Optimization Testing of Vibration Reduction Performance of Phononic-Like Crystal Metaconcrete Material

The phononic-like crystal (PLC) metaconcrete material with vibration reduction performance, proposed by the authors based on local resonance metamaterials, provides a new technology for solving low-frequency vibration problems in civil engineering, and has broad application value and prospects in the field of low-frequency vibration control. However, if the existing PLC metaconcrete material achieves better vibration reduction effect, its compressive strength will decrease. Therefore, in response to this deficiency, this paper conducts optimization tests on existing PLC metaconcrete material, aiming to improve the vibration reduction effect while ensuring that the PLC metaconcrete material has a high strength grade. Firstly, the mix proportions of existing PLC metaconcrete were optimized through indoor tests, and a PLC metaconcrete material with polymer particle contents of 16%, 18%, and 20% was prepared. Secondly, vibration tests were conducted on PLC metaconcrete with different polymer particle contents to analyze the vibration reduction effect. Finally, the optimized PLC metaconcrete material was used to prepare a PLC metaconcrete subway track bed slab for analyzing its vibration reduction effect in practical engineering, which can provide a basis for promoting the use of optimized PLC metaconcrete material in practical engineering in the future. The results showed that the optimized PLC metaconcrete material with polymer particle contents of 16%, 18%, and 20% not only ensures C50 strength grade, but also has better vibration reduction performance than the existing PLC metaconcrete, successfully making up for the existing PLC metaconcrete not being able to have a higher strength grade and better vibration reduction effect at the same time. Among them, the maximum vibration reduction effect of the PLC metaconcrete material with polymer particle contents of 16%, 18% and 20% increased by 1.78, 4.12, and 7.62 dB, respectively, compared with the existing PLC metaconcrete material. Moreover, the optimized PLC metaconcrete material prepared PLC metaconcrete subway track bed slab increased the maximum vibration reduction effect and average vibration reduction effect by 2.05 and 3.14 dB, respectively, compared with the existing PLC metaconcrete material prepared PLC metaconcrete subway track bed slab.