Dispersion layer composite damping material with vacant-shell foam ceramic balls as aggregate

Abstract

The invention belongs to the technical field of national defense engineering protection materials, and especially relates to a dispersion layer composite damping material with vacant-shell foam ceramic balls as aggregate and with a civil air defense command work layered structure. The purpose of the invention is to use a dispersion layer material with large attenuation coefficient, high cost performance and stable performances to substitute sandy soil and other local materials used at present in order to improve the comprehensive protection ability of the layered protection structure. The dispersion layer material is prepared through mixing the vacant-shell foam ceramic balls, highly adhesive and elastic asphalt base and polyphenyl particles according to a certain ratio, and through carrying out compression molding, wherein the vacant-shell foam ceramic balls are a hollow foam ceramic structure, and have the characteristics of high amount of porosity and small density. The cavity diffraction and foam compression destroy energy dissipation of the vacant-shell foam material and the intrinsic damping of the highly adhesive and elastic asphalt base are fully used in the invention, so the attenuation coefficient of the prepared dispersion layer material is 4.2, the density is 0.85g / cm<3>, the wave velocity is 120m / s, and the comprehensive protection ability of the civil air defense command engineering layered structure is greatly improved.

Description

technical field [0001] The invention belongs to the field of protective materials for national defense projects, in particular to a dispersed layer composite damping material with a layered structure of a civil defense command project, which uses hollow-shell foam ceramic balls as aggregates. Background technique [0002] Setting sand and soil as the functional unit of the dispersion layer between the bullet-shielding layer and the enclosure structure has always been an important anti-blast measure for civil air defense command projects, and has the characteristics of convenient material acquisition, low price, and simple construction. However, in the long-term use process It is found that there are two shortcomings: (1) the attenuation coefficient drops significantly after water absorption or hardening, and some data show that the attenuation coefficient of dry and loose sand is 3.25, while the attenuation coefficient of sand after water absorption is 2.5; (2) The attenuati...

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Problems solved by technology

[0002] Setting sand and soil as the functional unit of the dispersion layer between the bullet-shielding layer and the enclosure structure has always been an important anti-blast measure for civil air defense command projects, and has the characteristics of convenient material acquisition, low price, and simple construction. However, in the long-term use process It is found that there are two shortcomings: (1) the attenuation coefficient drops significantly after water absorption or hardening, and some data show that the attenuation coefficient of dry and loose sand is 3.25, while the attenuation coefficient of sand after water absorption is 2.5; (2) The attenuation mechanism only includes high-frequency collision friction of bulk materials, the method is relatively simple, and the efficiency is relatively low; (3) easy to collapse, harden, etc.

Research on the absorption capacity of polyethylene aggregate concrete, foam glass, polyurethane foam and other materials for ground shock stress waves at the U.S. Army Waterway Experiment Station found that the modulus of such materials does not match the strength of ground shock stress waves; domestic Tang Degao researched The anti-explosion and energy-absorbing ability of foam concrete as backfill material for underground tunnels; Zhao Kai et al. studied the attenuation and dispersion of foam concrete as a layered structure dispersion layer on explosion waves, but found that foam concrete is also easy to absorb water after actual use. Saturation, so performance drops drastically

The thin-walled shell structure as a buffer and energy-absorbing element is a new idea in protection design in recent years. Round tubes, rings, and spherical shells are all limited absorbing elements, but they are currently limited to laboratory test models, and it is difficult to extend them to larger scales. The protective structure design of the ruler

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