Metaconcrete is a new type of concrete made of partially replaced locally resonant engineered aggregates for providing enhanced blast and impact resistance. The engineered aggregate consists of solid core coated with a relatively soft material to activate the resonant behaviours of inclusion at the desired frequencies. The resonant aggregates could trigger the negative effective mass density (NEMD) of the system interacting with the applied dynamic loadings thus attenuate stress wave propagation. This unique attenuation behavior occurs only if the designed resonant frequency of engineered aggregates ( f₀) is within the frequency spectrum of the applied loading. To help design metaconcrete with the desirable attenuation range for structure protection against blast loads, the frequency ranges of different blast scenarios with the scaled distance ranging from 1 m/kg^1/3 to 10 m/kg^1/3 are numerically investigated, the interested frequency range is found up to 50 kHz. In this study, the tunable properties of metaconcrete containing various aggregate configurations are numerically investigated by using finite element software COMSOL Multiphysics. The numerical model is calibrated first by using the results from a previous study on three-dimensional locally resonant metamaterial. With the calibrated numerical model, the frequency ranges of the NEMD of metaconcrete containing engineered aggregates in four geometric shapes are analysed. The effect of the parameters such as the aggregate shape, size, volume fraction, and material properties on the region of the NEMD are investigated. The sensitivity of the factors influencing the region of the NEMD is evaluated and discussed. The results can be used for designing engineered aggregates for better structural protections.

超混凝土是一种新型的混凝土，由部分替代的局部共振工程集料制成，可提供增强的抗爆炸性和抗冲击性。工程集料由包覆有相对较软材料的实心核组成，以在所需频率下激活夹杂物的共振行为。共振聚集体可以触发系统的负有效质量密度（NEMD），与施加的动态载荷相互作用，从而减弱应力波的传播。仅当工程骨料的设计共振频率（  f ₀）在所施加负载的频谱内。为了帮助设计具有理想衰减范围的超混凝土，以保护结构免受爆炸载荷的影响，对数值范围为1 m / kg ^1/3到10 m / kg ^1/3的不同爆炸场景的频率范围进行了数值研究，频率范围高达50 kHz。在这项研究中，通过使用有限元软件COMSOL Multiphysics数值研究了包含各种骨料构型的超混凝土的可调谐特性。。首先使用先前对三维局部共振超材料的研究结果对数值模型进行校准。利用标定的数值模型，分析了包含四种几何形状的工程骨料的超混凝土的NEMD频率范围。研究了诸如聚集体形状，尺寸，体积分数和材料特性等参数对NEMD区域的影响。评估和讨论了影响NEMD区域的因素的敏感性。结果可用于设计工程骨料以提供更好的结构保护。