CN105906259A - Co-doped scale graphite engineering cement-based composite conductive material and preparation method thereof - Google Patents
Co-doped scale graphite engineering cement-based composite conductive material and preparation method thereof Download PDFInfo
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- CN105906259A CN105906259A CN201610228299.5A CN201610228299A CN105906259A CN 105906259 A CN105906259 A CN 105906259A CN 201610228299 A CN201610228299 A CN 201610228299A CN 105906259 A CN105906259 A CN 105906259A
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- Prior art keywords
- cement
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- graphite powder
- graphite
- crystalline flake
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Classifications
-
- 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
- C04B28/02—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 containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/90—Electrical properties
- C04B2111/94—Electrically conducting materials
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a co-doped scale graphite engineering cement-based composite conductive material and a preparation method thereof. Raw materials of the composite conductive material comprise, by weight, 50-100 parts of cement, 60-120 parts of fly ash, 40-80 parts of fine sands, 20-40 parts of graphite powder, 1-7 parts of polyethelene alcohol fibers, 30-70 parts of water and 0.5-2 parts of a water reducer. The preparation method comprises the following steps: weighing the raw materials according to above weight proportions; adding cement, fly ash, water and the water reducer to a cement mortar stirrer to prepare a neat cement paste; sequentially adding fine sands and the graphite powder to the neat cement paste, and continuously stirring to obtain a graphite-cement matrix; adding the polyethelene alcohol fibers to the graphite powder-cement matrix, and rapidly stirring to obtain a cement-based composite conductive material mixture; and pouring the mixture to a die, curing, and demolding to obtain a co-doped scale graphite engineering cement-based composite conductive material test piece. The material has the advantages of good tensile strength, high toughness, dense cracks, good conductive performance and substantial self-induction characteristic.
Description
Technical field
The present invention relates to explore ground building field, be specifically related to one mix again crystalline flake graphite engineered cementitious base composite conducting material and
Its preparation method, material belongs to a kind of novel answering and mixes crystalline flake graphite and PVA fibre modification cement based composite conducting material.
Background technology
At present, improvement cement material performance so that it is the functional requirement meeting modern building fabric is sending out of civil engineering material research
Exhibition direction.Recent study persons utilize the filler that the electrical conductivity such as carbon-based material, metal material and slag are higher, to cement based
The electric conductivity of material improves, and obtains resistivity relatively low, and durability is preferable, even show good pressure-sensitive from perception water
Cement-based composite material, makes conventional cement material tend to intellectuality.
Carbon-based material, as CNT, nano carbon black, Graphene and native graphite etc. are respectively provided with higher specific surface area, good
Electric conductivity, be more preferably the selecting of conducting medium in cement-base composite material, existing research application (1, Liu Tao. mix thin again
The pressure-sensitive research [D] of the cement-base composite material of steel fibre and graphite. Wuhan University of Technology, 2013. Guo Li duckweeds, Ding Cong, Yang Bo,
Deng；2, steel fiber reinforced concrete analyzes [J] with armored concrete resistivity. Hebei University of Technology's journal, and 2014 (6): 26-29.) show
Its to the improvement degree of electric conductivity also superior to the metallic fiber being separately filled, powder or slag.But, divided by carbon molecule space
Minor structure and the impact of bigger intermolecular force, this material is strong as conducting medium water absorption, easy conglomeration.Yang Yuanxia, hair
Rise, the research of the Dispersion of Fiber in Carbon Fiber Cement Composites of the proposition such as Shen great Rong (Journal of Building Materials, 2001,
4 (1): 84-88.) find that the most on the one hand mix carbon series conductive in ordinary cement sill can reduce the mobility of material mixture, increases
Big water-cement ratio；On the other hand can affect the carrying out of hydration reaction, significantly weaken the mechanical property of this material.
PVA chopped strand to the enhancing of cement matrix, toughening effect highly significant, U.S. Victor Li and Leung (Wang S,
Wu C,Li V C.Tensile strain-hardening behavior or polyvinyl alcohol engineered cementitious
Composite (PVA-ECC) [J] .ACI Materials Journal, 2001,98 (6): 483-492.) this PVA-ECC material proposed
Material has been successfully applied in Practical Project.This material shows strain hardening and the spy of fine and closely woven fracture propagation in tensile test
Property, change the conventional cement material phenomenon at limit stress brittle break simultaneously.In actual applications, prepared by this material
Technique is loaded down with trivial details, relatively costly, hinders it and extensively uses, and meanwhile, PVA-ECC material does not has self-sensing properties.
Summary of the invention
The technical problem to be solved in the present invention is, for deficiencies of the prior art, it is provided that one mixes crystalline flake graphite work again
Journey cement based composite conducting material and preparation method thereof, both can realize cement-based material and have sensing function, also had concurrently good simultaneously
Good service behaviour and mechanical property, suitable extensively application.
The present invention solves that above-mentioned technical problem be the technical scheme is that
One mixes crystalline flake graphite engineered cementitious base composite conducting material again, and raw material includes graphite powder (crystalline flake graphite), polyethylene
Alcohol fiber (PVA), cement, flyash, fine sand, water, polycarboxylate water-reducer are mixed in constant weight ratio, wherein
Cement 50～100 parts, flyash 60～120 parts, fine sand 40～80 parts, graphite powder 20～40 parts, vinal 1～7 parts,
Water 30～70 parts, water reducer 0.5～2 parts.
By such scheme, by volume from the point of view of mark, graphite powder accounts for the 5%～15% of raw material cumulative volume, and vinal accounts for former
All materials long-pending 1%～2%.
By such scheme, described cement is Portland cement, and flyash is one-level or second class powered coal ash.
By such scheme, described fine sand is normal sands (natural sand, artificial sand, quartz sand) grain after standard screen sieves
Footpath is less than 0.63mm, and modulus of fineness is 2.2～1.6, and mean diameter is 0.35～0.25mm.
By such scheme, described graphite powder is natural minerals processing or manually prepares, and graphite powder is mainly composed of fixed carbon,
Graphite powder existence form is crystalline flake graphite.
Present invention also offers a kind of above-mentioned preparation method mixing crystalline flake graphite engineered cementitious base composite conducting material again, including as follows
Step:
1) raw material of described weight ratio ratio is measured；
2) in cement plaster blender, addition cement, flyash, water, water reducer prepare cement paste；
3) toward being sequentially added into fine sand in cement paste, graphite powder continues mix, until graphite powder is dispersed, obtain graphite powder-
Cement matrix；
4) in graphite powder-cement matrix, add vinal and quickly stir formation material slurry, until vinal
It is uniformly dispersed, without clustering phenomena, regulates and controls duration of mixing, reach more than 180mm to this material slurry jumping table fluidity, obtain water
Mud base composite conducting material mixture；
5) step 4) in the mixture that obtains be poured in mould, tamp (without vibrating, also can vibrate a little) floating；
6) mould is placed in temperature be 20 DEG C, relative humidity be 95% curing box in maintenance 24～the demoulding after 48 hours, obtain
Mix crystalline flake graphite engineered cementitious base composite conducting material test specimen again.
Beneficial effects of the present invention:
1, relatively traditional cement mortar material and ordinary cement sill, the present invention adds PVA chopped strand, flyash activity is mixed
The engineered cementitious based composites of the compositions such as material, meets the design of material theory of mesomechanics and fracture mechanics, has higher anti-
The advantages such as tensile strength, high tenacity (fine and closely woven characteristic of crack), strain hardening, it is adaptable to the injury repairing of structure advancing side is reinforced,
And ductility requires higher works pave-load layer；
2, more common ECC material, the present invention adds graphite powder, has good electric conductivity and significant self induction feature,
The stress state of structure can be deduced out from conductivity variations, can as structure-function integration materials application in structural thermal insulation,
The fields such as the monitoring of deicing or snow melting, road Traffic Volume and monitoring structural health conditions；
3, the present invention also provides for conducting electricity from the application in detection technique of the perception cement based sensing material, more traditional monitor and detection skill
Art, mixing crystalline flake graphite engineered cementitious base composite conducting material again is structural material, self is exactly sensor simultaneously, and it prepares work
Skill is simple, self-compacting type concrete and good with xoncrete structure binding ability, and this material static resistivity is little simultaneously, draws quick/pressure-sensitive steady
Fixed, highly sensitive.
Accompanying drawing explanation
Fig. 1 is the stereoscan photograph figure that the present invention mixes crystalline flake graphite engineered cementitious base composite conducting material again；
Fig. 2 is the stereoscan photograph figure of ordinary skill cement-base composite material；
Fig. 3 is the resistivity graph of a relation with graphite powder volume of conductive material of the present invention；
Fig. 4 be under setting ratio of the present invention cement based composite conducting material during compression damage change in resistance rate and pressure with
The variation relation figure of time；
Fig. 5 be under setting ratio of the present invention cement based composite conducting material during tensile failure change in resistance rate and pulling force with
The variation relation figure of time；
Fig. 6 is the correlogram of resistivity of material amplitude of variation of the present invention and compressive stress state；
Fig. 7 is the correlogram of resistivity of material amplitude of variation of the present invention and tensile stress state.
Detailed description of the invention
Technical solution of the present invention is described in detail by below in conjunction with the accompanying drawings with one preferred embodiment.
The weight ratio preferably mixing crystalline flake graphite engineered cementitious base composite conducting material again consists of: cement 50 parts, flyash 61
Part, fine sand 46 parts, graphite powder 21 parts, vinal 3 parts, 33 parts of water, water reducer 2 parts.
Answering after the demoulding is mixed crystalline flake graphite engineered cementitious base composite conducting material test specimen and is carried out maintenance in normal-temperature water in standard curing room
To 7 days.
Test specimen impedance uses the test of constant-current source four electrode method, is then scaled resistivity of material by Ohm's law.
Alert and resourceful characteristic (pressure-sensitive/draw quick property) testing procedure is as follows:
1, electrode is laid in surface of test piece according to constant-current source four electrode impedance method of testing；
2, test specimen is placed in universal testing machine loading area, the position that test specimen contacts with fixture/pressure head is carried out insulation processing
(being wound around parcel electric insulation glue or pad with insulation spacer), and adjust test specimen position；
3, universal testing machine is with Bit andits control loading velocity, is set as 0.1mm/min, is loaded onto test specimen and reaches capacity tension/pressurized
State is destroyed；
4, while test specimen load test, the resistance value of constant-current source four electrode impedance test system this material test specimen of real-time translocation is used,
Digital multi-channel data acquisition unit frequency acquisition is set as 1 time/s；
5, in data acquisition, the load-displacement data of test specimen under universal testing machine synchronous recording, the corresponding moment will be recorded
Resistance value carry out conversion and obtain resistivity of material；
6, computer sensitivity sensitivity, definition sensitivity is that the absolute value of change in resistance rate is divided by stress.
The comparative example of the present invention is blank group (common ECC material), low graphite powder volume contrast groups and high graphite powder volume
Contrast groups, ibid, but in different group material, carbon dust volume volume is different for preparation and maintenance process.
Embodiment and comparative example blank group electron microscopic observation image are as shown in Fig. 1～Fig. 2.
Embodiment and comparative example respectively organize the relation of the resistivity (impedance modulus) of material and graphite powder volume as shown in Figure 3.
The mechanical performance index that embodiment respectively organizes material with comparative example is as shown in table 1.
Table 1
Embodiment invention resistivity of material rate of change and payload values relation over time are as shown in Fig. 4～Fig. 5, wherein:
Fig. 4 is cement based composite conducting material change in resistance rate during stress destruction (pressurized) under embodiment setting ratio
With pressure graph of a relation over time, from curve it can be seen that material test specimen elastic deformation stage, test specimen resistance value is stable
Mild decline；After entering the elastic-plastic deformation stage, resistivity fall is slightly aggravated；Rank are destroyed when test specimen is in plastic deformation
Duan Shi, its impedance then moment all fluctuation, be reflected in curve the jump being change in resistance；
Fig. 5 is cement based composite conducting material change in resistance rate during stress destruction (tension) under embodiment setting ratio
With pulling force graph of a relation over time, from curve it can be seen that material test specimen is before the tensile strength that reaches capacity, electric conductivity
Performance is stable, and resistivity is only going up by a small margin；After the tensile strength that reaches capacity, major fracture extends, and it is a plurality of to pull out other
Microcrack so that resistance value ascensional range is aggravated, and change in resistance speed (showing as slope of a curve) is increasing.
The test data of Fig. 4, Fig. 5 is analyzed, obtains embodiment invention resistivity of material amplitude of variation and stress state
Correlation curve is as shown in Fig. 6～Fig. 7, wherein:
Fig. 6 is the embodiment material correlogram in pressurized elastic-plastic deformation stage change in resistance amplitude Yu compressive stress state,
It is σ=(-0.1 η that matching obtains change in resistance amplitude η with value of compressive stress σ dependent equation3-0.6·η2-1.2·η)·fc, f in formulacFor
Material comprcssive strength, its coefficient of determination R2=0.998, it was demonstrated that this embodiment invention material has significant pressure-sensitive character；
Fig. 7 is the embodiment material correlogram in tension elastic-plastic deformation stage change in resistance amplitude Yu tensile stress state,
It is σ=(0.0022 η that matching obtains η Yu σ dependent equation3-0.04·η2+0.33·η)·ftk, f in formulatkFor material cracks stress,
Its coefficient of determination R2=0.972, it was demonstrated that this embodiment invention material has and significantly draws quick characteristic.
Obviously, above-described embodiment only clearly demonstrates example of the present invention, and not to embodiments of the present invention
Limit.For those of ordinary skill in the field, what spirit under this invention was extended out obviously changes or becomes
Move among still in protection scope of the present invention.
Claims (6)
1. mix crystalline flake graphite engineered cementitious base composite conducting material again for one kind, it is characterized in that, raw material includes that graphite powder, vinal, cement, flyash, fine sand, water, polycarboxylate water-reducer are mixed in constant weight ratio, wherein cement 50 ~ 100 parts, 60 ~ 120 parts of flyash, fine sand 40 ~ 80 parts, graphite powder 20 ~ 40 parts, vinal 1 ~ 7 part, 30 ~ 70 parts of water, water reducer 0.5 ~ 2 part.
The most according to claim 1 mix crystalline flake graphite engineered cementitious base composite conducting material again, it is characterised in that by volume from the point of view of mark, graphite powder accounts for the 5% ~ 15% of raw material cumulative volume, and vinal accounts for the 1% ~ 2% of raw material cumulative volume.
The most according to claim 1 mix crystalline flake graphite engineered cementitious base composite conducting material again, it is characterised in that described cement is Portland cement, and flyash is one-level or second class powered coal ash.
The most according to claim 1 mix crystalline flake graphite engineered cementitious base composite conducting material again, it is characterised in that described fine sand be normal sands after standard screen sieves particle diameter less than 0.63mm, modulus of fineness is 2.2 ~ 1.6, and mean diameter is 0.35 ~ 0.25mm。
The most according to claim 1 mix crystalline flake graphite engineered cementitious base composite conducting material again, it is characterised in that described graphite powder is natural minerals processing or manually prepares, and graphite powder is mainly composed of fixed carbon, and graphite powder existence form is crystalline flake graphite.
6. the preparation method mixing crystalline flake graphite engineered cementitious base composite conducting material according to answering described in any one of claim 1 ~ 5, it is characterised in that comprise the steps:
1) raw material of described weight ratio ratio is measured；
2) in cement plaster blender, addition cement, flyash, water, water reducer prepare cement paste；
3) in cement paste, it is sequentially added into fine sand, graphite powder continuation mix, until graphite powder is dispersed, obtains graphite powder-cement matrix；
4) in graphite powder-cement matrix, add vinal and quickly stir formation material slurry, until vinal is uniformly dispersed, without clustering phenomena, regulate and control duration of mixing, reach more than 180mm to this material slurry jumping table fluidity, obtain cement based composite conducting material mixture；
5) mixture obtained in step 4) is poured in mould, tamps and floating；
6) mould is placed in temperature be 20 DEG C, relative humidity be 95% curing box in the demoulding after maintenance 24 ~ 48 hours, mixed crystalline flake graphite engineered cementitious base composite conducting material test specimen again.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610228299.5A CN105906259A (en) | 2016-04-13 | 2016-04-13 | Co-doped scale graphite engineering cement-based composite conductive material and preparation method thereof |
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| CN201610228299.5A CN105906259A (en) | 2016-04-13 | 2016-04-13 | Co-doped scale graphite engineering cement-based composite conductive material and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107382161A (en) * | 2017-07-25 | 2017-11-24 | 合肥达户电线电缆科技有限公司 | A kind of ink powder cement-base composite material and preparation method thereof |
| CN111423163A (en) * | 2020-03-30 | 2020-07-17 | 广东邦普循环科技有限公司 | Regenerated graphite-cement mortar composite material and preparation method thereof |
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| JPH06235639A (en) * | 1993-02-08 | 1994-08-23 | Mitsui Mining Co Ltd | Light concrete pile |
| CN1673167A (en) * | 2005-04-18 | 2005-09-28 | 蔡庆宗 | Pren process of graphite-mixing conductive concrete |
| CN101602590A (en) * | 2009-06-30 | 2009-12-16 | 武汉理工大学 | In mix CCCW carbon fiber and graphite sensitive concrete and application thereof |
| CN101602591A (en) * | 2009-06-30 | 2009-12-16 | 武汉理工大学 | In mix CCCW graphite sensitive concrete and application thereof |
| CN105371744A (en) * | 2015-11-02 | 2016-03-02 | 武汉理工大学 | High ductility cement base strain transducer |
-
2016
- 2016-04-13 CN CN201610228299.5A patent/CN105906259A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06235639A (en) * | 1993-02-08 | 1994-08-23 | Mitsui Mining Co Ltd | Light concrete pile |
| CN1673167A (en) * | 2005-04-18 | 2005-09-28 | 蔡庆宗 | Pren process of graphite-mixing conductive concrete |
| CN101602590A (en) * | 2009-06-30 | 2009-12-16 | 武汉理工大学 | In mix CCCW carbon fiber and graphite sensitive concrete and application thereof |
| CN101602591A (en) * | 2009-06-30 | 2009-12-16 | 武汉理工大学 | In mix CCCW graphite sensitive concrete and application thereof |
| CN105371744A (en) * | 2015-11-02 | 2016-03-02 | 武汉理工大学 | High ductility cement base strain transducer |
Non-Patent Citations (1)
| Title |
|---|
| 李继业等: "《特殊材料新型混凝土技术》", 31 August 2007 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107382161A (en) * | 2017-07-25 | 2017-11-24 | 合肥达户电线电缆科技有限公司 | A kind of ink powder cement-base composite material and preparation method thereof |
| CN111423163A (en) * | 2020-03-30 | 2020-07-17 | 广东邦普循环科技有限公司 | Regenerated graphite-cement mortar composite material and preparation method thereof |
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Application publication date: 20160831 |