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CCCW-mixing graphite smart concrete and application thereof

A concrete and smart technology, which is applied in the field of concrete, can solve the problems of unstable material smart properties, etc., and achieve the effect of improving mechanical properties, good electrical conductivity, and good electrical conductivity

Inactive Publication Date: 2009-12-16
WUHAN UNIV OF TECH
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  • 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 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

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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

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Experimental program
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Embodiment 1

[0032] Embodiment 1: prepare the 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 corresponding resistivity after curing for 28 days 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 represented by its percentage of the total mass of cement and sand.

[0033] Known from Table 1, with the increase of graphite content, the better the conductivity. 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 the percentages of the total mass of cement and sand.

[0034] It can be seen from Table 2 that after adding graphite, the compressive str...

Embodiment 2

[0035] 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

[0036] Embodiment 3: Embed the sensor element (2% CCCW, 10% graphite content) into the column center of 100mm * 100mm * 300mm after adopting epoxy resin encapsulation, the column is prepared by C30 concrete, as image 3 shown. A monotonic pressure load is applied to the column, and the measured resistivity change of the sensing element is as follows: Figure 4 as shown, Figure 4 The three stages 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 condition of the structure, so the sensor can be widely used in engineering fields such as structural health monitoring and vehicle weighing.

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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, and graphite to traditional cement-based materials, smart concrete with multiple functions such as electrical conductivity, thermoelectric effect, and pressure sensitivity can be obtained. It is widely used in many fields such as monitoring and disaster prevention and mitigation. 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 graphite conductive cement-based composite materials, but in order to obtain stable co...

Claims

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Application Information

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Patent Type & Authority Applications(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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