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Method for improving Seebeck coefficient of carbon fiber cement-based composite material

A composite material and carbon fiber technology, which is applied in the field of cement-based composite material preparation, can solve the problems of low thermoelectric performance of carbon fiber cement-based composite materials, large environmental pollution risk of bromine vapor, complex process of bromine intercalated carbon fiber, etc., to avoid poor thermoelectric performance High, avoiding the effect of low thermoelectric performance and improving thermoelectric performance

Active Publication Date: 2017-05-31
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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Problems solved by technology

[0007] In order to overcome the shortcomings of the above-mentioned prior art, the object of the present invention is to provide a method for improving the Seebeck coefficient of carbon fiber cement-based composite materials, which solves the complicated process of the existing bromine intercalation carbon fiber and the relatively large risk of environmental pollution caused by bromine vapor. Difficulty in dispersing carbon fiber and low thermoelectric performance of untreated carbon fiber cement-based composites

Method used

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  • Method for improving Seebeck coefficient of carbon fiber cement-based composite material
  • Method for improving Seebeck coefficient of carbon fiber cement-based composite material
  • Method for improving Seebeck coefficient of carbon fiber cement-based composite material

Examples

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Effect test

Embodiment 1

[0026] Prepare a steel mold with a cuboid cavity, and weigh carbon fiber and sulphoaluminate cement without acid treatment according to a mass ratio of 1.2:100.

[0027] The untreated carbon fiber was uniformly dispersed in the cement matrix by using a wheel-type sand mixer, and the uniformly mixed powder was dry-pressed with a steel mold at a pressure of 40Mpa, and then cured to form a carbon fiber cement-based composite material sample.

[0028] A flat heater is used to generate a temperature difference ΔT on the two opposite sides of the carbon fiber cement-based composite sample, one of which is gradually heated to 100°C by the flat heater (heating rate is 0.01°C / s), and the other side is at ambient temperature (Another flat heater heats the ambient temperature at the same heating rate after 10 minutes). During the heating process, the thermoelectric potential ΔV, the temperature difference ΔT and the resistance value generated between the two opposite sides were simultane...

Embodiment 2

[0030] Prepare a steel mold with a cuboid cavity, and weigh acid-treated carbon fiber and sulphoaluminate cement according to a mass ratio of 1.2:100.

[0031] The acid-treated carbon fiber was uniformly dispersed in the cement matrix by using a wheel-type sand mixer, and the uniformly mixed powder was dry-pressed with a steel mold under a pressure of 40Mpa, and cured to form an acid-treated carbon fiber cement-based composite material sample.

[0032] A flat heater is used to generate a temperature difference ΔT between the two opposite sides of the acid-treated carbon fiber cement-based composite sample, one of which is gradually heated to 100°C by the flat heater (heating rate is 0.01°C / s), and the other side is at Ambient temperature (another flat heater heats the ambient temperature at the same heating rate after 10 minutes). During the heating process, the thermoelectric potential ΔV, the temperature difference ΔT and the resistance value generated between the two opposi...

Embodiment 3

[0034] Prepare a steel mold with a cuboid cavity, weigh acid-treated carbon fiber and Portland cement at a mass ratio of 1:100, and add an appropriate amount of aggregate at the same time.

[0035] The acid-treated carbon fiber was uniformly dispersed in the cement matrix by using a wheel-type sand mixer, and the uniformly mixed powder was dry-pressed with a steel mold under a pressure of 60Mpa, and cured to form an acid-treated carbon fiber cement-based composite material sample.

[0036]A flat heater is used to generate a temperature difference ΔT between the two opposite sides of the acid-treated carbon fiber cement-based composite sample, one of which is gradually heated to 100°C by the flat heater (heating rate is 0.01°C / s), and the other side is at Ambient temperature (another flat heater heats the ambient temperature at the same heating rate after 10 minutes). During the heating process, the thermoelectric potential ΔV, the temperature difference ΔT and the resistance v...

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Abstract

The invention discloses a method for improving a Seebeck coefficient of a carbon fiber cement-based composite material. Carbon fibers are subjected to acid treatment in the preparation process of the cement-based composite material and then molded through dry mixing and dry pressing modes. The acid treatment process of the carbon fibers is simple, the specific surface area of the carbon fibers subjected to acid treatment is relatively high, and the contact area between the carbon fibers and a cement matrix can be greatly improved, so that the Seebeck coefficient of the cement-based composite material is significantly improved, and the problem that the composite material is low in thermoelectric property due to use of the carbon fibers which are not subjected to acid treatment is solved. Bromine intercalating process treatment does not need to be carried out on the carbon fibers, so that the problem of environment pollution of bromine vapor is solved. By adopting a dry mixing and dry pressing molding technology, the additive amount of the carbon fibers on the cement matrix can be significantly improved, meanwhile, the carbon fibers can be uniformly dispersed into the cement matrix and the molding pressure intensity is relatively high, so that the thermoelectric property of the composite material is improved, and the problem of relatively low thermoelectric property of the cement-based composite material caused by casting molding is solved.

Description

technical field [0001] The invention belongs to the technical field of preparation of cement-based composite materials, in particular to a method for increasing the Seebeck coefficient of carbon fiber cement-based composite materials. Background technique [0002] Carbon fiber cement-based composites not only have excellent mechanical properties and pressure sensitivity, but also have significant temperature resistance effects, electrothermal and thermoelectric effects, etc. Utilizing the thermoelectric effect of carbon fiber cement-based composite materials, the thermal energy on the surface of concrete materials can be effectively converted into electrical energy, thereby reducing the urban heat island effect. Secondly, in the field of health monitoring of civil engineering structures, strain sensors based on carbon fiber cement-based composite materials with high Seebeck coefficient can greatly improve the sensitivity, reliability and service life of structural health mon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06C04B20/02
CPCC04B20/023C04B28/06C04B14/386C04B14/02
Inventor 魏剑赵莉莉张倩聂证博郝磊
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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