Fracture behaviors of hybrid steel-PVA fiber reinforced high strength recycled aggregate concrete

被引：0

作者：

Luo S. ^{[1
]}

Lin Y. ^{[1
]}

Xiao J. ^{[1
,2
]}

机构：

[1] College of Civil Engineering, Fuzhou University, Fuzhou

[2] College of Civil Engineering, Tongji University, Shanghai

来源：

Jianzhu Jiegou Xuebao/Journal of Building Structures | 2020年 / 41卷 / 12期

关键词：

Fracture behavior; Fracture test; High strength recycled aggregate concrete; Hybrid effect; PVA fiber; Steel fiber;

D O I：

10.14006/j.jzjgxb.2020.0083

中图分类号：

学科分类号：

摘要：

To improve the fracture behaviors of recycled aggregate concrete, the effect of steel fiber and hybrid steel- polyvinyl alcohol (steel-PVA) fiber on the fracture properties of high strength recycled aggregate concrete (RAC) was studied by three-point bending beam test. The results show that the high strength RAC without fiber has obvious brittle behavior and the fracture properties are poor. It is observed that the fracture failure of steel fiber reinforced high strength RAC and hybrid steel-PVA fiber reinforced high strength RAC is significantly delayed. Compared with the steel fiber reinforced high strength RAC, the load-deformation curves of the hybrid steel-PVA fiber reinforced high strength RAC are plumper, and each downward part of the curves is more gradual. The unstable fracture toughness and fracture energy of the steel fiber reinforced high strength RAC are increased significantly, but the crack initiation fracture toughness is limitedly improved. While the fracture behaviors of the hybrid steel-PVA fiber reinforced high strength RAC are improved obviously, especially the crack initiation toughness. When the 1.0% steel fiber is mixed with the 0.2% PVA fiber, a better hybrid effect is obtained, and the improvement effect on the fracture behaviors of high strength RAC is optimal. © 2020, Editorial Office of Journal of Building Structures. All right reserved.

引用

页码：93 / 102

页数：9

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