Abstract
This research investigated the fresh concrete properties, mechanical properties and early shrinkage crack of hydrophilic polyvinyl alcohol(PVA) fiber reinforced concrete with fiber volume fraction and fiber length. The effects of differing fiber volume fraction(0.05%, 0.07%, 0.1%, 0.15%) and fiber length(4 mm, 6 mm, 8 mm, 12 mm) were studied. Test was conducted with slump, air content, compressive strength, flexural performance, and plastic shrinkage crack of PVA fiber reinforced concrete. Test results indicated that PVA fiber reinforcement showed an ability to reduce the total crack area, maximum crack width. Also, the mechanical properties test showed that the addition of PVA fiber improved mechanical performance. Specially, optimum PVA fiber reinforced concrete were obtained using 4mm or 6mm fiber length and 0.07% fiber volume fraction.
본 연구는 섬유 혼입률 및 길이변화에 따른 친수성 폴리비닐알코올(PVA) 섬유보강 콘크리트의 굳지 않은 콘크리트 특성, 초기균열 특성 및 역학적 특성을 평가하였다. PVA 섬유의 길이(4 mm, 6 mm, 8 mm, 12 mm) 및 혼입률(0.05%, 0.07%, 0.1%, 0.15%) 변화에 따른 특성을 연구하였다. 실험은 슬럼프, 공기량, 압축강도, 휨성능 및 소성수축균열시험을 실시하였다.실험결과 PVA 섬유의 혼입은 콘크리트의 균열 폭 및 균열면적을 감소시키고, 또한 역학적 특성을 증가시키는 효과를 보여주었다. 특히, PVA 섬유의 길이 4 mm, 6 mm의 혼입률 0.07%에서 최적의 PVA 섬유보강 콘크리트를 획득할 수 있었다.