为了研究织物增强混凝土(TRC)加固层与老混凝土之间的粘结性能,本文对用织物增强混凝土(TRC)薄层加固的RC构件进行了界面剪切试验。粘结试件结合面处分别进行了人工凿糙和植抗剪钢筋两种处理方式,考察了不同界面处理方法对其剪切性能的影响,并探讨了不同粗糙度及植筋率对界面抗剪强度的影响规律。试验结果表明,结合面凿糙和植筋处理均能提高TRC加固层和老混凝土间的粘结性能,凿糙试件的粘结抗剪强度提高幅度较大,其最佳灌砂平均深度范围为2.0mm-4.0mm,植筋试件的粘结抗剪强度和延性均有所提高。
In order to study on the bonding behaviour of TRC for strengthening, the shear experiment research on TRC strengthening layer and the old concrete are performed in this paper. The effects of different interfacial techniques, i.e., artificial chiseling, and reinforced bar planting, on the shear properties are investigated, and the influence law of different roughness and ratio of planting reinforced bar on the interface shear strength are studied. The experimental results show that the bonding behaviour between TRC sheet and old concrete are improved prominently by the above two different interfacial techniques. The shear strength of specimens increases greatly when the technique of artificial chiseling is used, and the range of 2.0 - 4.0mm is recommended as the best average sand - pouring depth. Furthermore, reinforced bar planting can also improve the shear strength and ductility of the specimens.