Abstract
Four-point bending tests were adopted to investigate the influences of the number of textile layers, volume content of steel fibres, and prestress on the flexural behaviour of carbon textile-reinforced concrete (TRC). The failure mode of the specimen changed from debonding failure to shear failure, accompanied by the matrix-textile interfacial debonding with an increasing number of textile layers. The interfacial bonding performance between the textile and matrix improved with the addition of steel fibres in the TRC specimens. The presence of prestress or steel fibres improved first-crack and ultimate stresses of the TRC specimen. In comparison with the first-crack stress, a more pronounced enhancement in the ultimate stress was achieved by the addition of steel fibres. However, the effect of prestress on the first-crack stress was found to be more significant than on the ultimate stress. The prestress combined with steel fibres further improved the flexural behaviour of the TRC specimens. The prestressed TRC specimens with 1% volume content of steel fibres effectively avoided debonding. Thus, the utilization of the textiles could be improved.
Highlights
Textile-reinforced concrete (TRC) is a novel composite construction material consisting of a fine-grained concrete matrix and high-performance textile made of various fibres, such as alkali-resistant (AR) glass, carbon, or polymer fibres
The study reported in this paper aims to add steel fibres in the TRC specimens and apply prestress on the textile to improve the interfacial bonding performance between the textile and matrix and the flexural behaviour of the TRC
With the increase in the number of textile layers, a significant improvement on the bearing capacity of the specimens and a smaller reduction in the flexural stiffness of the cracked specimens capacity of the specimens and a smaller reduction in the flexural stiffness of the cracked specimens were observed; in addition, the failure mode of the specimen changed from debonding failure to were observed; in addition, the failure mode of the specimen changed from debonding failure to shear failure accompanied by the matrix-textile interfacial debonding
Summary
Textile-reinforced concrete (TRC) is a novel composite construction material consisting of a fine-grained concrete matrix and high-performance textile made of various fibres, such as alkali-resistant (AR) glass, carbon, or polymer fibres. The textile used in TRC is characterized by its high tensile strength and ductility. It is a good alternative for reinforcing the plain concrete. Co-working among the filaments of the textile is significantly improved after impregnation of textiles with polymers, but the impregnated textiles are separated from the matrix. In this case, the stiffness of the TRC flexural component is obviously reduced, and the high tensile strength of the carbon textile is not fully exploited.
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