Evaluation of mechanical characteristics of polypropylene fiber reinforced concrete at elevated temperature

Abstract

Structures made of fiber-reinforced concrete have been discovered to have increased strength, flexibility, resilience, and permanence. However, there is even little knowledge on the influence of mechanical characteristics when exposed to high temperatures, such as fire. The study's primary goal is to learn about the fundamental behavior of Polypropylene fiber (PPF) when it is exposed to high temperatures. This research aims to see how temperature affects Polypropylene fiber reinforced concrete at temperatures ranging from 27 °C (room temperature) to 600 °C. This paper investigates concrete statistical properties using polypropylene fibers as a support material. Six concrete fiber combinations with a polypropylene fiber limit of 0, 0.20, 0.35, 0.50, 0.75, and1.00%were prepared on a volume basis. A water to cement proportion of 0.4 is provided for all mix proportions. According to the conclusions of the experiments, the mechanical characteristics of concrete are increased by up to 0.5% when polypropylene is present. Compared to conventional concrete, the compressive strength, split tensile strength, and flexural strength of polypropylene concrete are increased by 17 %, 15.58 %, and 7.53 %, respectively. Compared to PPF concrete at room temperature, polypropylene fiber dosages of 0.20, 0.35, and 0.50 % showed 2.87, 3.51, and 4.43 % higher compressive strength at 200 °C. When 0.75 and 1.00 % polypropylene fiber is added, the compressive strength of the concrete is degraded by 3.8 and 4.61 % at 200 °C. Split tensile strength when polypropylene fiber amounts of 0.20, 0.35, and 0.50 % showed 4.47, 5.15, and 6.37 % higher split tensile strength at 200 °C, when polypropylene fiber is added in amounts greater than 0.5 %, such as 0.75 and 1.00 %, the split tensile strength of the concrete declines by 7.00 and 7.31 % at 200 °C. Flexural strength when polypropylene fiber quantities of 0.20, 0.35, and 0.50 % showed 3.76, 4.20, and 5.20 % higher flexural strength at 200 °C.