Pull-out Strength of Expansion Anchor Bolt Embedded in Polypropylene Fiber Reinforced Concrete

Concrete is a well-known composite material valued for its high compressive resistance. Its most significant disadvantage is having a deficient tensile strength that causes the development and propagation of cracks—these properties of concrete limit its application with tensile stresses. To improve concrete's tensile strength, durability, and mechanical behavior, uniformly distributing fibers throughout its volume is now widespread and referred to as fiber-reinforced concrete. The study examined how the addition of polypropylene fibers influences the pull-out strength of expansion anchor bolts in concrete. An investigation into the influence of fiber content (0%, 0.1%, 0.2%, and 0.3%) on the material's resistance to splitting, compression, and pull-out was conducted. 56 cylindrical samples were tested for split tensile and compression tests, while 24 rectangular samples were tested for the pullout test. The inclusion of polypropylene fiber reinforcement led to significant enhancements in the splitting strength, compressive strength, and pull-out strength of concrete.