Quantification of the Influence of Concrete Width per Fiber Strand on the Splitting Crack Failure of Textile Reinforced Concrete (TRC).

Markus Beßling,Jeanette Orlowsky

doi:10.3390/polym14030489

Abstract

The composite material textile reinforced concrete (TRC) requires a high bond performance between the fiber strand and the concrete matrix. While the influence of the textile on bond behavior is well known, in this publication the influence of the concrete matrix is investigated by means of single-sided pull-out tests. The results of the presented study show dependence between the concrete strength and bond performance of the composite material. When a concrete of a higher-strength class is used, the bond-flow–pull-out distance curve shifts upward independent of the textile geometry and the yarn impregnation. A simplified model is presented to predict the occurrence of a crack along the fiber strand. This model serves as a basis to investigate the correlation between concrete width per fiber strand and resistance against a splitting crack. The effective concrete tensile strength decreases to about 35% when the concrete width is increased from 10 mm to 50 mm. To quantify the decrease, a mathematical relationship, which describes the test results independent of textile and concrete type, is proposed.

Highlights

The composite material textile reinforced concrete (TRC) requires a high bond performance between the fiber strand and the concrete matrix
The composite material textile reinforced concrete (TRC), which is composed of a textile reinforcement and a concrete matrix with a small maximum grain size, is increasingly establishing itself in the construction industry
In addition to the high tensile strength of carbon fibers, the geometry of textile reinforcement combined with a stiff impregnation can lead to high bond performance

Summary

Introduction

The composite material textile reinforced concrete (TRC) requires a high bond performance between the fiber strand and the concrete matrix. The results of the presented study show dependence between the concrete strength and bond performance of the composite material. Quantification of the Influence of Concrete Width per Fiber Strand on the Splitting Crack Failure of Textile. In addition to the high tensile strength of carbon fibers, the geometry of textile reinforcement combined with a stiff impregnation can lead to high bond performance. If the transversal forces resulting from the bond exceed the resistance forces of the concrete matrix, cracking will occur along the fiber strand. In components made of TRC, failure can often be observed due to spalling of the concrete cover and/or longitudinal cracking (see Figure 1). Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations

Results

Discussion

Conclusion