2.EXPERIMENTAL STUDY ON DRYING SHRINKAGE AND CRACKING OF CONCRETE

Abstract

Confined shrinkage and free shrinkage tests have been made with specimens of concrete containing ordinary and light-weight aggregates. The conclusions obtained are: The amount of free shrinkage corresponding to the appearance of confined shrinkage is about 0.04% for concrete of ordinary aggregate and about 0.06% for light-weight aggregate concrete. The cracking of light-weight aggregate concrete is delayed as compared with that of ordinary aggregate concrete, while, once the crack has appeared in the former, the width thereof is larger and it may be more deterimental to the structure.