CCCW-mixing carbon fiber graphite smart concrete and application thereof

A CCCW and concrete technology, applied in the field of concrete, can solve the problems of unstable electrical conductivity and sensitive properties, insufficient dispersion process, etc., and achieve the effects of reducing polarization effects, improving microstructure, low resistivity and pressure-sensitive stability

Inactive Publication Date: 2009-12-16
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a carbon fiber graphi

Method used

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  • CCCW-mixing carbon fiber graphite smart concrete and application thereof
  • CCCW-mixing carbon fiber graphite smart concrete and application thereof
  • CCCW-mixing carbon fiber graphite smart concrete and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: prepare the carbon fiber graphite cement-based composite material sensing element that mixes CCCW inside, its size is 40mm * 40mm * 40mm (see figure 1). Use 42.5 ordinary Portland cement. Quartz sand for ordinary casting, with a particle size of 0.154mm to 0.315mm. The ratio of raw materials and the resistivity of the corresponding test blocks after 28 days of curing are shown in Table 1. The effect of adding CCCW on the compressive strength of the material is shown in Table 2. The ratio of CCCW material, carbon fiber, graphite, carbon fiber dispersant and defoamer is represented by the percentage of the total mass of cement and sand.

[0031] It is known from Table 1 that under the condition of a certain amount of carbon fiber added, as the amount of graphite increases, the conductivity becomes better. When the dosage is about 10%, increasing the graphite content has little effect on the resistivity of the material. The values ​​of carbon fiber, grap...

Embodiment 2

[0033] Embodiment 2: The sensor element 40mm * 40mm * 40mm prepared by the above process, and adopt figure 2 The test system shown performs pressure sensitivity testing of materials. Put the sample on the INSTRON 5882 universal material testing machine to form a pressure-sensitive test system to measure the resistance change of the graphite cement mortar test block under cyclic loading. Simultaneously, the YE2539 high-speed static strain gauge is used to record the strain value of the sample during loading. The loading method is triangular wave cyclic loading, and the loading and unloading rate is controlled as one cycle per minute. The maximum compressive stress is 6.25MPa, and the piezoresistive characteristics of the sample are studied for 5 cycles, and the strain sensitivity coefficient is analyzed. Under cyclic loading, there is a certain correspondence between the resistivity and stress of the sensing element of samples with different graphite content. When the graph...

Embodiment 3

[0034] Embodiment 3: will figure 1 The sensing element shown is 40mm×40mm×40mm (2% CCCW, 0.5% carbon fiber, 10% graphite content) encapsulated with epoxy resin, and embedded in the center of a 100mm×100mm×300mm short column. The column is prepared according to C30 concrete, such as image 3 shown. A cyclic pressure load is applied to the column, the loading system and the measured resistivity change of the sensing element are as follows: Figure 4 As shown, there is a certain corresponding relationship between resistivity and loading stress, and the repeatability is good. When the pressure is monotonously loaded on the column, the relationship between resistivity and compressive stress is as follows: Figure 5 shown. The sensing element can sense the force condition of the structure very well, Figure 5 The three stages AB, BC and CD correspond to the elastic range, plastic range and failure range of the carbon fiber graphite stress-strain sensor, respectively. Therefore,...

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Abstract

The invention relates to smart concrete, in particular to carbon fiber graphite smart concrete formed by adding CCCW concrete mixture and carbon-fiber-graphite mixing electric conduction phase into base materials comprising silicate cement and sand, wherein the mass ratio of cement to sand is 1 to 1; and the percentage of other components corresponding to the total mass of the cement and the sand: 1 to 2 percent of CCCW concrete mixture, 0.3 to 0.5 percent of carbon fiber, 5 to 25 percent of graphite, 0.1 to 0.2 percent of dispersing agent and 0.01 to 0.015 percent of antifoaming agent. By utilizing the tunneling conducting effect between the contact electric conduction of chopped carbon fiber and graphite and the electric conduction phase, the invention forms the electrically conductive concrete with smart property, and has the advantages of favorable electric conduction, high mechanical property, stable electrical conductivity and pressure-sensitivity, simple preparation, lower price, and the like; and the material can be utilized for manufacturing a concrete structure sensor element, can be used for the effective execution of the health supervision of the concrete structure and can be used for weighing cars, etc.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to carbon fiber graphite smart concrete mixed with CCCW. Background technique [0002] After traditional cement-based materials are added with conductive components such as carbon fibers, steel fibers, and graphite, they will have electrical conductivity and multi-functionality (including Joule effect, thermoelectric effect, pressure sensitivity, and force sensitivity, etc.), which are expected to be used in future smart buildings. , health monitoring, disaster prevention and mitigation and other fields are widely used. At present, although carbon fiber is the preferred additive component for conductive cement-based materials at home and abroad, the dispersion effect of carbon fiber in cement-based materials is not ideal, resulting in unstable electrical properties, which directly affects the application of such materials. There is no dispersion problem in the preparation of graph...

Claims

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Application Information

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IPC IPC(8): C04B28/04G01B7/16G01L1/22G01G3/14G01G19/02C04B14/06C04B14/38
Inventor 范晓明李卓球孙明清
Owner WUHAN UNIV OF TECH
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