The Experiment Research Of Bonding Property Between Near-surface Mounted CFRP-board And Concrete

CFRP is used to strengthen the concrete structures for abundant advantages that have attracted lot of attention.So this material has a very potent development in the future.Currently,there are two kinds of CFRP reinforcement material for concrete structures strengthening.The first one is CFRP textile with externally bonded reinforcement.The second one is CFRP board with near-surface mounted reinforcement.Especially,near-surface mounted reinforcement techniques can fully utilize its characters and enhance its performance,such as good bonding effect,strong compression resisting and anti-corrosion to fire.So near-surface mounted CFRP board can be used to increase the flexural(bending)of beams and slabs,or the shear capacity of beams.It can also be used for strengthening concrete masonry walls.CFRP textile externally bonded reinforcement is widely used.The technique of near-surface mounted reinforcement for strengthening concrete structures is currently being developed as an alternative to externally bonded CFRP materials.In China,due to this technique is relative new to the developers,and the research of its usage is shortage,but there are some experiments present the performance of near-surface mounted reinforcement for concrete structures strengthening is effected by the bonding property between CFRP and concrete.And this article is intended to research the predominant effects of the CFRP boding property through different reinforcement experiments.In order to enhance the performance of CFRP near-surface mounted reinforcement,this experiment use simple shear tests and control the concrete strength,bond length and different types of binder to find the contributory factors.According to the differences of concrete damage,the bond-slip characteristics and the maximal intension,I summarize the change of CFRP boding property in different contributory situation and how the stress and deformation work in CFRP concrete reinforcement.