Preparation of carbon nano-tube/cement self-enhancing damping composite material damping ratio testing method

Abstract

A method for preparing the carbon nano-tube / cement self-reinforcing amortization composite material and testing the damping ratio, relates to a method for preparing the cement self-reinforcing amortization composite material and testing the damping ratio. The invention settles the problems of nonuniform dispersion of carbon nano-tube, bad binding capability to the substrate interface, low damping ratio and expensive device for testing the damping ratio, complicated test or big data error in the carbon nano-tube / cement self-reinforcing amortization composite material prepared currently. The preparing method comprises the following steps: adding the cement mixing material, deionized water, superplasticiser, and the latex mixture of cement and polymer in sequence into the carbon nano-tube disperse phase miscible liquid for mixing to uniform and eliminating the bubble, afterwards encasing into the specimen mold for molding by casting; removing the mold and standard maintaining to the prescribed lifetime, then the carbon nano-tube / cement self-reinforcing amortization composite material is obtained. The testing method comprises the following procedures: constructing an elastic system, connecting the acceleration gauge and the strength hammer to the data acquisition system, vertically flipping the test piece with the strength hammer and testing the damping ratio.

Description

technical field

[0001] The invention relates to the preparation of cement self-reinforcing damping composite material and the testing method of damping ratio. Background technique

[0002] Today, high stiffness, high strength, and high damping are an important direction for the development of building materials in the future. Cement-based concrete is one of the most widely used traditional building materials, and its strength performance and damping performance are two important mechanical indicators. . At present, various polymers and high-performance reinforcing fibers are added to the cement base material to improve the strength performance and damping performance, but the damping ratio of the obtained material is still low, and the highest damping ratio is 0.055. Carbon nanotubes (CNTs) are the lightest and high-strength hollow multi-wall tubular fibers so far. Its mechanical properties are extremely high. Its tensile strength reaches 50-200GPa, which is 100 times highe...

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