An experimental study on the reduction of autogenous shrinkage of high strength concrete with bar restricted specimen

철근구속을 받는 고강도 콘크리트의 자기수축저감에 관한 실험 연구

In this paper, to seek a solution of reducing autogenous shrinkage three types of bar restricted concrete specimens which have similar compressive strength were tested. The three type of concrete were plain concrete-P25 type, $10^{\circ}C$ fly-ash replaced concrete-F10 type, and $1^{\circ}C$ expansion admixture replaced concrete-SP1 type, and with the test result an experimental study was conducted to gain the tensile stress of concrete. From the result of P25, SP1, F10 tests, it was found that by the age of 14 the ratios of tensile stress to tensile strength of three specimens are $75^{\circ}C$, $47^{\circ}C$, $52^{\circ}C$ respectively. so we came to a conclusion that the SP1-type concrete has better capacity to reduce autogenous shrinkage than F10-type concrete at similar compressive strength condition.