CN103664026A - Concrete-used modifier of metakaolin base slurry state and preparation method thereof - Google Patents
Concrete-used modifier of metakaolin base slurry state and preparation method thereof Download PDFInfo
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- CN103664026A CN103664026A CN201310603742.9A CN201310603742A CN103664026A CN 103664026 A CN103664026 A CN 103664026A CN 201310603742 A CN201310603742 A CN 201310603742A CN 103664026 A CN103664026 A CN 103664026A
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- metakaolin
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- 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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Abstract
The invention discloses a concrete-used modifier of metakaolin base slurry state and a preparation method thereof. The concrete-used modifier is prepared through the steps of adding water into a dry base made of metakaolin and fly ash, and mixing; the dry base comprises 20%-80% of metakaolin in weight, and 20%-80% of fly ash in weight; the weight of water is 50%-200% of the weight of the dry base; the metakaolin is prepared by the following steps: incinerating kaolin powder at 600-850 DEG C for 2-4 hours; cooling; breaking apart through a beater, with the average diameter lower than 8 micrometer; the fly ash is ball-shaped with the diameter smaller than 10 micrometers. According to the invention, the problem that the fluidity of mortar and concrete is influenced while the metakaolin is in use is solved, the strength of the mortar and the concrete at early stage and later stage is improved while the fluidity is not influenced, and the use cost of the metakaolin in construction materials is reduced.
Description
Technical field
The invention belongs to building material technical field, be specifically related to a kind of for improving metakaolin base pulpous state properties-correcting agent of the performances such as cement concrete strength and preparation method thereof.
Background technology
Along with the input of China's capital construction constantly increases, cement concrete is as main engineering materials, and its range of application also constantly expands, and extends to gradually in harsher environment.Super-high buildings for example, deep layer hypogee, large nuclear power station, building of irrigation works, even bay, ocean engineering construction, this just has higher requirement to the performance of modern concrete, requires concrete to have higher intensity and weather resistance.At present, using the method improve comparatively widely concrete performance is to add high-performance mineral Additive, and traditional mineral admixture is that a kind of in silicon ash, flyash and breeze or two kinds form.The conventional mineral admixture application of this class is comparatively ripe, but also has certain defect, and for example the price of silicon ash is too high, and the local silicon ash quality difference of collecting of difference is larger, transports difficulty, and increases the risk of concrete self-shrinkage and cracking; The early hydration ability of flyash is poor, during single fly ash, early age strength of concrete is had to certain disadvantageous effect; Slag source is more and more nervous, so high-quality breeze is difficult to satisfy the demands.
For a long time, various mineral admixtures all join cement concrete with the form of powdery, often exist and disperse inadequate problem, and the phenomenon of size separation even occurs, particularly the silicon ash of the little light weight of grain.On the other hand, part mineral admixture (as silicon ash, metakaolin) directly adds in concrete with powder form, can cause that fresh concrete mobility reduces, and cohesiveness increases, or the problem that water requirement increases, this will make concrete application performance or range of application be affected.
Metakaolin is a kind of mineral material for the effect of being significantly improved of concrete intensity, volume stability, weather resistance, but while joining concrete with powdery, there will be the problem that above-mentioned water requirement increases or mobility reduces, so, be difficult to widespread use in Practical Project.
Kaolin can be prepared metakaolin by certain thermal regulation calcining, and metakaolin, as a kind of novel active mineral Additive, has carried out long-term research, and has been applied on a small quantity engineering practice in laboratory.In concrete, singly mix metakaolin, can improve to a certain extent concrete early stage and later stage ultimate compression strength, bending strength and tensile splitting strength, the weather resistance such as the chloride-penetration resistance of raising hardened cement paste, inhibition alkali-aggregate reaction, anti-sulphates corrosive and freeze-thaw-circulation.This is due to the active A l in metakaolin
2o
3can react with hydrolysis product of cement, promoted to have the generation of the ettringite of microdilatancy effect, reduce the early stage self-constriction of concrete, metakaolin particle is tiny, particle diameter is conventionally below several microns, space while being incorporated in concrete in energy filling concrete slurry, the degree of compactness of increase slurry, and activeconstituents wherein and Ca (OH)
2reaction generates jel product, plays the concrete pore rate that reduces, the effect in refinement aperture, and this has effectively stoped the diffusion of water molecules and the migration of harmful ion.But study, show, singly mixing powdery metakaolin can produce significant reducing effect to concrete work performance, even affects normal construction, and metakaolin joins in cement concrete and is difficult for disperseing with powder-form.When application metakaolin, with powder-form, joined concrete completely in the past, and before adding, will take measures to prevent and treat metakaolin and make moist.
Goal of the invention
It is a kind of for concrete metakaolin base pulpous state properties-correcting agent and preparation method thereof that the object of the invention is to provide, and improves the dispersion effect of metakaolin in cement concrete, improves concrete flowability, improves its early stage and later strength.
For achieving the above object, adopt technical scheme as follows:
For a concrete metakaolin base pulpous state properties-correcting agent, the butt being comprised of metakaolin and flyash adds water again and mixes.
Press such scheme, in described butt, metakaolin volume is 20%～80wt%, and the volume of flyash is 20%～80wt%, and the volume of water is 50%～200% of butt quality.
Press such scheme, described metakaolin prepares as follows:
Temperature lower calcination 2～4h by kaolin powder at 600 ℃～850 ℃, cooling after, with beater, break up, median size is below 8 μ m; Described kaolin powder Al
2o
3and SiO
2content more than 70wt%.
Press such scheme, described flyash is to receive the thin ash of catching in the flue gas after thermal power plant coal burning, and profile is pearl particle, and median size is below 10 μ m; Described flyash Al
2o
3and SiO
2content more than 50wt%.
A preparation method for concrete metakaolin base pulpous state properties-correcting agent, comprises the following steps:
Respectively by metakaolin, flyash dry for standby; The metakaolin of having dried, flyash are placed in respectively to beater and disperse 10～15min; Mix and blend 3min forms butt, then adds water stirring 10～15min and makes metakaolin base pulpous state properties-correcting agent; In described butt, metakaolin volume is 20%～80wt%, and the volume of flyash is 20%～80wt%, and the volume of water is 50%～200% of butt quality.
Press such scheme, described metakaolin prepares as follows:
Temperature lower calcination 2～4h by kaolin powder at 600 ℃～850 ℃, cooling after, with beater, break up, median size is below 8 μ m; Described kaolin powder Al
2o
3and SiO
2content more than 70wt%.
Press such scheme, described flyash is to receive the thin ash of catching in the flue gas after thermal power plant coal burning, and profile is pearl particle, and median size is below 10 μ m; Described flyash Al
2o
3and SiO
2content more than 50wt%.
The present invention is mixed and made into slurry by metakaolin and water, a part of free water is entered in kaolin structure layer in advance, thereby make it in a kind of moisture state, when metakaolin slip mixes with grout and sandstone material, metakaolin is just no longer fought for moisture with other material, also may be to output moisture in system.In the situation that total water consumption does not increase, pulpous state metakaolin can improve concrete flowability, major cause has been to change the direction of storeroom Water Transport in concrete system adding of pulpous state metakaolin: powdery metakaolin adds fashionable, due to quick water suction, cause its cement granules around to be drawn close to it, thereby formed many " thickness points ", reduced mobility; When pulpous state metakaolin adds fashionablely, due to the outwards water delivery that do not absorb water even, thereby metakaolin particle become " lubricant ", thereby improved mobility.
Metakaolin slip is applied in cement concrete, can improve the dispersion effect of metakaolin in cement concrete, and to a certain degree reduces its impact on mortar and concrete flowability.Further prepare a kind of metakaolin base mineral slurries with flyash is compound, under the prerequisite that does not affect mortar and concrete flowability, improve its early stage and later strength.After metakaolin and flyash are compound, the ball effect that the spherical shapes of flyash is brought into play can increase the dispersion effect of metakaolin in cement concrete on the one hand, and the high pozzolanic activity of metakaolin is better brought into play; Can eliminate on the other hand metakaolin water suction and cause the detrimentally affect to mortar and concrete flowability, and two kinds of Additives compound after grating more reasonable, particle packing is more tight, has reduced to a certain extent the consumption of filling water, is equivalent to reduce part water consumption.After being made into slurry, use, what make that it disperses in cement concrete is more even, and the pozzolanic activity of Additive can better be brought into play.Active A l in metakaolin and flyash
2o
3can react with hydrolysis product of cement, promoted to have the generation of the ettringite of microdilatancy effect, reduce the early stage self-constriction of concrete, metakaolin particle is tiny, particle diameter is conventionally below several microns, and grain composition is reasonable, the space while being incorporated in concrete in energy filling concrete slurry, increase the degree of compactness of slurry, and wherein active components A l
2o
3and SiO
2with Ca (OH)
2reaction generates jel product, plays the concrete pore rate that reduces, and the effect in refinement aperture has improved cement concrete in early days and the intensity in later stage.
The invention has the beneficial effects as follows:
Metakaolin used can be produced with batch production, and with respect to silicon ash, the Additives such as breeze can accomplish that the composition of material is stable, and this has also just guaranteed the stability of made concrete product intensity; Flyash used is trade waste, is conducive to the recycling of trade waste; After being made into metakaolin base mineral slurries, solved the in use impact on mortar and concrete flowability of metakaolin, accomplish to improve mortar and concrete early stage and later strength under the prerequisite that does not affect mobility, and reduced the use cost of metakaolin in material of construction.
Embodiment
In order to understand better the present invention, below in conjunction with example, further illustrate content of the present invention, but the present invention is not only confined to the following examples.
Metakaolin: the temperature lower calcination 2～4h by kaolin powder at 600 ℃～850 ℃, after cooling, be placed on and in beater, break up 10min, with laser particle size analyzer, measure its median size and (take from Tian Honggao ridge, Yunnan mining industry company limited, its SiO below 8 μ m
2and Al
2o
3total content is more than 70wt%).Standby.
Flyash: profile is pearl particle, is placed on after oven dry in beater and breaks up 10min, measures its median size (take from thermal power plant, its SiO with laser particle size analyzer below 10 μ m
2and Al
2o
3total content is more than 50wt%).Standby.
Metakaolin base pulpous state properties-correcting agent: the metakaolin of above-mentioned dry for standby and flyash are placed in respectively to beater and disperse 10～15min; Then mix and blend 3min forms butt, adds water stirring 10～15min and makes metakaolin base pulpous state properties-correcting agent; In butt, metakaolin volume is 20%～80wt%, and the volume of flyash is 20%～80wt%, and the volume of water is 50%～200% of butt quality.
Embodiment 1
The preparation of higher territory slurry: above-mentioned standby metakaolin and water in mass ratio 1:1 mix, is placed in stirrer and stirs 10min and mix, and makes metakaolin slurry.
The preparation of metakaolin base pulpous state properties-correcting agent: metakaolin and flyash in mass ratio 1:1 mix and is placed in beater and breaks up 10min, at stirrer for mixing 3min, add again the water that accounts for butt mass percent 100wt% to stir 15min, obtain metakaolin base pulpous state properties-correcting agent.
By ready each raw material according to the proportioning mix of table 1 (weight package of adulterant containing wherein moisture weight), wherein A1 is benchmark sample, A2 is for adding above-mentioned dry powder metakaolin sample, A3 is the sample that adds metakaolin slurry in the present embodiment, A4 is the sample that adds metakaolin base pulpous state properties-correcting agent in the present embodiment, measures the degree of mobilization of obtained mortar specimen with reference to the husky degree of mobilization measuring method of GB/T2419-2005 < < cement gel > >.
The impact of table 1 metakaolin base mineral slurries flow degree
Sample A 2 has added Powdered metakaolin afterwards with respect to reference cement Sample A 1 as can be seen from Table 1, and the degree of mobilization of mortar significantly reduces; After metakaolin is made to slurry as stated above, add Sample A 3 mobility in cement also to have larger reduction with respect to A1, but increase with respect to A2; Added the degree of mobilization of the A4 of metakaolin base pulpous state properties-correcting agent to be slightly higher than benchmark sample A1, illustrate as stated above metakaolin to be made and can improve metakaolin after slurry and add the impact on its mobility after sand-cement slurry with dry powder, can eliminate its impact on mortar mobility after further metakaolin being made to metakaolin base pulpous state properties-correcting agent.
Embodiment 2
The proportioning mix (weight package of slurry is containing wherein moisture weight) of gained raw material in embodiment 1 being pressed to table 2, the preparation method of metakaolin slurry and metakaolin base pulpous state properties-correcting agent is identical with embodiment 1; Wherein B1 is benchmark sample, B2 is for adding above-mentioned dry powder metakaolin sample, B3 is the sample that adds metakaolin slurry, B4 is the sample that adds metakaolin base pulpous state properties-correcting agent, the water consumption of adjusting in test each proportioning makes its mobility all at 170 ± 5mm, and wherein the mensuration of degree of mobilization is with reference to the husky degree of mobilization measuring method of GB/T2419-2005 < < cement gel > >.The glue sand test specimen of moulding 40mm * 40mm * 160mm in experiment, 20 ± 2 ℃ of temperature, humidity is maintenance in more than 90% standard curing box, then with reference to GB/T17671-1999 < < Test method for strength of hydraulic cement mortar > >, measures respectively the intensity in its each length of time.
The proportioning of each sample raw material of table 2
| Numbering | Cement/g | Additive/g | Sand/g | Water/g |
| B1 | 450 | 0 | 1350 | 213 |
| B2 | 405 | 45(metakaolin powder) | 1350 | 225 |
| B3 | 405 | 90(metakaolin slurry) | 1350 | 174 |
| B4 | 405 | 90(metakaolin base pulpous state properties-correcting agent) | 1350 | 164 |
The impact of table 3 metakaolin base mineral slurries on intensity
Table 2 can be found out the mobility that reaches identical, and the water that the sample B 4 of metakaolin base pulpous state properties-correcting agent adds is minimum; Respectively organizing mortar strength and can find out from table 3, add the test specimen B3 of metakaolin slurry with respect to dry powder metakaolin being added to the test specimen B2 of mortar, early stage and later strength all increases, added the sample B semi-finals degree of metakaolin base pulpous state properties-correcting agent maximum, and early stage and later strength all increases significantly with respect to benchmark sample B1,3d gain in strength 4.6MPa, increasing degree has 14.2%, 28d gain in strength 13.7MPa, increasing degree reaches 26.2%.
Embodiment 3
Gained raw material in embodiment 1 is pressed to the proportioning mix (weight package of slurry is containing wherein moisture weight) of table 4, the preparation method of metakaolin base pulpous state properties-correcting agent is identical with embodiment 1, described water reducer is liquid polycarboxylic acids dehydragent, and water-reducing rate is not less than 20%.
With reference to JBJ55-2000 < < design of common concrete proportioning rules > >, in metakaolin base pulpous state properties-correcting agent, butt weight is calculated, and replaces respectively 0%, 10%, 20% cement and prepares concrete sample C1, C2, C3.Maintenance in the standard curing box of 20 ℃ of temperature, humidity 95% after shaping and demoulding, and according to GBT50081-2002 < < standard for test methods of mechanical properties of ordinary concrete > >, carry out the test of 3d, 7d and 28d ultimate compression strength, concrete match ratio when ultimate compression strength in Table 4.
Table 4 is containing the concrete match ratio of metakaolin base mineral slurries ultimate compression strength when
From result: the concrete that has added metakaolin base pulpous state properties-correcting agent, the ultimate compression strength of 3d, 7d, 28d is all greatly improved, the gain in strength of 3d is in 10% left and right, the highest enhancing 19.3% of 28d, and along with the increase of metakaolin base pulpous state content of modifier, the ultimate compression strength in each age phase all increases thereupon.In sum, table 4 presentation of results: the metakaolin base pulpous state properties-correcting agent for preparing can effectively improve cement concrete in early days with the intensity of middle and later periods, and along with the increase of volume, intensity also increases thereupon.In addition, from table 4, also can find out, mix metakaolin base pulpous state properties-correcting agent afterwards on the not impact of the concrete slump, not affect concrete serviceability.
Embodiment 4
The preparation of metakaolin base pulpous state properties-correcting agent: by the metakaolin after breaing up respectively and flyash in mass ratio 2:8 be placed in stirrer for mixing 3min and form butt, add again the water that accounts for butt mass percent 50% to stir 15min, obtain metakaolin base pulpous state properties-correcting agent 1; By the metakaolin after breaing up respectively and flyash in mass ratio 8:2 be placed in stirrer for mixing 3min and form butt, then add the water that accounts for butt mass percent 200% to stir 15min, obtain metakaolin base pulpous state properties-correcting agent 2.
By ready each raw material according to the proportioning mix of table 5 (weight package of adulterant containing wherein moisture weight), wherein D1 is benchmark sample, D2 is for adding dry powder metakaolin sample, D3 is the sample that adds metakaolin base pulpous state properties-correcting agent 1 in the present embodiment, D4 is the sample that adds metakaolin base pulpous state properties-correcting agent 2 in the present embodiment, measures the degree of mobilization of obtained mortar specimen with reference to the husky degree of mobilization measuring method of GB/T2419-2005 < < cement gel > >.The glue sand test specimen of moulding 40mm * 40mm * 160mm in experiment, 20 ± 2 ℃ of temperature, humidity is maintenance in more than 90% standard curing box, then with reference to GB/T17671-1999 < < Test method for strength of hydraulic cement mortar > >, measures respectively the intensity in its each length of time.
The proportioning of each sample raw material of table 5
| Numbering | Cement/g | Additive/g | Sand/g | Water/g | Mobility/mm |
| D1 | 450 | 0 | 1350 | 225 | 184 |
| D2 | 405 | 45(metakaolin powder) | 1350 | 225 | 162 |
| D3 | 405 | 67.5(metakaolin base pulpous state properties-correcting agent 1) | 1350 | 202.5 | 196 |
| D4 | 405 | 135(metakaolin base pulpous state properties-correcting agent 2) | 1350 | 135 | 176 |
The impact of table 6 metakaolin base mineral slurries on intensity
As can be seen from Table 6, guarantee under the identical prerequisite of sample moisture, added metakaolin base pulpous state properties-correcting agent 1 and metakaolin base pulpous state properties-correcting agent 2 sample D3 and D4 mobility and intensity with respect to adding the sample D2 of metakaolin powder all increase, D3 mobility with respect to benchmark sample D1 becomes better, mobility has increased 12mm, 28d gain in strength 19.1%, D4 mobility with respect to benchmark sample D1 decreases slightly, reduced 8mm, but reinforced effects is better than D3, D4 28d gain in strength 22% with respect to benchmark sample D1.
Claims (7)
1. for a concrete metakaolin base pulpous state properties-correcting agent, it is characterized in that the butt being comprised of metakaolin and flyash adds water again and mixes.
2. as claimed in claim 1ly for concrete metakaolin base pulpous state properties-correcting agent, it is characterized in that in described butt, metakaolin volume is 20%～80wt%, the volume of flyash is 20%～80wt%, and the volume of water is 50%～200% of butt quality.
3. as claimed in claim 1 or 2 for concrete metakaolin base pulpous state properties-correcting agent, it is characterized in that described metakaolin prepares as follows:
Temperature lower calcination 2～4h by kaolin powder at 600 ℃～850 ℃, cooling after, with beater, break up, median size is below 8 μ m; Described kaolin powder Al
2o
3and SiO
2content more than 70wt%.
4. as claimed in claim 1 or 2 for concrete metakaolin base pulpous state properties-correcting agent, it is characterized in that described flyash is to receive the thin ash of catching in the flue gas after thermal power plant coal burning, profile is pearl particle, median size is below 10 μ m; Described flyash Al
2o
3and SiO
2content more than 50wt%.
5. for a preparation method for concrete metakaolin base pulpous state properties-correcting agent, it is characterized in that comprising the following steps:
Respectively by metakaolin, flyash dry for standby; The metakaolin of having dried, flyash are placed in respectively to beater and disperse 10～15min; Mix and blend 3min forms butt, then adds water stirring 10～15min and makes metakaolin base pulpous state properties-correcting agent; In described butt, metakaolin volume is 20%～80wt%, and the volume of flyash is 20%～80wt%, and the volume of water is 50%～200% of butt quality.
6. the preparation method for concrete metakaolin base pulpous state properties-correcting agent as described in claim 5 or 6, is characterized in that described metakaolin prepares as follows:
Temperature lower calcination 2～4h by kaolin powder at 600 ℃～850 ℃, cooling after, with beater, break up, median size is below 8 μ m; Described kaolin powder Al
2o
3and SiO
2content more than 70wt%.
7. the preparation method for concrete metakaolin base pulpous state properties-correcting agent as described in claim 5 or 6, it is characterized in that described flyash is to receive the thin ash of catching in the flue gas after thermal power plant coal burning, profile is pearl particle, and median size is below 10 μ m; Described flyash Al
2o
3and SiO
2content more than 50wt%.
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| CN106986573A (en) * | 2017-04-12 | 2017-07-28 | 茂名高岭科技有限公司 | A kind of metakaolin ardealite base reinforced cement base material economization agent and preparation method thereof |
| CN107098613A (en) * | 2017-04-28 | 2017-08-29 | 武汉理工大学 | A kind of pulpous state metakaolin base concrete admixture and preparation method and application |
| CN110156408A (en) * | 2019-07-03 | 2019-08-23 | 兰州理工大学 | A kind of high-performance nano fibre modification polyalcohol cement basis repairing mortar and its preparation |
| CN113321474A (en) * | 2021-07-21 | 2021-08-31 | 四川佰汇混凝土工程有限公司 | Anti-seepage sprayed concrete |
| CN116409947A (en) * | 2023-03-03 | 2023-07-11 | 昆明理工大学 | High-performance self-leveling cement and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106986573A (en) * | 2017-04-12 | 2017-07-28 | 茂名高岭科技有限公司 | A kind of metakaolin ardealite base reinforced cement base material economization agent and preparation method thereof |
| CN106986573B (en) * | 2017-04-12 | 2020-05-15 | 茂名高岭科技有限公司 | Metakaolin-phosphogypsum-based enhanced cement-based material shrinkage reducing agent and preparation method thereof |
| CN107098613A (en) * | 2017-04-28 | 2017-08-29 | 武汉理工大学 | A kind of pulpous state metakaolin base concrete admixture and preparation method and application |
| CN110156408A (en) * | 2019-07-03 | 2019-08-23 | 兰州理工大学 | A kind of high-performance nano fibre modification polyalcohol cement basis repairing mortar and its preparation |
| CN113321474A (en) * | 2021-07-21 | 2021-08-31 | 四川佰汇混凝土工程有限公司 | Anti-seepage sprayed concrete |
| CN116409947A (en) * | 2023-03-03 | 2023-07-11 | 昆明理工大学 | High-performance self-leveling cement and preparation method thereof |
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