CN112851259A - Self-compacting concrete and preparation method thereof - Google Patents
Self-compacting concrete and preparation method thereof Download PDFInfo
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- CN112851259A CN112851259A CN202110180910.2A CN202110180910A CN112851259A CN 112851259 A CN112851259 A CN 112851259A CN 202110180910 A CN202110180910 A CN 202110180910A CN 112851259 A CN112851259 A CN 112851259A
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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 self-compacting concrete and a preparation method thereof, wherein the self-compacting concrete comprises the following raw materials in parts by weight: 140 parts of water 125-containing material, 530 parts of cement 515-containing material, 70-85 parts of fly ash, 70-80 parts of mineral powder, 90-100 parts of silica fume, 10-20 parts of expanding agent, 620 parts of fine aggregate 570-containing material, 1010 parts of coarse aggregate 980-containing material, 20-30 parts of steel fiber and 27-32 parts of water reducing agent. The raw material components of the invention meet the concrete strength C100 in proportion, have the design of compensation shrinkage, improve the compressive strength of the concrete by the blending of different raw materials, have good impervious grade, and have high flow state, high working performance, the expansion degree remains stable, after being mixed uniformly, the invention has no layering, bleeding, aggregate accumulation and obvious stone exposure, the wrapping property is good, the cohesiveness is moderate, and the invention has no segregation and no bleeding.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to self-compacting concrete and a preparation method thereof.
Background
The high-strength self-compacting concrete has the strength not lower than C60, high flowability, no segregation and no bleeding, and can fill the space in the die directly under the action of self weight (without vibration) and be automatically compacted. Compared with the common high-strength concrete, the high-strength self-compacting concrete has a great deal of advantages and construction advantages, not only has the advantages of the high-strength concrete, but also has the characteristics of the self-compacting concrete, is a novel building material, can greatly save the construction time, and is not only safe and reliable, but also energy-saving and environment-friendly. At present, many engineering positions are constructed by using self-compacting concrete, and the requirements on various indexes of the self-compacting concrete are increased, so that the method for realizing the self-compacting concrete with higher performance has extremely high research value.
Disclosure of Invention
The invention mainly aims to provide self-compacting concrete, and aims to provide self-compacting concrete with high strength and high performance.
In order to achieve the purpose, the invention provides self-compacting concrete which comprises the following raw materials in parts by weight: 140 parts of water 125-containing material, 530 parts of cement 515-containing material, 70-85 parts of fly ash, 70-80 parts of mineral powder, 90-100 parts of silica fume, 10-20 parts of expanding agent, 620 parts of fine aggregate 570-containing material, 1010 parts of coarse aggregate 980-containing material, 20-30 parts of steel fiber and 27-32 parts of water reducing agent.
Optionally, the coarse aggregate is crushed stone with a particle size of 5-16mm, and the content of needle-shaped and flaky particles is not more than 5.0%, the content of mud is not more than 0.2%, and the content of mud lumps is not more than 0.2%.
Optionally, the coarse aggregates include a first coarse aggregate and a second coarse aggregate, the first coarse aggregate is crushed stone with a particle size of 5-10mm, and the second coarse aggregate is crushed stone with a particle size of 10-16mm, wherein the second coarse aggregate is higher than the first coarse aggregate in parts by mass in the dense concrete.
Optionally, the mud content of the coarse aggregate is 0; and/or the presence of a gas in the gas,
the additive is a retarding polycarboxylic acid high-performance water reducing agent.
Optionally, the fineness modulus of the fine aggregate is 3.0-3.2, the mud content is not more than 2%, and the mud block content is not more than 0.25%.
Optionally, the content of the fine aggregate is 0.7% and the content of the clod is 0.
Optionally, the silica content of the silica fume is not less than 95%; and/or the presence of a gas in the gas,
the specific surface area of the mineral powder is not less than 500m2/kg, and/or,
the specific surface area of the expanding agent is not less than 200m2/kg。
Optionally, the cement is portland cement, and the specific surface area of the cement is not less than 300m2/kg。
Optionally, the coarse aggregate comprises a first coarse aggregate and a second coarse aggregate, the particle size of the first coarse aggregate is 5-10mm broken stone, the particle size of the second coarse aggregate is 10-16mm broken stone, and the self-compacting concrete comprises the following raw materials in parts by weight: 129 parts of water, 515 parts of cement, 78 parts of fly ash, 78 parts of mineral powder, 94 parts of silica fume, 15 parts of an expanding agent, 585 parts of fine aggregate, 199 parts of first coarse aggregate, 796 parts of second coarse aggregate, 25 parts of steel fiber and 27.3 parts of a water reducing agent.
Based on the formula of the concrete, the invention also provides a preparation method of the self-compacting concrete, which comprises the following steps:
mixing and stirring cement, fly ash, mineral powder, silica fume, fine aggregate, steel fiber and a part of coarse aggregate uniformly, adding a part of water, and stirring until the mixture is uniformly mixed;
and adding the rest of coarse aggregate, the expanding agent, the water reducing agent and the rest of water in sequence, and fully stirring to prepare the self-compacting concrete.
In the technical scheme of the invention, the self-compacting concrete comprises the following raw material components: water, cement, fly ash, mineral powder, silica fume, an expanding agent, fine aggregate, coarse aggregate, steel fiber and an additive. The raw material components of the invention meet the design of compensation shrinkage, the compressive strength of the concrete is improved by blending different raw materials, the concrete has good anti-permeability grade, high flow state and high working performance, the expansibility is kept stable, no layering, bleeding, aggregate accumulation and obvious stone exposure phenomenon are caused after uniform mixing, the wrapping property is good, the cohesiveness is moderate, and no segregation and no bleeding occur.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments.
It should be noted that those whose specific conditions are not specified in the examples were performed according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
With the development of infrastructure in China, the requirement of the civil engineering field on concrete is increasingly intensified. According to the construction to be repaired, a self-compacting concrete meeting the following performance requirements needs to be designed:
the average value of the 28-day compressive strength is not lower than 110MPa, and the minimum value is not lower than 95 MPa;
the concrete meets the self-compactness, has high flow state and high working performance, the expansion degree is not less than 650mm, the 90-min expansion degree is not lost, the T500 time is 5-10s, the concrete mixture has no layering and bleeding, the aggregate is stacked and combined with obvious stone exposure, the wrapping property is good, the cohesiveness is moderate, the segregation is avoided, and the bleeding is avoided;
a barrier rating of P12 or greater;
the expansion rate of the concrete can reach two ten-thousandth.
In view of the above, the present invention provides a self-compacting concrete, which comprises the following raw materials in parts by weight: 140 parts of water 125-containing material, 530 parts of cement 515-containing material, 70-85 parts of fly ash, 70-80 parts of mineral powder, 90-100 parts of silica fume, 10-20 parts of expanding agent, 620 parts of fine aggregate 570-containing material, 1010 parts of coarse aggregate 980-containing material, 20-30 parts of steel fiber and 27-32 parts of water reducing agent.
In the technical scheme of the invention, the self-compacting concrete comprises the following raw material components: water, cement, fly ash, mineral powder, silica fume, an expanding agent, fine aggregate, coarse aggregate, steel fiber and an additive. The raw material components of the invention meet the design of compensation shrinkage, the compressive strength of the concrete is improved by blending different raw materials, the concrete has good anti-permeability grade, high flow state and high working performance, the expansibility is kept stable, no layering, bleeding, aggregate accumulation and obvious stone exposure phenomenon are caused after uniform mixing, the wrapping property is good, the cohesiveness is moderate, and no segregation and no bleeding occur.
The coarse aggregate is sand and stone particles with the particle size of more than 5mm in concrete, mainly plays a role of a skeleton, specifically, the selection standard of the coarse aggregate can be quantified into broken stones with the particle size of 5-16mm, and the contents of needle and flaky particles are not more than 5.0%, the content of mud is not more than 0.2%, and the content of mud blocks is not more than 0.2%. The needle, the flaky particle content, the sludge content, and the sludge cake content are all expressed in weight percent (wt%).
In the process of searching for selection of each raw material component of concrete by the inventor, the selected raw material is preferably selected as a coarse aggregate, the mud content of the coarse aggregate is 0, the crushing index is 3.4%, and the alkali-aggregate reaction inhibition efficiency test needs to be carried out in the proportioning process.
The concrete admixture is a chemical substance which is added in the process of stirring the concrete and can obviously improve the performance of the concrete. The admixture has the characteristics of multiple varieties, small mixing amount, great influence on the performance of concrete, low investment, quick response and obvious technical and economic benefits, and in the embodiment of the invention, the admixture is a retarding polycarboxylic acid high-performance water reducing agent, and the water reducing rate is not less than 30%. Can reduce the mixing water consumption under the condition of maintaining the concrete slump constant basically.
Further, concrete obtained after coarse aggregates with different particle sizes are proportioned has different quality, in an embodiment of the invention, the coarse aggregates comprise a first coarse aggregate and a second coarse aggregate, the first coarse aggregate is broken stone with a particle size of 5-10mm, the second coarse aggregate is broken stone with a particle size of 10-16mm, and the mass part of the second coarse aggregate in the dense concrete is higher than that of the first coarse aggregate. And (3) debugging the blending of the first coarse aggregate and the second coarse aggregate, and performing an alkali-aggregate reaction inhibition efficiency test when the aggregate confirms that the alkali-silicate reaction 14d rapid mortar rod method expansion rate is more than or equal to 0.10% and less than 0.20%, wherein the test proves that the inhibition is effective.
The fine aggregate is coarse sand in the area II, and the selection standard of the fine aggregate can be quantized to the fineness modulus of 3.0-3.2, the mud content is not more than 2%, and the mud block content is not more than 0.25%. The same aggregate confirms that when the expansion rate of the alkali-silicate reaction 14d rapid mortar rod method is more than or equal to 0.10 percent and less than 0.20 percent, an alkali-aggregate reaction inhibition efficiency test is carried out, and the test proves that the inhibition is effective. Furthermore, the content of the fine aggregate is 0.7 percent, and the content of the mud blocks is 0 percent.
In addition, the other components should meet the following criteria: the silicon dioxide content of the silica fume is not less than 95 percent;the specific surface area of the mineral powder is not less than 500m2Per kg; the specific surface area of the expanding agent is not less than 200m2Per kg; the cement is Portland cement, and the specific surface area of the cement is not less than 300m2The pH value of the blending water is more than 6.5 per kg.
In the process of searching the mixture ratio of the raw material components of the concrete, the inventor finds that in the concrete system, the influence of different proportions on the strength of the concrete has nonuniformity, and as a preferred embodiment, the coarse aggregate comprises a first coarse aggregate and a second coarse aggregate, the particle size of the first coarse aggregate is 5-10mm broken stone, the particle size of the second coarse aggregate is 10-16mm broken stone, and the self-compacting concrete comprises the following raw materials in parts by weight: 129 parts of water, 515 parts of cement, 78 parts of fly ash, 78 parts of mineral powder, 94 parts of silica fume, 15 parts of an expanding agent, 585 parts of fine aggregate, 199 parts of first coarse aggregate, 796 parts of second coarse aggregate, 25 parts of steel fiber and 27.3 parts of a water reducing agent. In the test verification process, the mould is demoulded for one day, the quick culture is carried out for three days (boiling in water at 90 ℃), indexes such as the compressive strength, the expansion degree and the like can reach the design requirements, and the stability is the best.
Based on the formula of the concrete, the invention also provides a preparation method of the self-compacting concrete, which is used for preparing the self-compacting concrete. The preparation method of the self-compacting concrete comprises the following steps:
step S10: mixing and stirring cement, fly ash, mineral powder, silica fume, fine aggregate, steel fiber and a part of coarse aggregate uniformly, adding a part of water, and stirring until the mixture is uniformly mixed;
step S20: and adding the rest of coarse aggregate, the expanding agent, the water reducing agent and the rest of water in sequence, and fully stirring to prepare the self-compacting concrete.
The technical solutions of the present invention are further described in detail with reference to the following specific examples, which should be understood as merely illustrative and not limitative.
Example 1
(1) Weighing the raw material components according to the following formula: 125 parts of water, 515 parts of cement and 7 parts of fly ash0 part, 70 parts of mineral powder, 90 parts of silica fume, 10 parts of an expanding agent, 570 parts of fine aggregate, 980 parts of coarse aggregate, 20 parts of steel fiber and 27 parts of a water reducing agent. Wherein the coarse aggregate is broken stone with the particle size of 5-16mm, the content of needle and sheet particles is not more than 5.0 percent, the mud content of the coarse aggregate is 0, the content of mud blocks is not more than 0.2 percent, the cement is portland cement, and the specific surface area of the cement is not less than 300m2In terms of/kg. The fineness modulus of the fine aggregate is 3.0-3.2, the mud content is not more than 2%, and the mud block content is 0. The silicon dioxide content of the silica fume is not less than 95 percent, and the specific surface area of the mineral powder is not less than 500m2Per kg, the specific surface area of the expanding agent is not less than 200m2In terms of/kg. The pH value of the blending water is more than 6.5.
(2) Mixing and stirring cement, fly ash, mineral powder, silica fume, fine aggregate, steel fiber and a part of coarse aggregate uniformly, adding a part of water, stirring until the mixture is uniformly mixed, and controlling the rotating speed and the stirring time of the mixer.
(3) And sequentially adding the rest of coarse aggregate and the expanding agent into the mixture, continuously stirring, uniformly dispersing the water reducing agent in the rest of water, adding the mixture into a mixing stirrer filled with solid raw materials, and molding and cooling the mixture by using a mold to prepare the self-compacting concrete.
Example 2
(1) Weighing the raw material components according to the following formula: 140 parts of water, 530 parts of cement, 85 parts of fly ash, 80 parts of mineral powder, 100 parts of silica fume, 20 parts of an expanding agent, 620 parts of fine aggregate, 1010 parts of coarse aggregate, 30 parts of steel fiber and 32 parts of a water reducing agent. Wherein the coarse aggregate is broken stone with the particle size of 5-16mm, the content of needle and sheet particles is not more than 5.0 percent, the mud content of the coarse aggregate is 0, the content of mud blocks is not more than 0.2 percent, the cement is portland cement, and the specific surface area of the cement is not less than 300m2In terms of/kg. The fineness modulus of the fine aggregate is 3.0-3.2, the mud content is not more than 2%, and the mud block content is 0. The silicon dioxide content of the silica fume is not less than 95 percent, and the specific surface area of the mineral powder is not less than 500m2Per kg, the specific surface area of the expanding agent is not less than 200m2In terms of/kg. The pH value of the blending water is more than 6.5.
(2) Mixing and stirring cement, fly ash, mineral powder, silica fume, fine aggregate, steel fiber and a part of coarse aggregate uniformly, adding a part of water, stirring until the mixture is uniformly mixed, and controlling the rotating speed and the stirring time of the mixer.
(3) And sequentially adding the rest of coarse aggregate and the expanding agent into the mixture, continuously stirring, uniformly dispersing the water reducing agent in the rest of water, adding the mixture into a mixing stirrer filled with solid raw materials, and molding and cooling the mixture by using a mold to prepare the self-compacting concrete.
Example 3
(1) Weighing the raw material components according to the following formula: 133 parts of water, 515 parts of cement, 78 parts of fly ash, 78 parts of mineral powder, 94 parts of silica fume, 15 parts of an expanding agent, 612 parts of fine aggregate, 199 parts of coarse aggregate with the particle size of 5-10mm, 798 parts of coarse aggregate with the particle size of 10-16mm, 25 parts of steel fiber and 31.2 parts of a water reducing agent. Wherein, the content of needle and sheet particles of the coarse aggregate is not more than 5.0 percent, the mud content of the coarse aggregate is 0, the mud block content is not more than 0.2 percent, the cement is Portland cement, and the specific surface area of the cement is not less than 300m2In terms of/kg. The fineness modulus of the fine aggregate is 3.0-3.2, the mud content is not more than 2%, and the mud block content is 0. The silicon dioxide content of the silica fume is not less than 95 percent, and the specific surface area of the mineral powder is not less than 500m2Per kg, the specific surface area of the expanding agent is not less than 200m2In terms of/kg. The pH value of the blending water is more than 6.5.
(2) Mixing and stirring cement, fly ash, mineral powder, silica fume, fine aggregate, steel fiber and coarse aggregate with the particle size of 5-10mm uniformly, adding part of water, stirring until the mixture is uniformly mixed, and controlling the rotating speed and the stirring time of a mixing stirrer.
(3) Adding coarse aggregate with the particle size of 10-16mm and an expanding agent into the mixture in sequence, continuing stirring, dispersing the water reducing agent in the rest water uniformly, adding the mixture into a mixing stirrer filled with solid raw materials, and preparing the self-compacting concrete after mould forming and cooling.
The test results showed that T500 was 8.4 seconds, the spread was 690mm-680mm, demolded by one day, fasted for three days (poaching at 90 ℃ C.), and the average strength was 101.6 MPa.
Example 4
(1) Weighing the raw material components according to the following formula: 133 parts of water, 530 parts of cement, 63 parts of fly ash, 78 parts of mineral powder, 94 parts of silica fume, 15 parts of an expanding agent, 579 parts of fine aggregate, 206 parts of coarse aggregate with the particle size of 5-10mm, 824 parts of coarse aggregate with the particle size of 10-16mm, 25 parts of steel fiber and 31.2 parts of a water reducing agent. Wherein, the content of needle and sheet particles of the coarse aggregate is not more than 5.0 percent, the mud content of the coarse aggregate is 0, the mud block content is not more than 0.2 percent, the cement is Portland cement, and the specific surface area of the cement is not less than 300m2In terms of/kg. The fineness modulus of the fine aggregate is 3.0-3.2, the mud content is not more than 2%, and the mud block content is 0. The silicon dioxide content of the silica fume is not less than 95 percent, and the specific surface area of the mineral powder is not less than 500m2Per kg, the specific surface area of the expanding agent is not less than 200m2In terms of/kg. The pH value of the blending water is more than 6.5.
(2) Mixing and stirring cement, fly ash, mineral powder, silica fume, fine aggregate, steel fiber and coarse aggregate with the particle size of 5-10mm uniformly, adding part of water, stirring until the mixture is uniformly mixed, and controlling the rotating speed and the stirring time of a mixing stirrer.
(3) Adding coarse aggregate with the particle size of 10-16mm and an expanding agent into the mixture in sequence, continuing stirring, dispersing the water reducing agent in the rest water uniformly, adding the mixture into a mixing stirrer filled with solid raw materials, and preparing the self-compacting concrete after mould forming and cooling.
The test results showed that T500 was 8.2 seconds, the spread was 690-700 mm, demolded by one day, fasted for three days (poaching at 90 ℃ C.), and the average strength was 100.9 MPa.
Example 5
(1) Weighing the raw material components according to the following formula: 129 parts of water, 515 parts of cement, 78 parts of fly ash, 78 parts of mineral powder, 94 parts of silica fume, 15 parts of an expanding agent, 585 parts of fine aggregate, 199 parts of coarse aggregate with the particle size of 5-10mm, 796 parts of coarse aggregate with the particle size of 10-16mm, 25 parts of steel fiber and 27.3 parts of a water reducing agent. Wherein, the content of needle and sheet particles of the coarse aggregate is not more than 5.0 percent, the mud content of the coarse aggregate is 0, the mud block content is not more than 0.2 percent, and the cement is silicateCement, and the specific surface area of the cement is not less than 300m2In terms of/kg. The fineness modulus of the fine aggregate is 3.0-3.2, the mud content is not more than 2%, and the mud block content is 0. The silicon dioxide content of the silica fume is not less than 95 percent, and the specific surface area of the mineral powder is not less than 500m2Per kg, the specific surface area of the expanding agent is not less than 200m2In terms of/kg. The pH value of the blending water is more than 6.5.
(2) Mixing and stirring cement, fly ash, mineral powder, silica fume, fine aggregate, steel fiber and coarse aggregate with the particle size of 5-10mm uniformly, adding part of water, stirring until the mixture is uniformly mixed, and controlling the rotating speed and the stirring time of a mixing stirrer.
(3) Adding coarse aggregate with the particle size of 10-16mm and an expanding agent into the mixture in sequence, continuing stirring, dispersing the water reducing agent in the rest water uniformly, adding the mixture into a mixing stirrer filled with solid raw materials, and preparing the self-compacting concrete after mould forming and cooling.
The test results showed a T500 of 8.7 seconds, an extension of 680mm, a one-day demold, a three-day quick-cure (90 ℃ poaching), and an average strength of 116.9 MPa.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the present specification and directly/indirectly applied to other related technical fields within the spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. The self-compacting concrete is characterized by comprising the following raw materials in parts by weight: 140 parts of water 125-containing material, 530 parts of cement 515-containing material, 70-85 parts of fly ash, 70-80 parts of mineral powder, 90-100 parts of silica fume, 10-20 parts of expanding agent, 620 parts of fine aggregate 570-containing material, 1010 parts of coarse aggregate 980-containing material, 20-30 parts of steel fiber and 27-32 parts of water reducing agent.
2. The self-compacting concrete according to claim 1, wherein the coarse aggregate is crushed stone having a particle size of 5 to 16mm, and has a needle and flake particle content of not more than 5.0%, a sludge content of not more than 0.2%, and a sludge cake content of not more than 0.2%.
3. The self-compacting concrete according to claim 2, wherein the coarse aggregates comprise a first coarse aggregate and a second coarse aggregate, the first coarse aggregate is crushed stone with a particle size of 5-10mm, the second coarse aggregate is crushed stone with a particle size of 10-16mm, and the mass fraction of the second coarse aggregate in the compacted concrete is higher than that of the first coarse aggregate.
4. The self-compacting concrete according to claim 2, wherein said coarse aggregate has a mud content of 0; and/or the presence of a gas in the gas,
the additive is a retarding polycarboxylic acid high-performance water reducing agent.
5. The self-compacting concrete as claimed in claim 1, wherein the fineness modulus of the fine aggregate is 3.0 to 3.2, the mud content is not more than 2%, and the mud cake content is not more than 0.25%.
6. The self-compacting concrete according to claim 5, wherein said fine aggregate has a mud content of 0.7% and a mud cake content of 0.
7. The self-compacting concrete of claim 1, wherein said silica fume has a silica content of not less than 95%; and/or the presence of a gas in the gas,
the specific surface area of the mineral powder is not less than 500m2/kg, and/or,
the specific surface area of the expanding agent is not less than 200m2/kg。
8. The self-compacting concrete according to claim 1, wherein said cement is portland cement and has a specific surface area of not less than 300m2/kg。
9. The self-compacting concrete as claimed in claim 1, wherein the coarse aggregate comprises a first coarse aggregate and a second coarse aggregate, the particle size of the first coarse aggregate is 5-10mm broken stone, the particle size of the second coarse aggregate is 10-16mm broken stone, and the self-compacting concrete comprises the following raw materials in parts by weight: 129 parts of water, 515 parts of cement, 78 parts of fly ash, 78 parts of mineral powder, 94 parts of silica fume, 15 parts of an expanding agent, 585 parts of fine aggregate, 199 parts of first coarse aggregate, 796 parts of second coarse aggregate, 25 parts of steel fiber and 27.3 parts of a water reducing agent.
10. A method for preparing a self-compacting concrete according to any one of claims 1 to 9, characterized in that it comprises the following steps:
mixing and stirring cement, fly ash, mineral powder, silica fume, fine aggregate, steel fiber and a part of coarse aggregate uniformly, adding a part of water, and stirring until the mixture is uniformly mixed;
and adding the rest of coarse aggregate, the expanding agent, the water reducing agent and the rest of water in sequence, and fully stirring to prepare the self-compacting concrete.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113336508A (en) * | 2021-06-30 | 2021-09-03 | 中际远宏(福建)建设发展有限公司 | Self-compacting concrete and construction method thereof |
| CN113716887A (en) * | 2021-09-14 | 2021-11-30 | 中铁十一局集团桥梁有限公司 | Concrete composite admixture and concrete |
| CN114573311A (en) * | 2022-03-01 | 2022-06-03 | 江苏佳核新能源科技有限公司 | Formula and production process of precast concrete member material |
| CN114685118A (en) * | 2021-12-21 | 2022-07-01 | 山东高速基础设施建设有限公司 | High-strength self-compacting concrete suitable for steel-concrete combined section and preparation method thereof |
| CN115010434A (en) * | 2022-06-13 | 2022-09-06 | 湖南省第三工程有限公司 | Self-compacting concrete and preparation method thereof |
| CN115304326A (en) * | 2022-08-08 | 2022-11-08 | 杭萧钢构股份有限公司 | Shrinkage-compensating self-compacting concrete and preparation method thereof |
| CN115536340A (en) * | 2022-10-25 | 2022-12-30 | 中铁二十四局集团安徽工程有限公司 | C60 high-performance self-compacting concrete suitable for arch structure and preparation method thereof |
| CN115594465A (en) * | 2022-11-07 | 2023-01-13 | 北京市高强混凝土有限责任公司（Cn） | Lightweight ultrahigh-performance concrete |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103304206A (en) * | 2013-06-28 | 2013-09-18 | 深圳大学 | Ultrahigh-strength self-compacting concrete and preparation method thereof |
| CN105198339A (en) * | 2015-10-28 | 2015-12-30 | 上海罗洋新材料科技有限公司 | Ultrahigh-performance cement-based composite material |
| CN112209683A (en) * | 2020-10-16 | 2021-01-12 | 宜春学院 | Self-compacting C120 ready-mixed dry material concrete and preparation method thereof |
-
2021
- 2021-02-08 CN CN202110180910.2A patent/CN112851259A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103304206A (en) * | 2013-06-28 | 2013-09-18 | 深圳大学 | Ultrahigh-strength self-compacting concrete and preparation method thereof |
| CN105198339A (en) * | 2015-10-28 | 2015-12-30 | 上海罗洋新材料科技有限公司 | Ultrahigh-performance cement-based composite material |
| CN112209683A (en) * | 2020-10-16 | 2021-01-12 | 宜春学院 | Self-compacting C120 ready-mixed dry material concrete and preparation method thereof |
Non-Patent Citations (3)
| Title |
|---|
| 彭园等: "骨料对140MPa强度等级混凝土性能的影响研究", 《混凝土与水泥制品》 * |
| 李进等: "钢纤维和膨胀剂对自密实混凝土增韧与阻裂效应的研究", 《新型建筑材料》 * |
| 赵志强等: "《混凝土生产工艺与治理控制》", 31 May 2017, 中国建材工业出版社 * |
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| CN113336508A (en) * | 2021-06-30 | 2021-09-03 | 中际远宏(福建)建设发展有限公司 | Self-compacting concrete and construction method thereof |
| CN113716887A (en) * | 2021-09-14 | 2021-11-30 | 中铁十一局集团桥梁有限公司 | Concrete composite admixture and concrete |
| CN114685118A (en) * | 2021-12-21 | 2022-07-01 | 山东高速基础设施建设有限公司 | High-strength self-compacting concrete suitable for steel-concrete combined section and preparation method thereof |
| CN114573311A (en) * | 2022-03-01 | 2022-06-03 | 江苏佳核新能源科技有限公司 | Formula and production process of precast concrete member material |
| CN115010434A (en) * | 2022-06-13 | 2022-09-06 | 湖南省第三工程有限公司 | Self-compacting concrete and preparation method thereof |
| CN115304326A (en) * | 2022-08-08 | 2022-11-08 | 杭萧钢构股份有限公司 | Shrinkage-compensating self-compacting concrete and preparation method thereof |
| CN115304326B (en) * | 2022-08-08 | 2023-10-20 | 杭萧钢构股份有限公司 | Shrinkage-compensating self-compacting concrete and preparation method thereof |
| CN115536340A (en) * | 2022-10-25 | 2022-12-30 | 中铁二十四局集团安徽工程有限公司 | C60 high-performance self-compacting concrete suitable for arch structure and preparation method thereof |
| CN115594465A (en) * | 2022-11-07 | 2023-01-13 | 北京市高强混凝土有限责任公司（Cn） | Lightweight ultrahigh-performance concrete |
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