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Carbon nano-tube fiber cement-based material and preparation thereof

A technology of carbon nanotube fibers and cement-based materials, which is applied in the field of toughening cement-based materials and their preparation, and can solve the problems of low toughness, low bending resistance and low fracture strength.

Inactive Publication Date: 2008-10-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention solves the problems of existing fiber toughened cement-based materials with low bending and fracture strength and low toughness, and provides a carbon nanotube fiber cement-based material and its preparation method

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  • Carbon nano-tube fiber cement-based material and preparation thereof

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specific Embodiment approach 1

[0011] Embodiment 1: In this embodiment, the carbon nanotube fiber cement-based material is made of fiber dispersant, organic solvent, carbon fiber, carbon nanotube, deionized water, superplasticizer, polymer emulsion, mineral admixture and cement wherein the mass ratio of carbon nanotubes to fiber dispersant is 1:0.5-15, the mass ratio of carbon fibers to fiber dispersant is 1:0.1-10, and the mass ratio of carbon nanotubes to carbon fibers is 1:0.5-15 , the mass ratio of deionized water to cement is 0.30~0.80:1, the mass ratio of superplasticizer to cement is 0.005~0.015:1, the mass ratio of polymer emulsion to cement is 0.05~0.20:1, mineral blending The mass ratio of material to cement is 0.05-0.15:1.

specific Embodiment approach 2

[0012] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the fiber dispersant is one of cationic dispersant, anionic dispersant, and nonionic dispersant, or it is a combination of nonionic dispersant and cationic dispersant. A combination of agent and anionic dispersant; cationic dispersant is cetyltrimethylammonium bromide; nonionic dispersant is methyl cellulose, carboxyethyl cellulose, nonylphenol polyoxygen One or a combination of vinyl ether and gum arabic; the anionic type is sodium dodecylbenzenesulfonate and sodium polyacrylate; the organic solvent is absolute ethanol, acetone, tetrahydrofuran (THF), dimethylformamide (DMF), chloroform, ethyl acetate or decalin. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0013] Embodiment 3: This embodiment is different from Embodiment 1 in that the carbon nanotubes are carbon nanotubes with an average diameter of 1 nm to 200 nm and a length of 0.1 μm to 20 μm. Others are the same as in the first embodiment.

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Abstract

The invention relates to a cement-based material of carbon nano tube fiber and a preparation method thereof, in particular to a toughened cement-based material and a preparation method thereof. The invention solves the problems of relatively low anti-bending and anti-breaking intensity and toughness of the existing fiber toughened cement-based material. The material is produced by a fiber dispersant, an organic solvent, carbon fibers, carbon nano tubes, deionized water, a superplasticizer, a polymer emulsion, mineral admixture and cement. The preparation method of the invention is as follows: the fiber dispersant is added into mixed slurry of the cement and stirred; the primarily mixed slurry is fed into a high shearing colloid mill for shearing at high speed for 5 to 30min; the evenly stirred slurry is poured into a test mould which is moved to a vacuum drying case for pressure reducing and bubble-removing and heated for evaporation of the solvent for 0.5 to 3 hours; after 24 hours, and the material is obtained after tearing the mould and maintained in water at room temperature. The fracture energy GF and the fracture toughness of the material obtained by using the method of the invention respectively are 106.3N question mark m and 0.998Mpa / m<-1 / 2>, which are respectively 112.6 percent and 33.1 percent higher than the fracture energy and the fracture toughness of the existing fiber toughened cement-based material.

Description

technical field [0001] The invention relates to a toughened cement-based material and a preparation method thereof. Background technique [0002] With the rapid development of modern society, the brittleness and low toughness of cement materials can no longer meet the requirements for material performance in special occasions such as earthquakes, wind disasters, and complex stresses such as internal temperature stresses in dams. Many scholars try to introduce some high-strength, high-modulus fibers or micropowders into the matrix, such as steel fibers, polymer fibers, carbon fibers, micro-nano silica, etc., to enhance their corresponding bending and fracture toughness. However, the toughening effect is still not significant, and the fracture energy of the correspondingly prepared carbon fiber cement-based composite material is less than 50N·m, and the fracture toughness is less than 0.75MPa / m -1 / 2 . Contents of the invention [0003] The object of the present invention i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B14/38C04B18/14
CPCC04B2201/50C04B28/02
Inventor 段忠东罗健林
Owner HARBIN INST OF TECH
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