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High ductility cement base strain transducer

A strain sensor, cement-based technology, applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measurement devices, etc., can solve the problems of small tensile strain range and difficulty in meeting engineering needs, etc., achieve large range, simple external equipment, and wide application Effect

Inactive Publication Date: 2016-03-02
WUHAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a high-ductility cement-based strain sensor (hereinafter referred to as HDCSS) for the existing cement-based strain sensor, which has a relatively small measuring range for detecting tensile strain and is difficult to meet engineering needs. Can be used to detect compressive strain and tensile strain in concrete structures

Method used

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Examples

Experimental program
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specific Embodiment 1

[0053] The mass ratio of selected raw materials is: cement: fly ash: sand: water: polyvinyl alcohol fiber: GnPs: polycarboxylate water reducer: viscosity modifier = 1: 2.0: 1.35: 0.93: 0.067: 0.034: 0.033: 0.00076 . The selected GnPs (produced by XG Sciences Company in the United States) is in the form of flakes, with a particle size (D50) of 5 μm, a sheet thickness of 6-8nm, and a specific surface area of ​​120-150m 2 / g. GnPs have a conductivity of 10 7 S / m (parallel sheet direction) and 10 2 S / m (thickness direction). The polyvinyl alcohol fiber is produced by Anhui Wanwei High-tech Materials Co., Ltd. The fiber diameter is 35 μm, the length is 12 mm, the elastic modulus is 39.4 GPa, and the tensile strength is 1092 MPa. Ordinary Portland cement (brand P.O42.5) produced by Hubei Huaxin Cement Co., Ltd. and Class I fly ash from Wuhan Yangluo Power Plant were used. The polycarboxylate superplasticizer is ADVA152, produced by American Grace China Co., Ltd. The viscosity ...

specific Embodiment 2

[0057] The material ratio and material parameters are the same as in Example 1, and a HDCSS with a cross-sectional size of 40mm×40mm and a height of 160mm is made, and the compressive strain and ΔR / R 0 Relationship. When compressing, place the HDCSS along the height direction, level the upper and lower surfaces of the HDCSS with superhard quick-drying gypsum, and fix the precision LVDT displacement gauge in the area where the two measuring electrodes are located to measure the compressive strain. The obtained compressive strain and ΔR / R 0 relationship curve as Image 6 As shown, the specific expression of the piecewise function in formula (3) at this time is:

[0058]

[0059] When detecting compressive strain, R x Decreases with increasing absolute value of strain, ΔR / R 0 is a negative number, that is, compressive strain and ΔR / R 0 Both are negative. The range of HDCSS measuring compressive strain is -0.0023~0 (ie -0.23%~0).

[0060] Combining formulas (5) and (6) i...

specific Embodiment 3

[0067] Change the dosage of GnPs, and the ratio of materials is shown in Table 1. Material parameters, preparation method and test method are the same as in Example 1. The volume dosages of GnPs corresponding to A1-A6 in Table 1 are 0.2%, 0.4%, 0.6%, 0.8%, 1.0%, and 1.2%, respectively. Wherein, A3 is the proportioning that embodiment 1 adopts. When the volume dosage of GnPs is greater than 1.2%, it is difficult for GnPs to disperse uniformly. Table 2 shows the measured sensitivity of HDCSS prepared with different dosages of GnPs, and piecewise functions similar to formulas (5) and (6) can also be obtained. The sensing range of tensile strain of various HDCSS is above 3.0%.

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Abstract

The invention discloses a high ductility cement base strain transducer, composed of sensitive materials, electrodes embedded in the sensitive materials, and stranded copper conductors. Four sheets of electrodes are provided, wherein two sheets are power supply electrodes and the other two sheets are measuring electrodes located between the power supply electrodes; one end of the stranded copper conductors is lead out from a same position, and the other end is stripped to expose copper wires; the copper wires are winded on the four sheets of electrodes. The high ductility cement base strain transducer possesses the advantages of high stretching ductility, large detection drawing stain measuring range, simple external equipment, and wide application scope, and can detect drawing and pressing strain.

Description

technical field [0001] The invention relates to the field of intelligent concrete, in particular to a high-ductility cement-based strain sensor that is reinforced by mixing nanometer graphene sheets (GnPs) and polyvinyl alcohol (PVA) fibers. Background technique [0002] Concrete has rich sources of raw materials, low cost, convenient construction, excellent strength and durability, and has been widely used in construction projects. With the development of large-scale and intelligent concrete structures today, the cement concrete material itself has a tendency to develop towards the integration of structure and intelligence. Cement-based intelligent composite materials are the key supporting materials to realize the intelligentization of civil engineering structures. Cement-based intelligent composite materials are not only not inferior to ordinary concrete in terms of performance, but also have self-sensing ability to strain. Cement concrete itself has poor conductivity, ...

Claims

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Application Information

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IPC IPC(8): G01B7/16
CPCG01B7/18
Inventor 孙明清胡继洪宋鹏飞宋建华崔友国宋建国严兆顺李俊刘衡李卓球张小玉
Owner WUHAN UNIV OF TECH
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