A Caltech Library Service

Experimental Validation of the Attenuation Properties in the Sonic Range of Metaconcrete Containing Two Types of Resonant Inclusions

Briccola, D. and Cuni, M. and De Juli, A. and Ortiz, M. and Pandolfi, A. (2021) Experimental Validation of the Attenuation Properties in the Sonic Range of Metaconcrete Containing Two Types of Resonant Inclusions. Experimental Mechanics, 61 (3). pp. 515-532. ISSN 0014-4851. doi:10.1007/s11340-020-00668-4.

[img] PDF - Published Version
Creative Commons Attribution.


Use this Persistent URL to link to this item:


Background: Metaconcrete is a new concept of concrete, showing marked attenuation properties under impact and blast loading, where traditional aggregates are partially replaced by resonant bi-material inclusions. In a departure from conventional mechanical metamaterials, the inclusions are dispersed randomly as cast in the material. The behavior of metaconcrete at supersonic frequencies has been investigated theoretically and numerically and confirmed experimentally. Objective: The feasibility of metaconcrete to achieve wave attenuation at low frequencies demands further experimental validation. The present study is directed at characterizing dynamically, in the range of the low sonic frequencies, the—possibly synergistic—effect of combinations of different types of inclusions on the attenuation properties of metaconcrete. Methods: Dynamic tests are conducted on cylindrical metaconcrete specimens cast with two types of spherical inclusions, made of a steel core and a polymeric coating. The two inclusions differ in terms of size and coating material: type 1 inclusions are 22 mm diameter with 1.35 mm PDMS coating; type 2 inclusions are 24 mm diameter with 2 mm layer natural rubber coating. Linear frequency sweeps in the low sonic range (< 10 kHz), tuned to numerically estimated inclusion eigenfrequencies, are applied to the specimens through a mechanical actuator. The transmitted waves are recorded by transducers and Fast-Fourier transformed (FFT) to bring the attenuation spectrum of the material into full display. Results: Amplitude reductions of transmitted signals are markedly visible for any metaconcrete specimens in the range of the inclusion resonant frequencies, namely, 3,400-3,500 Hz for the PDMS coating inclusions and near 3,200 Hz for the natural rubber coating inclusions. Specimens with mixed inclusions provide a rather uniform attenuation in a limited range of frequencies, independently of the inclusion density, while specimens with a single inclusion type are effective over larger frequency ranges. With respect to conventional concrete, metaconcrete reduces up to 90% the amplitude of the transmitted signal within the attenuation bands. Conclusions: Relative to conventional concrete, metaconcrete strongly attenuates waves over frequency bands determined by the resonant frequencies of the inclusions. The present dynamical tests conducted in the sonic range of frequencies quantify the attenuation properties of the metaconcrete cast with two types inclusions, providing location, range and intensity of the attenuation bands, which are dependent on the physical-geometric features of the inclusions.

Item Type:Article
Related URLs:
URLURL TypeDescription ReadCube access
Ortiz, M.0000-0001-5877-4824
Pandolfi, A.0000-0002-7084-7456
Additional Information:© The Author(s) 2020. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit Received 09 June 2020; Accepted 22 September 2020; Published 29 October 2020. Open access funding provided by Politecnico di Milano within the CRUI-CARE Agreement. We wish to thank Prof. Maurizio Galimberti of the Departement of Chemistry of the Politenico di Milano for providing the chemical analysis of the coating of the type 1 inclusions. We thank Mr. Marco Cucchi and Mr. Massimo Iscandri for their precious help during the execution of the experiments. Our deepest gratitude goes to Mr. Mario Bergamini and Dr. Andrea Belussi of Isopren Srl (Cusano Milanino, Italy) for supplying the type 2 inclusions and providing their mechanical properties. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Funding AgencyGrant Number
Politecnico di MilanoUNSPECIFIED
Subject Keywords:Metaconcrete; Multiple resonators; Frequency sweep; Transmissibility; Fast fourier transform
Issue or Number:3
Record Number:CaltechAUTHORS:20201102-091525367
Persistent URL:
Official Citation:Briccola, D., Cuni, M., De Juli, A. et al. Experimental Validation of the Attenuation Properties in the Sonic Range of Metaconcrete Containing Two Types of Resonant Inclusions. Exp Mech 61, 515–532 (2021).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106377
Deposited By: Tony Diaz
Deposited On:04 Nov 2020 18:38
Last Modified:14 May 2021 17:35

Repository Staff Only: item control page