Abstract
Developments in polymer technology have introduced new choices such as using fibers and fiber-reinforced polymers (FRP) to improve the impact behavior of concrete structures. In this research, 52 concrete samples (half of which wrapped with glass fiber-reinforced polymers-GFRP) with different compressive strengths (20, 30, and 40 MPa) and polypropylene fibers were constructed. These samples were subjected to weight dropping (46.7 kg and 66.8 kg). The number of weight droppings related to 30% weight loss was recorded. Results indicated that the impact resistance of the concrete samples, corresponding to the number of weight droppings, increased using higher-strength concrete, higher polypropylene ratios, or GFRP wrapping, separately and in application with each other. However, the effects of GFRP wrapping on the improvement of the impact resistance much higher than those of the polypropylene fibers or concrete strength.
Highlights
During the last 80 years, building construction has been dominated by the use of concrete materials [1]
The results indicated that using Glass fiber-reinforced polymers (GFRP) confinement had a considerable impact on the impact resistance improvement of the samples
Using GFRP wrapping in terms of both the impact resistance improvement and economic considerations was the best choice among using higher-strength concrete or polypropylene fibers
Summary
During the last 80 years, building construction has been dominated by the use of concrete materials [1]. Qin et al analytically investigated the influence of the reinforcement ratio on the flexural performance of hybrid FRP beams using the finite element method [19] They showed that a hybrid reinforcement system consisted of steel bars and FRP improved the ductility and strength of the beams. The impact resistance of polypropylene FRC samples using the Split Hopkinson Pressure Bar (SHPB) device was investigated by Zhang et al [20] They focused on the influences of fiber ratio, water to cement ratio (w/c), and strain rate. It is essential to study the impact behavior of FRC wrapped with GFRP sheets and polypropylene fibers to find suitable strategies to improve the impact resistance of concrete members.
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