CN102879120B - Method for monitoring composite material engineering temperature - Google Patents
Method for monitoring composite material engineering temperature Download PDFInfo
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- CN102879120B CN102879120B CN201110194645.XA CN201110194645A CN102879120B CN 102879120 B CN102879120 B CN 102879120B CN 201110194645 A CN201110194645 A CN 201110194645A CN 102879120 B CN102879120 B CN 102879120B
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- 239000002131 composite material Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000012544 monitoring process Methods 0.000 title claims abstract description 17
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 46
- 239000004917 carbon fiber Substances 0.000 claims abstract description 46
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000004567 concrete Substances 0.000 claims abstract description 15
- 239000004568 cement Substances 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 239000006229 carbon black Substances 0.000 claims description 40
- 230000008859 change Effects 0.000 claims description 12
- 239000004814 polyurethane Substances 0.000 claims description 10
- 229920002635 polyurethane Polymers 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 238000007493 shaping process Methods 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 238000005054 agglomeration Methods 0.000 claims description 2
- 230000002776 aggregation Effects 0.000 claims description 2
- 230000003321 amplification Effects 0.000 claims description 2
- 239000002956 ash Substances 0.000 claims description 2
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 239000013530 defoamer Substances 0.000 claims description 2
- 229920000609 methyl cellulose Polymers 0.000 claims description 2
- 239000001923 methylcellulose Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000004570 mortar (masonry) Substances 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 239000004576 sand Substances 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 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
- 239000000463 material Substances 0.000 description 7
- 238000005259 measurement Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 241000872198 Serjania polyphylla Species 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction 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
- 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
- 230000002441 reversible effect Effects 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
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- Measuring Temperature Or Quantity Of Heat (AREA)
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 a kind of temperature monitoring method of engineering site long term monitoring field, particularly relate to a kind of carbon fiber/nanometer carbon black cement-base composite material engineering temperature method of real-time.
Background technology
In engineering site detects, the monitoring of large volume concrete structural basal temperature in construction time process is for rationally solving temperature stress and control critical eigenvalue is carried out and to be played an important role and traditional thermometer, thermocouple etc. have constrained accuracy and the precision of data greatly as traditional detection means of sensor.Though advanced fiber-optical grating temperature sensor has the advantages such as volume sluggishness is high, corrosion-resistant, electromagnetism interference, transmission band are wider, but its fancy price hinders it to apply widely, the change of its temperature of electrical resistance of Carbon Fiber Cement-based Composites and reversible change, cheap, be easy to carry out distributed measurement, be applicable to on-the-spot Long Period Health Monitoring.But the resistance due to Carbon Fiber Cement-based Composites is subject to many-sided impacts such as stress, humidity, the length of time, causes measurement result to have very large uncertainty, is very restricted in actual applications.
Directly adopt multimeter to measure the resistance of Carbon Fiber Cement-based Composites in lot of documents, and carried out the relation of analysis temperature and resistance or resistance change by the contrast of overall electrical resistance, there is test unit simple, the advantages such as test result is directly perceived.But the resistance change caused due to temperature is still smaller compared with matrix resistance, and therefore said method precision is not high.
Summary of the invention
The object of this invention is to provide a kind ofly be applicable to engineering site long term monitoring, stability is high, precision is high, applied widely, realize the multifactor carbon fiber/nanometer carbon black cement-base composite material engineering temperature monitoring method avoided, to make up the deficiency of current Carbon Fiber Cement-based Composites in practical engineering application in temperature monitoring.
Technical scheme of the present invention is:
A kind of composite material engineering temperature monitoring method comprises the following steps:
First I 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 burying four stainless (steel) wire electrodes underground;
L-type is installed in the carbon fiber made/nanometer carbon black cement-base composite material engineering temperature sensor original paper outside secondly by II can open xoncrete structure;
The L-type being provided with carbon fiber/nanometer carbon black cement-base composite material engineering temperature sensor original paper can be opened xoncrete structure and be embedded the position needing measuring tempeature in large volume concrete structural by III;
Carbon fiber/nanometer carbon black cement-base composite material sensor elements adopts constant pressure source to encourage by IV;
V carbon fiber/nanometer carbon black cement-base composite material engineering temperature sensor original paper adopts high temperature resistant wire by its voltage, electric current access signal amplifier;
VI computing machine amplifies voltage, current signal by data collecting card;
VII is by computing and demarcate the temperature value that temperature-resistance conversion formula obtains detected part.
L-type described in the present invention can be opened xoncrete structure inside and be filled certain thickness waterproof material polyurethane.
Effect of the present invention and benefit are: the carbon fiber/nanometer carbon black cement-base composite material temperature monitoring method adopting the present invention to propose, and can improve the temperature detection sensitivity of Carbon Fiber Cement-based Composites temperature sensor; By inserting in the opened L shape xoncrete structure of inner filling certain thickness waterproof material polyurethane, shaping easy, and the change can eliminating the factors such as extraneous stress, humidity and the length of time, to the change of its temperature-resistance characteristic, can realize the temperature survey of stablizing, preparing; Measurement accuracy ambient temperature the change of the carbon fiber/nanometer carbon black cement-base composite material temperature sensor resistance caused can be changed, temperature detection highly sensitive with crossing constant pressure source and signal amplifier.
Accompanying drawing explanation
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 temperature sensor original paper 2, described temperature sensor original paper outer setting has L shape can open xoncrete structure 3, described temperature sensor original paper is connected with signal amplifier 6 by wire 4, described signal amplifier 6 is connected with data collecting card 7, described data collecting card 7 is connected with computing machine 8, and described sensor elements 2 is also connected with constant pressure source 5.During use, this engineering temperature monitoring system is embedded the position needing measuring tempeature in large volume concrete structural 1, adopt high temperature resistant wire by its voltage, electric current access signal amplifier 6, computing machine amplifies voltage, current signal by data collecting card 7, is obtained the temperature value of detected part by computing and demarcation temperature-resistance conversion formula.In the present invention, L-type can be opened in xoncrete structure 3 and is provided with filling material, and described filling material is waterproof material polyurethane, can effectively avoid ambient humidity on the impact of temperature sensor.Adopting L-type can open xoncrete structure 3 can effectively avoid temperature sensor original paper 2 by the impact of extraneous STRESS VARIATION.In order to realize accurate measurements, external protection adopts can open L shape device xoncrete structure 3, filling material adopt environmental protection, durable good weatherability, without seam integral waterproofing film polyurethane material.
A kind of composite material engineering temperature monitoring method, comprises the following steps:
First I 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 burying four stainless (steel) wire electrodes underground;
L-type is installed in the carbon fiber made/nanometer carbon black cement-base composite material engineering temperature sensor original paper 2 outside secondly by II can open xoncrete structure 3;
III can be opened xoncrete structure 3 and embed being provided with the carbon fiber/L-type of nanometer carbon black cement-base composite material engineering temperature sensor original paper 2 position needing measuring tempeature in large volume concrete structural 1;
Carbon fiber/nanometer carbon black cement-base composite material sensor elements 2 adopts constant pressure source 5 to encourage by IV;
V carbon fiber/nanometer carbon black cement-base composite material engineering temperature sensor original paper 2 adopts high temperature resistant wire 4 by its voltage, electric current access signal amplifier 6;
VI computing machine 8 amplifies voltage, current signal by data collecting card 7;
VII is by computing and demarcate the temperature value that temperature-resistance conversion formula obtains detected part.
The manufacturing process of the temperature sensor original paper 2 that carbon fiber/nano carbon black cement-base composite material is made is: first get appropriate warm water (about 50 DEG C), methylcellulose being placed in water and constantly stirring makes it dissolve completely, water reducer, defoamer and carbon fiber is put into after cooling, to constantly be stirred to carbon fiber in the process dispersed, without any agglomeration, added in agitated kettle; Then the nano carbon black taken, silicon ash, cement, sand etc. are added in stirring machine and also constantly stir; The carbon fiber be stirred/nano carbon black mixed mortar is poured in mould, insert stainless (steel) wire electrode, and it is shaping to vibrate on a vibration table; Shaping two L shape concrete; L shape bottom of device sprays into certain thickness polyurethane after combining, 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 placement carbon fiber/nano carbon black cement-base composite material can made in the present invention, external L shape can be opened and be embedded any needs in the large volume concrete structural 1 detected temperature after xoncrete structure 3, and the present embodiment is for large volume concrete structural 1 explanation specific embodiment of the invention process.For temperature control experiment, first placement carbon fiber/nano carbon black cement-base composite material temperature sensor L shape can be opened xoncrete structure 3 and is embedded in mass concrete cubic block 1; Adopt four high temperature resistant wires 4 to be connected with signal amplifier 6 with the accurate constant pressure source 5 of a 1V by temperature sensor original paper 2, adopt four electrode method test resistance effectively can eliminate the impact of contact resistance; Measured voltage, current value can amplify by signal amplifier, make the data obtained more accurate.
If carbon fiber/nano carbon black cement-base composite material temperature sensor test voltage is V, electric current, the voltage amplification factor of measuring current to be I, β be signal amplifier.Then the resistance signal of Computing process is:
In above formula,
for not imbedding initial resistance during structure,
for the resistance change of carbon fiber/nano carbon black cement-base composite material temperature sensor that structure temperature causes,
,
with
for the resistance change that sensor caused by extraneous stress, humidity and the length of time.
The temperature sensor original paper 2 made due to carbon fiber/nano carbon black cement-base composite material adopts L shape can open outside xoncrete structure 3 to protect, fills certain thickness polyurethane and mix nano carbon black again, therefore because humidity, extraneous stress and the variable quantity that causes the length of time can be ignored.Therefore (1) formula becomes:
The temperature variation of mass concrete cubic block in temperature control process is obtained by the temperature-sensitivity curve demarcated in advance.
Claims (1)
1. a composite material engineering temperature monitoring method, is characterized in that comprising the following steps:
I first by chopped carbon fiber and nanometer carbon black and the method for burying four stainless (steel) wire electrodes underground make carbon fiber/
Nanometer carbon black cement-base composite material engineering temperature sensor original paper (2): first get appropriate warm water, methylcellulose being placed in continuous stirring of water makes it dissolve completely, water reducer, defoamer and carbon fiber is put into after cooling, and it is dispersed to be constantly stirred to carbon fiber, without any agglomeration, mixed liquor is added in stirring machine; Then nanometer carbon black, silicon ash, cement and sand are added in stirring machine and also constantly stir; The carbon fiber be stirred/nanometer carbon black mixed mortar is poured in mould, insert stainless (steel) wire electrode, and it is shaping to vibrate on a vibration table; Shaping two L shape concrete; L shape bottom of device after combining sprays into certain thickness polyurethane, places carbon fiber/nanometer carbon black cement-base composite material temperature sensor, continues to spray polyurethane airtight to cavity;
L type is installed in the carbon fiber made/nanometer carbon black cement-base composite material engineering temperature sensor original paper (2) outside secondly by II can open xoncrete structure (3);
The L type being provided with carbon fiber/nanometer carbon black cement-base composite material engineering temperature sensor original paper (2) can be opened xoncrete structure (3) and embed the position needing measuring tempeature in large volume concrete structural (1) by III;
Carbon fiber/nanometer carbon black cement-base composite material sensor elements (2) adopts constant pressure source (5) to encourage by IV;
V carbon fiber/nanometer carbon black cement-base composite material engineering temperature sensor original paper (2) adopts high temperature resistant wire (4) by its voltage, electric current access signal amplifier (6);
VI computing machine (8) amplifies voltage, current signal by data collecting card (7);
VII is by computing and demarcate the temperature value that temperature-resistance conversion formula obtains detected part;
If carbon fiber/nanometer carbon black cement-base composite material temperature sensor test voltage is V, electric current, the voltage amplification factor of measuring current to be I, β be signal amplifier;
Then the resistance signal of Computing process is:
In above formula,
for not imbedding initial resistance during structure,
for the resistance change of carbon fiber/nanometer carbon black cement-base composite material temperature sensor that structure temperature causes,
,
with
for the resistance change that sensor caused by extraneous stress, humidity and the length of time;
The temperature sensor original paper (2) made due to carbon fiber/nanometer carbon black cement-base composite material adopts L shape can open xoncrete structure (3) and protects outward, fill certain thickness polyurethane and mix nanometer carbon black again, therefore because humidity, extraneous stress and the variable quantity that causes the length of time can be ignored; Therefore above-mentioned formula becomes:
The temperature being obtained mass concrete cubic block in temperature control process by the temperature-sensitivity curve demarcated in advance is become
Change.
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| CN103487157B (en) * | 2013-10-14 | 2016-08-10 | 清华大学 | Sensor cluster for component for fine multipoint temperature measurement in metal die |
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| CN101216443B (en) * | 2008-01-02 | 2010-09-15 | 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 |
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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 |
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