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CCCW-mixing graphite smart concrete and application thereof

A concrete and agile technology, applied in the field of concrete, can solve the problem of unstable material agility and other problems, and achieve the effect of improving mechanical properties, good electrical conductivity and improving performance.

Inactive Publication Date: 2012-07-18
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a kind of graphite smart concrete mixed with CCCW, which has stable electrical conductivity and pressure sensitivity, and the manufacturing process is simple, so as to overcome the material defects caused by the lack of existing graphite technology. Unstable issues with alertness

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Preparation of a graphite cement-based composite sensor element doped with CCCW, the size of which is 40mm×40mm×40mm (see figure 1 ). 42.5 ordinary Portland cement is used. Quartz sand for common casting, with a particle size of 0.154mm~0.315mm. The ratio of raw materials and the corresponding resistivity 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 and graphite is expressed as a percentage of the total mass of cement and sand.

[0033] From Table 1, as the graphite content increases, its conductivity is better. When the dosage is about 10%, increasing the graphite content has little effect on the resistivity of the material. The values ​​of graphite and CCCW in Table 1 are percentages of the total mass of cement and sand.

[0034] It can be seen from Table 2 that after adding graphite, the compressive strength of the material decreases. The...

Embodiment 2

[0035] Example 2: The sensor element 40mm×40mm×40mm prepared by the above process and adopts figure 2 The test system shown performs pressure sensitivity testing of materials. Place the sample on the INSTRON 5882 universal material testing machine to form a pressure sensitivity test system to determine the resistance change of the graphite cement mortar test block under cyclic loading. The YE2539 high-speed static strain gauge is simultaneously 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 a cycle of 1 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 the action of cyclic loading, there is a certain corresponding relationship between the resistivity and the stress of the sensing element of different graphite content samp...

Embodiment 3

[0036] Example 3: The sensing element (2% CCCW, 10% graphite content) is encapsulated with epoxy resin and then buried in the center of a column of 100mm×100mm×300mm. The column is prepared according to C30 concrete, such as image 3 Shown. A monotonic pressure load is applied to the column, and the measured resistivity change of the sensing element is as Figure 4 As shown, Figure 4 The three stages of AB, BC and CD correspond to the elastic range, plastic range and failure range of the graphite stress-strain sensor respectively. There is a certain corresponding relationship between resistivity and loading stress, and the repeatability is good. The sensing element can well perceive the force status of the structure. Therefore, the sensor can be widely used in structural health monitoring, vehicle weighing and other engineering fields.

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Abstract

The invention relates to smart concrete, in particular to CCCW-mixing graphite smart concrete formed by adding CCCW concrete mixture and graphite into base materials comprising silicate cement and sand, wherein the mass ratio of cement to sand is 1 to 1; and other components in percentage by weight to the total mass of the cement and the sand are as follows: 1 to 2 percent of CCCW concrete mixture and 5 to 25 percent of graphite. By utilizing the tunneling conducting effect between the contact electric conduction of the graphite and the electric conduction phase, the invention forms the graphite electrical conduction 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 also be used as an industrial anti-static material, an electrical engineering material and an electrothermal material.

Description

Technical field [0001] The invention relates to the technical field of concrete, in particular to graphite smart concrete mixed with CCCW and its application. Background technique [0002] After adding conductive components such as carbon fiber, steel fiber, graphite, etc. to traditional cement-based materials, smart concrete with electrical conductivity, thermoelectric effect, pressure sensitivity and other versatility will be obtained, which is expected to be used in smart buildings and health in the future. It is widely used in many fields such as monitoring and disaster prevention and mitigation. At present, although the preferred additive component for conductive cement-based materials at home and abroad is carbon fiber, the dispersing effect of carbon fiber in cement-based materials is not ideal, resulting in unstable electrical properties and directly affecting the application of such materials. The preparation of graphite conductive cement-based composites does not have ...

Claims

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Application Information

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