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

A technology of damping composite materials and carbon nanotubes, which is applied in solid waste management, sustainable waste treatment, climate sustainability, etc., can solve problems such as uneven dispersion of carbon nanotubes, large data errors, and poor bonding ability, and achieve The test device is simple, low cost, and the effect of improving strength

Inactive Publication Date: 2008-08-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of uneven dispersion of carbon nanotubes in the existing carbon nanotube/cement self-reinforced damping composite material, poor bonding ability between the interface with the matrix, low damping rati

Method used

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

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specific Embodiment approach 1

[0010] Specific Embodiment 1: The preparation of the carbon nanotube / cement self-reinforced damping composite material in this embodiment is realized according to the following steps: 1. The thickening emulsifier is dissolved in deionized water to prepare a continuous phase with a mass concentration of 0.1% to 15%. Solution; 2. Add carbon nanotube dispersant, carbon fiber dispersant, defoamer, acid oxidation-treated carbon nanotubes and oxidized carbon fibers into the continuous phase solution, magnetically stir and then sonicate to form a uniform carbon Nanotube dispersed phase mixed solution; 3. Add cement admixture, deionized water, superplasticizer and cement and polymer latex mixture to the carbon nanotube dispersed phase mixed solution in turn, and then add defoaming 4. Put the carbon nanotube mixed slurry into a test mold and pour it into a mold. After 24 hours, remove the mold and put it in a curing room with a relative humidity of 95±5% and a temperature of 22±3°C. Th...

specific Embodiment approach 2

[0012] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the thickening emulsifier in step one is methyl cellulose, carboxymethyl cellulose, carboxyethyl cellulose, nonylphenol polyoxyethylene ether emulsifier , gum arabic, polyvinylpyrrolidone, polyvinyl alcohol or a mixture of several. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0013] Embodiment 3: This embodiment differs from Embodiment 1 in that in step 1, the thickening emulsifier is dissolved in deionized water to prepare a continuous phase solution with a mass concentration of 0.5-5%. Other steps and parameters are the same as those in Embodiment 1.

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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...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B14/38C04B14/36
CPCC04B28/02C04B20/107C04B14/386C04B14/026Y02W30/91C04B18/08C04B18/141C04B18/146C04B20/008C04B24/005C04B24/26C04B24/2641C04B24/383C04B40/0028C04B40/0281C04B2103/32C04B2103/44C04B2103/50C04B24/003C04B24/2623C04B24/32C04B2103/302C04B24/223C04B24/226C04B24/42C04B20/02C04B20/023C04B2103/0095
Inventor 段忠东罗健林
Owner HARBIN INST OF TECH
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