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Cement-based composite material and pressure sensor made of same

A pressure-sensitive sensor and composite material technology, applied in the field of graphene oxide and carbon fiber cement-based composite materials and their preparation, can solve the problem of poor resistivity and stress sensing ability, low sensitivity and stable pressure-sensitive sensor of carbon fiber dispersed cement-based composite materials Poor performance and other problems, to achieve the effect of good compactness, high sensitivity and good stability

Active Publication Date: 2015-03-25
BEIJING UNIVERSITY OF CIVIL ENGINEERING AND ARCHITECTURE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problems of poor resistivity and stress sensing ability of cement-based composites caused by uneven dispersion of carbon fibers in the matrix material, poor stability and low sensitivity of pressure-sensitive sensors

Method used

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  • Cement-based composite material and pressure sensor made of same
  • Cement-based composite material and pressure sensor made of same
  • Cement-based composite material and pressure sensor made of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 Preparation of graphene oxide and carbon fiber cement-based composite pressure-sensitive sensor

[0032] Add 1% polycarboxylate superplasticizer by cement mass and 0.03% graphene oxide solution into 200ml water and stir evenly, then add 0.3% cement mass HNO 3The oxidized chopped carbon fiber is fully stirred, and defoaming agent is added to defoam; the uniformly dispersed carbon fiber and cement are poured into a mortar mixer and stirred evenly. During this process, the remaining water and an appropriate amount of water reducer are added to control The consistency and fluidity of the mixture. After mixing evenly, inject 40×40×160mm plastic sand into a standard mechanical test mold (pre-placed with copper wire mesh electrodes), vibrate on a vibrating table for 3 minutes, place it indoors, demould after 1 day, and perform standard maintenance.

Embodiment 2

[0033] Example 2 Preparation of graphene oxide / carbon fiber cement-based composite material pressure-sensitive sensor

[0034] Add 1.2% of cement mass polycarboxylate superplasticizer and 0.1% graphene oxide solution into 200ml water and stir evenly, then add 1% cement mass through HNO 3 Oxidized short-cut carbon fiber, stir well to disperse the carbon fiber evenly, and add defoamer to defoam; pour the uniformly dispersed carbon fiber and cement into the mortar mixer and stir evenly, during this process, add the remaining water and an appropriate amount of Water reducer, control the consistency and fluidity of the mixture. After mixing evenly, inject 40×40×160mm plastic sand into a standard mechanical test mold (pre-placed with copper wire mesh electrodes), vibrate on a vibrating table for 3 minutes, place it indoors, demould after 1 day, and perform standard maintenance.

Embodiment 3

[0035] Example 3 Preparation of graphene oxide and carbon fiber cement-based composite pressure-sensitive sensor

[0036] Add 1.6% of cement mass polycarboxylate superplasticizer and 1% graphene oxide solution into 200ml water and stir evenly, then add 2% cement mass through HNO 3 The oxidized carbon fiber is fully stirred to disperse the carbon fiber evenly, and defoaming agent is added to defoam; the uniformly dispersed carbon fiber and cement are poured into a mortar mixer and stirred evenly. During this process, add the remaining water and an appropriate amount of water agent to control the consistency and fluidity of the mixture. After mixing evenly, inject 40×40×160mm plastic sand into a standard mechanical test mold (pre-placed with copper wire mesh electrodes), vibrate on a vibrating table for 3 minutes, place it indoors, demould after 1 day, and perform standard maintenance.

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Abstract

The invention relates to a cement-based composite material and a pressure sensor made of the same. The problems that the cement-based composite material has poor electrical resistivity and stress sensing ability because carbon fibers are not uniformly dispersed in a matrix, the pressure sensor is poor in stability and low in sensitivity and the like are solved. The graphene oxide / carbon fiber cement-based composite material is composed of functional components, cement, a dispersing agent, a water reducing agent, a defoaming agent, fine aggregates and other mineral admixtures, wherein the functional components include graphene oxide and carbon fibers, graphene oxide accounts for 0.01-5% of the total mass of a cementing material, and the carbon fibers account for 0.01-5% of the total mass of the cementing material. The graphene oxide / carbon fiber cement-based composite material disclosed by the invention has the advantages of high strength, good durability, few porosity defect, good compactness and the like; the pressure sensor has the advantages of stable initial electrical resistivity, high stress sensing ability, high sensitivity, good stability and the like; and the cement-based composite material is superior to a cement-based composite material which only takes the carbon fibers, graphene oxide, carbon black or steel slag and the like as a conductive phase.

Description

【Technical field】 [0001] The invention relates to a composite material and a preparation method thereof, in particular to a graphene oxide and carbon fiber cement-based composite material and a preparation method and application thereof. 【Background technique】 [0002] Concrete is widely used in industrial and civil construction, road and bridge engineering, airports, ports and water conservancy projects. Concrete structure buildings, especially major engineering structures such as super-long-span bridges, key water conservancy projects, key sports venues, large ocean platforms, nuclear power plant projects, and high-speed railway construction, generally have a design life span of decades or even hundreds of years. During the long-term repeated exposure to various loads, long-term erosion of the natural environment such as acid rain, and the aging of the material itself, it will inevitably lead to damage to the civil engineering structure, which may cause sudden disasters an...

Claims

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Application Information

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IPC IPC(8): C04B28/00G01L1/18
Inventor 王琴吕春祥徐末一王健刘伯伟张堃
Owner BEIJING UNIVERSITY OF CIVIL ENGINEERING AND ARCHITECTURE
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