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Structural Engineering and Mechanics Volume 72, Number 3, November10 2019 , pages 305-312 DOI: https://doi.org/10.12989/sem.2019.72.3.305 |
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Utilizing vacuum bagging process to enhance bond strength between FRP sheets and concrete |
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Nisrin R. Abdelal and Mohammad R. Irshidat
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| Abstract | ||
| This paper investigates the effect of utilizing vacuum bagging process to enhance the bond behavior between fiber reinforced polymer (FRP) composites and concrete substrate. Sixty specimens were prepared and tested using double-shear bond test. The effect of various parameters such as vacuum, fiber type, and FRP sheet length and width on the bond strength were investigated. The experimental results revealed that utilizing vacuum leads to improve the bond behavior between FRP composites and concrete. Both the ultimate bond forces and the maximum displacements were enhanced when applying the vacuum which leads to reduction in the amount of FRP materials needed to achieve the required bond strength compared with the un-vacuumed specimens. The efficiency of the enhancement in bond behavior due to vacuum highly depends on the fiber type; using carbon fiber showed higher enhancement in the bond strength compared to the glass fiber when vacuum was applied. On the contrary, specimens with glass fiber showed higher enhancement in the maximum slippage compared to specimens with carbon fibers. Utilizing vacuum does not affect the debonding failure modes but lead to increase in the amount of attached concrete on the surface of the debonded FRP sheet. | ||
| Key Words | ||
| vacuum; bond; concrete; FRP; slippage; fiber | ||
| Address | ||
| Nisrin R. Abdelal: Department of Aeronautical Engineering, Jordan University of Science and Technology, Irbid-Jordan Mohammad R. Irshidat: Department of Civil Engineering, Jordan University of Science and Technology, Irbid- Jordan | ||