CN102506692A - Cement-based intelligent composite material strain sensor and preparation method thereof - Google Patents
Cement-based intelligent composite material strain sensor and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a cement-based intelligent composite material strain sensor, which comprises a carbon-fiber cement-based intrinsic intelligent composite material and four parallel electrodes arranged on the composite material, wherein the electrodes are high-purity copper meshes; the pore diameter of the high-purity copper meshes is larger than 2mm; and the main ingredients of the composite material are PAN-based short-cut carbon fiber and silicate cement, and the electrodes are combined together with the carbon-fiber cement-based intrinsic intelligent composite material by an embedding process. The cement-based intelligent composite material strain sensor has the characteristics of high sensitivity coefficient, high voltage-sensitive characteristic linearity and excellent mechanical property; and the preparation process adopts a drying and mixing process, so that the problems that due to use of cellulose, the strength of the sensor is reduced and the electric performance of the sensor becomes poor are avoided and no phenomenon of fiber agglomeration occurs.
Description
Technical field
The present invention relates to sensor technical field, particularly relate to a kind of cement based intelligent compound substance strain transducer and preparation method thereof, this strain transducer is used for civil engineering work xoncrete structure strain monitoring.
Background technology
At present in the civil engineering structure; Widely-used resistance strain gage is monitored the strain of xoncrete structure; Ripe, the reliable and stable advantage that possesses skills, but the foil gauge sensitivity coefficient is merely 2-3, and permanance is very poor; And mounting process is complicated, cost is higher, can't satisfy the technical need to the life-cycle long term monitoring of important civil engineering structure to people.And cement based intelligent compound substance strain transducer has the sensitivity coefficient height; Fabulous permanance; Advantage with low cost; And installation technics and data acquisition are simple, are the important means of important civil engineering work xoncrete structure long term monitoring such as Longspan Bridge, water conservancy dykes and dams, high-rise building and the main direction of strain transducer development.
Cement based intelligent compound substance strain transducer preparation technology's is immature at present; Comprehensive mechanical property is relatively poor; And the higher defective of fragility; Be still and cause sensor bulk resistivity poor stability, main cause that the pressure-sensitive character linearity is not high, having a strong impact on the application and the development of cement based intelligent compound substance strain transducer.Adopt various processes to prepare the xoncrete structure monitoring with cement based intelligent composite strain transducer; Avoid the strain transducer-resistivity linear dependence difference and the resistivity fluctuation that cause owing to material property or preparation method's reason; Improve the sensitivity coefficient and the resistivity stability of cement based intelligent compound substance strain transducer, become one of key content of current cement based intelligent compound substance strain transducer preparing technical field research.
The Chinese patent of document 1 " patent No. is ZL 02132967.2 " discloses a kind of clever concrete sensor component.This sensing element constitutes by having the test block of 1-2 to electrode, and the test block material is made up of carbon fibre and cement-based material, and sensor construction is simple, and tension and compressive stress are all had strain sensitivity.But this sensing element resistivity and stress in elastic range present nonlinear correspondence relation, and the variation relation of its strain and resistivity does not provide the measurement accuracy when influencing this sensing element as concrete strain sensor yet.
The Chinese patent of document 2 " application number is 200510031313.4 " discloses a kind of intelligent concrete test block and secondary thereof three times or two and has done a wet method for making; And use the electric performance test parameter of capacitance as stress, strain transducer, have the characteristics of compressive stress reaction sensitivity, individual data stable testing.But this intelligent concrete sensor under low-stress state (＜4MPa), the growth rate specific stress growth rate of stress capacitance is fast, is non-linear growth, has a strong impact on xoncrete structure monitoring accuracy under the low-stress state.
The Chinese patent of document 3 " patent No. is ZL 03128010.2 " discloses a kind of high sensitivity carbon-fiber cement base resistance-strain sensor-based system that contains temperature compensation.Carbon-fiber cement base intelligent composite is laid at the upper and lower surfaces of normal concrete beams by this system, forms sandwich construction, measures beams of concrete through the differential circuit of measuring symmetrical surface up and down and carries the degree that occurs bending and deformation.The influence of environment temperature has been eliminated by this strain sensing system; Improved the strain sensitive stability of cement based intelligent compound substance strain transducer; And has high strain-resistance susceptibility; The flexural deformation monitoring that but this sensing system is formed structure and installation technics is complicated, can only be used for beams of concrete has limited the application of this cement based intelligent compound substance strain transducer.
The Chinese patent of document 4 " application number is 200510057227.0 " discloses a kind of utilization and has contained slag and the flyash of the ferriferous oxide sensitive concrete as conductive phase.This sensitive concrete has salvaging, stress sensitivity is high, mechanical property is good and the simple advantage of preparation technology; But because the undulatory property of the otherness of process for making and each department raw material, generating plant electricity coal composition; Cause the ferriferous oxide content fluctuation in slag and the flyash very common; Cause the fluctuation of resistivity and voltage-dependent characteristic of this sensitive concrete also bigger, have a strong impact on the stability of utilizing the strain transducer that this sensitive concrete makes.
Document 5 (" B.G.Han, X.C.Guan, J.P.Ou, Sensors and Actuators A, 2007,135:360-369 ") discloses a kind of carbon fibre that utilizes and has been cement based intelligent compound substance strain transducer of conductive phase and preparation method thereof.This cement based intelligent compound substance strain transducer stress sensitivity is high, and mechanical property is better, and electric conduction of carbon fiber is evenly distributed in the cement based intelligent compound substance.But but there are other drawbacks in its preparation process: on the one hand; This strain transducer prepares in the process; Owing to use methylcellulose to cause carbon-fiber cement mixture viscosity to increase; Causing to obtaining necessary cast flowability increases the mixing water amount, reduces the intensity of final cement based intelligent compound substance and strain transducer thereof; On the other hand; Methylcellulose also can remain in the carbon-fiber cement based composites; The one deck of formation at the interface insulation macromolecule layer at carbon fibre and cement stone; Increase the fluctuation range of final composite material resistance rate, influence the resistivity and the voltage-dependent characteristic stability of cement based intelligent compound substance strain transducer.
The Chinese patent of document 6 " application number is 200710072165.X " discloses a kind of xoncrete structure local detection pressure sensitive cement base stress, strain transducer; Constitute by four parallel to each other being fixed in the pressure-sensitive cement sill of mesh electrode, have highly sensitive, good endurance, characteristics that embedding survival rate is high.But this sensor pressure-sensitive cement sill is by chopped carbon fiber, carbon fiber powder or carbon black or two or three forming wherein; And the adding of carbon fiber powder and carbon black tends to cause the cement based intelligent composite materials property to reduce; And then influence the voltage-dependent characteristic of sensor; And this sensor is a shape of a saddle shape, only can be used for the detection of some part of xoncrete structure.
It is the pressure-sensitive cement-base composite material of major function component with the nickel powder that the Chinese patent of document 7 " patent No. is ZL 200710072474.7 " discloses a kind of, and it is low and receive defectives such as humidity effect is big, matrix polarization being prone to influence electrical signal test to have solved power-coupling effect sensitivity that existing pressure-sensitive cement sill exists.But in this pressure-sensitive cement-base composite material, higher nickel powder content can cause preparing process mixing water amount to be increased, and reduces the comprehensive mechanical property of pressure-sensitive cement-base composite material and strain transducer thereof.
Summary of the invention
In order to overcome the deficiency of above-mentioned prior art; The object of the present invention is to provide a kind of cement based intelligent compound substance strain transducer and preparation method thereof; This strain transducer has the characteristics of sensitivity coefficient height, pressure-sensitive character linearity height, sensor mechanics function admirable; The preparation process adopts dry mixed technology, has avoided cellulose to use the sensor intensity of bringing to reduce and the problem of electric property variation, and has not had the fiber agglomeration.
To achieve these goals, the technical scheme of the present invention's employing is:
A kind of cement based intelligent compound substance strain transducer is levied intelligent composite and four parallel poles being arranged on the said compound substance are formed basically by carbon-fiber cement.
Said electrode is high-purity copper mesh, and the aperture of high-purity copper mesh is preferably 2-5mm greater than 2mm, levies intelligent composite basically through pre-buried technology and carbon-fiber cement and combines.
Said carbon-fiber cement is levied intelligent composite basically and mainly is (0.001～0.01) by mass ratio: 1 PAN base chopped carbon fiber and portland cement are formed;
Perhaps; Said carbon-fiber cement is levied intelligent composite basically and mainly is (0.001～0.01) by mass ratio: 1: PAN base chopped carbon fiber, portland cement and the aggregate of (0.5～3.0) are formed, and said aggregate is the potpourri of silica sand or the rational multiple particle size range silica sand of grating.
Said strain transducer profile is rectangular parallelepiped or right cylinder, and four plate electrodes are arranged perpendicular to rectangular parallelepiped longest edge or right cylinder bus, and four plate electrode left-right symmetric.
The method of said cement based intelligent compound substance strain transducer may further comprise the steps:
The first step, according to the profile of the strain transducer that will make, in corresponding mould, putting into four parallel poles;
In second step, the cast carbon-fiber cement is levied intelligent composite, curing molding basically in mould.
Said carbon-fiber cement is levied intelligent composite basically and mainly is (0.001～0.01) by mass ratio: 1 PAN base chopped carbon fiber and portland cement are formed;
Perhaps, said carbon-fiber cement levy basically intelligent composite mainly by mass ratio for (0.001～0.01): 1: PAN base chopped carbon fiber, portland cement and the aggregate of (0.5～3.0) are formed.
Said PAN base chopped carbon fiber adopts dry dispersing technology, at first in homo-mixer, is broken up into the monofilament state, mixes at the stirring machine inner drying with portland cement then, adds water at last and stirs and make carbon-fiber cement and levy intelligent composite basically;
Perhaps; Said PAN base chopped carbon fiber adopts dry dispersing technology; At first in homo-mixer, be broken up into the monofilament state, mix at the stirring machine inner drying with portland cement and aggregate then, add water at last and stir and to make carbon-fiber cement and levy intelligent composite basically.
Above-mentioned after the stirring machine inner drying mixes, add the polycarboxylate water-reducer of used portland cement quality 0.2-1.3%, the economization agent of 1-6% and the water of 25-45%.With mechanical property, the pressure-sensitive character linearity that improves final cement based intelligent compound substance strain transducer, reduce internal tiny crack.
Compared with prior art, the invention has the beneficial effects as follows:
1) cement based intelligent compound substance strain transducer of the present invention; The cement based intrinsic intelligent composite that forms with PAN base chopped carbon fiber and cementitious composite is a basic material, has the characteristics of sensitivity coefficient height, pressure-sensitive character linearity height, sensor mechanics function admirable.The adding of PAN base carbon fibre; Not only given cement-based material good pressure-sensitive character; The mechanical property of the cement based intelligent compound substance strain transducer that improves; And suppressed the generation and the expansion of pulsating stress effect lower sensor internal tiny crack, made cement based intelligent compound substance strain transducer have good pressure-sensitive character.
2) sensor of the present invention prepares process owing to adopted dry mixed technology; Directly with the chopped carbon fiber of monofilament state with the cement powder dry mixed even after; Add water again and prepare cement based intelligent compound substance sensor; The sensor intensity of having avoided cellulose to use bringing reduces and the problem of electric property variation, and carbon fibre is uniformly dispersed in cement matrix, does not have a fiber agglomeration.
3) the preparation process of sensor of the present invention adopts high-efficiency water-reducing agent of poly-carboxylic acid, economization agent and rational quartz sand graduation; Help the raising of strain transducer comprehensive mechanical property; Reduce internal tiny crack; Improve carbon fibre and combine, improve the strain transducer sensitivity coefficient and the pressure-sensitive character linearity with interface between the cement stone, and the range ability during raising sensor determination stress.
Description of drawings
Fig. 1 is that cement based intelligent compound substance strain transducer of the present invention prepares process flow diagram flow chart.
Fig. 2 is cement based intelligent compound substance strain transducer of the present invention (rectangular parallelepiped profile) structural representation, and dashed rectangle is represented electrode, and rectangular parallelepiped is represented strain transducer, has lead to draw on inboard two electrodes, and two electrodes in the outside connect constant voltage source.
Fig. 3 is cement based intelligent compound substance strain transducer of the present invention (cylindrical shape) structural representation, and broken circle is represented electrode, and right cylinder is represented strain transducer, has lead to draw on inboard two electrodes, and two electrodes in the outside connect constant voltage source.
Fig. 4 is the strain of cement based intelligent compound substance strain transducer of the present invention and the relation curve of resistance change rate.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is explained further details.
Embodiment 1
With reference to Fig. 1, Fig. 2; A kind of cement based intelligent compound substance strain transducer; Basically levy intelligent composite and four parallel high-purity copper net electrodes being arranged on the said compound substance are formed by carbon-fiber cement; The aperture of high-purity copper mesh is greater than 2mm, and compound substance is that mass ratio is 0.001: 1 PAN base chopped carbon fiber and a portland cement potpourri, and the strain transducer profile is a rectangular parallelepiped.
Its preparation process is such:
At first prepare the steel die that die cavity is a rectangular parallelepiped, and with four high-purity copper mesh perpendicular to the rectangular parallelepiped longest edge, be parallel to each other the symmetry be fixed in the mould.
Then; According to mass ratio is 0.001: 1 ratio, gets PAN base chopped carbon fiber and portland cement, utilizes to have to intersect the homo-mixer of elastomer blade; PAN base chopped carbon fiber is separated into the monofilament state, mixes at the stirring machine inner drying with Portland cement then.Add polycarboxylate water-reducer, 1 economization agent and 25% the water of used portland cement quality 0.2% again, and further stir and form the carbon-fiber cement mixture.
At last, the carbon-fiber cement mixture is poured in the steel die that is fixed with four high-purity copper net electrodes, and in mould curing molding, form cement based intelligent compound substance strain transducer, four high-purity copper net electrodes are drawn with lead.
Its method of application is such:
In four high-purity copper net electrodes, between two plate electrodes in the outside, apply DC voltage, inboard two plate electrodes are used to detect the change in voltage between inboard two electrodes.Cement based intelligent compound substance strain transducer is the input quantity of sensor perpendicular to the strain of four mesh electrode directions, and the voltage that inboard two plate electrodes detect is the output quantity of sensor.In the sensor use; Utilize current value and sensor geometric parameter; Change in voltage between detected inboard two plate electrodes is scaled the change in resistance of cement based intrinsic intelligent composite; And the cement based intelligent compound substance strain transducer set up of contrast and relation curve or the relational expression between the change in resistance, realize strain monitoring to xoncrete structure.
On the basis of xoncrete structure strain monitoring, utilize the modulus relation of cement based intrinsic intelligent composite, can realize the stress monitoring of cement based intelligent compound substance strain transducer to xoncrete structure.
With reference to Fig. 1, Fig. 2; A kind of cement based intelligent compound substance strain transducer; Basically levy intelligent composite and four parallel high-purity copper net electrodes being arranged on the said compound substance are formed by carbon-fiber cement; The aperture of high-purity copper mesh is greater than 2mm; Compound substance is that 0.004: 1: 0.5 PAN base chopped carbon fiber, portland cement potpourri and aggregate formed by mass ratio mainly, and aggregate is the potpourri of silica sand or the rational multiple particle size range silica sand of grating, and the strain transducer profile is a rectangular parallelepiped.
Its preparation process is such:
At first prepare the steel die that die cavity is a rectangular parallelepiped, and with four high-purity copper mesh perpendicular to the rectangular parallelepiped longest edge, be parallel to each other the symmetry be fixed in the mould.
Then; It according to mass ratio 0.004: 1: 0.5 ratio; Get PAN base chopped carbon fiber, portland cement potpourri and aggregate, utilize homo-mixer, utilize homo-mixer with intersection elastomer blade with intersection elastomer blade; PAN base chopped carbon fiber is separated into the monofilament state, mixes at the stirring machine inner drying with Portland cement then.Add polycarboxylate water-reducer, 6% economization agent and 45% the water of aggregate and used portland cement quality 1.3% again, and further stir and form the carbon-fiber cement mixture.
At last, the carbon-fiber cement mixture is poured in the steel die that is fixed with four high-purity copper net electrodes, and in mould curing molding, form cement based intelligent compound substance strain transducer, four high-purity copper net electrodes are drawn with lead.
Its method of application is such:
In four high-purity copper net electrodes, between two plate electrodes in the outside, apply steady current, inboard two plate electrodes are used to detect the change in voltage between inboard two electrodes.Cement based intelligent compound substance strain transducer is the input quantity of sensor perpendicular to the strain of four mesh electrode directions, and the voltage that inboard two plate electrodes detect is the output quantity of sensor.In the sensor use; Utilize current value and sensor geometric parameter; Change in voltage between detected inboard two plate electrodes is scaled the change in resistance of cement based intrinsic intelligent composite; And the cement based intelligent compound substance strain transducer set up of contrast and relation curve or the relational expression between the change in resistance, realize strain monitoring to xoncrete structure.
On the basis of xoncrete structure strain monitoring, utilize the modulus relation of cement based intrinsic intelligent composite, can realize the stress monitoring of cement based intelligent compound substance strain transducer to xoncrete structure.
Embodiment 3
With reference to Fig. 1, Fig. 3; A kind of cement based intelligent compound substance strain transducer; Basically levy intelligent composite and four parallel high-purity copper net electrodes being arranged on the said compound substance are formed by carbon-fiber cement; The aperture of high-purity copper mesh is greater than 2mm, and compound substance is that mass ratio is 0.006: 1 PAN base chopped carbon fiber and a portland cement potpourri, and the strain transducer profile is a right cylinder.
Its preparation process is such:
At first preparing die cavity is cylindrical steel die, and with four high-purity copper mesh perpendicular to the right cylinder bus, be parallel to each other the symmetry be fixed in the mould.
Then; According to mass ratio is 0.006: 1 ratio, gets PAN base chopped carbon fiber and portland cement, utilizes to have to intersect the homo-mixer of elastomer blade; PAN base chopped carbon fiber is separated into the monofilament state, mixes at the stirring machine inner drying with Portland cement then.Add polycarboxylate water-reducer, 2% economization agent and 32% the water of used portland cement quality 1.0% again, and further stir and form the carbon-fiber cement mixture.
At last, the carbon-fiber cement mixture is poured in the steel die that is fixed with four high-purity copper net electrodes, and in mould curing molding, form cement based intelligent compound substance strain transducer, four high-purity copper net electrodes are drawn with lead.
Its method of application is such:
In four high-purity copper net electrodes, between two plate electrodes in the outside, apply steady current, inboard two plate electrodes are used to detect the change in voltage between inboard two electrodes.Cement based intelligent compound substance strain transducer is the input quantity of sensor perpendicular to the strain of four mesh electrode directions, and the voltage that inboard two plate electrodes detect is the output quantity of sensor.In the sensor use; Utilize current value and sensor geometric parameter; Change in voltage between detected inboard two plate electrodes is scaled the change in resistance of cement based intrinsic intelligent composite; And the cement based intelligent compound substance strain transducer set up of contrast and relation curve or the relational expression between the change in resistance, realize strain monitoring to xoncrete structure.
On the basis of xoncrete structure strain monitoring, utilize the modulus relation of cement based intrinsic intelligent composite, can realize the stress monitoring of cement based intelligent compound substance strain transducer to xoncrete structure.
With reference to Fig. 1, Fig. 3; A kind of cement based intelligent compound substance strain transducer; Basically levy intelligent composite and four parallel high-purity copper net electrodes being arranged on the said compound substance are formed by carbon-fiber cement; The aperture of high-purity copper mesh is greater than 2mm; Compound substance is that 0.01: 1: 3 PAN base chopped carbon fiber, portland cement potpourri and aggregate formed by mass ratio mainly, and aggregate is the potpourri of silica sand or the rational multiple particle size range silica sand of grating, and the strain transducer profile is a right cylinder.
Its preparation process is such:
At first preparing die cavity is cylindrical steel die, and with four high-purity copper mesh perpendicular to the right cylinder bus, be parallel to each other the symmetry be fixed in the mould.
Then; It according to mass ratio 0.01: 1: 3 ratio; Get PAN base chopped carbon fiber, portland cement potpourri and aggregate, utilize homo-mixer, utilize homo-mixer with intersection elastomer blade with intersection elastomer blade; PAN base chopped carbon fiber is separated into the monofilament state, mixes at the stirring machine inner drying with Portland cement then.Add aggregate, polycarboxylate water-reducer, economization agent and water again, and the formation carbon-fiber cement mixture that further stirs.
At last, the carbon-fiber cement mixture is poured in the steel die that is fixed with four high-purity copper net electrodes, and in mould curing molding, form cement based intelligent compound substance strain transducer, four high-purity copper net electrodes are drawn with lead.
Its method of application is such:
In four high-purity copper net electrodes, between two plate electrodes in the outside, apply DC voltage, inboard two plate electrodes are used to detect the change in voltage between inboard two electrodes.Cement based intelligent compound substance strain transducer is the input quantity of sensor perpendicular to the strain of four mesh electrode directions, and the voltage that inboard two plate electrodes detect is the output quantity of sensor.In the sensor use; Utilize current value and sensor geometric parameter; Change in voltage between detected inboard two plate electrodes is scaled the change in resistance of cement based intrinsic intelligent composite; And the cement based intelligent compound substance strain transducer set up of contrast and relation curve or the relational expression between the change in resistance, realize strain monitoring to xoncrete structure.
On the basis of xoncrete structure strain monitoring, utilize the modulus relation of cement based intrinsic intelligent composite, can realize the stress monitoring of cement based intelligent compound substance strain transducer to xoncrete structure.
Consult shown in Figure 4, cement based intelligent compound substance strain transducer of the present invention, the relation curve of strain and resistance change rate is a linear relation, the pressure-sensitive character linearity of this strain transducer is very good.
The above is merely one embodiment of the present invention; It or not whole or unique embodiment; The conversion of any equivalence that those of ordinary skills take technical scheme of the present invention through reading instructions of the present invention is claim of the present invention and contains.
Claims (10)
1. a cement based intelligent compound substance strain transducer is characterized in that, levies intelligent composite basically and four parallel poles being arranged on the said compound substance are formed by carbon-fiber cement.
2. cement based intelligent compound substance strain transducer according to claim 1 is characterized in that said electrode is high-purity copper mesh.
3. cement based intelligent compound substance strain transducer according to claim 2 is characterized in that the aperture of said high-purity copper mesh is 2-5mm.
4. according to the described cement based intelligent compound substance of the arbitrary claim of claim 1 to 3 strain transducer, it is characterized in that:
Said carbon-fiber cement is levied intelligent composite basically and mainly is (0.001～0.01) by mass ratio: 1 PAN base chopped carbon fiber and portland cement are formed;
Perhaps,
Said carbon-fiber cement is levied intelligent composite basically and mainly is (0.001～0.01) by mass ratio: 1: PAN base chopped carbon fiber, portland cement and the aggregate of (0.5～3.0) are formed.
5. cement based intelligent compound substance strain transducer according to claim 4 is characterized in that, said aggregate is the potpourri of silica sand or the rational multiple particle size range silica sand of grating.
6. cement based intelligent compound substance strain transducer according to claim 1 is characterized in that said strain transducer profile is rectangular parallelepiped or right cylinder, and four plate electrodes are arranged perpendicular to rectangular parallelepiped longest edge or right cylinder bus, and four plate electrode left-right symmetric.
7. a method for preparing the described cement based intelligent compound substance of claim 1 strain transducer is characterized in that, may further comprise the steps:
The first step, according to the profile of the strain transducer that will make, in corresponding mould, putting into four parallel poles;
In second step, the cast carbon-fiber cement is levied intelligent composite, curing molding basically in mould.
8. preparation method according to claim 7 is characterized in that:
Said carbon-fiber cement is levied intelligent composite basically and mainly is (0.001～0.01) by mass ratio: 1 PAN base chopped carbon fiber and portland cement are formed;
Perhaps,
Said carbon-fiber cement is levied intelligent composite basically and mainly is (0.001～0.01) by mass ratio: 1: PAN base chopped carbon fiber, portland cement and the aggregate of (0.5～3.0) are formed.
9. preparation method according to claim 8 is characterized in that:
Said PAN base chopped carbon fiber adopts dry dispersing technology, at first in homo-mixer, is broken up into the monofilament state, mixes at the stirring machine inner drying with portland cement then, adds water at last and stirs and make carbon-fiber cement and levy intelligent composite basically;
Perhaps,
Said PAN base chopped carbon fiber adopts dry dispersing technology; At first in homo-mixer, be broken up into the monofilament state; Mix at the stirring machine inner drying with portland cement and aggregate then, add water at last and stir and to make carbon-fiber cement and levy intelligent composite basically.
10. preparation method according to claim 9 is characterized in that, after the stirring machine inner drying mixes, adds the polycarboxylate water-reducer of used portland cement quality 0.2-1.3%, the economization agent of 1-6% and the water of 25-45%.
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| CN104446176A (en) * | 2014-08-25 | 2015-03-25 | 北京建筑大学 | Cement-based composite material and pressure sensor made of same |
| CN106768052A (en) * | 2016-12-27 | 2017-05-31 | 江苏大学 | A kind of intelligent carbon fibre composite sensing element and preparation method thereof |
| CN109357795A (en) * | 2018-12-28 | 2019-02-19 | 吉林建筑大学 | A kind of cement base piezoelectric composite material sensor |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104446176A (en) * | 2014-08-25 | 2015-03-25 | 北京建筑大学 | Cement-based composite material and pressure sensor made of same |
| CN104446176B (en) * | 2014-08-25 | 2016-06-15 | 北京建筑大学 | A kind of cement-base composite material and voltage sensitive sensor thereof |
| CN106768052A (en) * | 2016-12-27 | 2017-05-31 | 江苏大学 | A kind of intelligent carbon fibre composite sensing element and preparation method thereof |
| CN106768052B (en) * | 2016-12-27 | 2023-12-15 | 江苏大学 | Intelligent carbon fiber composite sensing element and manufacturing method thereof |
| CN109357795A (en) * | 2018-12-28 | 2019-02-19 | 吉林建筑大学 | A kind of cement base piezoelectric composite material sensor |
| CN109357795B (en) * | 2018-12-28 | 2023-09-01 | 吉林建筑大学 | Cement-based piezoelectric composite material sensor |
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