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Experimental study on the mechanical properties of textile reinforced mortar (TRM) composites with different yarn shapes subjected to uniaxial tension

Dong Zhifang, Dai Jie, Deng Mingke, Wu Zhiyan

Archives of Civil and Mechanical Engineering

2022

Vol. 22, no. 4

art. no. e185, 2022

Textile reinforced mortar (TRM) has been applied to retrofit or reinforce the masonry and reinforced concrete (RC) buildings due to the promising tensile properties. The presented work mainly investigated the tensile behaviors of TRM composites with different shapes of carbon multifilament yarns and types of matrices. The flatter shape of yarn has a larger bonding area for the same cross section area of the yarns compared with the elliptical ones. The specimens reinforced with the elliptical and flatter sectional shape of yarns were compared in terms of failure mode, tensile strength, tensile stress–strain response and strain energy. The results showed that the tensile strength can be enhanced by 11% ~ 67%. The utilization of the textiles in the matrix was significantly improved. It demonstrated the fact that the stress difference between the core and outer of yarns was significantly reduced. The flatter shape of yarn effectively contributed to the enhancement of bonding property. The slippage between yarns and matrix was prevented owning to the larger bonding area. Finally, based on the shape coefficient related to the section shape of the yarn, a modified index model was suggested to predict the tensile strength.