CN105645847A - Carbon nanotube/carbon fiber-reinforced cement-based pressure-sensitive composite material and preparation method thereof - Google Patents
Carbon nanotube/carbon fiber-reinforced cement-based pressure-sensitive composite material and preparation method thereof Download PDFInfo
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- CN105645847A CN105645847A CN201511028076.6A CN201511028076A CN105645847A CN 105645847 A CN105645847 A CN 105645847A CN 201511028076 A CN201511028076 A CN 201511028076A CN 105645847 A CN105645847 A CN 105645847A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
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Abstract
The invention relates to a carbon nanotube/carbon fiber-reinforced cement-based pressure-sensitive composite material and a preparation method thereof, belonging to the technical fields of stress-strain monitoring of mass concrete, and traffic flow and load monitoring. According to the carbon nanotube/carbon fiber-reinforced cement-based pressure-sensitive composite material and the preparation method thereof, the linearity and the signal-noise ratio between the electrical resistivity of an existing cement-based pressure sensitive material and an external load response relationship as well as the repeatability that the electrical resistivity changes along with the load under the action of a cyclic loading are improved. The composite material is prepared from cement, silica fume, a conductive filler, a dispersing agent and water. The preparation method comprises the following steps of firstly, pre-dispersing carbon nanotubes and carbon fibers; secondly, adding the silica fume, the dispersing agent, a defoaming agent and water, and stirring to form a mixing material; thirdly, filling the mixing material into a die and embedding into electrodes to obtain test pieces; fourthly, placing the test pieces into a standard curing chamber for curing; finally, selecting two ends of the test pieces which are parallel to each another for polishing, removing surface laitance, smearing conductive silver paste, wrapping copper wires and the surfaces of the test pieces, which are coated with the conductive silver paste by using aluminum foils to obtain external electrodes, thereby preparing the composite material.
Description
Technical field
The present invention relates to the monitoring of mass concrete stress-strain, traffic flow and load monitoring technical field, in particular to a kind of carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material and preparation method.
Background technology
Under normal circumstances, the degree of impairment that monitoring is under CYCLIC LOADING or unloading effect concrete structure, mainly comprises two kinds of modes: one is be embedded into the sensor such as optical fiber, piezoelectric ceramics in concrete to monitor; Two is adopt acoustic emission technology to monitor. But, there is following defect in the first monitoring mode: the sensor imbedded in concrete more easily causes stress to concentrate and reduce the mechanical property of material, and owing to being limit buried position, it is difficult to monitor integrally-built deformation performance; Also there is drawback in the 2nd kind of monitoring mode: although structure can not be caused damage by acoustic emission technology, but is used instrument price costly, simultaneously bigger by extraneous factor interference.
In order to solve the problem, it is possible to mix the conductive components such as carbon fiber, graphite, slag, steel fiber in cement-based material and make it possess self-induction pressure-sensitive. Cement based pressure sensitive composite material under external force resistivity be the order of magnitude change, external force disappear after resistivity return to again initial value; And whole process is again reversible, thus based on cement-based material pressure-sensitive character, implanted and concrete can also be monitored concrete structure internal stress strained situation. But, all there is certain limitation in the pressure-sensitive materials application of existing cement based: its resistivity of carbon-fiber cement sill with the extraneous linear lag of loads change, the raising of signal to noise ratio and under cyclic load effect resistivity all there is certain difficulty with the repeatability control of loads change; Steel slag cement sill self-resistance value is big, simultaneously owing to containing a large amount of FeO sosoloid, easily producing polarization under electrical signal effect; Graphite cement sill, owing to graphite is scattered in cement matrix with particulate state, under low-dosage, conductive filler material is difficult to be overlapped to form conductive path, affects load and resistance associated response mechanism.
Carbon nanotube is as the nano level super fiber of one, mix in cement-based material with carbon fiber hybrid, nanometer and the collaborative reinforced composite mechanical property of micron two yardsticks and conductivity, improve presser sensor, for the Theories and methods providing new applied by the pressure-sensitive material of cement based as strain gauge in domain engineering such as mass concrete stress monitoring, traffic engineering vehicle flux monitor.
The information being disclosed in this background section only is intended to increase the understanding of the general background to the present invention, and should not be considered as admitting or imply that this information is the known prior aries of persons skilled in the art in any form.
Summary of the invention
It is an object of the invention to provide a kind of carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material and preparation method, for improve the linear lag of the pressure-sensitive resistivity of material of existing cement based and extraneous load response relation, signal to noise ratio and under cyclic load effect resistivity with the repeatability of loads change, be beneficial to the pressure-sensitive materials application of cement based in actual engineering.
For solving the problems of the technologies described above, the technical scheme of the present invention is as follows:
A kind of carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material, described carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material comprises: cement, silicon ash, carbon fiber, carbon fiber dispersion agent, carbon nanotube, Carbon nano-tube dispersant, defoamer and water, and the proportioning (g) of each composition is as follows:
Further, the mass ratio of described Carbon nano-tube dispersant and described carbon nanotube is (0.8��1.2): 1, and the mass ratio of described carbon fiber dispersion agent and described carbon fiber is (0.8��1.2): 1.
Further, described carbon nanotube diameter is 8��20 nanometers, and length is 30��100 microns; Described carbon fiber diameter is 5��20 microns, and length is 3��5 millimeters.
Further, the mass ratio of described carbon nanotube and carbon fiber is: (0.25��5): 1.
Further, it is 0.1% that described carbon nanotube accounts for described cement quality per-cent, and it is 0.4% that described carbon fiber accounts for described cement quality per-cent.
Further, it is 0.2% that described carbon nanotube accounts for described cement quality per-cent, and it is 0.4% that described carbon fiber accounts for described cement quality per-cent.
Further, it is 0.5% that described carbon nanotube accounts for described cement quality per-cent, and it is 0.4% that described carbon fiber accounts for described cement quality per-cent.
Further, the volume of described silicon ash accounts for the mass percent of described cement is 1��10%.
The invention also discloses the preparation method of a kind of carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material, comprise the steps:
Step one, moisture becomes trisection for subsequent use, by carbon nanotube and Carbon nano-tube dispersant in proportion 1:1 add in 1/3 water and carbon nano tube suspension is made in process further; Carbon fiber and carbon fiber dispersion agent are added in proportion in 1/3 water simultaneously and process obtained carbon fiber suspended dispersed liquid further;
Step 2, in agitator kettle, add silicon ash, cement and defoamer successively and described carbon nano tube suspension, carbon fiber suspended dispersed liquid and remaining 1/3 water and stir certain time and obtain mixing and stirring material;
Step 3, the described material that mixes and stirs is loaded in test mould, and imbed one pair of stainless (steel) wire electrode in described test mould symmetry axis zygomorphy, thus obtain test specimen;
Step 4, described test specimen be positioned over temperature be 22 �� 3 DEG C, relative humidity be 95% �� 3% standard curing room in maintenance certain length of time;
Step 5, the different order sand papering of employing remove the laitance of test specimen two end surfaces, and smear one layer of conductive silver paste at the test specimen two ends polished, with aluminium foil, copper cash and the surface that scribbles conductive silver paste are wrapped again, it is made into outer electrode, thus obtains described carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material.
Further, in described step one, process comprises further:
The first step, manually stirs 2��5 minutes;
2nd step, adopts magnetic stirrer heated and stirred 10��20 minutes;
3rd step, supersound process 40��50 minutes.
Compared with prior art, the technique effect that the present invention is useful is:
One, a kind of carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material provided by the invention, comprising: cement, silicon ash, carbon fiber, carbon fiber dispersion agent, carbon nanotube, Carbon nano-tube dispersant, defoamer and water, the proportioning (g) of each composition is as follows: cement 80��100, silicon ash 1��10, carbon fiber 0.1��0.6, carbon fiber dispersion agent 0.1��0.6, carbon nanotube 0.1��2.0, Carbon nano-tube dispersant 0.1��2.0, defoamer 0.05��0.15, water 30��45. This carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material take cement as gelling material, and silicon ash is mineral admixture, and carbon nanotube, carbon fiber are conductive filler material, and adds the pressure-sensitive material of functional cement based that associate conductive filler dispersion agent is composited. Carbon nanotube and chopped carbon fiber evenly are distributed in cement by this carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material. This carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material improve the linear lag of the pressure-sensitive resistivity of material of existing cement based and extraneous load response relation, signal to noise ratio and under cyclic load effect resistivity with the repeatability of loads change, be conducive to the pressure-sensitive materials application of cement based in actual engineering.
Two, the preparation method of this carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material, first carries out pre-dispersed respectively by carbon nanotube and carbon fiber in water, obtains carbon nano tube suspension and carbon fiber suspended dispersed liquid; Next adds silicon ash, defoamer and water stir to make and mixes and stirs material; Then will mix and stir material to load in test mould, and obtain test specimen imbedding one pair of stainless (steel) wire electrode apart from this mould symmetry axis center equidistant; Then test specimen is put into standard curing room maintenance certain length of time; Finally choose in test specimen be positioned at the smooth two ends being parallel to each other polish and remove surface laitance, smear conductive silver paste, with aluminium foil, copper cash and the surface of test piece scribbling conductive silver paste are wrapped up again, make outer electrode, thus obtain carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material. This preparation method draws materials conveniently, easy and simple to handle, has good promotional value.
Accompanying drawing explanation
Fig. 1 is the structural representation of the carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material of the embodiment of the present invention one;
Fig. 2 mixes 0.4wt.% carbon fiber reinforced cement base pressure sensitive composite material to repeat to add resistance change rate and stress variation relation schematic diagram in time under unloading in control group;
Fig. 3 is that answering of the embodiment of the present invention two is mixed 0.4wt.% carbon fiber and 0.1wt.% carbon nanotube cement based pressure sensitive composite material and repeated to add resistance change rate and stress variation relation schematic diagram in time under unloading;
Fig. 4 is that answering of the embodiment of the present invention three is mixed 0.4wt.% carbon fiber and 0.2wt.% carbon nanotube cement based pressure sensitive composite material and repeated to add resistance change rate and stress variation relation schematic diagram in time under unloading;
Fig. 5 is that answering of the embodiment of the present invention four is mixed 0.4wt.% carbon fiber and 0.5wt.% carbon nanotube cement based pressure sensitive composite material and repeated to add resistance change rate and stress variation relation schematic diagram in time under unloading.
Embodiment
Carbon nanotube/carbon fiber reinforced cement base the pressure sensitive composite material and the preparation method that the present invention are proposed below in conjunction with the drawings and specific embodiments are described in further detail.According to the following describes and claim book, advantages and features of the invention will be clearer. It should be noted that, accompanying drawing all adopts the form simplified very much and all uses non-ratio accurately, only in order to object convenient, the distinct ground aid illustration embodiment of the present invention. For sake of convenience, hereinafter described " on ", D score consistent with the upper and lower direction of accompanying drawing, but this can not become the restriction of technical solution of the present invention.
The present invention provides a kind of carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material and preparation method, and this carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material is applicable to the monitoring of mass concrete stress-strain, traffic engineering load and the flow monitorings such as civil engineering work, hydro project, coastal waters and oceanographic engineering structure.
Carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material and the preparation method of the present invention are described in detail below in conjunction with Fig. 1 to Fig. 5. Wherein Fig. 2 mixes 0.4wt.% carbon fiber reinforced cement base pressure sensitive composite material to repeat to add resistance change rate and stress variation relation schematic diagram in time under unloading in control group and prior art. In this carbon fiber reinforced cement base pressure sensitive composite material, it is 0.4% that carbon fiber accounts for cement quality per-cent.
Embodiment one
Carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material, comprising: cement, silicon ash, carbon fiber, carbon fiber dispersion agent, carbon nanotube, Carbon nano-tube dispersant, defoamer and water, and the proportioning ratio (mass ratio g) of each composition is as follows:
Wherein, the mass ratio of Carbon nano-tube dispersant and carbon nanotube is (0.8��1.2): 1, and the mass ratio of carbon fiber dispersion agent and carbon fiber is (0.8��1.2): 1. The mass ratio of carbon nanotube and carbon fiber is: (0.25��5): 1. Carbon nanotube diameter is 8��20 nanometers, and length is 30��100 microns; Carbon fiber diameter is 5��20 microns, and length is 3��5 millimeters.
The carbon nanotube of the present invention/carbon fiber reinforced cement base pressure sensitive composite material take cement as gelling material, silicon ash is mineral admixture, carbon nanotube, carbon fiber are conductive filler material, and add the pressure-sensitive material of functional cement based that associate conductive filler dispersion agent (i.e. carbon fiber dispersion agent and Carbon nano-tube dispersant) is composited. Carbon nanotube and chopped carbon fiber evenly are distributed in cement-based material by this carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material. Due to mechanics, the electric property of carbon nanotube excellence and the nanoscopic network structure having action of crack arrest and electric action concurrently can be formed in cement matrix, carbon nanotube prepared by itself and carbon fiber multi-dimension mixing/carbon fiber reinforced cement base pressure sensitive composite material resistance to compression and tensile splitting strength height; Basal body structure is closely knit; The linear lag of resistance and extraneous load response relation, signal to noise ratio are higher than carbon-fiber cement sill, steel slag cement sill and sooty water cement-based material; Under cyclic load effect, resistivity is strong with the repeatability of loads change.
For meet carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material military service stability and under cyclic load effect resistivity with the repeatability of loads change, improving use properties, the mass ratio of carbon nanotube and carbon fiber is: (0.25��5): 1. Certainly can be cement as cement-based material, it is also possible to being the mixing material of cement and fine aggregate, the particle diameter of general fine aggregate is 5��20 millimeters.
Correspondingly, as shown in Figure 1, the present embodiment additionally provides the preparation method of the carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material of the present invention, comprises the steps:
S001: become trisection for subsequent use moisture, by carbon nanotube and Carbon nano-tube dispersant in proportion 1:1 add in 1/3 water and carbon nano tube suspension is made in process further;Simultaneously by carbon fiber and carbon fiber dispersion agent (such as methylcellulose gum) in proportion 1:1 add in 1/3 water and the obtained carbon fiber suspended dispersed liquid of process further.
S002: add silicon ash, cement and defoamer (such as tributyl phosphate) and carbon nano tube suspension, carbon fiber suspended dispersed liquid and remaining 1/3 water in agitator kettle successively and stir certain time, be generally 3 minutes, obtain mixing and stirring material. Wherein, silicon ash serves the effect of dispersion agent.
S003: material will be mixed and stirred and load in test mould, and imbed one couple of stainless (steel) wire electrode B, C in test mould symmetry axis zygomorphy, thus obtain test specimen.
S004: test specimen is positioned over that temperature is 22 �� 3 DEG C, relative humidity be 95% �� 3% standard curing room in maintenance certain length of time.
S005: choose the two ends being located along the same line that test specimen is more smooth, different order sand papering is adopted to remove the laitance of test specimen two end surfaces, so that carbon fiber exposing surface, and smear one layer of conductive silver paste at the test specimen two ends polished, with aluminium foil, copper cash and the surface that scribbles conductive silver paste are wrapped up again, being made into outer electrode, copper cash A, D are as wire, thus obtain carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material. Outer electrode is conducive to the contact resistance reduced between wire and test specimen.
Goodly, in step S001, process comprises further: the first step, manually stirs 2��5 minutes; 2nd step, adopts magnetic stirrer heated and stirred 10��20 minutes; 3rd step, supersound process 40��50 minutes. That is, making carbon nano tube suspension is consistent with the reaction environment of making carbon fiber suspended dispersed liquid.
Goodly, step S003 also comprises and test specimen is plugged and pounded closely knit, get rid of unnecessary bubble, floating, thus contribute to keeping the stability of outer electrode.
Making the shaping and maintenance carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material to certain length of time, adopt four electrode method to test it at elastic stage, resistance is with different extraneous pressure reactive force variation relation curve. Wherein, in test control group, the volume of carbon fiber is 0.4wt.%.
Control group
As shown in Figure 2, a kind of carbon fiber reinforced cement base pressure sensitive composite material, not carbon nanotubes, the volume of carbon fiber is 0.4wt.%, and namely carbon fiber accounts for cement quality per-cent is 0.4%.
Embodiment two
As shown in figures 1 and 3, a kind of carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material, it is 0.1% that carbon nanotube accounts for cement quality per-cent, and it is 0.4% that carbon fiber accounts for cement quality per-cent.
Embodiment three
As shown in Figure 1 and Figure 4, a kind of carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material, it is 0.2% that carbon nanotube accounts for cement quality per-cent, and it is 0.4% that carbon fiber accounts for cement quality per-cent.
Embodiment four
As shown in Figure 1 and Figure 5, a kind of carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material, it is 0.5% that carbon nanotube accounts for cement quality per-cent, and it is 0.4% that carbon fiber accounts for cement quality per-cent.
In conjunction with comparison diagram 2 to Fig. 5 it will be seen that Fig. 2 be carbon-fiber cement pressure sensitive composite material fixing add lotus amplitude CYCLIC LOADING under, the relative change of resistance and the relation of load. Under little stress, owing to elasticity distortion can repeat, in each working cycle, during loading, resistivity increases with load and reduces; When unloaded, resistivity increases, and resistivity relatively changes and adds and has obvious corresponding relation between lotus.Similar with Fig. 2, Fig. 3, Fig. 4, Fig. 5 resistivity relatively changes and adds and has obvious corresponding relation between lotus. But during compression and decompression, resistivity is obviously strengthened with the linear lag of loads change, and signal to noise ratio is improved significantly. Therefore, carbon nanotube mix the pressure-sensitive that improve cement-base composite material.
In sum, the carbon nanotube of the embodiment of the present invention/carbon fiber reinforced cement base pressure sensitive composite material, using cement as gelling material, silicon ash as mineral admixture, carbon nanotube, carbon fiber are conductive filler material, and add the pressure-sensitive material of functional cement based that associate conductive filler dispersion agent is composited. Carbon nanotube and chopped carbon fiber evenly are distributed in cement-based material by this carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material. This carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material can be applicable in the fields such as the monitoring of mass concrete stress-strain, traffic engineering load and flow monitoring such as civil engineering work, hydro project, coastal waters and oceanographic engineering structure. This carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material improve the linear lag of the pressure-sensitive resistivity of material of existing cement based and extraneous load response relation, signal to noise ratio and under cyclic load effect resistivity with the repeatability of loads change, be conducive to the pressure-sensitive materials application of cement based in actual engineering.
Foregoing description is only the description to the better embodiment of the present invention, not to any restriction of the scope of the invention. Any change that the those of ordinary skill in field of the present invention does according to above-mentioned disclosure, modification, all belong to the protection domain of claim book.
Claims (10)
1. carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material, it is characterized in that, described carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material comprises: cement, silicon ash, carbon fiber, carbon fiber dispersion agent, carbon nanotube, Carbon nano-tube dispersant, defoamer and water, and the proportioning (g) of each composition is as follows:
2. carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material as claimed in claim 1, it is characterized in that, the mass ratio of described Carbon nano-tube dispersant and described carbon nanotube is (0.8��1.2): 1, and the mass ratio of described carbon fiber dispersion agent and described carbon fiber is (0.8��1.2): 1.
3. carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material as claimed in claim 1, it is characterised in that, described carbon nanotube diameter is 8��20 nanometers, and length is 30��100 microns; Described carbon fiber diameter is 5��20 microns, and length is 3��5 millimeters.
4. carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material as claimed in claim 2, it is characterised in that, the mass ratio of described carbon nanotube and carbon fiber is: (0.25��5): 1.
5. carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material as claimed in claim 4, it is characterised in that, it is 0.1% that described carbon nanotube accounts for described cement quality per-cent, and it is 0.4% that described carbon fiber accounts for described cement quality per-cent.
6. carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material as claimed in claim 4, it is characterised in that, it is 0.2% that described carbon nanotube accounts for described cement quality per-cent, and it is 0.4% that described carbon fiber accounts for described cement quality per-cent.
7. carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material as claimed in claim 4, it is characterised in that, it is 0.5% that described carbon nanotube accounts for described cement quality per-cent, and it is 0.4% that described carbon fiber accounts for described cement quality per-cent.
8. carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material as claimed in claim 1, it is characterised in that, it is 1��10% that the volume of described silicon ash accounts for the mass percent of described cement.
9. the preparation method of carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material as described in item as arbitrary in claim 1 to 8, it is characterised in that, comprise the steps:
Step one, moisture becomes trisection for subsequent use, by carbon nanotube and Carbon nano-tube dispersant in proportion 1:1 add in 1/3 water and carbon nano tube suspension is made in process further; Carbon fiber and carbon fiber dispersion agent are added in proportion in 1/3 water simultaneously and process obtained carbon fiber suspended dispersed liquid further;
Step 2, in agitator kettle, add silicon ash, cement and defoamer successively and described carbon nano tube suspension, carbon fiber suspended dispersed liquid and remaining 1/3 water and stir certain time and obtain mixing and stirring material;
Step 3, the described material that mixes and stirs is loaded in test mould, and imbed one pair of stainless (steel) wire electrode in described test mould symmetry axis zygomorphy, thus obtain test specimen;
Step 4, described test specimen be positioned over temperature be 22 �� 3 DEG C, relative humidity be 95% �� 3% standard curing room in maintenance certain length of time;
Step 5, the different order sand papering of employing remove the laitance of test specimen two end surfaces, and smear one layer of conductive silver paste at the test specimen two ends polished, with aluminium foil, copper cash and the surface that scribbles conductive silver paste are wrapped again, it is made into outer electrode, thus obtains described carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material.
10. the preparation method of carbon nanotube/carbon fiber reinforced cement base pressure sensitive composite material as claimed in claim 9, it is characterised in that, in described step one, process comprises further:
The first step, manually stirs 2��5 minutes;
2nd step, adopts magnetic stirrer heated and stirred 10��20 minutes;
3rd step, supersound process 40��50 minutes.
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| CN109761559A (en) * | 2019-02-27 | 2019-05-17 | 中交高新科技产业发展有限公司 | The composite material and preparation method with monitoring is conserved for bridge concrete structure |
| CN111678955A (en) * | 2020-06-17 | 2020-09-18 | 中铁二院重庆勘察设计研究院有限责任公司 | Pressure-sensitive performance detection equipment for carbon nanotube concrete |
| CN111829700A (en) * | 2020-07-21 | 2020-10-27 | 重庆交通大学 | Semiconductor sensing fiber for detecting carbon nanofiber reinforced asphalt resistance stress, fiber interface sensing device and detection method thereof |
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| CN108706918A (en) * | 2018-04-28 | 2018-10-26 | 长江大学 | A kind of liquid fiber toughening material and its preparation method and application |
| CN108706918B (en) * | 2018-04-28 | 2021-02-02 | 长江大学 | Liquid fiber toughening material and preparation method and application thereof |
| CN109761559A (en) * | 2019-02-27 | 2019-05-17 | 中交高新科技产业发展有限公司 | The composite material and preparation method with monitoring is conserved for bridge concrete structure |
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| CN111829700A (en) * | 2020-07-21 | 2020-10-27 | 重庆交通大学 | Semiconductor sensing fiber for detecting carbon nanofiber reinforced asphalt resistance stress, fiber interface sensing device and detection method thereof |
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| CN111995314B (en) * | 2020-08-26 | 2021-12-10 | 山东交通学院 | Method for bridge detection and monitoring and composite material used in method |
| CN112160240A (en) * | 2020-10-23 | 2021-01-01 | 同济大学 | Stress damage self-induction concrete bridge deck and manufacturing method |
| CN112697584A (en) * | 2020-12-07 | 2021-04-23 | 北京建筑大学 | Stress self-sensing cement-based material tension sensitivity performance testing method |
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