特定环境下FRP与混凝土正拉黏结性能试验研究

通过纤维增强塑料(FRP)与混凝土试件的正拉黏结强度试验来研究碳化、冻融循环、盐溶液干湿循环下FRP与混凝土之间的黏结耐久性.碳化、干湿循环作用后,CFRP与GFRP试件的正拉黏结强度有一定提高,表明这两种复合材料体系可以用来加固碳化、盐溶液干湿循环作用地区的混凝土结构.冻融循环作用达到一定循环次数后,正拉黏结强度随着冻融循环次数增加逐渐降低,这与冻融降低了混凝土强度有关,冻融循环对复合材料与混凝土的黏结界面也有不利影响,因此这两种复合材料体系用于加固承受冻融作用的混凝土结构时,需要考虑耐久性问题.

Experimental investigation on normal bonding property between FRP and concrete in special environments

The bond durability between fiber reinforced plastic (FRP) and concrete under carbonization, freeze-thaw cycles and wet-dry cycles in salt water was studied by normal bonding strength experiment of FRP and concrete sample. Normal bonding strength of CFRP and GFRP sample increases after carbonization and wet-dry cycles, so these two kinds of composite system can be used to strengthen concrete structure in regions subjected to carbonization and wet-dry cycles of salt solution. When the action of freeze-thaw cycles achieves a certain times, normal bonding strength decreases with the increase of freeze-thaw cycles times, that because freeze-thaw cycles result in the decrease of concrete strength, and freeze-thaw cycles also have adverse effect on bonding interface between composite and concrete, so durability issue should be taken into account when these two kinds of composite system are used to strengthen concrete structure in regions subjected to freeze-thaw cycles.