Study on the Impact Resistance of PVA Fiber Reinforced Waste Glass Powder Concrete

Under impact loading, the fatigue life of waste glass powder concrete is lower than that of ordinary concrete. To enhance the impact resistance of waste glass powder concrete, renewable polyvinyl alcohol (PVA) fibers are introduced. Considering the effects of PVA fiber volume content (0.4%, 0.8%, 1.2%) and fiber length (6 mm, 12 mm, 18 mm), the basic mechanical properties and impact resistance of PVA fiber-reinforced waste glass powder concrete are investigated through compression tests, flexural tests, and drop hammer impact tests. The results show that the incorporation of PVA fibers can effectively improve the impact resistance of waste glass powder concrete, and both the compressive and flexural strength are enhanced to varying degrees. The specimen with 0.8% fiber content exhibits the best strength, and short fibers perform better than long fibers. There is a positive correlation between the impact resistance of the specimens and the fiber content: as the content of PVA fibers increases, both the initial crack impact number N1 and the failure impact number N2 show an increasing trend, and the energy absorbed by the concrete during initial cracking and failure gradually increases. The optimum impact energy absorption is achieved with the incorporation of 1.2% 6 mm fibers. Based on the experimental results, a functional relationship between fiber length, fiber content, and impact energy absorption is proposed for PVA fiber-reinforced waste glass powder concrete.