纤维编织网在细粒混凝土中的黏结和搭接性能

Investigation on Bonding and Overlapping Performance of Textile in Fine Grained Concrete

通过薄板试件的拉拔试验和四点弯曲试验研究了纤维编织网在细粒混凝土中的黏结和搭接性能.结果表明:纤维编织网的表面处理和经向纤维束对纤维编织网和细粒混凝土的界面黏结性能有着较为明显的影响;无论纤维编织网是粘砂还是不粘砂,随着碳纤维束初始埋长的增加,平均界面黏结强度有降低的趋势;当碳纤维束初始埋长大于35mm时,可保证碳纤维束与细粒混凝土有足够的黏结而不被拔出.对于粘细砂处理的绑扎搭接试件,碳纤维搭接长度不小于60mm可满足纤维束间应力传递的要求;在同样的搭接长度下,绑扎搭接纤维束的增强效果要优于黏结搭接.

The pull-out and four-point tests of thin-walled plate specimens were carried out to investigate the bonding and overlapping performance of textile in fine grained concrete. The experimental results show that the warp yarns and the surface treatment of the textile have significant influences on the interfacial bond performance between the textile and the fine grained concrete. In addition, for the textile covered with or without sand, with the increase of the initial bond length of carbon fiber yarn, the average interfa- cial bond strength has a falling trend, and when the initial bond length is longer than 35 ram, it is enough to ensure that carbon fiber yarns can have sufficient bond to the fine grained concrete and can not be pulled out. For the textile covered with fine sand, if the overlapping length of carbon fiber is longer than 60 ram, the requirement for the stress transfer between fiber yarns can be met. At the same overlapping length, the enhancement capacity of the textile using the binding overlapping are better than that of the textile u- sing the sticking overlapping.