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Flexural Behaviour of Carbon Textile-Reinforced Concrete with Prestress and Steel Fibres

机译:碳纤维预应力钢纤维混凝土的弯曲性能

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摘要

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.
机译:采用四点弯曲试验研究了织物层数,钢纤维体积含量和预应力对碳纤维增强混凝土(TRC)弯曲性能的影响。样品的破坏模式从脱粘破坏变为剪切破坏,伴随着基体-纺织品界面的脱粘以及织物层数的增加。在TRC样品中添加钢纤维可改善纺织品与基质之间的界面粘合性能。预应力或钢纤维的存在改善了TRC试样的第一裂纹和最终应力。与第一裂纹应力相比,通过添加钢纤维,最终应力得到了更明显的增强。但是,发现预应力对初次裂纹的影响比对最终应力的影响更大。预应力与钢纤维的结合进一步改善了TRC试样的弯曲性能。钢纤维体积含量为1%的预应力TRC样品有效地避免了脱胶​​。因此,可以提高纺织品的利用率。

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