Abstract
The use of CFRP (Carbon Fiber Reinforced Polymer) plate to strengthen RC (Reinforced Concrete) structure has become popular, nowadays. Meanwhile, bonding behavior between CFRP plate and concrete is an important issue in application. Many research works had been done to improve the bonding performance of this method. In prior study, it was reported that the bond strength could be increased by increasing the stiffness of CFRP or using a soft adhesive layer with a small shear stiffness. With this assumption, the bond strength will be enhanced by putting a soft layer (polyurea) between CFRP plate and usual adhesive (epoxy). To obtain the complete view of bonding behavior of CFRP plate-concrete, a double face tensile test setup was conducted in this research. Both high modulus type and high tension type of CFRP plate with soft layer and without soft layer were tested. CFRP plate used in this study had a thick of 1mm, 2mm and 4mm, respectively, and had a width of 50mm for all specimens. The results showed that soft layer system has a big influence for high tension type.
Highlights
External bonding of carbon fiber reinforced polymer (CFRP) plate is commonly used for strengthening and retrofitting of both concrete and steel structure
This paper aims to clarify the effect of putting a polyurea soft layer between usual adhesive and concrete
Because of the main objective of this research is to find out the effect of polyurea soft layer, twenty four specimens comprising 1mm and 2mm in thickness for high tension type and 2mm and 4mm in thickness for high modulus type of CFRP plate with soft layer and without soft layer for three specimens each case have been tested in this study
Summary
External bonding of carbon fiber reinforced polymer (CFRP) plate is commonly used for strengthening and retrofitting of both concrete and steel structure. Bonding behavior of plate-concrete interface in producing an effective stress transfer is an important issue in application of this method. A good understanding of the bonding behavior of the CFRP plate and concrete interface has to be developed for the efficient application of this method. Many researchers have been undertaken to understand the bonding behavior of interface between concrete and FRP. Nakaba et al [2] have researched about bond behavior of interface between FRP and concrete and used the Popovic’s equation fitting and apply it to their experiments.
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