Hybrid effect of fibre mesh and short fibres on the biaxial bending behaviour of TRC

Dong Li,Yining Ding,Qing Wang,Cecilia Azevedo,Yongchao Zhang,Yulin Zhang

doi:10.1680/jmacr.17.00284

Dong Li, Yining Ding + Show 4 more

Open Access

https://doi.org/10.1680/jmacr.17.00284

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Abstract

Textile mesh-reinforced concrete (TRC) and mortar have been studied in recent years. However, current testing methods are focused on simply supported members under uniaxial bending; these are inadequate for analysis of a biaxially tensioned fibre mesh and incapable of revealing the biaxial behaviour of a TRC panel. Moreover, the fibres can be damaged by the alkalinity of concrete. To overcome this inadequacy, a series experiment of two-way panels is carried out. The methodology used here consists of the experiment and analysis of experimental data, including evaluation of the alkali resistance, biaxial bending capacity and toughness of two-way slabs. Suitable fibres are selected based on alkali resistance; the effect of fibre meshes on the biaxial bending capacity of the two-way TRC slabs is studied. By addressing the disadvantages of brittle fibre mesh-reinforced concrete compared with conventional reinforced-concrete panels, a significant improvement in the ductility of a TRC panel with steel fibres is achieved. Following the analysis of the experimental data, it can be concluded that a conventional steel mesh with reinforcement ratio of 0·2% can be replaced by a combination of glass or basalt fibre mesh and steel fibres.

Highlights

Series of previous investigations have reported that the mechanical properties of the concrete can be increased noticeably by the addition of discrete short fibers such as steel fiber, basalt fiber and plastic fiber etc (Alhozaimy et al, 1996; Ding et al, 2014; Enfedaque et al, 2010; Jain and Singh, 2013; Lee et al, 2016; Li and Xu, 2009; Lim et al, 2011; Ros et al, 2016; Sim et al, 2005; Singh, 2016; Song et al, 2004; Wang et al, 2009; You et al, 2017; Zollo, 1997)
The current testing methods are focused on supported member under uniaxial bending, which are inadequate for analyzing of the biaxial tensioned fiber mesh and incapable to reveal the biaxial behavior of the textile-reinforced concrete (TRC) panel
Following the analysis of the experimental data, it can be concluded that the conventional steel mesh with reinforcement ratio of 0.2% can be replaced by the combined use of glass/basalt fiber mesh and steel fibers

Summary

Introduction

Series of previous investigations have reported that the mechanical properties of the concrete can be increased noticeably by the addition of discrete short fibers such as steel fiber, basalt fiber and plastic fiber etc (Alhozaimy et al, 1996; Ding et al, 2014; Enfedaque et al, 2010; Jain and Singh, 2013; Lee et al, 2016; Li and Xu, 2009; Lim et al, 2011; Ros et al, 2016; Sim et al, 2005; Singh, 2016; Song et al, 2004; Wang et al, 2009; You et al, 2017; Zollo, 1997). Chira et al (2016) studied the flexural properties of a newly developed TRC façade panel, and Zargaran et al (2017) verified the effect of the parameters of the fiber mesh, the reinforcement ratio and the thickness of the specimen on the bending performance of TRC composites. The prerequisite for the constructive application of various fiber mesh in the infrastructure consists mainly of the following three points: 1) alkaline resistance of fiber mesh in the concrete matrix; 2) the positive effect of fiber mesh on the mechanical properties of concrete, especially on the biaxial tension behavior, and 3) the similar toughness and ductile failure pattern of TRC member compared to conventional steel mesh reinforced RC panel under bending. In order to enhance the toughness of the TRC and to replace the conventional steel mesh, the macro steel fiber was adopted, the hybrid effect of the combined use of fiber mesh and macro steel fiber was investigated

Experiments

Alkali resistance test

Findings

Conclusions