2011 Volume 65 Issue 1 Pages 464-469
Recently, ultra high strength concrete（UHSC）over compressive strength of 150N/mm2 was developed. Ultra high strength concrete property is determined by its composition such as cement type, fine aggregate, coarse aggregate. Especially coarse aggregate was critical for making UHSC, because stress concentration is occurred at contact zone of aggregate and cement matrix. In this study, we applied to nonlinear voxel finite element method with three dimensional image of concrete. As a result, static elastic modulus and compressive strength was able to predict by this method within 10％ in error. Moreover, it was shown that the fracture strength of coarse aggregate, and the difference between the elastic modulus of mortar matrix and coarse aggregate is very important to achieve the ultra high strength of concrete.
