CN111792882A - Self-compacting concrete and preparation method thereof - Google Patents
Self-compacting concrete and preparation method thereof Download PDFInfo
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- CN111792882A CN111792882A CN202010587302.9A CN202010587302A CN111792882A CN 111792882 A CN111792882 A CN 111792882A CN 202010587302 A CN202010587302 A CN 202010587302A CN 111792882 A CN111792882 A CN 111792882A
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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
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/22—Glass ; Devitrified glass
-
- 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
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
-
- 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
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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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
Abstract
The invention discloses a self-compacting concrete and a preparation method thereof, wherein the preparation method comprises the following steps: 154 parts of cement 112-doped materials, 95-125 parts of modified mineral powder, 75-85 parts of coal ash, 800-1100 parts of crushed stone, 195-233 parts of coarse sand, 455-580 parts of fine sand, 110-150 parts of water and 8-12 parts of additives. The concrete of the invention has low fluidity, high strength, good operation, compactness and compressive strength, small pumping pressure and large pumping distance.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to self-compacting concrete and a preparation method thereof.
Background
At present, the requirements of limitation of thick and thin aggregates and low water-cement ratio are limited in the design of concrete mixing ratio, and a high-performance fluidized water reducing agent is matched to achieve the high compactness of concrete, so that the durability of the concrete and the protection of reinforcing steel bars are greatly improved and protected.
However, for general engineering, building construction and the like, the working performance of self-compacting concrete is not needed, and compared with common concrete used in general engineering, the self-compacting concrete has poor fluidity, low pumpability and low compactness and pressure resistance.
Disclosure of Invention
Based on the defects of the prior art, the invention provides self-compacting concrete.
In order to solve the above technical problems, the present invention provides a self-compacting concrete, comprising: 154 parts of cement 112-doped materials, 95-125 parts of modified mineral powder, 75-85 parts of coal ash, 800-1100 parts of crushed stone, 195-233 parts of coarse sand, 455-580 parts of fine sand, 110-150 parts of water and 8-12 parts of additives.
As an improvement of the technical scheme, the self-compacting concrete comprises: 136 parts of cement, 107 parts of modified mineral powder, 77 parts of coal ash, 927 parts of broken stone, 204 parts of coarse sand, 469 parts of fine sand, 122 parts of water and 11.4 parts of an additive.
As an improvement of the above technical solution, the method comprises the following steps: 128 parts of cement, 114 parts of modified mineral powder, 81 parts of coal ash, 886 parts of crushed stone, 214 parts of coarse sand, 504 parts of fine sand, 116 parts of water and 8.9 parts of an additive.
As an improvement of the technical scheme, the additive is composed of the following raw materials in parts by weight: 3-6 parts of a polycarboxylic acid water reducing agent, 2-3 parts of a binder, 1-2 parts of an expanding agent, 2-3 parts of nano graphite and 1-2 parts of polystyrene nano microspheres.
As an improvement of the technical scheme, the additive is composed of the following raw materials in parts by weight: 4.6 parts of polycarboxylic acid water reducing agent, 2.3 parts of binder, 1.7 parts of expanding agent, 2.4 parts of nano graphite and 1.4 parts of polystyrene nano microspheres.
As an improvement of the technical scheme, the modified mineral powder is prepared by placing slag in a kiln, adding silicon carbide, silicon dioxide, limestone, activated carbon and polydimethylsiloxane, heating to 700-735 ℃, introducing nitrogen under 7-8.6 Mpa, keeping the temperature and pressure for 3-6 h, naturally cooling to normal temperature, and crushing into powder.
As an improvement of the technical scheme, the slag is one or a mixture of more of magnesite slag, steel slag, high-alumina slag and glass slag.
Another object of the present invention is to provide a method for preparing self-compacting concrete, comprising the steps of:
step 1, uniformly stirring and mixing coal ash and 1/2 modified slag powder, adding coarse sand and broken stone, and mixing and stirring to form an aggregate mixture;
step 2, mixing and stirring the cement and the residual 1/2 modified slag powder uniformly to prepare a slurry mixture;
step 3, adding the slurry mixture prepared in the step 2 into the aggregate mixture prepared in the step 1, and uniformly stirring to prepare a mixture;
step 4, dissolving a polycarboxylic acid water reducing agent, a binder, an expanding agent, nano graphite and polystyrene nano microspheres in a copper nitrate solution, uniformly stirring, adding hydroxypropyl-BETA-cyclodextrin, heating to 40-46 ℃, and carrying out an oscillation reaction for 1.5 hours to prepare an additive;
and 5, adding the additive solution prepared in the step 4 into the mixture prepared in the step 3, and uniformly stirring to obtain the self-compacting concrete.
As an improvement of the technical scheme, the concentration of the copper nitrate solution is 0.975 g/L.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. the concrete of the invention has low fluidity, low water-cement ratio, high strength and good operation.
2. According to the invention, when the slag is modified, silicon carbide and activated carbon are used as precursors, and the slag is heated at high temperature to react with silicon dioxide and limestone, so that metal cations in the slag can be on a substrate using the limestone as a binder, and negative ions in the slag are adsorbed on the activated carbon, and the positive and negative ions in the raw materials are well dispersed, so that the modified slag powder has anisotropy, the fluidity of concrete is increased, and the compactness and compressive strength of the concrete are improved.
3. The concrete pump has small pumping pressure and large pumping distance.
Detailed Description
Other aspects, features and advantages of the present invention will become apparent from the following detailed description, which, when taken in conjunction with the drawings, illustrate by way of example the principles of the invention.
Preparing modified mineral powder:
the modified mineral powder is prepared by placing slag in a kiln, adding silicon carbide, silicon dioxide, limestone, activated carbon and polydimethylsiloxane, heating to 700-735 ℃, introducing nitrogen under 7-8.6 Mpa, keeping the temperature and pressure for 3-6 h, naturally cooling to normal temperature, and crushing into powder. Wherein the slag, the silicon carbide, the silicon dioxide, the limestone, the active carbon and the polydimethylsiloxane are in parts by weight as follows: 12:3:4:2.6:2.5:1.8. The slag is one or a mixture of more of magnesite slag, steel slag, high-alumina slag and glass slag.
The modified mineral powder used in example 1-2 was prepared by placing a combination of magnesite slag, steel slag, high-alumina slag, and glass slag in a kiln (the modified mineral powder in example 3-4 was prepared by placing a combination of magnesite slag and high-alumina slag in a kiln), selecting a sealed type for the kiln, adding silicon carbide, silica, limestone, activated carbon, and polydimethylsiloxane, heating to 725 ℃, introducing nitrogen gas under 7.5Mpa, maintaining the temperature and pressure for 4.2 hours, naturally cooling to room temperature, and crushing to powder.
The modified mineral powder used in example 3-4 was prepared by placing a mixture of magnesite slag and steel slag in a kiln, adding silicon carbide, silicon dioxide, limestone, activated carbon and polydimethylsiloxane, heating to 730 ℃, introducing nitrogen at 8.5Mpa, maintaining the temperature and pressure for 3.6 hours, naturally cooling to room temperature, and crushing to powder.
The additive used in the invention is further composed of the following raw materials in parts by weight: 3-6 parts of a polycarboxylic acid water reducing agent, 2-3 parts of a binder, 1-2 parts of an expanding agent, 2-3 parts of nano graphite and 1-2 parts of polystyrene nano microspheres.
Furthermore, the additive is prepared from the following raw materials in parts by weight: 3-6 parts of a polycarboxylic acid water reducing agent, 2-3 parts of a binder, 1-2 parts of an expanding agent, 2-3 parts of nano graphite and 1-2 parts of polystyrene nano microspheres, dissolving the materials in a copper nitrate solution with the concentration of 0.975g/L, uniformly stirring, adding hydroxypropyl-BETA-cyclodextrin, heating to 40-46 ℃, and carrying out an oscillation reaction for 1.5 hours to prepare the polycarboxylic acid water reducing agent; hydroxypropyl-BETA-cyclodextrin and copper nitrate promote decomposition of polystyrene nanometer microsphere and reaction with hydroxypropyl-BETA-cyclodextrin, hydroxypropyl-polymer maintains chiral cavity structure of additive main body, and due to introduction of hydrophilic group hydroxypropyl, physicochemical properties of structure, water solubility, etc. of nanometer graphite and polystyrene nanometer microsphere, and performances of selectivity, fluidity, combination stability, etc. of foreign molecules are greatly improved.
Example 1
Preparing the following raw material components: 136 parts of cement, 107 parts of modified mineral powder, 77 parts of coal ash, 927 parts of broken stone, 204 parts of coarse sand, 469 parts of fine sand, 122 parts of water and 11.4 parts of an additive. The additive comprises the following raw materials in parts by weight: 4.6 parts of polycarboxylic acid water reducing agent, 2.3 parts of binder, 1.7 parts of expanding agent, 2.4 parts of nano graphite and 1.4 parts of polystyrene nano microspheres.
The self-compacting concrete is prepared by the following steps:
step 1, uniformly stirring and mixing coal ash and 1/2 modified slag powder, adding coarse sand and broken stone, and mixing and stirring to form an aggregate mixture;
step 2, mixing and stirring the cement and the residual 1/2 modified slag powder uniformly to prepare a slurry mixture;
step 3, adding the slurry mixture prepared in the step 2 into the aggregate mixture prepared in the step 1, and uniformly stirring to prepare a mixture;
and 4, adding the additive solution into the mixture obtained in the step 3, and uniformly stirring to obtain the self-compacting concrete.
Example 2
Preparing the following raw materials in parts by weight: 128 parts of cement, 114 parts of modified mineral powder, 81 parts of coal ash, 886 parts of crushed stone, 214 parts of coarse sand, 504 parts of fine sand, 116 parts of water and 8.9 parts of an additive. The raw materials of the additive are preferably 4.6 parts of polycarboxylic acid water reducing agent, 2.3 parts of binder, 1.7 parts of expanding agent, 2.4 parts of nano graphite and 1.4 parts of polystyrene nano microspheres.
Self-compacting concrete was prepared as in example 1.
Example 3
Preparing the following raw materials in parts by weight: 112 parts of cement, 125 parts of modified mineral powder, 85 parts of coal ash, 800 parts of broken stone, 233 parts of coarse sand, 455 parts of fine sand, 110 parts of water and 8 parts of an additive.
Self-compacting concrete was prepared as in example 1.
Example 4
154 parts of cement, 95 parts of modified mineral powder, 75 parts of coal ash, 1100 parts of crushed stone, 195 parts of coarse sand, 580 parts of fine sand, 150 parts of water and 12 parts of an additive.
Self-compacting concrete was prepared as in example 1.
Performance testing of examples 1-4:
(1) the mechanical properties of the self-compacting concrete are carried out according to the existing national standard GB/T50081-2002 'test method for mechanical properties of common concrete', and the long-term properties and the durability of the self-compacting concrete are carried out according to the existing national standard GB/T50082-2009 'test method for long-term properties and durability of common concrete'.
(2) The experimental method for the slump expansion degree, the J-ring expansion degree, the expansion time and the segregation rate of the self-compacting concrete is carried out by referring to the current standard JGJ/T283-2012 'technical specification for the application of the self-compacting concrete'.
Experimental data As a result of examination by examination methods (1) and (2), Table 1 was obtained
The preparation methods of examples 1-4 and the data in table 1 show that the method is simple, complex equipment and process flow are not needed, the whole preparation process can be modified by only putting the slag into a device for sealing and heating, the cost is low, the synthesis time is short, and the yield is high. The data in table 1 show that the prepared concrete has good fluidity, because silicon carbide and activated carbon are used as precursors when slag is modified, and the slag is heated at high temperature to react with silicon dioxide and limestone, metal cations in the slag can form balls on a substrate using the limestone as a binder, and negative ions in the slag are adsorbed on the activated carbon, so that the positive and negative ions in the raw materials are well dispersed, the modified slag powder has anisotropy, and the fluidity of the concrete is improved. Meanwhile, the active carbon, the silicon carbide and the slag can form a micro aperture in the modification process, so that the active carbon, the silicon carbide and the slag can be favorably blended with other rubber materials and can eliminate bubbles, cement fine sand and the like can be favorably flowed in, and bleeding and segregation are not easy to occur, so that the compactness and the compressive strength of the concrete are improved. After the additive and water are further added in the process of preparing the concrete, metal cations on a substrate taking limestone as a binder and negative ions adsorbed on activated carbon in the stirred concrete are further fully dispersed along with stirring and then mutually attracted to form a stable combination, so that the compactness and the compressive strength of the concrete are further improved, and the problem of pipeline blockage caused by segregation is reduced during pumping. Furthermore, the nano graphite and the polystyrene nano microspheres are added into the admixture, and due to the introduction of hydrophilic group hydroxypropyl, the water capacity and the fluidity of the admixture are further enhanced, and the pumping resistance is reduced.
In the experiment, a wika pressure sensor with the model number of S-10990.36 is adopted to measure the pressure change in the pipeline, the pipeline is installed by punching, and the level of a pressure sensing interface and the inner wall of the pump pipe is ensured. 4 in-pipe pressure monitoring points are set in the experiment, the first detection point P1 is a position of 150 meters from the pump, the second detection point P2 is 280m away from the pump truck, and two 90-degree elbows and a 20m horizontal pipe are arranged at a distance P1 and used for detecting the pressure loss of a local bent pipe; the third detection points P3 and P2 have 4 horizontal pipes with the length of 120 meters and the distance between P1 and P2, and are used for detecting the pressure loss of the straight pipes; the 4 th detection points P4 and P2 have the distance of 380 meters between 11 horizontal pipes P1 and P2, and the pressure loss of the straight pipe is detected. Obtain Table 2
And (3) continuously carrying out observation and test from the pressure of 0, wherein after the pressure is increased to 11.8Mpa, 4 pipelines form laminar flow, and the pressure tends to be stable, which shows that the pumping pressure of the invention is low and the pumping distance is long.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (9)
1. A self-compacting concrete, comprising: 154 parts of cement 112-doped materials, 95-125 parts of modified mineral powder, 75-85 parts of coal ash, 800-1100 parts of crushed stone, 195-233 parts of coarse sand, 455-580 parts of fine sand, 110-150 parts of water and 8-12 parts of additives.
2. A self-compacting concrete according to claim 1, characterized in that it comprises: 136 parts of cement, 107 parts of modified mineral powder, 77 parts of coal ash, 927 parts of broken stone, 204 parts of coarse sand, 469 parts of fine sand, 122 parts of water and 11.4 parts of an additive.
3. A semi-self-compacting concrete according to claim 1, comprising: 128 parts of cement, 114 parts of modified mineral powder, 81 parts of coal ash, 886 parts of crushed stone, 214 parts of coarse sand, 504 parts of fine sand, 116 parts of water and 8.9 parts of an additive.
4. A self-compacting concrete according to any one of claims 1-3, characterized in that: the additive is composed of the following raw materials in parts by weight: 3-6 parts of a polycarboxylic acid water reducing agent, 2-3 parts of a binder, 1-2 parts of an expanding agent, 2-3 parts of nano graphite and 1-2 parts of polystyrene nano microspheres.
5. A self-compacting concrete according to any one of claims 1-3, characterized in that: the additive is composed of the following raw materials in parts by weight: 4.6 parts of polycarboxylic acid water reducing agent, 2.3 parts of binder, 1.7 parts of expanding agent, 2.4 parts of nano graphite and 1.4 parts of polystyrene nano microspheres.
6. A self-compacting concrete according to any one of claims 1-3, characterized in that: the modified mineral powder is prepared by placing slag in a kiln, adding silicon carbide, silicon dioxide, limestone, activated carbon and polydimethylsiloxane, heating to 700-735 ℃, introducing nitrogen under 7-8.6 Mpa, keeping the temperature and pressure for 3-6 h, naturally cooling to normal temperature, and crushing into powder.
7. The self-compacting concrete of claim 6, wherein: the slag is one or a mixture of more of magnesite slag, steel slag, high-aluminum slag and glass slag.
8. A method for preparing a self-compacting concrete according to any one of claims 1-3, characterized in that it comprises the following steps:
step 1, uniformly stirring and mixing coal ash and 1/2 modified slag powder, adding coarse sand and broken stone, and mixing and stirring to form an aggregate mixture;
step 2, mixing and stirring the cement and the residual 1/2 modified slag powder uniformly to prepare a slurry mixture;
step 3, adding the slurry mixture prepared in the step 2 into the aggregate mixture prepared in the step 1, and uniformly stirring to prepare a mixture;
step 4, dissolving a polycarboxylic acid water reducing agent, a binder, an expanding agent, nano graphite and polystyrene nano microspheres in a copper nitrate solution, uniformly stirring, adding hydroxypropyl-BETA-cyclodextrin, heating to 40-46 ℃, and carrying out an oscillation reaction for 1.5 hours to prepare an additive;
and 5, adding the additive solution prepared in the step 4 into the mixture prepared in the step 3, and uniformly stirring to obtain the self-compacting concrete.
9. The method of claim 8, wherein the copper nitrate solution has a concentration of 0.975 g/L.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114671642A (en) * | 2020-11-30 | 2022-06-28 | 兰刚 | Waterproof impervious concrete with self-repairing function |
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| US20150314266A1 (en) * | 2012-12-07 | 2015-11-05 | Osaka University | Adsorbent for organic fluoro-compound comprising cyclodextrin-supported polymer |
| CN106904892A (en) * | 2017-03-28 | 2017-06-30 | 南宁市嘉大混凝土有限公司 | Half self-compacting concrete |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5919300A (en) * | 1996-10-27 | 1999-07-06 | Sika Ag. Vorm. Kaspar Winkler & Co. | Dispersing agent for high-flow or self-compacting concrete |
| US20150314266A1 (en) * | 2012-12-07 | 2015-11-05 | Osaka University | Adsorbent for organic fluoro-compound comprising cyclodextrin-supported polymer |
| CN106904892A (en) * | 2017-03-28 | 2017-06-30 | 南宁市嘉大混凝土有限公司 | Half self-compacting concrete |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114671642A (en) * | 2020-11-30 | 2022-06-28 | 兰刚 | Waterproof impervious concrete with self-repairing function |
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Application publication date: 20201020 |