CN102506691B - Cement-based intelligent composite material strain sensor with temperature compensation function - Google Patents
Cement-based intelligent composite material strain sensor with temperature compensation function Download PDFInfo
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- 239000004568 cement Substances 0.000 title claims abstract description 93
- 239000002131 composite material Substances 0.000 title claims abstract description 57
- 238000012544 monitoring process Methods 0.000 claims abstract description 150
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 35
- 239000004917 carbon fiber Substances 0.000 claims abstract description 35
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims description 35
- 239000011398 Portland cement Substances 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 239000003638 chemical reducing agent Substances 0.000 claims description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 10
- 239000006004 Quartz sand Substances 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 229910052802 copper Inorganic materials 0.000 claims description 10
- 239000010949 copper Substances 0.000 claims description 10
- 239000000839 emulsion Substances 0.000 claims description 8
- 229920000642 polymer Polymers 0.000 claims description 8
- 239000003513 alkali Substances 0.000 claims description 6
- 239000004816 latex Substances 0.000 claims description 6
- 229920000126 latex Polymers 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 2
- 239000004567 concrete Substances 0.000 abstract description 21
- 230000035945 sensitivity Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 230000008859 change Effects 0.000 description 34
- 238000000034 method Methods 0.000 description 14
- 230000008569 process Effects 0.000 description 11
- 230000007613 environmental effect Effects 0.000 description 10
- 239000000203 mixture Substances 0.000 description 9
- 238000001035 drying Methods 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 230000036541 health Effects 0.000 description 3
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- 238000011161 development Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000002585 base Substances 0.000 description 1
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- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The invention discloses a cement-based intelligent composite material strain sensor with a temperature compensation function, which comprises a strain monitoring module and a temperature monitoring module, wherein the strain monitoring module and the temperature monitoring module are formed by carbon-fiber cement-based intrinsic intelligent composite material and four parallel electrodes arranged on the composite material; and the strain monitoring module and the temperature monitoring module are connected and are respectively provided with four parallel electrodes. The cement-based intelligent composite material strain sensor has the advantages of temperature compensation function, high sensitivity coefficient, high voltage-sensitive and good performance stability, is applicable to strain monitoring of concrete structures under various environment conditions, avoids the defect of poor technical effect of a thermoelectric couple for directly measuring the temperature and carrying out temperature function, has the characteristics of high temperature compensation accuracy and simple technology and simultaneously improves the temperature compensation effect and the strain monitoring accuracy of the sensor under various strain conditions.
Description
Technical Field
The invention relates to a strain sensor, in particular to a cement-based intelligent composite material strain sensor with a temperature compensation function, which is used for strain monitoring of a concrete structure.
Background
At present, in civil engineering structures, a resistance strain gauge is widely used for monitoring the strain of a concrete structure, and the method has the advantages of mature technology, stability and reliability, but the strain gauge has the sensitivity coefficient of only 2-3, poor durability, complex installation process and high manufacturing cost, and cannot meet the technical requirement of long-term monitoring of the whole service life of people on important civil engineering structures. The cement-based intelligent composite material strain sensor has the advantages of high sensitivity coefficient, excellent durability and low cost, is simple in laying process and data acquisition, and is an important means for long-term monitoring of important civil engineering concrete structures such as large-span bridges, water conservancy dams and super high-rise buildings and a main direction for development of the strain sensor.
At present, in the process of detecting the health of a concrete structure, the superposition coupling of the resistivity change of a sensor caused by strain and the resistivity change caused by a temperature-sensitive effect still causes the main reasons that the resistivity stability of the cement-based intelligent composite material strain sensor is poor and the strain testing precision is not high, and the application and the development of the cement-based intelligent composite material strain sensor are seriously influenced. The output resistivity of the sensor during the concrete structure health monitoring is compensated by adopting a temperature compensation method, the fluctuation of the resistivity of the sensor and the reduction of the linear correlation of strain-resistivity caused by the change of the environmental temperature are avoided, the performance stability and the strain monitoring precision of the sensor under various environments are improved, and the method becomes one of the key contents of the application technology research of the current cement-based intelligent composite material strain sensor.
Chinese patents No. ZL 03128010.2 and No. ZL 03254119.8 in document 1 and document 2 disclose a high-sensitivity carbon fiber cement-based resistance strain sensing system with temperature compensation. The system is a sandwich structure formed by carbon fiber cement-based intelligent composite materials on the upper surface and the lower surface of a concrete beam, utilizes the phenomenon that the resistivity changes of intelligent composite material layers on the upper surface and the lower surface of the concrete beam are the same when the environmental temperature changes, realizes the temperature compensation of the output resistivity of the strain sensing system through the design of a differential circuit, eliminates the influence of the environmental temperature, improves the strain sensitivity stability of the carbon fiber cement-based resistance strain sensing system, and has extremely high strain-resistance sensitivity. However, the composition structure and the layout process of the strain sensing system are very complex, and the strain sensing system can only be applied to the bending deformation monitoring of the concrete beam, so that the application and the popularization of the cement-based intelligent composite material strain sensing system are limited.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the cement-based intelligent composite material strain sensor with the temperature compensation function, which has the advantages of temperature compensation function, high sensitivity coefficient, high pressure-sensitive characteristic linearity and good performance stability, and is suitable for strain monitoring of concrete structures under various environmental conditions.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a cement base intelligent composite strain sensor with temperature compensation function, includes strain monitoring module 1 and temperature monitoring module 2, and strain monitoring module 1 and temperature monitoring module 2 meet, strain monitoring module 1 and temperature monitoring module 2 are all symbolized intelligent combined material and are set up by carbon fiber cement basically four parallel electrodes 3 on the combined material constitute.
The carbon fiber cement basic intelligent composite material mainly comprises PAN-based chopped carbon fibers and portland cement in a mass ratio of (0.001-0.01) to 1;
or,
the carbon fiber cement basic intelligent composite material mainly comprises PAN-based chopped carbon fibers, portland cement and quartz sand in a mass ratio of (0.001-0.01) to 1 to (0.5-3.0).
The electrode 3 is a high-purity copper net.
The shapes of the strain monitoring module 1 and the temperature monitoring module 2 are cuboids, and the electrodes 3 are arranged perpendicular to the longest side of the cuboids and are symmetrical left and right.
The outer surface of the temperature monitoring module 2 is coated with a flexible cement-based material 4, and the coating thickness of the flexible cement-based material is more than 3.0% of the longest edge of the temperature monitoring module 2. The strain monitoring module 1 and the temperature monitoring module 2 are also connected by a flexible cement-based material 4.
The ratio of the elastic modulus of the flexible cement-based material 4 to the elastic modulus of the temperature monitoring module 2 is (0.05-0.1) to 1.
The flexible cement-based material 4 mainly comprises Portland cement, alkali-resistant latex powder and a water reducing agent in a mass ratio of 1: 0.02-0.80: 0.01;
or,
the flexible cement-based material 4 mainly comprises Portland cement, polymer emulsion and a water reducing agent in a mass ratio of 1: 0.02-0.80: 0.01, and the balance of impurities;
or,
the flexible cement-based material 4 mainly comprises Portland cement, alkali-resistant latex powder, a water reducing agent and quartz sand in a mass ratio of 1: 0.02-0.80: 0.01: 0.5-2.0, and the balance of impurities;
or,
the flexible cement-based material 4 mainly comprises Portland cement, polymer emulsion, a water reducing agent and quartz sand in a mass ratio of 1: 0.02-0.80: 0.01: 0.5-2.0, and the balance of impurities;
wherein the polymer emulsion is calculated by solid content.
Each electrode 3 is provided with a lead wire.
Compared with the prior art, the invention has the beneficial effects that:
1) the cement-based intelligent composite material strain sensor with the temperature compensation function mainly comprises a strain monitoring module and a temperature monitoring module, has the temperature compensation function, high sensitivity coefficient, high pressure-sensitive characteristic linearity and good performance stability, and is suitable for strain monitoring of concrete structures under various environmental conditions.
2) The temperature monitoring module is used for measuring the resistivity fluctuation of the intelligent composite material caused by the temperature change of the strain monitoring part of the concrete structure and compensating the output resistivity during the health monitoring of the strain monitoring module, thereby avoiding the resistivity fluctuation of the sensor and the linear correlation reduction of the strain-resistivity caused by the environmental temperature change and improving the performance stability and the strain monitoring precision of the sensor under various environments.
3) The temperature monitoring module is used for measuring the resistivity fluctuation of the carbon fiber cement basic intelligent composite material caused by temperature change, avoids the defect of poor technical effect of temperature compensation by directly measuring the temperature by the thermocouple, and has the characteristics of high temperature compensation precision and simple technology.
4) The outer surface of the temperature monitoring module of the sensor is coated with the flexible cement-based material, so that the resistivity fluctuation caused by the stress of the temperature monitoring module under the condition of embedding the concrete structure is avoided, and the temperature compensation effect and the strain monitoring precision of the sensor under various strain conditions are improved.
Drawings
Fig. 1 is a schematic structural diagram of a cement-based intelligent composite material strain sensor (cuboid shape) with a temperature compensation function according to the invention, and an arrow indicates a strain direction.
Fig. 2 is a sectional view taken along line a-a of fig. 1.
Fig. 3 is a sectional view taken along line B-B of fig. 1.
Fig. 4 is a cross-sectional view of fig. 1 taken along line C-C.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
Referring to fig. 1 to 4, a cement-based intelligent composite material strain sensor with a temperature compensation function comprises a strain monitoring module 1 and a temperature monitoring module 2, wherein the strain monitoring module 1 and the temperature monitoring module 2 are both formed by carbon fiber cement basic intelligent composite materials and four parallel electrodes 3 arranged on the composite materials, the strain monitoring module 1 and the temperature monitoring module 2 are connected with each other, the four parallel electrodes 3 are arranged on each of the strain monitoring module 1 and the temperature monitoring module 2, the electrodes 3 are high-purity copper nets, each electrode 3 is provided with a lead, the lead is led out, the shapes of the strain monitoring module 1 and the temperature monitoring module 2 are cuboids, and the electrodes 3 are perpendicular to the longest side of the cuboids and are arranged symmetrically.
The carbon fiber cement-based intrinsic intelligent composite material mainly comprises PAN-based chopped carbon fibers and Portland cement in a mass ratio of 0.001: 1, a carbon fiber cement mixture is obtained through a drying and dispersing process, the carbon fiber cement mixture and a copper mesh electrode are poured together, and a strain monitoring module 1 and a temperature monitoring module 2 of a sensor are formed through solidification. The outer surface of the temperature monitoring module 2 is coated with a flexible cement-based material 4 and is connected with the strain monitoring module 1 through the flexible cement-based material 4. The flexible cement-based material 4 mainly comprises Portland cement, alkali-resistant latex powder and a water reducing agent in a mass ratio of 1: 0.02: 0.01, and the elastic modulus of the flexible cement-based material is 10.0% of that of the temperature monitoring module.
In the cement-based intelligent composite material strain sensor with the temperature compensation function, strain in the direction perpendicular to four mesh electrodes 3 of a strain monitoring module 1 is input quantity of the sensor; when a dc voltage is applied between the two electrodes located at the outer sides of the strain monitoring module 1 and the temperature monitoring module 2, the voltages detected by the two inner electrodes are changed into the output of the sensor.
In the using process of the sensor, the voltage change detected by two electrodes at the inner side of the strain monitoring module 1 is converted into the resistivity change delta R1 of the strain monitoring module 1 by using the current value and the geometric parameters of the sensor; and then the voltage change detected by the two electrodes at the inner side of the temperature monitoring module 2 is converted into the resistivity change delta R2 of the temperature monitoring module 2 by using the current value and the geometric parameters of the sensor. Temperature compensation can then be obtained, and the resistivity change Δ R of the strain monitoring module is Δ R1- Δ R2, i.e. the resistivity change of the sensor caused by the strain of the concrete structure. And finally, comparing the established relation curve or relation between the strain and the resistivity change of the cement-based intelligent composite material sensor to realize strain monitoring of the concrete structure at various environmental temperatures.
Example 2
Referring to fig. 1 to 4, a cement-based intelligent composite material strain sensor with a temperature compensation function comprises a strain monitoring module 1 and a temperature monitoring module 2, wherein the strain monitoring module 1 and the temperature monitoring module 2 are both formed by carbon fiber cement basic intelligent composite materials and four parallel electrodes 3 arranged on the composite materials, the strain monitoring module 1 and the temperature monitoring module 2 are connected with each other, the four parallel electrodes 3 are arranged on each of the strain monitoring module 1 and the temperature monitoring module 2, the electrodes 3 are high-purity copper nets, each electrode 3 is provided with a lead, the lead is led out, the shapes of the strain monitoring module 1 and the temperature monitoring module 2 are cuboids, and the electrodes 3 are perpendicular to the longest side of the cuboids and are arranged symmetrically.
The carbon fiber cement-based intrinsic intelligent composite material mainly comprises PAN-based chopped carbon fibers, Portland cement and quartz sand in a mass ratio of 0.004: 1: 0.5, a carbon fiber cement mixture is obtained through a drying and dispersing process, the carbon fiber cement mixture and a copper mesh electrode are poured together, and a strain monitoring module 1 and a temperature monitoring module 2 of a sensor are formed through solidification. The outer surface of the temperature monitoring module 2 is coated with a flexible cement-based material 4 and is connected with the strain monitoring module 1 through the flexible cement-based material 4. The flexible cement-based material 4 mainly comprises Portland cement, alkali-resistant latex powder and a water reducing agent in a mass ratio of 1: 0.20: 0.01, and the elastic modulus of the flexible cement-based material is 8.0% of that of the temperature monitoring module.
In the cement-based intelligent composite material strain sensor with the temperature compensation function, strain in the direction perpendicular to four mesh electrodes 3 of a strain monitoring module 1 is input quantity of the sensor; when a dc voltage is applied between the two electrodes located at the outer sides of the strain monitoring module 1 and the temperature monitoring module 2, the voltages detected by the two inner electrodes are changed into the output of the sensor.
In the using process of the sensor, the voltage change detected by two electrodes at the inner side of the strain monitoring module 1 is converted into the resistivity change delta R1 of the strain monitoring module 1 by using the current value and the geometric parameters of the sensor; and then the voltage change detected by the two electrodes at the inner side of the temperature monitoring module 2 is converted into the resistivity change delta R2 of the temperature monitoring module 2 by using the current value and the geometric parameters of the sensor. Temperature compensation can then be obtained, and the resistivity change Δ R of the strain monitoring module is Δ R1- Δ R2, i.e. the resistivity change of the sensor caused by the strain of the concrete structure. And finally, comparing the established relation curve or relation between the strain and the resistivity change of the cement-based intelligent composite material sensor to realize strain monitoring of the concrete structure at various environmental temperatures.
Example 3
Referring to fig. 1 to 4, a cement-based intelligent composite material strain sensor with a temperature compensation function comprises a strain monitoring module 1 and a temperature monitoring module 2, wherein the strain monitoring module 1 and the temperature monitoring module 2 are both formed by carbon fiber cement basic intelligent composite materials and four parallel electrodes 3 arranged on the composite materials, the strain monitoring module 1 and the temperature monitoring module 2 are connected with each other, the four parallel electrodes 3 are arranged on each of the strain monitoring module 1 and the temperature monitoring module 2, the electrodes 3 are high-purity copper nets, each electrode 3 is provided with a lead, the lead is led out, the shapes of the strain monitoring module 1 and the temperature monitoring module 2 are cuboids, and the electrodes 3 are perpendicular to the longest side of the cuboids and are arranged symmetrically.
The carbon fiber cement-based intrinsic intelligent composite material mainly comprises PAN-based chopped carbon fibers and Portland cement in a mass ratio of 0.006: 1, a carbon fiber cement mixture is obtained through a drying and dispersing process, the carbon fiber cement mixture and a copper mesh electrode are poured together, and a strain monitoring module 1 and a temperature monitoring module 2 of a sensor are formed through solidification. The outer surface of the temperature monitoring module 2 is coated with a flexible cement-based material 4 and is connected with the strain monitoring module 1 through the flexible cement-based material 4. The flexible cement-based material 4 mainly comprises Portland cement, polymer emulsion (calculated by adopting solid content), a water reducing agent and quartz sand in a mass ratio of 1: 0.40: 0.01: 2.0, and the elastic modulus of the flexible cement-based material is 7.0 percent of that of the temperature monitoring module.
In the cement-based intelligent composite material strain sensor with the temperature compensation function, strain in the direction perpendicular to four mesh electrodes 3 of a strain monitoring module 1 is input quantity of the sensor; when a dc voltage is applied between the two electrodes located at the outer sides of the strain monitoring module 1 and the temperature monitoring module 2, the voltages detected by the two inner electrodes are changed into the output of the sensor.
In the using process of the sensor, the voltage change detected by two electrodes at the inner side of the strain monitoring module 1 is converted into the resistivity change delta R1 of the strain monitoring module 1 by using the current value and the geometric parameters of the sensor; and then the voltage change detected by the two electrodes at the inner side of the temperature monitoring module 2 is converted into the resistivity change delta R2 of the temperature monitoring module 2 by using the current value and the geometric parameters of the sensor. Temperature compensation can then be obtained, and the resistivity change Δ R of the strain monitoring module is Δ R1- Δ R2, i.e. the resistivity change of the sensor caused by the strain of the concrete structure. And finally, comparing the established relation curve or relation between the strain and the resistivity change of the cement-based intelligent composite material sensor to realize strain monitoring of the concrete structure at various environmental temperatures.
Example 4
Referring to fig. 1 to 4, a cement-based intelligent composite material strain sensor with a temperature compensation function comprises a strain monitoring module 1 and a temperature monitoring module 2, wherein the strain monitoring module 1 and the temperature monitoring module 2 are both formed by carbon fiber cement basic intelligent composite materials and four parallel electrodes 3 arranged on the composite materials, the strain monitoring module 1 and the temperature monitoring module 2 are connected with each other, the four parallel electrodes 3 are arranged on each of the strain monitoring module 1 and the temperature monitoring module 2, the electrodes 3 are high-purity copper nets, each electrode 3 is provided with a lead, the lead is led out, the shapes of the strain monitoring module 1 and the temperature monitoring module 2 are cuboids, and the electrodes 3 are perpendicular to the longest side of the cuboids and are arranged symmetrically.
The carbon fiber cement-based intrinsic intelligent composite material mainly comprises PAN-based chopped carbon fibers, Portland cement and quartz sand in a mass ratio of 0.01: 1: 3.0, a carbon fiber cement mixture is obtained through a drying and dispersing process, the carbon fiber cement mixture and a copper mesh electrode are poured together, and a strain monitoring module 1 and a temperature monitoring module 2 of a sensor are formed through solidification. The outer surface of the temperature monitoring module 2 is coated with a flexible cement-based material 4 and is connected with the strain monitoring module 1 through the flexible cement-based material 4. The flexible cement-based material 4 mainly comprises Portland cement, polymer emulsion (calculated by adopting solid content), a water reducing agent and quartz sand in a mass ratio of 1: 0.80: 0.01: 0.5, and the elastic modulus of the flexible cement-based material is 5.0% of that of the temperature monitoring module.
In the cement-based intelligent composite material strain sensor with the temperature compensation function, strain in the direction perpendicular to four mesh electrodes 3 of a strain monitoring module 1 is input quantity of the sensor; when a dc voltage is applied between the two electrodes located at the outer sides of the strain monitoring module 1 and the temperature monitoring module 2, the voltages detected by the two inner electrodes are changed into the output of the sensor.
In the using process of the sensor, the voltage change detected by two electrodes at the inner side of the strain monitoring module 1 is converted into the resistivity change delta R1 of the strain monitoring module 1 by using the current value and the geometric parameters of the sensor; and then the voltage change detected by the two electrodes at the inner side of the temperature monitoring module 2 is converted into the resistivity change delta R2 of the temperature monitoring module 2 by using the current value and the geometric parameters of the sensor. Temperature compensation can then be obtained, and the resistivity change Δ R of the strain monitoring module is Δ R1- Δ R2, i.e. the resistivity change of the sensor caused by the strain of the concrete structure. And finally, comparing the established relation curve or relation between the strain and the resistivity change of the cement-based intelligent composite material sensor to realize strain monitoring of the concrete structure at various environmental temperatures.
The above description is only one embodiment of the present invention, and not all or only one embodiment, and any equivalent alterations to the technical solutions of the present invention, which are made by those skilled in the art through reading the present specification, are covered by the claims of the present invention.
Claims (7)
1. The cement-based intelligent composite material strain sensor with the temperature compensation function is characterized by comprising a strain monitoring module (1) and a temperature monitoring module (2), wherein the strain monitoring module (1) is connected with the temperature monitoring module (2), the strain monitoring module (1) and the temperature monitoring module (2) are both composed of a carbon fiber cement basic intelligent composite material and four parallel electrodes (3) arranged on the composite material, the shapes of the strain monitoring module (1) and the temperature monitoring module (2) are cuboids, and the electrodes (3) are arranged perpendicular to the longest side of the cuboids and are symmetrical left and right; the outer surface of the temperature monitoring module (2) is coated with a flexible cement-based material (4), and the coating thickness of the flexible cement-based material is greater than 3.0% of the longest edge of the temperature monitoring module (2).
2. The cement-based intelligent composite strain sensor with temperature compensation function as claimed in claim 1,
the carbon fiber cement basic intelligent composite material is mainly prepared from the following components in percentage by mass (0.001-0.01): 1 PAN-based chopped carbon fiber and portland cement;
or,
the carbon fiber cement basic intelligent composite material is mainly prepared from the following components in percentage by mass (0.001-0.01): 1: (0.5-3.0) PAN-based chopped carbon fiber, Portland cement and quartz sand.
3. The cement-based smart composite strain sensor with temperature compensation function according to claim 1, characterized in that the electrode (3) is a high-purity copper mesh.
4. The cement-based intelligent composite strain sensor with temperature compensation function according to claim 1, wherein the ratio of the elastic modulus of the flexible cement-based material (4) to the temperature monitoring module (2) is (0.05-0.1): 1.
5. the cement-based intelligent composite material strain sensor with temperature compensation function according to claim 1, characterized in that the strain monitoring module (1) and the temperature monitoring module (2) are connected by using a flexible cement-based material (4).
6. The cement-based intelligent composite strain sensor with temperature compensation function as claimed in claim 1,
the flexible cement-based material (4) is mainly prepared from the following components in percentage by mass of 1: (0.02-0.80): 0.01 of Portland cement, alkali-resistant latex powder and a water reducing agent;
or,
the flexible cement-based material (4) is mainly prepared from the following components in percentage by mass of 1: (0.02-0.80): 0.01 of Portland cement, polymer emulsion and water reducing agent;
or,
the flexible cement-based material (4) is mainly prepared from the following components in percentage by mass of 1: (0.02-0.80): 0.01: (0.5-2.0) consisting of portland cement, alkali-resistant latex powder, a water reducing agent and quartz sand;
or
The flexible cement-based material (4) is mainly prepared from the following components in percentage by mass of 1: (0.02-0.80): 0.01: (0.5-2.0) of portland cement, polymer emulsion, a water reducing agent and quartz sand;
wherein the polymer emulsion is calculated by solid content.
7. The cement-based intelligent composite strain sensor with temperature compensation function according to claim 1, wherein each electrode (3) is provided with a lead wire.
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| CN108645332A (en) * | 2018-05-12 | 2018-10-12 | 哈尔滨工业大学 | A kind of cement base erosive wear sensor with temperature, humidity self-compensating function |
| CN109883315B (en) * | 2019-03-22 | 2021-01-01 | 中国科学院力学研究所 | Double-sided resistance type strain sensor and strain measurement method |
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