CN106542787A - Possess the modified cement-based material of graphene nanometer sheet and preparation method of piezoresistive effect - Google Patents
Possess the modified cement-based material of graphene nanometer sheet and preparation method of piezoresistive effect Download PDFInfo
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- CN106542787A CN106542787A CN201610899711.6A CN201610899711A CN106542787A CN 106542787 A CN106542787 A CN 106542787A CN 201610899711 A CN201610899711 A CN 201610899711A CN 106542787 A CN106542787 A CN 106542787A
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- nanometer sheet
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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
- 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
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Carbon And Carbon Compounds (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a kind of modified cement-based material of the graphene nanometer sheet for possessing piezoresistive effect.The material is prepared from by following weight portion by dispensing：0.1～0.24 weight portion of polyacrylate；0.02～0.3 part of weight of graphene nanometer sheet；0.12～0.6 weight portion of polycarboxylate water-reducer；0.3～2 weight portion of economization agent；0.18～2 weight portion of defoamer；12～20 weight portion of water；40～60 weight portion of cement；20～50 weight portion of flyash.The invention also discloses the preparation method of the material.Preparation method of the present invention is simple to operate, cost, with low cost, the modified cement-based material of the graphene nanometer sheet for possessing piezoresistive effect for obtaining and existing preferable piezoresistive effect, has preferable mechanical property again, makes economy and practicality obtain preferable unification.
Description
Technical field
The present invention relates to cement-based material preparation field, more particularly to a kind of graphene nanometer sheet for possessing piezoresistive effect changes
Property cement-based material and preparation method.
Background technology
Nowadays a large amount of infrastructure constructions are still persistently carrying out, therefore, the demand of cement-based material will be further
Increase.With pass through Yangtze River Tunnel or across the Yangtze Bridge high-speed railway and track traffic etc. it is large quantities of built up, just emerging
Build or the later stage by persistently build be related to the great civil engineering of national economy as a example by, these super infrastructural projects are all main
Using the cement-based material of the big scale of construction, its harsh use environment proposes higher performance requirement to concrete.Due to not
During the Load-unload of disconnected circulation, xoncrete structure is susceptible to sudden destruction, causes great property loss and personnel's wound
Die, therefore, take into account improve cement-based material traditional performance while, the safety of cement concrete constructions is carried out in real time,
It is convenient and effectively monitoring be one of most important challenge for facing in current and future cement-based material process of sustainable development.
In early days, being typically employed in pre-buried sensor in concrete (such as optical fiber, piezoelectric ceramics etc.) is carried out to xoncrete structure
Monitoring.However, easily causing stress concentration in material internal pre-buried sensor and reducing the mechanical property of material, this does not obviously meet
The modified original intention of high performance cement-based material.Therefore, the agility cement concrete material itself with piezoresistive characteristic is developed, is made
Xoncrete structure need not can realize intelligent Application by additional sensor device, become the development side of xoncrete structure monitoring
To.In recent years, the development of the cross discipline such as Materials Physics and Chemistry is greatly promoted the research of agility cement based machine material
Process.The functional requirement that development and cement concrete especially with nano material increasingly increases, such as carbon nano-fiber, carbon
The advanced nano material such as nanotube and graphene oxide be used in cement matrix with prepare with self diagnosis, self-regulation, from
The intelligent cement based composites of the function such as adaptation or selfreparing, and achieve more rich achievement in research.But research shows, receives
It is formed on many factors such as combination problem of the above-mentioned material in electric conductivity, physical and mechanical property or and between cement matrix, current water
Cement-based material improves the aspect such as its pressure-sensitive character and mechanical property and engineering intelligent application at the same time and also has a distinct increment sky
Between.
Additionally, at present using nano-material modified cement-based material make it possess exist in the application of piezoresistive effect it is as follows
Problem：First, nano material can not form uniform dispersion；Second, addition is needed in order to obtain good piezoresistive effect
Compared with the nano material of large dosage, this other combination property and economy to cement-based material is very unfavorable, but when reduction
Preferable piezoresistive effect effect can not be obtained again after nano material volume；3rd, although part nano modified material can improve water
The piezoresistive effect of cement-based material, but the performances such as its mechanical strength are adversely affected.
The content of the invention
For the problems referred to above, it is an object of the present invention to provide a kind of graphene nanometer sheet for possessing piezoresistive effect changes
Property cement-based material, the cement-based material not only possesses good piezoresistive effect, also with higher mechanical strength.
Further object is that providing the preparation method of above-mentioned modified cement-based material, the method operating process
Simply, it is reliable.
In order to realize above-mentioned first purpose, the present invention adopts following technical scheme：
A kind of modified cement-based material of the graphene nanometer sheet for possessing piezoresistive effect, which is polyacrylic hydrosol, stone
Black alkene nanometer sheet, polycarboxylate water-reducer, economization agent, defoamer, water, cement and flyash are prepared from by following weight portion：It is poly-
Acrylate is 0.1～0.24 weight portion；Graphene nanometer sheet is 0.02～0.3 weight portion；Polycarboxylate water-reducer be 0.12～
0.6 weight portion；Economization agent is 0.3～2 weight portion；Defoamer is 0.18～2 weight portion；Water is 12～22 weight portions；Cement is
40～60 weight portions；Flyash is 20～45 weight portions, and each dispensing sum is 100 weight portions.
Preferably, the concentration of the polyacrylic hydrosol is 40～50%.
Preferably, the surface area of the graphene nanometer sheet is 320～360m2The graphene nanometer sheet of/g, size are 20
～200nm.When its size is more than 100nm, graphene nanometer sheet should not be referred to as on stricti jurise again, and graphite should be referred to as
Alkene time micron film, for convenience, here, is referred to as graphene nanometer sheet.
Preferably, the cement is Portland cement, and flyash is second class powered coal ash.
In order to realize above-mentioned second purpose, the present invention adopts following technical scheme：
A kind of preparation method of the modified cement-based material of the graphene nanometer sheet for possessing piezoresistive effect, comprises the steps：
1) polyacrylic hydrosol, graphene nanometer sheet are weighed, polycarboxylate water-reducer, economization agent, is disappeared by proportion scale
Infusion, water, cement and flyash, it is standby；
2) polyacrylic hydrosol and graphene nanometer sheet are added to the water, mixture is placed in ice water bath environment simultaneously
Be uniformly dispersed using 2～6h of ultrasonic Treatment, stable graphene nanometer sheet suspension；
3) cement and flyash are stirred using blender, successively graphene nanometer sheet suspension, polycarboxylic acids is subtracted
Water preparation, economization agent, defoamer are added into agitator, by " 20～40s of stirring at low speed, then 2～5min of high-speed stirred, low speed are stirred
Mix 20～40s " scheme stirring obtain uniform cement slurry, then possess pressure drag effect through what maintenance was obtained the present invention
The modified cement-based material of graphene nanometer sheet answered.
Preferably, the step 2) in ultrasonic treatment time be 3～5h.
Graphene nanometer sheet known in those skilled in the art has superpower electric conductivity and a mechanical property, but while, graphite
Alkene nanometer sheet has and has the characteristics of easily reuniting.The present inventor is had found through long-term research, using polyacrylate
Aqueous solution is aided with ultrasonic Treatment means as dispersant, can obtain uniform, stable graphene nanometer sheet suspension；And
And, the graphene nanometer sheet solution can make graphene nanometer sheet continue to keep homodisperse shape when cement-based material is prepared
State, and make the cement-based material for preparing possess good piezoresistive effect, while also having good mechanical property.On the one hand
Solve to improve piezoresistive effect and need to add the heavy dose of material modified and dispersing uniformity that causes and less economical
Problem；On the other hand reached while improving the target of cement-based material piezoresistive effect and reinforced effects.
Description of the drawings
Fig. 1 is embodiment of the present invention A1～5The modified cement-based material of graphene nanometer sheet of preparation and reference examples A0Prepare
The intensity test results contrast figure of cement-based material.
Fig. 2 is embodiment of the present invention A1～5The modified cement-based material of graphene nanometer sheet of preparation and reference examples A0Prepare
The rupture strength test result comparison diagram of cement-based material.
Fig. 3 is embodiment of the present invention A1～5The modified cement-based materials Example of graphene nanometer sheet of preparation and reference examples A0
Resistance test results contrast figure of the cement-based material of preparation under different stress levels.
Fig. 4 is embodiment of the present invention A6State diagram of the graphene nanometer sheet suspension of preparation after 6h is stood.
Fig. 5 is embodiment of the present invention A6State diagram of the graphene nanometer sheet suspension of preparation after 24h is stood.
Specific embodiment
In order to preferably illustrate the present invention, present disclosure, but this are further discussed below with reference to embodiment and accompanying drawing
Invention is not limited only to the following examples.
Reference examples A0：
Polycarboxylate water-reducer：Economization agent：Defoamer：Water：Portland cement：Second class powered coal ash=0.12 part：0.38
Part：0.2 part：16.3 parts：45 parts：38 parts.
First, polycarboxylate water-reducer, economization agent, defoamer, water, Portland cement and two grades are weighed by proportion scale
Flyash, it is standby.Then, cement and flyash are stirred using blender, successively by polycarboxylate water-reducer, economization agent,
Defoamer and water are added into agitator, are obtained by the scheme stirring of " stirring at low speed 30s, high-speed stirred 3min, stirring at low speed 30s "
Uniform cement slurry is obtained, and conserves molding.
Embodiment A1：
Polyacrylic hydrosol：Graphene nanometer sheet, polycarboxylate water-reducer, economization agent, defoamer, water, cement：Fine coal
Ash=0.1 part：0.025 part：0.12 part：0.38 part：0.2 part：16.175 parts：45 parts：38 parts.
Embodiment A2：
Polyacrylic hydrosol, graphene nanometer sheet, polycarboxylate water-reducer, economization agent, defoamer, water, cement：Fine coal
Ash=0.12 part：0.03 part：0.2 part：0.8 part：0.5 part：16.35 parts：40 parts：42 parts.
Embodiment A3：
Polyacrylic hydrosol, graphene nanometer sheet, polycarboxylate water-reducer, economization agent, defoamer, water, cement：Fine coal
Ash=0.15 part：0.055 part：0.2 part：0.8 part：0.5 part：18.295 parts：50 parts：30 parts.
Embodiment A4：
Polyacrylic hydrosol, graphene nanometer sheet, polycarboxylate water-reducer, economization agent, defoamer, water, cement：Fine coal
Ash=0.2 part：0.085 part：0.3 part：1.2 part：0.8 part：17.415 parts：55 parts：25 parts.
Embodiment A5：
Polyacrylic hydrosol, graphene nanometer sheet, polycarboxylate water-reducer, economization agent, defoamer, water, cement：Fine coal
Ash=0.22 part：0.3 part：0.45 part：1.5 part：1.2 part：21.33 parts：55 parts：20 parts.
Embodiment A1～5The modified cement-based material preparation method of the graphene nanometer sheet for possessing piezoresistive effect in, first, press
Proportion scale weighs polyacrylic hydrosol, graphene nanometer sheet, polycarboxylate water-reducer, economization agent, defoamer, water, cement
And flyash, it is standby.
Wherein：
The concentration of the polyacrylic hydrosol is 45%.
The technical specification of the graphene nanometer sheet is：Surface area is 350m2/ g, size are 20～200nm.
The cement is Portland cement, and flyash is second class powered coal ash.
Then, polyacrylic hydrosol and graphene nanometer sheet are added to the water, mixture is placed in into ice water bath environment
In and be uniformly dispersed using ultrasonic Treatment 5h, stable graphene nanometer sheet suspension；Using blender by cement and
Flyash stirs, and graphene nanometer sheet suspension, polycarboxylate water-reducer, economization agent, defoamer is added to stirring successively
In device, uniform cement slurry is obtained by the scheme stirring of " stirring at low speed 30s, high-speed stirred 3min, stirring at low speed 30s ", so
Can obtain possessing the modified cement-based material of the graphene nanometer sheet of piezoresistive effect and reinforced effects through maintenance afterwards.
Embodiment A1～5And reference examples A0In polycarboxylate water-reducer, economization agent, defoamer be buy on market common
Product, its particular type do not affect the enforcement of the present invention.
Embodiment A6：
Graphene nanometer sheet is added to the water, mixture is placed in ice water bath environment and is obtained using ultrasonic Treatment 5h
Graphene nanometer sheet suspension.Wherein graphene nanometer sheet concentration is 1mg/mL.Stand 6h and observe its stable case, see Fig. 4 a.
Stand 24h and observe its stable case, see Fig. 5 a.
Polyacrylic hydrosol and graphene nanometer sheet are added to the water, mixture is placed in ice water bath environment and is adopted
Graphene nanometer sheet suspension is obtained with ultrasonic Treatment 5h.Wherein graphene nanometer sheet concentration be 1mg/mL, polyacrylate
Concentration be followed successively by 4mg/mL, 8mg/mL, 12mg/mL and 16mg/mL.Stand 6h observe its stable case, see respectively Fig. 4 b,
4c、4d、4e.Stand 24h and observe its stable case, see Fig. 5 b, 5c, 5d, 5e respectively.
Test the comprcssive strength of embodiment of the present invention test specimen and reference examples test specimen respectively according to ASTM C109 and ASTM C78
And rupture strength, as a result as depicted in figs. 1 and 2.Tried using circuit tester test invention embodiment test specimen and reference examples
Part under the conditions of differently stressed (0.1～0.5MPa) resistance value, as a result as shown in Figure 3.
According to Fig. 1 and Fig. 2 results, the comprcssive strength and rupture strength phase of the modified cement-based material of graphene nanometer sheet
Than having different degrees of raising in the cement-based material for not adding graphene nanometer sheet modified；According to Fig. 3 results, Graphene
The modified cement-based material of nanometer sheet has significant piezoresistive effect.
According to Fig. 4,5, the sonicated and scattered graphene nanometer sheet suspension of polyacrylic hydrosol without
By the standing through 6h or 24 hour, its steady statue hardly changes, and remains uniform, stable dispersity.
The inventor most long Continuous Observation 60d times, it is also found that the sonicated and scattered Graphene of polyacrylic hydrosol
Nanometer sheet suspension or uniform, stable dispersity.But the graphene nanometer sheet of non-addition polymerization acrylate aqueous dispersion
Through the standing of 6h, that is, there is most of generation sedimentation, then settle down completely through the standings of 24 hours.Inventor also sends out simultaneously
Existing, even if adding polyacrylic hydrosol, if without supersound process, only mechanical agitation is uniform, to graphene nanometer sheet
Dispersion effect it is also poor, after the standing of 24 hours, graphene nanometer sheet is also almost settled down completely.
Claims (6)
1. the modified cement-based material of a kind of graphene nanometer sheet for possessing piezoresistive effect, it is characterised in that：The material is pressed by dispensing
Following weight portion is prepared from：0.1～0.24 weight portion of polyacrylate；0.02～0.3 weight portion of graphene nanometer sheet；Poly- carboxylic
0.12～0.6 weight portion of sour water reducer；0.3～2 weight portion of economization agent；0.18～2 weight portion of defoamer；12～22 weight of water
Part；40～60 weight portion of cement；20～45 weight portion of flyash, and each dispensing sum is 100 weight portions.
2. the modified cement-based material of the graphene nanometer sheet for possessing piezoresistive effect according to claim 1, it is characterised in that：
The concentration of the polyacrylic hydrosol is 40～50%.
3. the modified cement-based material of the graphene nanometer sheet for possessing piezoresistive effect according to claim 1 and 2, its feature exist
In：The surface area of the graphene nanometer sheet is 320～360m2The graphene nanometer sheet of/g, size are 20～200nm.
4. the modified cement-based material of the graphene nanometer sheet for possessing piezoresistive effect according to claim 1 and 2, its feature exist
In：The cement is Portland cement, and flyash is second class powered coal ash.
5. the preparation of the modified cement-based material of the graphene nanometer sheet for possessing piezoresistive effect described in any one of Claims 1-4
Method, it is characterised in that：The method comprises the steps：
1) weigh polyacrylic hydrosol, graphene nanometer sheet, polycarboxylate water-reducer, economization agent, defoamer, water, cement and
Flyash, it is standby；
2) polyacrylic hydrosol and graphene nanometer sheet are added to the water, mixture is placed in ice water bath environment and is adopted
2～6h of ultrasonic Treatment is uniformly dispersed, stable graphene nanometer sheet suspension；
3) cement and flyash are stirred using blender, successively by graphene nanometer sheet suspension, polycarboxylate water-reducer,
Economization agent, defoamer are added into agitator, by " 20～40s of stirring at low speed, 2～5min of high-speed stirred, stirring at low speed 20～
The scheme stirring of 40s " obtains uniform cement slurry, and Jing maintenances obtain final product the modified cement of graphene nanometer sheet for possessing piezoresistive effect
Sill.
6. the preparation method of the modified cement-based material of the graphene nanometer sheet for possessing piezoresistive effect according to claim 5,
It is characterized in that：The step 2) in ultrasonic treatment time be 3～5h.
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| CN111848031A (en) * | 2020-07-13 | 2020-10-30 | 深圳市展旺新材料科技有限公司 | Graphene cement-based conductive composite material and preparation method thereof |
| CN112010601A (en) * | 2020-08-17 | 2020-12-01 | 盐城工学院 | High-sensitivity pressure-resistance effect concrete and preparation method thereof |
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