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A method for preparing carbon fiber cement-based composite materials by 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 reducing the bonding strength of hydration products and lack of quantification of parameters in the pressing process, so as to avoid the reduction of electrical conductivity, reduce porosity, and uniform distribution of carbon fibers. Effect

Active Publication Date: 2017-11-24
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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  • A method for preparing carbon fiber cement-based composite materials by dry mixing and dry pressing
  • A method for preparing carbon fiber cement-based composite materials by dry mixing and dry pressing
  • A method for preparing carbon fiber cement-based composite materials by 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

A method for dry-mixing and dry-pressing carbon fiber cement-based composite materials. Firstly, chopped carbon fibers are pre-dispersed into monofilaments, and then dry-mixed with other raw materials and directly dry-pressed to shape, and then cured. The chopped carbon fibers can be It is PAN-based, asphalt-based or viscose-based, and the length of chopped carbon fiber is 5-10mm. The present invention uses the method of blending chopped carbon fiber and sulfoaluminate cement, but before mixing the chopped carbon fiber with a mortar mixer Pre-dispersed into monofilaments, and then mixed with other raw materials in a wheel-type sand mixer, and finally the mixed raw materials are directly pressed into shape and cured in water until completely hardened; this method distributes carbon fibers evenly and does not need to add dispersants , defoaming agent and water reducing agent, reduce the porosity of cement matrix, and can avoid the reduction of electrical conductivity of carbon fiber cement-based composite materials caused by adding cellulose dispersant, and avoid the loss of sulfoaluminate cement when the cement is mixed with water and pressed into shape Rapid hardening reduces the bond strength of the cement matrix.

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 Patents(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