피복두께와 강섬유 혼입률에 따른 초고성능 콘크리트의 균열거동과 인장증강효과

초록

This study involved conducting material tests on ultra-high-performance concrete through direct tensile tests. The key variables examined werethe volume fraction of steel fiber and the cover thickness. This analysis focused on load-strain relationships, concrete tensile strength, averagecrack spacing, and maximum crack width. The results reveal that as the volume fraction of steel fiber increases and the cover thicknessbecomes greater, the concrete's ability to withstand tensile forces significantly improves, resulting in a more robust tension-stiffening effect. Furthermore, the crack behavior during the crack formation stage and stabilized cracking stage indicates improved crack control performance. After the initial crack formation stage, the concrete appears to no longer control additional tensile forces and cracks, with the primaryresponsibility for crack control shifting to the steel fibers. This transition enhances the tension-stiffening effect by bridging actions of thesteel fibers after the initial crack formation stage.

키워드