CN1818577A - Sensitive concrete sensing component for measuring temperature - Google Patents
Sensitive concrete sensing component for measuring temperature Download PDFInfo
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- CN1818577A CN1818577A CN 200610024718 CN200610024718A CN1818577A CN 1818577 A CN1818577 A CN 1818577A CN 200610024718 CN200610024718 CN 200610024718 CN 200610024718 A CN200610024718 A CN 200610024718A CN 1818577 A CN1818577 A CN 1818577A
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Abstract
A method for preparing concrete sensing element being used to carry out self-temperature measurement includes forming test block material by carbon fiber and cement plaster with mass ratio as 99-99.5% of cement plaster to 0. 5-1% of carbon fiber or by micro steel fiber and cement plaster with mass ratio as 97-99%of cement plaster to 1-3% of micro steel fiber, mixing above said two prepared materials with ratio of 1:1 to form test block and setting a pair of electrodes on test block.
Description
Technical field
What the present invention relates to is the sensing element in a kind of detection technique field, specifically, relate to a kind of be used to monitor the mass concrete internal temperature changes and can with the temperature that mass concrete combines together the clever concrete sensor component of testing oneself.
Background technology
Concrete is a most widely used structured material in the civil engineering work, and particularly application is more extensive in those large-scale structures, as the foundation of dam, skyscraper and the structure that some is special.Usually, concrete is in the hydration and hardening process, because hydration reaction can be emitted certain heat, those mass concretes particularly, its thermal discharge is very considerable, this will cause that mass concrete is inside and outside and produce the bigger temperature difference, easily produce thermal cracking, cause the dangerous of structure.In order to control the temperature difference, usually need pre-buried thermoelectricity occasionally temperature sensor carry out temperature monitoring, improved construction costs so on the one hand, the more important thing is the stress raisers that caused structure and reduced durability of structures.Therefore, can develop a kind of can be compatible and can realize that the cement based sensing element that temperature is tested oneself seems very necessary and urgent with mass concrete.In the last few years, Chinese scholars was found after deliberation, and chopped carbon fiber is incorporated in the cement concrete, formed conductive path after carbon fiber content reaches certain level, and utilized this characteristic, researched and developed out the alert and resourceful cement-base composite material of realization damnification self-diagnosis.
Find through literature search prior art, Chinese patent publication number: CN1484027A, patent name: clever concrete sensor component, this patent are mentioned and are adopted chopped carbon fiber to prepare a kind of concrete sensor that is used to monitor civil structure.Therefore, chopped carbon fiber is introduced cement concrete, to give its some special performances, as characteristics such as electric conductivity, damnification self-diagnosis, simultaneously, mixing of conductive fiber makes cement concrete become a kind of semiconductor material, has Seebeck effect, can sense temperature change, as a kind of temperature sensor.
Summary of the invention
The objective of the invention is to the above characteristic that has at the conductive fiber cement concrete, a kind of clever concrete sensor component that temperature is tested oneself that is used for is provided, to realize that the mass concrete internal temperature is from monitoring.
The present invention is achieved by the following technical solutions, and the present invention is made of test block and the pair of electrodes that is provided with in test block, and the test block material is conductive fiber and sand-cement slurry base-material, and conductive fiber is dispersed in the sand-cement slurry base-material.
Described electrode has a pair of, and electrode is embedded in the test block.
Described conductive fiber, for carbon fiber or/and fine steel fibre.
Described test block material is the carbon-fiber cement mortar, and when being carbon fiber and sand-cement slurry base-material, its composition (mass ratio) is sand-cement slurry base-material 99-99.5%, carbon fiber 0.5-1%.
Described test block material is fine steel fibre mortar, and when being fine steel fibre and sand-cement slurry base-material, its composition (mass ratio) is sand-cement slurry base-material 97-99%, fine steel fibre 1-3%.
Described test block material is that above-described carbon-fiber cement mortar and fine steel fibre mortar carried out compound in 1: 1 by volume.
Described carbon fiber is a chopped carbon fiber, and its length average out to 5 ± 2mm, diameter are 7 ± 0.2 μ m, and conductance is 10
-2-10
-3Ω cm.
Described fine steel fibre, its length average out to 5 ± 2mm, diameter is 0.5 ± 0.2mm, conductance is 6 * 10
-5Ω cm.
After the sand-cement slurry base-material prepared in proportion, conductive fiber is admixed in the base-material equably, then pours in 40mm * 40mm * 160mm rectangular parallelepiped die trial, simultaneously electrode arrangement is solidified into sensor again in test block.
The present invention utilizes the conductive fiber with conducting function evenly to distribute in sand-cement slurry, forms conductive network, constitutes semiconductor.Inside and outside concrete,, form a thermograde, and the conductive fiber sand-cement slurry because forming thermoelectromotive force, Seebeck effect monitors the variation of concrete internal temperature more easily by the test electromotive force owing to action of thermal difference.Because the principal ingredient of apparatus of the present invention is potpourris of cement and sand, so its permanance is fine, and with cement concrete reasonable compatibility is arranged.Can directly device of the present invention be placed in the mass concrete during use, mounting process is simple.To compare its manufacturing cost lower with thermopair now commonly used, and realized that the cement concrete material temperature is from monitoring.
Description of drawings
Fig. 1 is the structural representation of embodiments of the invention 1;
Fig. 2 is the structural representation of embodiments of the invention 1;
Fig. 3 is the structural representation of embodiments of the invention 3;
Fig. 4 is the temperature variation and the electromotive force corresponding relation synoptic diagram of the carbon-fiber cement mortar sensing element tested among the embodiment 1;
Fig. 5 is the temperature variation and the electromotive force corresponding relation synoptic diagram of the fine steel fiber feinforced cement mortar sensing element tested among the embodiment 2;
Fig. 6 is the temperature variation and the electromotive force corresponding relation synoptic diagram of carbon-fiber cement mortar-fine steel fiber feinforced cement mortar sensing element of being tested among the embodiment 3.
Embodiment
Also further describe the present invention in conjunction with the accompanying drawings below by embodiment:
Table 1 is the physicochemical property parameter of the carbon fiber of embodiment of the invention employing;
Table 2 is physicochemical property parameters of the fine steel fibre of embodiment of the invention employing;
| Diameter (μ m) | Density (g/cm 3) | Tensile strength (GPa) | Elastic modulus (GPa) | Extensibility (%) | Carbon content (wc%) | Conductance (Ω cm) |
| 7±0.2 | 1.78 | ＞3.0 | 220-240 | 1.25-1.60 | ＞95 | 10 -2-10 -3 |
Table 1
| Diameter (mm) | Density (g/cm 3) | Tensile strength (MPa) | Elastic modulus (GPa) | Extensibility (%) | Conductance (Ω cm) |
| 0.5 | 7.7 | 970 | 220 | 3.2 | 6×10 5 |
Table 2
Embodiment 1
Associative list 1 and Fig. 1, with carbon fiber 0.5-1%, the ratio of sand-cement slurry base-material 99-99.5% prepares raw material.The sand-cement slurry base-material, its composition (quality) is a portland cement 33%, silica flour 5%, normal sand 38%, water 23%, methylcellulose 1.0%.Wherein carbon fiber is a chopped carbon fiber, and the length average out to is 5 ± 2mm, and diameter is 7 ± 0.2 μ m, and conductance is 10
-2-10
-3Ω cm.The starting material that prepare are made by following technology: at first take by weighing 30% water, methylcellulose is scattered in wherein, stirs with glass bar simultaneously, leave standstill and guarantee about 20 minutes that methylcellulose dissolves fully, subsequently carbon fiber is added in the solution, and constantly stir.Remaining 70% water is added in the agitated kettle, and gradation adds silicon ash, cement and normal sand, and the solution that will be dispersed with carbon fiber at last adds and stirs, and needs altogether to stir about 3 minutes.Stirring finishes, and will mix and stir material and pack in the die trial, carries out the dither moulding, and the pre-buried electrode of size in accordance with regulations, as Fig. 1.After the sample demoulding, send into and carry out maintenance in the standard curing room.In the time of 28 days, take out sample and test test result such as Fig. 4.Among Fig. 1,1 for being embedded in electrode in the test block, 2 test blocks for carbon-fiber cement mortar composition.In Fig. 4, a is a heating curve, and b is a temperature lowering curve.As seen from the figure, have linear corresponding relation between the thermoelectromotive force of system and the temperature variation, its Seebeck coefficient reaches 25.0 μ v/ ℃.
Claims (8)
1, a kind ofly is used for the clever concrete sensor component that temperature is tested oneself, it is characterized in that, constitute by test block and the pair of electrodes that in test block, is provided with, the test block material is made up of conductive fiber and sand-cement slurry base-material, described conductive fiber, for carbon fiber or/and fine steel fibre be dispersed in the sand-cement slurry base-material.
2, according to claim 1ly be used for the clever concrete sensor component that temperature is tested oneself, it is characterized in that described electrode has a pair of, electrode is embedded in the test block.
3, according to claim 1ly be used for the clever concrete sensor component that temperature is tested oneself, it is characterized in that described test block material is the carbon-fiber cement mortar, when being carbon fiber and sand-cement slurry base-material, it forms mass ratio is sand-cement slurry base-material 99-99.5%, carbon fiber 0.5-1%.
4, according to claim 1ly be used for the clever concrete sensor component that temperature is tested oneself, it is characterized in that described test block material is fine steel fibre mortar, when being fine steel fibre and sand-cement slurry base-material, it forms mass ratio is sand-cement slurry base-material 97-99%, fine steel fibre 1-3%.
5, describedly be used for the clever concrete sensor component that temperature is tested oneself according to claim 1 or 3 or 4, it is characterized in that described test block material is that described carbon-fiber cement mortar and fine steel fibre mortar carried out compound in 1: 1 by volume.
6, according to claim 1ly be used for the clever concrete sensor component that temperature is tested oneself, it is characterized in that described carbon fiber is a chopped carbon fiber.
7, according to claim 6ly be used for the clever concrete sensor component that temperature is tested oneself, it is characterized in that, described chopped carbon fiber, its length average out to 5 ± 2mm, diameter are 7 ± 0.2 μ m, conductance is 10
-2-10
-3Ω cm.
8, describedly be used for the clever concrete sensor component that temperature is tested oneself according to claim 1 or 4, it is characterized in that, described fine steel fibre, its length average out to 5 ± 2mm, diameter is 0.5 ± 0.2mm, conductance is 6 * 10
-5Ω cm.
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|---|---|---|---|
| CN 200610024718 CN1818577A (en) | 2006-03-16 | 2006-03-16 | Sensitive concrete sensing component for measuring temperature |
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|---|---|---|---|
| CN 200610024718 CN1818577A (en) | 2006-03-16 | 2006-03-16 | Sensitive concrete sensing component for measuring temperature |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101886954A (en) * | 2010-07-09 | 2010-11-17 | 济南大学 | Cement-based temperature sensing element for positive and negative temperature automatic measurement |
| CN102323396A (en) * | 2011-06-27 | 2012-01-18 | 中国建筑第二工程局有限公司 | Solid simulation test device for mass concrete and test construction method thereof |
| CN102923984A (en) * | 2012-10-09 | 2013-02-13 | 西安建筑科技大学 | Method for improving Seebeck coefficient of carbon fiber cement-based composite material |
| CN103274646A (en) * | 2013-06-13 | 2013-09-04 | 大连海事大学 | Stress sensor made of graphene oxide cement-based composite material |
| CN103649007A (en) * | 2010-12-27 | 2014-03-19 | 杰哈德·艾伊斯 | Structural element for generating thermoelectric power and method for the production thereof |
| CN105336083A (en) * | 2015-12-03 | 2016-02-17 | 山东大学 | Tunnel fire early warning sensor based on smart materials and road surface layout system of tunnel fire early warning sensor |
| CN109798998A (en) * | 2019-02-22 | 2019-05-24 | 山东建筑大学 | A kind of thermocouple measurement device and method accurately fixed |
-
2006
- 2006-03-16 CN CN 200610024718 patent/CN1818577A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101886954A (en) * | 2010-07-09 | 2010-11-17 | 济南大学 | Cement-based temperature sensing element for positive and negative temperature automatic measurement |
| CN103649007A (en) * | 2010-12-27 | 2014-03-19 | 杰哈德·艾伊斯 | Structural element for generating thermoelectric power and method for the production thereof |
| CN103649007B (en) * | 2010-12-27 | 2016-06-29 | 杰哈德·艾伊斯 | For element producing thermocurrent and preparation method thereof |
| CN102323396A (en) * | 2011-06-27 | 2012-01-18 | 中国建筑第二工程局有限公司 | Solid simulation test device for mass concrete and test construction method thereof |
| CN102923984A (en) * | 2012-10-09 | 2013-02-13 | 西安建筑科技大学 | Method for improving Seebeck coefficient of carbon fiber cement-based composite material |
| CN102923984B (en) * | 2012-10-09 | 2014-03-12 | 西安建筑科技大学 | Method for improving Seebeck coefficient of carbon fiber cement-based composite material |
| CN103274646A (en) * | 2013-06-13 | 2013-09-04 | 大连海事大学 | Stress sensor made of graphene oxide cement-based composite material |
| CN105336083A (en) * | 2015-12-03 | 2016-02-17 | 山东大学 | Tunnel fire early warning sensor based on smart materials and road surface layout system of tunnel fire early warning sensor |
| CN105336083B (en) * | 2015-12-03 | 2018-06-29 | 山东大学 | Tunnel fire hazard early warning sensor and its road surface arranging system based on smart material |
| CN109798998A (en) * | 2019-02-22 | 2019-05-24 | 山东建筑大学 | A kind of thermocouple measurement device and method accurately fixed |
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