MICROCRACKS FORMED IN POROUS CONCRETE WITH OR WITHOUT SHORT FIBER REINFORCEMENT UNDER FREEZING ANDTHAWING ACTION

Abstract

 The purpose of this study is to clarify the effect of silica fume and fine fibers on the freeze-thaw resistance of porous concrete. The crack-inhibiting effect of fibers was also investigated by microscopically observing and quantitatively evaluating microcracks along and near interfaces between the matrix and aggregate, which cause low durability.
 As a result, the length and width of microcracks in fiber-reinforced porous concrete were found to widely differ from those of cracks in unreinforced porous concrete.