Flexural toughness of hybrid fiber-reinforced ultra-high performance concrete

被引：0

作者：

Deng Z. ^{[1
]}

Xue H. ^{[2
]}

机构：

[1] College of Architecture and Civil Engineering, Beijing University of Technology, Beijing

[2] Beijing Municipal Engineering Research Institute, Beijing

来源：

Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | 2023年 / 44卷 / 08期

关键词：

bending toughness; equivalent bending strength; failure mode; hardening index; hybrid fiber; postpeak bending strength; scanning electron microscopy; ultra-high performance concrete;

D O I：

10.11990/jheu.202109043

中图分类号：

学科分类号：

摘要：

A total of 33 four-point bending beam tests were conducted to investigate the contribution of the single addition of steel fiber (SF), SF blended with coarse polyolefin fiber, polyvinyl alcohol fiber, polyester fiber, glass fiber, and basalt fiber to study the toughening characteristics of hybrid fiber-reinforced ultra-high performance concrete (UHPC) and to improve the bending toughness of UHPC beams. The influence of fiber type and geometric size on the toughening effect of the beam was analyzed, and the cross-sectional shape of the specimen was scanned by an electron microscope. Results showed that compared with the single-doped SF, the hybrid fiber UHPC had better bending-deflection hardening properties and retained higher bearing capacity in the late stage of deformation. The hardening index proposed in this study can well characterize the hardening properties of the hybrid fiber UHPC. In this study, the toughening characteristics and mechanism of the hybrid fiber UHPC were clarified, and the evaluation index of the flexural toughness of the hybrid fiber UHPC was proposed. This index can provide a reference for practical engineering applications. © 2023 Editorial Board of Journal of Harbin Engineering. All rights reserved.

引用

页码：1288 / 1294

页数：6

共 15 条

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