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Influence of short dispersed and short integral glass fibres on the mechanical behaviour of textile-reinforced concrete

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Abstract

This article addresses the influence of the addition of short dispersed and short integral fibres made of alkali-resistant (AR) glass on the fracture behaviour of textile-reinforced concrete (TRC) subject to tensile loading. A series of uniaxial, deformation-controlled tension tests was performed to study the strength, deformation, and fracture behaviour of thin, narrow plates made of TRC, both with and without the addition of short fibres. Additionally, uniaxial tension tests on specimens reinforced with only short fibres were performed to figure out the difference in behaviour in the absence of textile reinforcement. Furthermore, multifilament-yarn and single-fibre pullout tests were carried out to gain a better understanding of bonding properties and crack-bridging behaviour. While pronounced enhancement of first-crack stress was achieved due to the addition of short dispersed fibres (the value increased by a factor of 2), a significant improvement in tensile strength was recorded for TRC specimens with the addition of integral glass fibres; the value increased by approximately 30 %. Moreover, TRC specimens reinforced with short dispersed glass fibres showed formation of more and finer cracks in comparison to the specimens with integral fibres. It was also found that short integral fibres can improve the bond between multifilament-yarns and the surrounding matrix by means of “special” cross-links. In TRC with short dispersed fibres this phenomenon was less pronounced. The investigations were accompanied by microscopical investigations which provided additional basis for an in-depth discussion of the decisive working mechanisms of hybrid reinforcement.

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Acknowledgments

This project was initiated in the Collaborative Research Centre SFB 528 “Textile Reinforcement for Structural Strengthening and Retrofitting” financed by the German Research Foundation (DFG). The authors would like to acknowledge with gratitude the foundation’s financial support.

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  1. Institute of Construction Materials, Technische Universität Dresden, Würzburger Strasse 46, 01187, Dresden, Germany

    Rabea Barhum & Viktor Mechtcherine

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  1. Rabea Barhum
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  2. Viktor Mechtcherine
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Correspondence to Viktor Mechtcherine.

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Barhum, R., Mechtcherine, V. Influence of short dispersed and short integral glass fibres on the mechanical behaviour of textile-reinforced concrete. Mater Struct 46, 557–572 (2013). https://doi.org/10.1617/s11527-012-9913-3

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  • DOI: https://doi.org/10.1617/s11527-012-9913-3

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