members which could not be explained by only thermal stress, could be explained by considering the influence of the stress due to autogenous shrinkage.