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Method for preparing carbon fiber cement based composite through dry mixing and dry pressing

A composite material and carbon fiber technology, which is applied in the field of carbon fiber cement-based composite material preparation, can solve the problems of lack of quantitative parameters in the pressing process and reduce the bonding strength of hydration products, so as to avoid the reduction of electrical conductivity, reduce porosity, and uniform carbon fiber distribution Effect

Active Publication Date: 2016-08-24
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sulfoaluminate cement will hydrate rapidly after mixing with water, reducing the bonding strength between hydration products, and the control of parameters in the pressing process is lack of quantification

Method used

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  • Method for preparing carbon fiber cement based composite through dry mixing and dry pressing
  • Method for preparing carbon fiber cement based composite through dry mixing and dry pressing
  • Method for preparing carbon fiber cement based composite through dry mixing and dry pressing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Prepare a steel mold, and weigh PAN-based chopped carbon fiber and sulphoaluminate cement according to the mass ratio of 1:100.

[0029] Use a mortar mixer to pre-disperse the chopped carbon fibers, first stir at a low speed for 5 minutes, and then stir at a high speed for 5 minutes to make it into a monofilament. Put the pre-dispersed chopped carbon fiber and sulphoaluminate cement in the roller sand mixer and mix them for 20 minutes in sequence according to the proportion. Finally, it was dry-pressed at a pressure of 50 MPa to form a carbon fiber cement-based composite material sample, which was cured in water until it was completely hardened.

Embodiment 2

[0031] Prepare a steel mold, and weigh PAN-based chopped carbon fiber and sulphoaluminate cement according to the mass ratio of 1:100.

[0032] Use a mortar mixer to pre-disperse the chopped carbon fibers, first stir at a low speed for 5 minutes, and then stir at a high speed for 5 minutes to make it into a monofilament. Put the pre-dispersed chopped carbon fiber and sulphoaluminate cement in a roller sand mixer and mix them for 25 minutes in sequence according to the proportion. Finally, it was dry-pressed at a pressure of 50 MPa to form a carbon fiber cement-based composite material sample, which was cured in water until it was completely hardened.

Embodiment 3

[0034] Prepare a steel mold, and weigh PAN-based chopped carbon fiber and sulphoaluminate cement according to the mass ratio of 1:100.

[0035] Use a mortar mixer to pre-disperse the chopped carbon fibers, first stir at a low speed for 5 minutes, and then stir at a high speed for 5 minutes to make it into a monofilament. Put the pre-dispersed chopped carbon fiber and sulphoaluminate cement in the roller sand mixer and mix them for 20 minutes in sequence according to the proportion. Finally, it was formed by dry pressing at a pressure of 60MPa to form a carbon fiber cement-based composite material sample, which was cured in water until it was completely hardened.

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Abstract

The invention discloses a method for preparing a carbon fiber cement based composite through dry mixing and dry pressing. According to the method, firstly, short carbon fibers are pre-dispersed in a form of monofilaments and then dry-mixed uniformly with other raw materials, and the mixture is directly subjected to dry pressing forming and maintenance, wherein the short carbon fibers can be PAN-based fibers, pitch-based fibers or viscose-based fibers and have the length of 5-10 mm. A method of co-doping of the short carbon fibers and sulfate aluminum cement is used, the short carbon fibers are firstly pre-dispersed in the form of the monofilaments by a mortar stirrer before mixing and then mixed with other raw materials in a grinding wheel type sand mixer, and finally, the mixed raw materials are directly pressed, formed and maintained in water until the raw materials are completely hardened. According to the method, the carbon fibers are uniformly distributed without addition of a dispersion agent, a defoaming agent and a water reducer, the porosity of a cement matrix is reduced, the condition that the conductivity of a carbon fiber cement based composite is reduced due to addition of a cellulose dispersing agent can be avoided, and the problem that the cement matrix bonding strength is reduced due to rapid hardening of the sulfate aluminum cement during pressing forming after blending of cement and water is solved.

Description

technical field [0001] The invention belongs to the technical field of preparation of carbon fiber cement-based composite materials, in particular to a method for preparing carbon fiber cement-based composite materials by dry mixing and dry pressing. Background technique [0002] Carbon fiber cement-based composites mainly disperse chopped carbon fibers evenly in the cement matrix, which can not only improve the crack resistance, shear strength, elastic modulus, and ability to control surface crack propagation of cement-based materials, but also improve electrical properties. Significant improvement. Studies have found that carbon fiber cement-based composites have pressure sensitivity, Seebeck effect and electrothermal effect, and are a sensitive material. Using pressure sensitivity, it can diagnose its own stress state and damage degree, which can be used for traffic monitoring; using Seebeck effect and electrothermal effect, it can self-diagnose and adaptively control th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B28/06C04B20/02
CPCC04B20/02C04B28/04C04B28/06C04B14/386C04B14/00C04B20/0068
Inventor 魏剑张倩赵莉莉聂证博
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY