CN112592129A - Self-compacting concrete and preparation method thereof - Google Patents
Self-compacting concrete and preparation method thereof Download PDFInfo
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- CN112592129A CN112592129A CN202011489867.XA CN202011489867A CN112592129A CN 112592129 A CN112592129 A CN 112592129A CN 202011489867 A CN202011489867 A CN 202011489867A CN 112592129 A CN112592129 A CN 112592129A
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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
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a self-compacting concrete and a preparation method thereof, wherein the composition proportion of the self-compacting concrete comprises 20.04-20.45 wt% of cement, 45.14-45.54 wt% of broken stone, 26.11-26.52 wt% of medium sand, 5.84-6.28 wt% of water, 0.43-0.47 wt% of air-entraining water reducing agent and 1.42-1.82 wt% of stone powder produced at the site of a construction project; wherein the stone powder is selected from Qing mountain flour, shale stone powder or the composition thereof; therefore, the air entraining agent and the stone powder are added into the concrete to improve the fluidity and the workability of the concrete, so that the concrete meets the self-compacting requirement, and the self-compacting agent is suitable for preparing the self-compacting concrete under the condition of no concrete admixture such as fly ash, mineral powder, silica fume and the like, and can effectively reduce the construction cost and ensure the construction quality.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to preparation of concrete, and particularly relates to self-compacting concrete and a preparation method thereof.
Background
Self-Compacting Concrete (Self Compacting Concrete or Self-Compacting Concrete SCC) refers to Concrete which can flow and compact under the action of Self gravity, can completely fill a formwork even if dense steel bars exist, and simultaneously obtains good homogeneity, does not need additional external force vibration during pouring, and has high fluidity, uniformity and stability.
The self-compacting concrete is prepared by selecting and matching the additive, the cementing material and the coarse and fine aggregates and designing the mixing ratio, so that the yield stress of the concrete is reduced to be overcome by the shear stress generated by the self weight, the fluidity of the concrete is increased, and the concrete has enough plastic viscosity, so that the aggregates are suspended in the cement paste, the problems of segregation and bleeding do not occur, the aggregates can freely flow and fully fill the space in the template, and a compact and uniform gelled structure is formed.
At present, the fluidity of the self-compacting concrete in the industry is improved by adding additives and admixtures such as a high-efficiency water reducing agent, fly ash, mineral powder, silica fume, limestone powder and the like and optimizing the proportion of aggregates. It should be noted that the self-compacting concrete prepared by the conventional method requires admixtures such as fly ash, mineral powder, silica fume, limestone powder and the like to improve the rheological property of the concrete, however, the raw materials are not only of various varieties, but also are difficult to obtain in local areas of China, and the durability is reduced compared with that of the common concrete in the case of lack of the raw materials, however, if the raw materials are purchased in other places, the cost is greatly increased, and particularly, the admixtures are difficult to purchase in local areas such as Tibet and Qinghai, and the preparation difficulty of the self-compacting concrete is improved by the conventional preparation method of the self-compacting concrete.
Disclosure of Invention
In view of the above situation, the invention provides a self-compacting concrete and a preparation method thereof, which can improve the fluidity and the workability of the concrete by adding an air entraining agent and stone powder into the concrete, so that the concrete meets the self-compacting requirement, thereby being suitable for the preparation of the self-compacting concrete under the condition of no concrete admixture such as fly ash, mineral powder, silica fume and the like, effectively reducing the construction cost and ensuring the construction quality.
In order to achieve the purpose, the technical scheme adopted by the invention is to provide the self-compacting concrete, and the composition proportion of the self-compacting concrete comprises 20.04-20.45 wt% of cement calculated by the total weight percentage of the self-compacting concrete; crushed stone, 45.14 to 45.54 wt%; medium sand, 26.11 to 26.52 wt%; water, 5.87 to 6.28 wt%; 0.43 to 0.47 wt% of air entraining and water reducing agent; and stone dust in an amount of 1.42 to 1.82 wt%; wherein the stone powder is selected from Qing mountain flour, shale stone powder or the composition thereof.
The invention also provides a preparation method of the self-compacting concrete, which comprises the following steps:
an admixture providing step: providing cement, broken stone, medium sand, water, an air-entraining water-reducing agent and stone powder produced in the site of a construction project;
the preparation method comprises the following steps: the self-compacting concrete is prepared by mixing and stirring 20.04 to 20.45 weight percent of cement, 45.14 to 45.54 weight percent of broken stone, 26.11 to 26.52 weight percent of medium sand, 5.87 to 6.28 weight percent of water, 0.43 to 0.47 weight percent of air-entraining water reducing agent and 1.42 to 1.82 weight percent of stone powder according to the total weight percent of the self-compacting concrete.
In the embodiment of the invention, the self-compacting concrete comprises the following components in percentage by weight: the self-compacting concrete comprises, by weight, 20.24% of cement, 45.34% of macadam, 26.31% of medium sand, 6.03% of water, 0.45% of air-entraining and water-reducing agents and 1.62% of stone powder.
Preferably, the composition ratio of the stone powder comprises 1.21 wt% of Qingshi powder and 0.41 wt% of shale powder, calculated by the total weight percentage of the self-compacting concrete.
Preferably, the stone powder is selected from Qingshan powder, shale powder or a combination thereof produced by Tibet.
Preferably, the concrete gas content of the self-compacting concrete is 3.5 to 4.5 percent.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
(1) the self-compacting concrete and the preparation method thereof have the advantages that the operation is easy and simple, the prepared concrete meets the requirements of the self-compacting concrete, the materials required by the concrete preparation are simple and easy to obtain, the problem that the working performance of the self-compacting concrete does not reach the standard due to the lack of admixtures such as fly ash, mineral powder and silica fume can be effectively solved, the self-compacting concrete is particularly suitable for preparing the self-compacting concrete in the areas similar to Qinghai, Tibet and the like where the fly ash, the mineral powder and the silica fume are not produced, and the self-compacting concrete and the preparation method thereof use local building materials, meet the requirements of green construction, and have better popularization value and larger.
(2) In the implementation process, the material cost and the transportation cost for purchasing concrete admixtures such as fly ash, mineral powder, silica fume and the like can be saved, the time risk in the transportation process is reduced, the occupancy rate of a storage tank of a mixing plant is reduced, the timeliness of concrete feeding in the construction process can be effectively ensured, and the construction period is shortened. Because the air-entraining water reducer and the stone powder are produced locally, and the materials are convenient and cheap to supply, the investment cost is low and the production is convenient in the whole implementation process, and the air-entraining water reducer and the stone powder have high input-output ratio and high value. .
These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description and appended claims, and may be realized by means of the instrumentalities, devices and combinations particularly pointed out in the appended claims.
Detailed Description
To facilitate an understanding of the present invention, the following description is given in conjunction with the examples.
The invention provides self-compacting concrete, which comprises 20.04-20.45 wt% of cement, 45.14-45.54 wt% of broken stone, 26.11-26.52 wt% of medium sand, 5.87-6.28 wt% of water, 0.43-0.47 wt% of air-entraining water reducing agent and 1.42-1.82 wt% of stone powder, wherein the self-compacting concrete comprises the following components in percentage by weight; wherein the stone powder is stone powder produced at the site of the construction project, and the stone powder is preferably selected from Qing stone powder, shale powder or the combination thereof. In the embodiment of the invention, the stone powder consists of Qingshan powder and shale powder produced by Tibet Lasa, and the stone powder comprises 1.01 to 1.42 wt% of Qingshan powder and 0.2 to 0.61 wt% of shale powder calculated by the total weight percentage of the self-compacting concrete.
Specifically, the composition ratio of the self-compacting concrete is preferably 20.24 wt% of cement, 45.34 wt% of macadam, 26.31 wt% of medium sand, 6.03 wt% of water, 0.45 wt% of air-entraining water-reducing agent and 1.62 wt% of stone powder, calculated by the total weight percentage of the self-compacting concrete; wherein the 1.62 wt% stone powder comprises 1.21 wt% of green stone powder and 0.41 wt% of shale powder.
The self-compacting concrete and the method for preparing the same according to the present invention are described above, and the following examples are made of the cordierite stone powder and the shale stone powder produced by Tibet at the construction sites.
The invention adds proper amount of air entraining agent and bluestone powder and shale powder produced by Tibet Lasa in the place of construction project when preparing self-compacting concrete, the concrete mixing ratio is shown in the following table 1(C50 self-compacting concrete).
[ Table 1]
Because the concrete added with the air entraining agent can generate a large amount of micro bubbles in the stirring process, the micro bubbles play a lubricating effect in the concrete, and the slump, the fluidity and the plasticity of the concrete are obviously improved; reduce bleeding and segregation of concrete, improve homogeneity of concrete, and greatly improve frost resistance, salt resistance, impermeability, sulfate corrosion resistance and alkali-aggregate reaction resistance of concrete. Thus, the blending ratios of the C50 self-compacting concrete in example 1 in which a common polycarboxylic acid water reducing agent was added and in example 2 in which an air-entraining water reducing agent was added were respectively determined, as shown in Table 2.
[ Table 2]
By testing the C50 self-compacting concrete in table 2 and testing the C50 self-compacting concrete added with the water reducing agent (example 1) or the air entraining agent (example 2), it can be seen that the concrete added with the air entraining agent (example 2) has improved slump, slump time and the like, and the specific data are as shown in table 3 below. As can be seen from Table 3, when the air content of the self-compacting concrete prepared by the method is about 4%, the slump expansion degree of the concrete can reach 710mm, and the slump completion time is controlled within 5s, so that the requirements of the self-compacting concrete are completely met.
[ Table 3]
The stone powder prepared from the self-compacting concrete is Qingshi powder and shale powder produced by Tibet Lasa, the fineness of the stone powder (80UM square hole sieve residue) is less than 25 percent, and the stability and other properties meet the requirements. The Qingshan powder and shale powder produced by Tibet Lassa are added into the concrete, so that the rheological property of the concrete can be adjusted, the plastic viscosity is improved, the slurry-solid ratio in a mixture is improved, the workability of the concrete is improved, the homogeneity of the concrete is improved, the friction force among coarse and fine aggregate particles is reduced, the resistance-passing capacity of the concrete is improved, and the dry shrinkage performance of the concrete can be improved. Thus, the mix ratios of the C50 self-compacting concrete of example 3 in which the green stone powder and the shale powder were added and example 4 in which the green stone powder and the shale powder were not added were determined, respectively, as shown in table 4.
[ Table 4]
By testing the C50 self-compacting concrete shown in table 4, and testing the C50 self-compacting concrete without adding the limestone powder and the shale powder (example 3) and with adding the limestone powder and the shale powder (example 4), it can be known that the concrete with adding the limestone powder and the shale powder has certain improvements in slump expansion, slump time, molding quality and the like, and the specific data are shown in table 5 below. As can be seen from Table 5, the workability and fluidity of the self-compacting concrete prepared by the present invention are significantly improved by adding stone powders (Qingshi powder and shale powder), and the working properties of the concrete completely meet the requirements of the self-compacting concrete.
[ Table 5]
In summary, the self-compacting concrete and the preparation method thereof provided by the invention can solve the problem of preparation of self-compacting concrete when mineral admixtures such as fly ash, mineral powder, silica fume, limestone powder and the like are not available in the Tibet region by using the Qingshan powder and the shale powder produced in the Tibet Lasa region as admixtures, and compared with the characteristics of various raw materials, complex mixture ratio and high cost of common self-compacting concrete, the self-compacting concrete prepared by the method has the characteristics of simple and easily obtained raw materials, simple preparation method, good working performance of concrete and the like, and the preparation method effectively improves the indexes such as frost resistance, durability and the like of the concrete; the self-compacting concrete prepared by the method can also save mineral admixtures such as fly ash, mineral powder, silica fume, limestone powder and the like, meet the requirement of green construction and effectively save the production cost of the concrete.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. The self-compacting concrete is characterized in that the self-compacting concrete comprises the following components in percentage by total weight:
20.04 to 20.45 wt% of cement;
crushed stone, 45.14 to 45.54 wt%;
medium sand, 26.11 to 26.52 wt%;
water, 5.87 to 6.28 wt%;
0.43 to 0.47 wt% of air entraining and water reducing agent; and
stone powder, 1.42 to 1.82 wt%;
wherein the stone powder is selected from Qing mountain flour, shale stone powder or the composition thereof.
2. The self-compacting concrete according to claim 1, wherein the self-compacting concrete comprises the following components in percentage by weight:
20.24 wt% of cement;
45.34 wt% of broken stones;
the content of the medium sand is 26.31 wt%;
6.03 wt% of water;
the air entraining water reducing agent accounts for 0.45 wt%; and
the weight percentage of the stone powder is 1.62 percent.
3. The self-compacting concrete according to claim 2, characterized in that:
calculated by the total weight percentage of the self-compacting concrete, the composition proportion of the stone powder comprises 1.21 wt% of the green stone powder and 0.41 wt% of the shale powder.
4. The self-compacting concrete according to any one of claims 1 to 3, characterized in that:
the stone powder is selected from Qing mountain flour, shale stone flour or the composition thereof produced by Tibet.
5. The self-compacting concrete according to any one of claims 1 to 3, characterized in that: the air content of the self-compacting concrete is 3.5-4.5% by volume percentage.
6. A method for preparing self-compacting concrete, comprising the steps of:
an admixture providing step: providing cement, broken stone, medium sand, water, an air-entraining water-reducing agent and stone powder produced in the site of a construction project;
the preparation method comprises the following steps: the self-compacting concrete is prepared by mixing and stirring 20.04 to 20.45 weight percent of cement, 45.14 to 45.54 weight percent of broken stone, 26.11 to 26.52 weight percent of medium sand, 5.87 to 6.28 weight percent of water, 0.43 to 0.47 weight percent of air-entraining water reducing agent and 1.42 to 1.82 weight percent of stone powder according to the total weight percent of the self-compacting concrete.
7. The method of formulating self-compacting concrete according to claim 6, wherein:
the self-compacting concrete comprises, by weight, 20.24% of cement, 45.34% of macadam, 26.31% of medium sand, 6.03% of water, 0.45% of air-entraining and water-reducing agents and 1.62% of stone powder.
8. The method of formulating self-compacting concrete according to claim 7, wherein:
calculated by the total weight percentage of the self-compacting concrete, the composition proportion of the stone powder comprises 1.21 wt% of the green stone powder and 0.41 wt% of the shale powder.
9. The method of formulating self-compacting concrete according to any one of claims 6 to 8, characterized in that:
the stone powder is selected from Qing mountain flour, shale stone flour or the composition thereof produced by Tibet.
10. The method of formulating self-compacting concrete according to any one of claims 6 to 8, characterized in that: the air content of the self-compacting concrete is 3.5-4.5% by volume percentage.
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| CN202011489867.XA CN112592129A (en) | 2020-12-17 | 2020-12-17 | Self-compacting concrete and preparation method thereof |
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| CN202011489867.XA CN112592129A (en) | 2020-12-17 | 2020-12-17 | Self-compacting concrete and preparation method thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105601206A (en) * | 2016-02-01 | 2016-05-25 | 中国十七冶集团有限公司 | Iron ore waste rock self-compaction concrete |
| CN106882942A (en) * | 2017-03-09 | 2017-06-23 | 厦门南国雪建材科技有限公司 | A kind of marble powder Medium and low intensity grade self-compacting concrete |
| CN109180045A (en) * | 2018-10-27 | 2019-01-11 | 扬州佳奕金属材料有限公司 | A kind of mineral admixture |
| CN109293317A (en) * | 2018-11-30 | 2019-02-01 | 武汉城开新兴建材有限责任公司 | A kind of high intensity self-compacting concrete and preparation method thereof |
| CN110342860A (en) * | 2019-05-30 | 2019-10-18 | 苏州嘉盛远大建筑工业有限公司 | A kind of Self-leveling self-compacting concrete and its processing method |
| CN111620624A (en) * | 2020-05-25 | 2020-09-04 | 中铁大桥局集团有限公司 | Self-compacting concrete and preparation method thereof |
-
2020
- 2020-12-17 CN CN202011489867.XA patent/CN112592129A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105601206A (en) * | 2016-02-01 | 2016-05-25 | 中国十七冶集团有限公司 | Iron ore waste rock self-compaction concrete |
| CN106882942A (en) * | 2017-03-09 | 2017-06-23 | 厦门南国雪建材科技有限公司 | A kind of marble powder Medium and low intensity grade self-compacting concrete |
| CN109180045A (en) * | 2018-10-27 | 2019-01-11 | 扬州佳奕金属材料有限公司 | A kind of mineral admixture |
| CN109293317A (en) * | 2018-11-30 | 2019-02-01 | 武汉城开新兴建材有限责任公司 | A kind of high intensity self-compacting concrete and preparation method thereof |
| CN110342860A (en) * | 2019-05-30 | 2019-10-18 | 苏州嘉盛远大建筑工业有限公司 | A kind of Self-leveling self-compacting concrete and its processing method |
| CN111620624A (en) * | 2020-05-25 | 2020-09-04 | 中铁大桥局集团有限公司 | Self-compacting concrete and preparation method thereof |
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Application publication date: 20210402 |