Acoustic performance optimization of a cementitious composite with a porous medium. (December 2021)

• Record Type: Journal Article
• Authors: Lin, Sen; Zhang, Genbao; Sun, Junbo; He, Shilin; Chen, Changfu; Morsy, Amr M.; Wang, Xiangyu
• Is Part Of: Journal of building engineering. Volume 44(2021)
• Publication Date: 2021-12
• Subjects: Cementitious composite -- Sound absorption -- Topology optimization -- Bidirectional evolutionary structural optimization (BESO); Building -- Periodicals; 690.05
• DOI: 10.1016/j.jobe.2021.103362
• Languages: English
• ISSNs: 2352-7102

Abstract

Abstract: This paper presents an optimization algorithm for band-gap maximization aimed at designing the porosity of a cementitious composite. Numerical analysis revealed the relationship between the composite porosity and band structure. With the utilization of gravels as the main aggregate, microbeads and a vesicant were also mixed to produce the porous cementitious composite, where correlative experiments were conducted on the mixture proportion. Digital microscope images were applied to evaluate the micro-construction details of the composite. The acoustic performance of the porous concrete was tested by an impedance tube. The results show that the maximum sound absorption coefficient of the phononic crystal composed of 4 mm gravels and surrounding microbeads can reach 90%. The frequency corresponding to the peak value is 1490 Hz, which is consistent with the frequency range of the band gap from theoretical derivation and simulation analysis. This developed methodology is expected to be applied to the design of cementitious structures to achieve sound absorption performance enhancement. Highlights: a nodal sensitivity-based level-set function that is employed to implicitly represent the structural topology. a numerical example revealing that the domain gradually evolves into the optimized topology. the ideal volume fraction of the solid part (V = 0.5) is found for band gap maximization purposes.