CN106116366B - A kind of nano-titanium dioxide reinforced reactive-powder-concrete and preparation method thereof - Google Patents
A kind of nano-titanium dioxide reinforced reactive-powder-concrete and preparation method thereof Download PDFInfo
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- CN106116366B CN106116366B CN201610505154.5A CN201610505154A CN106116366B CN 106116366 B CN106116366 B CN 106116366B CN 201610505154 A CN201610505154 A CN 201610505154A CN 106116366 B CN106116366 B CN 106116366B
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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
Abstract
The invention discloses a kind of nano-titanium dioxide reinforced reactive-powder-concretes and preparation method thereof, which contains cement, nano-titanium dioxide, silicon ash, flyash, sand, water-reducing agent and water.The advantages of both present invention combination nano-titanium dioxide, Reactive Powder Concrete, the promotion humidification for enhancing mechanism using itself of nano-titanium dioxide and Reactive Powder Concrete and mutually cooperateing with, so that fracture resistance, compressive property and the endurance quality of the Reactive Powder Concrete prepared are all significantly improved compared with the cement-base composite material that blank Reactive Powder Concrete and nano-titanium dioxide enhance, and Reactive Powder Concrete electrology characteristic can be assigned.It is demonstrated experimentally that material mixture ratio using the present invention and preparation method, can be made high intensity, high tenacity, and have both the nano-titanium dioxide reinforced reactive-powder-concrete of electrology characteristic under conditions of conventional method conserves.
Description
Technical field
The present invention relates to building material technical field, more particularly to a kind of nano-titanium dioxide reinforced reactive-powder-concrete
And preparation method thereof.
Background technology
Cement concrete is as one of maximum construction material of current dosage, so far from invention in 1824, be the mankind into
Step and expanding economy are made that tremendous contribution.Since reform and opening-up, the rapid growth of cement output effectively supports China
Economic fast development, still, resources of production consumption present in cement industry production is big, and energy consumption is big and environmental pollution is tight
The problems such as weight, becomes the unfavorable factor for restricting the development of China's cement industry, how more to save clinker, reduces environment
Pollution more makes manufactured concrete play high performance advantage, makes people that focus more be turned to development high-performance
Concrete.Reactive Powder Concrete is a kind of New Building Materials, it have high intensity, bearing capacity under the same conditions, can
To reduce the dosage of cement, and then the resources of production consumption during cement generates, energy consumption and environmental pollution are reduced, existed in recent years
Extensive attention has been obtained in engineering.
But in actual application, some factors can restrict the popularization of Reactive Powder Concrete.On the one hand due to activity powder
Last concrete is usually required using hot water maintenance or steam press maintenance so that is needed to use special maintenance of equipment in construction, be increased
Engineering cost is added, on the other hand, Reactive Powder Concrete is usually used in conjunction with steel fibre, although and steel fibre can enhance
The mechanical property of Reactive Powder Concrete, but it is easy to corrode under rugged environment, also affects work to a certain extent
The durability of property powder concrete.
Invention content
According to technical problem set forth above, and provide a kind of nano-titanium dioxide reinforced reactive-powder-concrete and its system
Preparation Method.
The technological means that the present invention uses is as follows：
A kind of nano-titanium dioxide reinforced reactive-powder-concrete, containing cement, nano-titanium dioxide, silicon ash, flyash,
Sand, water-reducing agent and water.
Substance containing following parts by weight：
1 part of cement,
0.002-0.1 parts of nano-titanium dioxide,
0.2-0.4 parts of silicon ash,
0.1-0.2 parts of flyash,
1-2 parts of sand,
0.003-0.01 parts of water-reducing agent,
0.3-0.38 parts of water.
The crystal form of the nano-titanium dioxide is rutile-type, anatase titanium dioxide or rutile-type and anatase titanium dioxide mixed crystal type, golden red
The particle size range of the nano-titanium dioxide of stone-type be 10-1500nm, anatase titanium dioxide the nano-titanium dioxide grain size model
It is 10-500nm to enclose for the particle size range of the nano-titanium dioxide of 10-500nm, rutile-type and anatase titanium dioxide mixed crystal type.
The content of titanium dioxide is more than 99% in the nano-titanium dioxide.
The grain size of the silicon ash is 100-200nm.
The grain size of the flyash is 0.12-0.83mm.
The sand includes quartz sand I, quartz sand II and quartz sand III, and the particle size range of the quartz sand I is 0.125-
0.18mm, the quartz sand II particle size range be 0.18-0.425mm, the particle size range of the quartz sand III is 0.425-
0.85mm, the mass ratio between the quartz sand I, the quartz sand II and the quartz sand III are 1:1:1.
The water-reducing agent is polycarboxylate water-reducer.
The cement is preferably Portland cement.
The invention also discloses a kind of method preparing a kind of nano-titanium dioxide reinforced reactive-powder-concrete,
With following steps：
Water, water-reducing agent, nano-titanium dioxide are poured into agitated kettle by S1, the substance for weighing the parts by weight, and speed of agitator is set
For 140 ± 5r/min, 20s being stirred, then pours into silicon ash in agitated kettle, speed of agitator is set as 140 ± 5r/min, stirs 60s,
Cement and flyash are added sequentially in agitated kettle again later, speed of agitator is set as 140 ± 5r/min, after stirring 2min, then
Speed of agitator is changed to 285 ± 10r/min, 2min is stirred, finally pours into sand in agitated kettle, speed of agitator is set as 140 ± 5r/
Speed of agitator after stirring 1min, then is changed to 285 ± 10r/min, stirs 4min by min；
S2, the mixture obtained in step S1 is poured into mold, then mold is placed on shake table, be vibrated to surface
There is bubble to emerge；
S3, mold is put into curing box, is 20 ± 1 DEG C in temperature, humidity conserves 24 hours under conditions of being more than 95%
Form removal afterwards obtains the nano-titanium dioxide reinforced reactive-powder-concrete test specimen.
In order to detect a kind of performance of nano-titanium dioxide reinforced reactive-powder-concrete, can step S3 it
Before, according to the size of mixture in mold, be inserted into two electrodes for connecting external circuit, vibrate again, it is ensured that electrode and
Mixture contact is good.The electrode is the mesh electrode piece of conduction, and material is preferably stainless steel.
The advantages of both present invention combination nano-titanium dioxide and Reactive Powder Concrete, utilizes nano-titanium dioxide and work
Property powder concrete itself enhancing mechanism and the promotion humidification that mutually cooperates with, be finally prepared for using conventional maintenance side
Method, high intensity, high tenacity, high-durability, and have both the nano-titanium dioxide reinforced reactive-powder-concrete of electrology characteristic.
1, nano-titanium dioxide has high specific surface area and reactivity, can be imitated by filing effect and nucleus
It should wait to promote hydration reaction, increase hydrated product, reduce calcium hydroxide crystals size and change calcium hydroxide crystals
Orientation (compares known to Fig. 1, Fig. 2 and Fig. 3), keeps Reactive Powder Concrete matrix more closely knit, mixed to improve reactive powder
The intensity of solidifying soil matrix body.
2, nano-titanium dioxide can significantly improve the flexural strength and compression strength of Reactive Powder Concrete, in rutile
In type, anatase titanium dioxide, rutile-type and anatase titanium dioxide mixed crystal type nanometer titanium dioxide, rutile type nano titanic oxide is to reactive powder
The enhancing effect of concrete is best, in early stage flexural strength, later stage flexural strength, early anti pressured intension, later stage compression strength side
Face improvement effect is all very significantly.Nanometer anatase titania is to Reactive Powder Concrete early stage flexural strength and later stage pressure resistance
Degree raising is larger, and wherein early stage flexural strength increase rate can reach 65.29%, and later stage compression strength increase rate can reach
24.91%.Mixed crystal type nanometer titanium dioxide is larger to Reactive Powder Concrete early stage flexural strength and compression strength raising, wherein
Early stage flexural strength increase rate can reach 58.54%, and early anti pressured intension increase rate can reach 18.53%.
3, nano-titanium dioxide sheet has certain electric conductivity as semiconductor, since it has small-size effect, energy simultaneously
It is enough that conductive network is formed inside Reactive Powder Concrete, electric conductivity is improved, to make Reactive Powder Concrete resistivity reduce,
Assign its electrology characteristic.
4, Reactive Powder Concrete internal structure is fine and close, defect is few, light-weight, and nano material is not only made preferably to play effect
Fruit makes conductive network more completely stablize, and can reduce the dead weight of structure, meets the developing direction of structural material from now on.
5, nano-titanium dioxide reinforced reactive-powder-concrete resistivity of the present invention can first be reduced with the increase of volume
After increase, but resistivity is consistently less than the resistivity of blank Reactive Powder Concrete.
The present invention can be widely popularized in building material technical field based on the above reasons.
Description of the drawings
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is the microcosmic stereoscan photograph of calcium hydroxide in test specimen 1；
Fig. 2 is the microcosmic stereoscan photograph of calcium hydroxide in test specimen 2；
Fig. 3 is the microcosmic stereoscan photograph of calcium hydroxide in test specimen 4；
Fig. 4 is sample dimensions and electrode arrangement schematic diagram；
The curve that Fig. 5 is 3 days, 28 day age test specimen flexural strength changes with nano-titanium dioxide volume；
Fig. 6 is the curve that 3 days, 28 days and 60 day age test specimen compression strength changes with nano-titanium dioxide volume；
Fig. 7 is the song that nano-titanium dioxide reinforced reactive-powder-concrete resistivity changes with nano-titanium dioxide volume
Line.
Specific implementation mode
A kind of nano-titanium dioxide reinforced reactive-powder-concrete, containing cement, nano-titanium dioxide, silicon ash, flyash,
Sand, water-reducing agent and water.
Substance containing following parts by weight：
1 part of cement,
0.002-0.1 parts of nano-titanium dioxide,
0.2-0.4 parts of silicon ash,
0.1-0.2 parts of flyash,
1-2 parts of sand,
0.003-0.01 parts of water-reducing agent,
0.3-0.38 parts of water.
The crystal form of the nano-titanium dioxide is rutile-type, anatase titanium dioxide or rutile-type and anatase titanium dioxide mixed crystal type, golden red
The particle size range of the nano-titanium dioxide of stone-type be 10-1500nm, anatase titanium dioxide the nano-titanium dioxide grain size model
It is 10-500nm to enclose for the particle size range of the nano-titanium dioxide of 10-500nm, rutile-type and anatase titanium dioxide mixed crystal type.
The content of titanium dioxide is more than 99% in the nano-titanium dioxide.
The grain size of the silicon ash is 100-200nm.
The grain size of the flyash is 0.12-0.83mm.
The sand includes quartz sand I, quartz sand II and quartz sand III, and the particle size range of the quartz sand I is 0.125-
0.18mm, the quartz sand II particle size range be 0.18-0.425mm, the particle size range of the quartz sand III is 0.425-
0.85mm, the mass ratio between the quartz sand I, the quartz sand II and the quartz sand III are 1:1:1.
The water-reducing agent is polycarboxylate water-reducer.
A method of a kind of nano-titanium dioxide reinforced reactive-powder-concrete is prepared, there are following steps：
Water, water-reducing agent, nano-titanium dioxide are poured into agitated kettle by S1, the substance for weighing the parts by weight, and speed of agitator is set
For 140 ± 5r/min, 20s being stirred, then pours into silicon ash in agitated kettle, speed of agitator is set as 140 ± 5r/min, stirs 60s,
Cement and flyash are added sequentially in agitated kettle again later, speed of agitator is set as 140 ± 5r/min, after stirring 2min, then
Speed of agitator is changed to 285 ± 10r/min, 2min is stirred, finally pours into sand in agitated kettle, speed of agitator is set as 140 ± 5r/
Speed of agitator after stirring 1min, then is changed to 285 ± 10r/min, stirs 4min by min；
S2, the mixture obtained in step S1 is poured into mold, then mold is placed on shake table, be vibrated to surface
There is bubble to emerge；
S3, mold is put into curing box, is 20 ± 1 DEG C in temperature, humidity conserves 24 hours under conditions of being more than 95%
Form removal afterwards obtains the nano-titanium dioxide reinforced reactive-powder-concrete test specimen.
Embodiment
A kind of nano-titanium dioxide reinforced reactive-powder-concrete
1 raw-material weight of table is than proportioning
Note：Nano-titanium dioxide volume, which calculates, uses inner blending method.
S1, substance described in table 1 is weighed, water, water-reducing agent, nano-titanium dioxide (test specimen 1 is not added with) is poured into agitated kettle, stirred
Rotating speed is set as 140 ± 5r/min, stirs 20s, then pours into silicon ash in agitated kettle, speed of agitator is set as 140 ± 5r/min, stirs
60s is mixed, cement and flyash are added sequentially in agitated kettle again later, speed of agitator is set as 140 ± 5r/min, stirs 2min
Afterwards, then by speed of agitator it is changed to 285 ± 10r/min, stirs 2min, finally pours into sand in agitated kettle, speed of agitator is set as 140
Speed of agitator after stirring 1min, then is changed to 285 ± 10r/min, stirs 4min by ± 5r/min；
S2, the mixture obtained in step S1 is poured into mold 1 (40mm × 40mm × 160mm), then mold 1 is set
There is bubble to emerge on shake table, being vibrated to surface；
S3, according to the size of mixture in mold 1, be inserted into two electrodes 2 for connecting external circuit, vibrate again,
Ensure that electrode 2 and mixture contact are good.Later, mold 1 is put into curing box, is 20 ± 1 DEG C in temperature, humidity is big
Form removal after being conserved 24 hours under conditions of 95%, obtains test specimen 1,2,3,4.
The electrode 2 is the mesh electrode piece of conduction, and material is preferably stainless steel.Described two electrodes 2 and 1 end of mold
Portion is arranged in parallel, respectively apart from 1 end 10mm of mold, as described in Figure 4.
It is conserved after form removal：Test specimen is immediately placed in 20 ± 1 DEG C of water after form removal and is conserved to required different larval instar,
The test specimen of wherein 60 day age is conserved in standard curing room to 28 days, then, quiet be put into 60 days is taken out from water and is tested.
Flexural strength：Flexural strength test is carried out with the anti-folding instrument of glue sand.
Compression strength：The compression strength of test specimen is measured with universal testing machine, displacement-control mode, loading speed is
1.2mm/min。
Resistance：It is tested with multimeter, test method is to exchange, two electrodes.
Resistivity is calculated by formula ρ=RS/l.
By Fig. 5, Fig. 6 it is found that mixing 1% nano-titanium dioxide reinforced reactive-powder-concrete than nano-titanium dioxide cement base
29.51% and 44.95% is respectively increased in composite material 3 days and 28 days flexural strengths.Mix 3% nano-titanium dioxide enhancing activity powder
48.05% He is respectively increased than nano-titanium dioxide cement-base composite material 3 days and 28 days flexural strengths in last concrete
49.05%.Mix 5% nano-titanium dioxide reinforced reactive-powder-concrete than nano-titanium dioxide cement-base composite material 3 days and
72.68% and 85.38% is respectively increased in flexural strength within 28 days.In terms of compression strength, 28 day age mixed 1%, 3% and 5%
Nano-titanium dioxide reinforced reactive-powder-concrete is respectively than the nano-titanium dioxide cement-base composite material resistance to compression of identical age
Intensity improves 56.04%, 63.76% and 80.47%.In addition, mixing 1% nano-titanium dioxide reinforced reactive-powder-concrete than empty
3 days of white Reactive Powder Concrete and 28 days flexural strengths are respectively increased 14.45% and 40.05%, and 3 days, 28 days and 60 days
Compression strength is respectively increased 10.91%, 9.3% and 25.56%.Mix 3% nano-titanium dioxide reinforced reactive-powder-concrete ratio
Blank Reactive Powder Concrete 3 days and 28 days flexural strengths have been respectively increased 42.21% and 53.71%, and 3 days, 28 days and 60
Its compression strength has been respectively increased 6.36%, 9.59% and 30.79%.Mix 5% nano-titanium dioxide enhancing reactive powder coagulation
29.27% and 53.52% has been respectively increased than blank Reactive Powder Concrete 3 days and 28 days flexural strengths in soil, and 3 days, 28 days
It is respectively increased 6.64%, 8.77% and 27.82% with 60 days compression strength.From the above experimental data it is found that nanometer titanium dioxide
Titanium can significantly improve the flexural strength and compression strength of Reactive Powder Concrete, and wherein flexural strength increase rate is up to
53.71%, compression strength increase rate is up to 30.79%.In addition, Reactive Powder Concrete internal structure is fine and close, defect is few, it can
So that nano material preferably plays effect.Compared with nano-titanium dioxide cement-base composite material, flexural strength increase rate
Up to 85.38%, compression strength increase rate is up to 80.47%.
As shown in Figure 7, the admixture of nano-titanium dioxide can improve the electric conductivity of Reactive Powder Concrete.Wherein add
1% nano-titanium dioxide can make 28 days resistivity of Reactive Powder Concrete reduce by 37.25%.Add 3% nanometer two
Titanium oxide can make 28 days resistivity of Reactive Powder Concrete reduce by 27.46%.Adding 5% nano-titanium dioxide can make
28 days resistivity of Reactive Powder Concrete reduce by 22.29%.This illustrates that nano-titanium dioxide can assign reactive powder coagulation
Native electrology characteristic.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (8)
1. a kind of nano-titanium dioxide reinforced reactive-powder-concrete,
Substance containing following parts by weight：
1 part of cement,
0.002-0.1 parts of nano-titanium dioxide,
0.2-0.4 parts of silicon ash,
0.1-0.2 parts of flyash,
1-2 parts of sand,
0.003-0.01 parts of water-reducing agent,
0.3-0.38 parts of water.
2. a kind of nano-titanium dioxide reinforced reactive-powder-concrete according to claim 1, which is characterized in that described to receive
The crystal form of rice titanium dioxide is rutile-type, anatase titanium dioxide or rutile-type and anatase titanium dioxide mixed crystal type, the nanometer of rutile-type
The particle size range of titanium dioxide is 10-1500nm, the particle size range of the nano-titanium dioxide of anatase titanium dioxide is 10-500nm, gold
The particle size range of the nano-titanium dioxide of red stone-type and anatase titanium dioxide mixed crystal type is 10-500nm.
3. a kind of nano-titanium dioxide reinforced reactive-powder-concrete according to claim 1, which is characterized in that described to receive
The content of titanium dioxide is more than 99% in rice titanium dioxide.
4. a kind of nano-titanium dioxide reinforced reactive-powder-concrete according to claim 1, which is characterized in that the silicon
The grain size of ash is 100-200nm.
5. a kind of nano-titanium dioxide reinforced reactive-powder-concrete according to claim 1, which is characterized in that the powder
The grain size of coal ash is 0.12-0.83mm.
6. a kind of nano-titanium dioxide reinforced reactive-powder-concrete according to claim 1, which is characterized in that the sand
Including quartz sand I, quartz sand II and quartz sand III, the particle size range of the quartz sand I is 0.125-0.18mm, the quartz sand
II particle size range is 0.18-0.425mm, the particle size range of the quartz sand III is 0.425-0.85mm, the quartz sand I,
Mass ratio between the quartz sand II and the quartz sand III is 1:1:1.
7. nano-titanium dioxide reinforced reactive-powder-concrete according to claim 1, which is characterized in that the water-reducing agent
For polycarboxylate water-reducer.
8. a kind of method preparing a kind of nano-titanium dioxide reinforced reactive-powder-concrete described in claim 1, feature
It is with following steps：
Water, water-reducing agent, nano-titanium dioxide are poured into agitated kettle by S1, the substance for weighing the parts by weight, and speed of agitator is set as
140 ± 5r/min stirs 20s, then pours into silicon ash in agitated kettle, and speed of agitator is set as 140 ± 5r/min, stirs 60s, it
Cement and flyash are added sequentially in agitated kettle again afterwards, speed of agitator is set as 140 ± 5r/min, after stirring 2min, then will
Speed of agitator is changed to 285 ± 10r/min, stirs 2min, finally pours into sand in agitated kettle, speed of agitator is set as 140 ± 5r/
Speed of agitator after stirring 1min, then is changed to 285 ± 10r/min, stirs 4min by min；
S2, the mixture obtained in step S1 is poured into mold, then mold is placed on shake table, being vibrated to surface has gas
Bubble is emerged；
S3, mold is put into curing box, is 20 ± 1 DEG C in temperature, humidity is torn open after being conserved 24 hours under conditions of being more than 95%
Mould obtains the nano-titanium dioxide reinforced reactive-powder-concrete test specimen.
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| CN103979886A (en) * | 2014-04-30 | 2014-08-13 | 河海大学 | High early-strength high-performance concrete mixed with nano silicon dioxide powder and preparation method thereof |
| CN104030634A (en) * | 2014-06-12 | 2014-09-10 | 杭州固华复合材料科技有限公司 | High-strength and high-toughness reactive powder concrete of carbon doped nano-tube and preparation method of high-strength and high-toughness reactive powder concrete |
| CN104909657A (en) * | 2015-05-29 | 2015-09-16 | 合肥瑞鹤装饰工程有限公司 | Thermal insulation energy-saving environmentally friendly plant fiber cement composite plate and producing method thereof |
| CN105198304A (en) * | 2015-08-12 | 2015-12-30 | 大连理工大学 | Compound mortar with compound addition of carbon fibers and nano-silica and preparation technology and application thereof |
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