CN102879120A - Method for monitoring composite material engineering temperature - Google Patents
Method for monitoring composite material engineering temperature Download PDFInfo
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- CN102879120A CN102879120A CN201110194645XA CN201110194645A CN102879120A CN 102879120 A CN102879120 A CN 102879120A CN 201110194645X A CN201110194645X A CN 201110194645XA CN 201110194645 A CN201110194645 A CN 201110194645A CN 102879120 A CN102879120 A CN 102879120A
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- temperature sensor
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- carbon black
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- 239000002131 composite material Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000012544 monitoring process Methods 0.000 title claims abstract description 19
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 39
- 239000004917 carbon fiber Substances 0.000 claims abstract description 39
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000004567 concrete Substances 0.000 claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 239000006229 carbon black Substances 0.000 claims description 33
- 239000000463 material Substances 0.000 claims description 8
- 239000004814 polyurethane Substances 0.000 claims description 8
- 229920002635 polyurethane Polymers 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 241000872198 Serjania polyphylla Species 0.000 claims description 3
- 239000004568 cement Substances 0.000 abstract description 7
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 229910001220 stainless steel Inorganic materials 0.000 abstract 1
- 239000010935 stainless steel Substances 0.000 abstract 1
- 229910021392 nanocarbon Inorganic materials 0.000 description 10
- 238000012360 testing method Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 230000004224 protection Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000007774 longterm Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000013530 defoamer Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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Abstract
The invention discloses a method for monitoring a composite material engineering temperature. The method comprises the following steps: i, manufacturing a temperature sensor original (2) via the way of embedding four stainless steel network electrodes; ii, mounting an L-shaped deployable concrete structure (3) outside the manufactured temperature sensor original (2); iii, inserting the L-shaped deployable concrete structure (3) of the temperature sensor original (2) into the part of a large volume concrete structure (1) needing measuring the temperature; iv, exciting the sensor original (2) by a constant voltage source (5); v, using a high temperature resistent wire (4) of the temperature sensor original (2) to transmit the voltage and electric current to a signal amplifier (6); vi, using a data acquisition card (7) of a computer (8) to amplify voltage and electric current signals; and vii, obtaining the temperature value of the part to be measured by a mathematical operation and calibration temperature-resistance conversion formula. With the adoption of the method for monitoring the composite material engineering temperature, the temperature detection sensitivity of carbon fiber cement based composite material temperature sensor can be improved.
Description
Technical field
The invention belongs to civil engineering work, Hydraulic and Hydro-Power Engineering and traffic engineering technical field, relate to the temperature monitoring method in a kind of engineering site long term monitoring field, relate in particular to a kind of carbon fiber/nanometer carbon black cement-base composite material engineering temperature method of real-time.
Background technology
In engineering site detected, the monitoring of large volume concrete structural basal temperature in the construction time process restricted accuracy and the precision of data greatly for rationally solving temperature stress and controlling play an important role traditional thermometer, thermocouple etc. of crack developing as traditional detection means of sensor.Though advanced fiber-optical grating temperature sensor has the advantages such as high, corrosion-resistant, the anti-electromagnetic interference (EMI) of volume sluggishness, transmission band be wider, but its fancy price hinders it to be used widely, the variation of its temperature of electrical resistance of Carbon Fiber Cement-based Composites and reversible variation, cheap, be easy to carry out distributed measurement, be applicable to on-the-spot Long Period Health Monitoring.But because the resistance of Carbon Fiber Cement-based Composites is subject to many-sided impacts such as stress, humidity, the length of time, cause measurement result that very large uncertainty is arranged, be very restricted in actual applications.
Directly adopt multimeter to measure the resistance of Carbon Fiber Cement-based Composites in the lot of documents, and by overall electrical resistance to recently analysis temperature and resistance or resistance variations the relationship between quantities, have a test unit simple, the advantage such as test result is directly perceived.But because that the resistance change that causes of temperature is compared with matrix resistance is still smaller, so the said method precision is not high.
Summary of the invention
The purpose of this invention is to provide a kind ofly be applicable to the engineering site long term monitoring, stability is high, precision is high, the scope of application is extensive, realize the multifactor carbon fiber of avoiding/nanometer carbon black cement-base composite material engineering temperature monitoring method, to remedy current Carbon Fiber Cement-based Composites deficiency aspect the temperature monitoring in practical engineering application.
Technical scheme of the present invention is:
A kind of composite material engineering temperature monitoring method may further comprise the steps:
ⅰ at first makes carbon fiber/nanometer carbon black cement-base composite material engineering temperature sensor original paper by chopped carbon fiber and nanometer carbon black with the method for burying four stainless (steel) wire electrodes underground;
Secondly ⅱ can open xoncrete structure with the carbon fiber that makes/outside L-type of installing of nanometer carbon black cement-base composite material engineering temperature sensor original paper;
ⅲ will be provided with the L-type of carbon fiber/nanometer carbon black cement-base composite material engineering temperature sensor original paper can open xoncrete structure embeds needs to measure temperature in the large volume concrete structural position;
ⅳ adopts constant pressure source to encourage carbon fiber/nanometer carbon black cement-base composite material sensor original paper;
ⅴ carbon fiber/nanometer carbon black cement-base composite material engineering temperature sensor original paper adopts high temperature resistant wire with its voltage, electric current access signal amplifier;
The ⅵ computing machine amplifies voltage, current signal by data collecting card;
ⅶ obtains the temperature value of detected part by computing and demarcation temperature-resistance conversion formula.
L-type described in the present invention can be opened the inner certain thickness waterproof material polyurethane of filling of xoncrete structure.
Effect of the present invention and benefit are: the carbon fiber that employing the present invention proposes/nanometer carbon black cement-base composite material temperature monitoring method, the temperature detection sensitivity that can improve the Carbon Fiber Cement-based Composites temperature sensor; Fill opening in the L shaped xoncrete structure of certain thickness waterproof material polyurethane by inserting inside, moulding is easy, and can eliminate the variation of the factors such as extraneous stress, humidity and the length of time to the variation of its temperature-resistance characteristic, can realize the temperature survey of stablizing, preparing; With the variation of crossing constant pressure source and signal amplifier and can the Measurement accuracy ambient temperature change the carbon fiber that causes/nanometer carbon black cement-base composite material temperature sensor resistance, temperature detection highly sensitive.
Description of drawings
Fig. 1 is carbon fiber/nanometer carbon black cement-base composite material engineering real-time temperature test sytem figure.
Specific embodiment:
As shown in the figure, a kind of composite material engineering temperature monitoring system, comprise that temperature sensor original paper 2, described temperature sensor original paper outer setting have the L shaped xoncrete structure 3 of opening, described temperature sensor original paper is connected with signal amplifier 6 by wire 4, described signal amplifier 6 links to each other with data collecting card 7, described data collecting card 7 links to each other with computing machine 8, and described sensor original paper 2 also is connected with constant pressure source 5.During use this engineering temperature monitoring system is embedded the position that needs to measure temperature in the large volume concrete structural 1, adopt high temperature resistant wire with its voltage, electric current access signal amplifier 6, computing machine amplifies voltage, current signal by data collecting card 7, obtains the temperature value of detected part by computing and demarcation temperature-resistance conversion formula.L-type can be opened in the xoncrete structure 3 and is provided with filling material among the present invention, and described filling material is waterproof material polyurethane, can effectively avoid extraneous humidity on the impact of temperature sensor.Adopting L-type can open xoncrete structure 3 can effectively avoid temperature sensor original paper 2 to be subjected to the impact of extraneous STRESS VARIATION.In order to realize accurate monitoring, external protection is adopted can open L shaped device xoncrete structure 3, and filling material adopts environmental protection, durable good weatherability, without seam integral waterproofing film polyurethane material.
A kind of composite material engineering temperature monitoring method may further comprise the steps:
ⅰ at first makes carbon fiber/nanometer carbon black cement-base composite material engineering temperature sensor original paper 2 by chopped carbon fiber and nanometer carbon black with the method for burying four stainless (steel) wire electrodes underground;
Secondly ⅱ can open xoncrete structure 3 with the carbon fiber that makes/nanometer carbon black cement-base composite material engineering temperature sensor original paper 2 outside L-types of installing;
ⅲ will be provided with the L-type of carbon fiber/nanometer carbon black cement-base composite material engineering temperature sensor original paper 2 can open the position that needs to measure temperature in the xoncrete structure 3 embedding large volume concrete structurals 1;
ⅳ adopts constant pressure source 5 to encourage carbon fiber/nanometer carbon black cement-base composite material sensor original paper 2;
ⅴ carbon fiber/nanometer carbon black cement-base composite material engineering temperature sensor original paper 2 adopts high temperature resistant wire 4 with its voltage, electric current access signal amplifier 6;
ⅵ computing machine 8 amplifies voltage, current signal by data collecting card 7;
ⅶ obtains the temperature value of detected part by computing and demarcation temperature-resistance conversion formula.
The manufacturing process of the temperature sensor original paper 2 that carbon fiber/nano carbon black cement-base composite material is made is: at first get an amount of warm water (about 50 ℃), place methylcellulose water and continuous the stirring that it is dissolved fully, put into water reducer, defoamer and carbon fiber after the cooling, in this process, to constantly be stirred to the carbon fiber Uniform Dispersion, without any agglomeration, it is added in the agitated kettle; Then the nano carbon black that takes by weighing, silicon ash, cement, sand etc. are added in the stirring machine and constantly and stir; The carbon fiber that stirs/nano carbon black mixed mortar is poured in the mould, inserted the stainless (steel) wire electrode, and in the shaking table moulding of vibrating; Two L shaped concrete of moulding; L shaped bottom of device sprays into certain thickness polyurethane after combination, places carbon fiber/nano carbon black cement-base composite material temperature sensor, continues to spray polyurethane airtight to cavity.
The temperature sensor original paper 2 that placement carbon fiber/nano carbon black cement-base composite material can be made among the present invention, external L shaped the unlatching in any large volume concrete structural 1 that need to detect temperature of xoncrete structure 3 rear embeddings, the present embodiment take large volume concrete structural 1 as example illustrates specific implementation process of the present invention.For the temperature control experiment, at first will place the L shaped xoncrete structure 3 of opening of carbon fiber/nano carbon black cement-base composite material temperature sensor and be embedded in the mass concrete cubic block 1; Adopt four high temperature resistant wires 4 that temperature sensor original paper 2 is linked to each other with signal amplifier 6 with the accurate constant pressure source 5 of a 1V, adopt the four electrode method test resistance can effectively eliminate the impact of contact resistance; Signal amplifier can amplify measured voltage, current value, so that the data obtained is more accurate.
If carbon fiber/nano carbon black cement-base composite material temperature sensor test voltage is V, measuring current is I, and β is electric current, the voltage amplification factor of signal amplifier.Then the resistance signal of Computing processing is:
In the following formula,
Initial resistance when not imbedding structure,
The resistance change of the carbon fiber that causes for structure temperature/nano carbon black cement-base composite material temperature sensor,
,
With
Be subjected to the resistance change that causes in extraneous stress, humidity and the length of time for sensor.
Because the temperature sensor original paper 2 that carbon fiber/nano carbon black cement-base composite material is made adopts and L shapedly opens xoncrete structure 3 outer protections, fills certain thickness polyurethane and mix again nano carbon black, therefore since humidity, extraneous stress and the variable quantity that causes the length of time can ignore.Therefore (1) formula becomes:
Temperature by demarcating in advance-sensitivity curve obtains the temperature variation of mass concrete cubic block in the temperature control process.
Claims (2)
1. composite material engineering temperature monitoring method is characterized in that may further comprise the steps:
ⅰ at first makes carbon fiber/nanometer carbon black cement-base composite material engineering temperature sensor original paper (2) by chopped carbon fiber and nanometer carbon black with the method for burying four stainless (steel) wire electrodes underground;
Secondly ⅱ can open xoncrete structure (3) with the carbon fiber that makes/outside L-type of installing of nanometer carbon black cement-base composite material engineering temperature sensor original paper (2);
ⅲ will be provided with the L-type of carbon fiber/nanometer carbon black cement-base composite material engineering temperature sensor original paper (2) can open xoncrete structure (3) embeds needs to measure temperature in the large volume concrete structural (1) position;
ⅳ adopts constant pressure source (5) to encourage carbon fiber/nanometer carbon black cement-base composite material sensor original paper (2);
ⅴ carbon fiber/nanometer carbon black cement-base composite material engineering temperature sensor original paper (2) adopts high temperature resistant wire (4) with its voltage, electric current access signal amplifier (6);
ⅵ computing machine (8) amplifies voltage, current signal by data collecting card (7);
ⅶ obtains the temperature value of detected part by computing and demarcation temperature-resistance conversion formula.
2. a kind of composite material engineering temperature monitoring method as claimed in claim 1 is characterized in that described L-type can open the inner certain thickness waterproof material polyurethane of filling of xoncrete structure (3).
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| CN201110194645.XA CN102879120B (en) | 2011-07-13 | 2011-07-13 | Method for monitoring composite material engineering temperature |
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| CN201110194645.XA CN102879120B (en) | 2011-07-13 | 2011-07-13 | Method for monitoring composite material engineering temperature |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487157A (en) * | 2013-10-14 | 2014-01-01 | 清华大学 | Sensor component for fine multipoint temperature measurement in metal die |
| CN103674300A (en) * | 2013-11-26 | 2014-03-26 | 河海大学 | Manufacturing method for temperature sensor |
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| CN101216443A (en) * | 2008-01-02 | 2008-07-09 | 沈阳建筑大学 | Piezoelectric intelligent aggregate for civil engineering works structure health monitoring |
| CN101509757A (en) * | 2009-01-17 | 2009-08-19 | 大连理工大学 | Carbon fibre conducting cement-based composite material engineering strain measuring system |
| US20100118916A1 (en) * | 2006-08-18 | 2010-05-13 | Usa As Represented By The Administrator Of The National Aeronautics And Space Administration | Flexible Thin Metal Film Thermal Sensing System |
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Patent Citations (3)
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|---|---|---|---|---|
| US20100118916A1 (en) * | 2006-08-18 | 2010-05-13 | Usa As Represented By The Administrator Of The National Aeronautics And Space Administration | Flexible Thin Metal Film Thermal Sensing System |
| CN101216443A (en) * | 2008-01-02 | 2008-07-09 | 沈阳建筑大学 | Piezoelectric intelligent aggregate for civil engineering works structure health monitoring |
| CN101509757A (en) * | 2009-01-17 | 2009-08-19 | 大连理工大学 | Carbon fibre conducting cement-based composite material engineering strain measuring system |
Non-Patent Citations (2)
| Title |
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| 刘军: "碳纤维水泥基复合材料电性能及其改善的研究", 《中国优秀硕士学位论文全文数据库：工程科技II辑》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487157A (en) * | 2013-10-14 | 2014-01-01 | 清华大学 | Sensor component for fine multipoint temperature measurement in metal die |
| CN103674300A (en) * | 2013-11-26 | 2014-03-26 | 河海大学 | Manufacturing method for temperature sensor |
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| CN102879120B (en) | 2015-02-11 |
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Effective date of registration: 20231227 Address after: No. 130 Shimenkan, Qinhuai District, Nanjing, Jiangsu 210007 Patentee after: Nanjing Housing Construction Engineering Testing Co.,Ltd. Address before: 211100 No. 8 West Buddha Road, Jiangning District, Jiangsu, Nanjing Patentee before: HOHAI University |