Du Yunxing, Zhang Xinying, Liu Lingling, Zhou Fen, Zhu Deju, Pan Wei
Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province, Changsha 410082, China.
College of Civil Engineering, Hunan University, Changsha 410082, China.
Polymers (Basel). 2018 Jan 20;10(1):98. doi: 10.3390/polym10010098.
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.
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织物增强混凝土（TRC）弯曲性能的影响。随着织物层数的增加，试件的破坏模式从粘结破坏转变为剪切破坏，并伴有基体与织物界面的粘结破坏。在TRC试件中加入钢纤维后，织物与基体之间的界面粘结性能得到改善。预应力或钢纤维的存在提高了TRC试件的初裂应力和极限应力。与初裂应力相比，加入钢纤维后极限应力的提高更为显著。然而，发现预应力对初裂应力的影响比对极限应力的影响更为显著。预应力与钢纤维相结合进一步改善了TRC试件的弯曲性能。钢纤维体积含量为1%的预应力TRC试件有效地避免了粘结破坏。因此，可以提高织物的利用率。
