Experimental Study on Mechanical Properties of Fiber Reinforced Concrete Under Traffic Disturbance Environment

In order to explore the mechanical properties of bridge widening joint materials under vehicle-bridge coupling vibration environment. Based on the reconstruction and expansion project of Shenzhen Airport to He’ao Section of Shenhai Expressway (Ji-He Expressway), this paper first conducts field tests on the vehicle-bridge coupling vibration characteristics of typical bridges, and obtains the maximum vibration velocity of 18 mm/s and the maximum vibration frequency of 5.62 Hz. Then, the conventional vibration environment and limit vibration environment were set, and the mechanical properties of fiber reinforced cement matrix composite 50(FRCM50) at different ages under vibration environment were tested through laboratory tests. The results show that the vibration environment has a certain influence on the mechanical properties of FRCM50, but there is no definite rule. In general, the vibration environment has an adverse effect on the disturbance period, cube compressive strength and flexural strength of FRCM50. It has a beneficial effect on elastic modulus; it has little effect on the splitting tensile strength. Moreover, the vibration environment increases the discreteness of FRCM50 mechanical property test results.