CN103102092A - Concrete modifier and concrete - Google Patents
Concrete modifier and concrete Download PDFInfo
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- CN103102092A CN103102092A CN2013100603593A CN201310060359A CN103102092A CN 103102092 A CN103102092 A CN 103102092A CN 2013100603593 A CN2013100603593 A CN 2013100603593A CN 201310060359 A CN201310060359 A CN 201310060359A CN 103102092 A CN103102092 A CN 103102092A
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Abstract
The invention provides a concrete modifier, comprising 10-80 weight parts of carbon nanotubes, 2-7 weight parts of cement and / or a cement raw material and 5-10 weight parts of an acrylic emulsion. Compared with graphite powder modifier and steel fiber modifier in the prior art, the invention has the following advantages: first, the invention uses the carbon nanotubes as the main electrical property modifier, which can realize good electrical performance improvement with small addition amount, and has little impact on mechanical properties and impulse current withstand performance of the concrete; second, after the reaction, the acrylic emulsion can gradually produce acrylic resin to fill gaps within the concrete, improve impermeability of the concrete, and high tenacity of the acrylic resin endows the conductive concrete with strong mechanical properties; and third, addition of the cement and / or the cement main material into the modifier can improve dispersion of the carbon nanotubes and compatibility of the carbon nanotubes with the main material of the concrete.
Description
Technical field
The invention belongs to building material technical field, relate in particular to a kind of concrete modifying agent and concrete.
Background technology
Existing more than 100 year of concrete developing history, it has become the material of construction that in world wide, field of civil engineering is most widely used, consumption is maximum.Generally the resistivity of normal concrete is high, belongs to the poor conductor of electricity.Add the conductive component material of certain content during conducting concrete in normal concrete, by components such as gelling material, electro-conductive material, dielectric aggregate and water, according to the novel concrete based composites that certain proportioning condensation by mixing forms, have the electrical property of regulation and the new concrete of certain mechanical property.The characteristics of conducting concrete existing structure material, have again electroconductibility and alert and resourceful characteristic, make concrete not only use as a kind of structured material, and have vital role at aspects such as electrician, industrial electrostatic prevention, building and heating, electric heater, power equipment earth work and great Civil Infrastructure Systems.
The conductive component material mixes in concrete, makes in whole concrete matrix the conductive particle subchain that is connected to occur, makes electrolytical short circuit in concrete, makes it conduction by the motion of electronics.MSun etc. are by thinking to the conductive component experimental study, and have three kinds of electrically conducting manners in conducting concrete: (1) ionic conduction is present in Ca in hole solution
2+, Na, K, OH
-And SO
4 2-The plasma motion forms; (2) electronic conduction is by the migration formation of unbound electron; (3) hole conduction is by the migration formation in hole.The common concrete electroconductibility of function influence of crossing of these three aspects.Obtaining stable electroconductibility mainly is to make the electronics can be by means of the motion of electronics in the motion of ionogen intermediate ion or metal and semi-conductor and flow.
At present, in conducting concrete, conductive component commonly used mainly is divided three classes: polymer class, carbon class and metal species.Wherein, the conducting medium for the preparation conducting concrete generally has following a few class: graphite, slag, steel fiber, carbonaceous aggregate and carbon black etc.But for a long time, the acquisition of the conductivity of conducting concrete is usually to sacrifice its intensity as cost.
Graphite has good electroconductibility, and (carbon content is greater than 80%, its resistivity is not more than 0.5 Ω cm usually), compare with metal-powders such as copper powder, iron powder, aluminium powders, have the advantages such as stable chemical nature, acid and alkali-resistance, good in oxidation resistance, but powdered graphite needs the higher volume of admixture could form the conductive network that is interconnected in concrete substrate, and the water requirement of powdered graphite is very large, need to increase considerably the water consumption of concrete mix, and then cause concrete intensity along with the volume of powdered graphite increases and fast-descending.
Steel fiber has advantages of the mechanical properties such as the concrete tension of raising, bending resistance, shearing resistance, simultaneously also can bring into play its conducting function as metal, yet, prolongation along with the time, Steel Fiber Reinforced Concrete is due to its high alkalinity environment, metal easily produces passive film, causes concrete resistivity obviously to increase.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is to provide a kind of concrete modifying agent and concrete, and this properties-correcting agent can improve concrete conductivity and mechanical property simultaneously.
The invention provides a kind of concrete modifying agent, comprising:
Carbon nanotube 10 ~ 80 weight parts;
Major ingredient 2 ~ 7 weight parts of cement and/or cement;
ACRYLIC EMULSION 5 ~ 10 weight parts.
Preferably, also comprise: carbon black 1 ~ 15 weight part.
Preferably, described carbon black is the micron order carbon black.
Preferably, the diameter of described carbon nanotube is 50 ~ 80nm.
Preferably, the length of described carbon nanotube is 3 ~ 6mm.
Preferably, the major ingredient of described cement is one or more in silicate, Wingdale, flyash and bauxitic clay.
Preferably, described carbon nanotube is 15 ~ 75 weight parts.
Preferably, the major ingredient of described cement and/or cement is 2 ~ 6 weight parts.
The present invention also provides a kind of concrete, comprises the described concrete modifying agent of claim 1 ~ 8 any one.
Preferably, the quality of described concrete modifying agent is 5 ~ 10wt% of concrete quality.
The invention provides a kind of concrete modifying agent, comprise the carbon nanotube of 10 ~ 80 weight parts, the cement of 2 ~ 7 weight parts and/or the major ingredient of cement, 5 ~ 10 parts by weight of acrylic acid emulsions.Compare with Graphite Powder 99 of the prior art and steel fiber properties-correcting agent, at first, the present invention is take carbon nanotube as main electrical property properties-correcting agent, adds to obtain on a small quantity preferably that electrical property improves effect, and less for impacts such as concrete mechanical property, rush current tolerance performances; Secondly, ACRYLIC EMULSION can generate acrylic resin gradually after reaction, but its impermeability is improved in the gap of fill concrete inside, and the high tenacity that possesses of acrylic resin itself gives conducting concrete stronger anti-mechanical force performance simultaneously; Again, the major ingredient that adds cement and/or cement in properties-correcting agent can improve the dispersed of carbon nanotube and with the consistency of concrete major ingredient.
Experimental result shows, under the dry condition of concrete of the present invention, resistivity can be less than 1.64 Ω m, and folding strength can reach 8.9MPa, and ultimate compression strength can reach 44.1MPa.
Embodiment
The invention provides a kind of concrete modifying agent, comprising:
Carbon nanotube 10 ~ 80 weight parts;
Major ingredient 2 ~ 7 weight parts of cement and/or cement;
ACRYLIC EMULSION 5 ~ 10 weight parts.
Wherein, described carbon nanotube is preferably 15 ~ 75 weight parts, more preferably 30 ~ 75 weight parts.Described carbon nanotube is that carbon nanotube well known to those skilled in the art gets final product, and there is no special restriction.Carbon nanotube described in the present invention is preferably one or both in Single Walled Carbon Nanotube and multi-walled carbon nano-tubes.The diameter of described carbon nanotube is preferably 50 ~ 80nm, more preferably 60 ~ 70nm.The length of described carbon nanotube is preferably 3 ~ 6mm, more preferably 4 ~ 6mm.
As the main electrical property properties-correcting agent of concrete, its conductivity is better with carbon nanotube, add to obtain on a small quantity preferably that conductivity improves effect, and less for the impact of concrete mechanical property, rush current tolerance performance.
The major ingredient of described cement and/or cement is preferably 2 ~ 6 weight parts, more preferably 4 ~ 6 weight parts.Described cement is that cement well known to those skilled in the art gets final product, and there is no special restriction.The major ingredient of described cement is that the major ingredient of composition cement well known to those skilled in the art gets final product, there is no special restriction, the major ingredient of cement described in the present invention is preferably one or more in silicate, Wingdale, flyash and bauxitic clay, more preferably silicate, Wingdale, flyash or bauxitic clay.
In the present invention, a kind of in cement composition fully mixed with carbon nanotube in advance, a kind of as in properties-correcting agent can improve the dispersing property of carbon nanotube, and with the consistency of concrete major ingredient.
Described ACRYLIC EMULSION is preferably 6 ~ 10 weight parts.Described ACRYLIC EMULSION is that ACRYLIC EMULSION well known to those skilled in the art gets final product, and there is no special restriction.For reducing costs, be preferably commercially pure ACRYLIC EMULSION in the present invention.
ACRYLIC EMULSION can generate acrylic resin gradually after reaction, but its impermeability is improved in the gap of fill concrete inside, and simultaneously, the high tenacity that acrylic resin itself possesses gives conducting concrete stronger anti-mechanical force performance.
According to the present invention, described concrete modifying agent preferably also comprises the carbon black of 1 ~ 15 weight part, 2 ~ 13 weight parts more preferably, then be preferably 5 ~ 13 weight parts.
Described carbon black is that carbon black well known to those skilled in the art gets final product, and there is no special restriction.Carbon black described in the present invention is preferably the micron order carbon black, more preferably the high-purity carbon black of micron order.
The conductivity of carbon nanotube is relevant with its nano-dispersed state, and carbon blacksurface contains a lot of micropores, adsorbable a large amount of carbon nanotube, the mode that the employing carbon black combines with carbon nanotube is as properties-correcting agent, can improve the dispersing property of carbon nanotube in concrete, increase the loading level of carbon nanotube, also can improve concrete physical strength simultaneously, therefore can make concrete keep mobility and plasticity-preferably when initial set.
The preparation of concrete modifying agent of the present invention is prepared according to method well known to those skilled in the art and gets final product, and there is no special restriction.The present invention preferably is prepared in accordance with the following methods: with the carbon nanotube of 10 ~ 80 weight parts, the cement of 2 ~ 7 weight parts and/or the major ingredient of cement and 5 ~ 10 parts by weight of acrylic acid emulsion mix and blends carry out drying after mixing, pulverize, and obtain concrete modifying agent.Described drying is preferably vacuum-drying, and the temperature of described drying is preferably 100 ℃ ~ 140 ℃, and the time of described drying is preferably 40 ~ 60h.Preferably also add the carbon black of 1 ~ 15 weight part in the present invention.
The major ingredient of described carbon nanotube, cement and/or cement, ACRYLIC EMULSION and carbon black are all same as above, do not repeat them here.
The present invention also provides a kind of concrete, comprises above-mentioned concrete modifying agent, and the quality that more preferably comprises concrete modifying agent is 5 ~ 10% of concrete quality.Described concrete other moietys are that the concrete composition of preparation well known to those skilled in the art gets final product, and there is no special restriction.Concrete described in the present invention preferably includes cement, river sand, stone, concrete additives and concrete modifying agent of the present invention, and described concrete additives is that concrete additives well known to those skilled in the art gets final product, and there is no special restriction.
Described concrete preparation method is that method well known to those skilled in the art gets final product, and there is no special restriction.
Experimental result shows, under the dry condition of concrete of the present invention, resistivity can be less than 1.64 Ω m, and folding strength can reach 8.9MPa, and ultimate compression strength can reach 44.1MPa.
In order to further illustrate the present invention, below in conjunction with embodiment, a kind of concrete modifying agent provided by the invention and concrete are described in detail.
In following examples, reagent used is commercially available.
Embodiment 1
The carbon nanotube of 75 weight parts, the carbon black of 10 weight parts, the silicate of 5 weight parts are mixed with the ACRYLIC EMULSION of 10 weight parts, add in homogenizer and fully stir, put into vacuum drying oven after mixing, 120 ℃ of dry 48h, pulverize, obtain concrete modifying agent.
Embodiment 2
The water-proof emulsion of 20 weight parts is soluble in water, add the concrete modifying agent that obtains in the embodiment 1 of cement 60 weight parts and 7 weight parts, rotating speed with 300r/min stirs 10min, then the river sand that adds 50 weight parts, continuation is stirred 10min with the rotating speed of 300r/min, casting film, maintenance obtained concrete in 30 days under the normal curing condition.
Utilize the concrete resistivity determinator that the concrete that obtains in embodiment 2 is tested, obtain that under its dampness, resistivity is 0.52 Ω m, under drying regime, resistivity is 1.64 Ω m.
According to GB/T19856.1, the concrete that obtains in embodiment 2 is tested, obtained its rush current tolerance Δ R%=2.7%.
Carry out power current tolerance test to obtaining concrete in embodiment 3, obtain its power current tolerance Δ R%=11.1%.
Utilize TYE-20 agent on crack resistance of concrete folding compression testing machine that the concrete that obtains in embodiment 2 is tested, obtaining its folding strength is 8.4MPa, and ultimate compression strength is 43.5MPa.
Embodiment 3
The water-proof emulsion of 10 weight parts is soluble in water, add the concrete modifying agent that obtains in the embodiment 1 of cement 70 weight parts and 7.5 weight parts, rotating speed with 300r/min stirs 10min, then the river sand that adds 60 weight parts, continuation is stirred 10min with the rotating speed of 300r/min, casting film, maintenance obtained concrete in 30 days under the normal curing condition.
Utilize the concrete resistivity determinator that the concrete that obtains in embodiment 3 is tested, obtain that under its dampness, resistivity is 0.58 Ω m, under drying regime, resistivity is 1.74 Ω m.
According to GB/T19856.1, the concrete that obtains in embodiment 3 is tested, obtained its rush current tolerance Δ R%=2.7%.
Carry out power current tolerance test to obtaining concrete in embodiment 3, obtain its power current tolerance Δ R%=1.6%.
Utilize TYE-20 agent on crack resistance of concrete folding compression testing machine that the concrete that obtains in embodiment 3 is tested, obtaining its folding strength is 8.9MPa, and ultimate compression strength is 44.1MPa.
The above is only the preferred embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a concrete modifying agent, is characterized in that, comprising:
Carbon nanotube 10 ~ 80 weight parts;
Major ingredient 2 ~ 7 weight parts of cement and/or cement;
ACRYLIC EMULSION 5 ~ 10 weight parts.
2. concrete modifying agent according to claim 1, is characterized in that, also comprises: carbon black 1 ~ 15 weight part.
3. concrete modifying agent according to claim 2, is characterized in that, described carbon black is the micron order carbon black.
4. concrete modifying agent according to claim 1, is characterized in that, the diameter of described carbon nanotube is 50 ~ 80nm.
5. concrete modifying agent according to claim 1, is characterized in that, the length of described carbon nanotube is 3 ~ 6mm.
6. concrete modifying agent according to claim 1, is characterized in that, the major ingredient of described cement is one or more in silicate, Wingdale, flyash and bauxitic clay.
7. concrete modifying agent according to claim 1, is characterized in that, described carbon nanotube is 15 ~ 75 weight parts.
8. concrete modifying agent according to claim 1, is characterized in that, the major ingredient of described cement and/or cement is 2 ~ 6 weight parts.
9. a concrete, is characterized in that, comprises the described concrete modifying agent of claim 1 ~ 8 any one.
10. concrete according to claim 9, is characterized in that, the quality of described concrete modifying agent is 5 ~ 10wt% of concrete quality.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310060359.3A CN103102092B (en) | 2013-02-26 | 2013-02-26 | Concrete modifier and concrete |
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| CN201310060359.3A CN103102092B (en) | 2013-02-26 | 2013-02-26 | Concrete modifier and concrete |
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| CN103102092A true CN103102092A (en) | 2013-05-15 |
| CN103102092B CN103102092B (en) | 2014-12-10 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103641362A (en) * | 2013-11-29 | 2014-03-19 | 江苏百瑞吉新材料有限公司 | Concrete modifying agent |
| CN105110684A (en) * | 2015-08-31 | 2015-12-02 | 广西路佳道桥勘察设计有限公司 | Concrete and modifier thereof |
| CN105601174A (en) * | 2015-10-13 | 2016-05-25 | 国家电网公司 | Preparation method of carbon nanotube modified grounding module |
| CN106892632A (en) * | 2017-02-27 | 2017-06-27 | 苏州科斯曼照明工程有限公司 | A kind of concrete for brick wall door opening displacement |
| CN107129181A (en) * | 2016-02-26 | 2017-09-05 | 上海绿源生态混凝土有限公司 | The pervious concrete specialist additive purified water |
| CN108298931A (en) * | 2017-11-23 | 2018-07-20 | 柳州市柳晶科技股份有限公司 | A kind of cement brick prepared using Industrial Solid Waste |
| CN108424068A (en) * | 2018-03-21 | 2018-08-21 | 大连理工大学 | A kind of conducting concrete material and preparation method thereof |
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| CN101274831A (en) * | 2008-05-16 | 2008-10-01 | 哈尔滨工业大学 | Carbon nano-tube fiber cement-based material and preparation thereof |
| WO2012084404A1 (en) * | 2010-12-20 | 2012-06-28 | Evonik Degussa Gmbh | Composition having improved weathering stability of the colour of building materials and process for the production thereof |
| CN102674881A (en) * | 2012-05-18 | 2012-09-19 | 大连理工大学 | Wave-absorbing foam concrete and preparation method for |
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| CN101274831A (en) * | 2008-05-16 | 2008-10-01 | 哈尔滨工业大学 | Carbon nano-tube fiber cement-based material and preparation thereof |
| WO2012084404A1 (en) * | 2010-12-20 | 2012-06-28 | Evonik Degussa Gmbh | Composition having improved weathering stability of the colour of building materials and process for the production thereof |
| CN102674881A (en) * | 2012-05-18 | 2012-09-19 | 大连理工大学 | Wave-absorbing foam concrete and preparation method for |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103641362A (en) * | 2013-11-29 | 2014-03-19 | 江苏百瑞吉新材料有限公司 | Concrete modifying agent |
| CN103641362B (en) * | 2013-11-29 | 2015-07-01 | 江苏百瑞吉新材料有限公司 | Concrete modifying agent |
| CN105110684A (en) * | 2015-08-31 | 2015-12-02 | 广西路佳道桥勘察设计有限公司 | Concrete and modifier thereof |
| CN105601174A (en) * | 2015-10-13 | 2016-05-25 | 国家电网公司 | Preparation method of carbon nanotube modified grounding module |
| CN105601174B (en) * | 2015-10-13 | 2017-11-21 | 国家电网公司 | The preparation method of carbon nano-tube modification earthing module |
| CN107129181A (en) * | 2016-02-26 | 2017-09-05 | 上海绿源生态混凝土有限公司 | The pervious concrete specialist additive purified water |
| CN106892632A (en) * | 2017-02-27 | 2017-06-27 | 苏州科斯曼照明工程有限公司 | A kind of concrete for brick wall door opening displacement |
| CN106892632B (en) * | 2017-02-27 | 2019-02-12 | 重庆驰旭混凝土有限公司 | A kind of concrete for the displacement of brick wall door opening |
| CN108298931A (en) * | 2017-11-23 | 2018-07-20 | 柳州市柳晶科技股份有限公司 | A kind of cement brick prepared using Industrial Solid Waste |
| CN108424068A (en) * | 2018-03-21 | 2018-08-21 | 大连理工大学 | A kind of conducting concrete material and preparation method thereof |
| CN108424068B (en) * | 2018-03-21 | 2019-09-27 | 大连理工大学 | A kind of conducting concrete material and preparation method thereof |
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|---|---|
| CN103102092B (en) | 2014-12-10 |
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