Mechanical properties of fiber reinforced panel concrete under high and low temperature cycling
Preventing cracking of panel concrete in pumped storage power plant rockfill dams is an important safeguard to ensure the long-term safe operation of the power plant.In the process of power plant operation,the influence of temperature difference cycling on the durability of panel concrete is usually easy to be ignored.In this paper,polypropylene fiber was added into the panel concrete and an environmental test chamber is used to simulate the high and low temperature cycling within the range of 5～85 ℃ to study the effect of cycling on the mechanical properties of fiber-reinforced panel concrete.The results show that compared to 90 cycles,the compressive strengths of ordinary concrete and polypropylene fiber-reinforced concrete decreased by 29.1％and 26.3％,and the ultimate tensile stresses decreased by 43.1％and 32.5％,respectively,after 450 cycles.The incorporation of polypropylene fibers can significantly reduce the loss of mechanical properties of concrete,and the degree of improvement of tensile properties of concrete by polypropylene fibers is about 5 times of the compressive strength.Polypropylene fibers played a good role in preventing the tensile damage process of concrete under the action of large temperature cycling as a crack-blocking and bridging effect,and the fiber-reinforced concrete showed ductile damage characteristics.
high and low temperature cyclingpanel concretepolypropylene fibersfiber-reinforced concretemechanical properties
万方数据
维普
