Analysis on Shrinkage Properties of High Performance Concrete According to Mock-Up Test

고성능 콘크리트의 Mock-Up 시험에 의한 수축특성 분석

This paper is to investigate the shrinkage properties of high performance concrete (HPC) with mixture adjustment by using mock-up specimens. HPC with mixture adjustment needed a higher dosage of SP agent due to fluidity reduction and a larger dosage of AE agent due to the reduction of air content. Setting time of HPC with mixture adjustment exhibited earlier than that of control HPC by as much as 6 hours. HPC with mixture adjustment gained more than 70MPa of compressive strength. Autogenous shrinkage of Control HPC was found to be $-340\times40^{-6}$ at 49days when the expansion value by thermal effect was excluded and HPC with mixture adjustment $-175\times10^{-6}$, which was the half of the value of control HPC. Drying shrinkage of center section of HPC with mixture adjustment showed similar tendency with autogenous shrinkage because of no internal moisture movement, while surface section had larger drying shrinkage. The specimen embedded with reinforcing bar had smaller deformation caused by confinement of reinforcing bar.