CN112939535B - Premixed steam-curing-free ultrahigh-performance concrete - Google Patents
Premixed steam-curing-free ultrahigh-performance concrete Download PDFInfo
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/61—Corrosion inhibitors
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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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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- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to the technical field of concrete, and particularly discloses ready-mixed steam-curing-free ultra-high performance concrete. The premixed steam-curing-free ultrahigh-performance concrete is mainly prepared from the following raw materials in parts by weight: 1100 parts of cement 900-; the lightweight aggregate comprises at least one of silica fume, fly ash, quartz powder and shale ceramsite, and the tackifier comprises aliphatic amine. The ready-mixed steam-curing-free ultrahigh-performance concrete can be used for building construction and has the advantages of being free of steam curing and excellent in mechanical property.
Description
Technical Field
The application relates to the technical field of concrete, in particular to ready-mixed steam-curing-free ultrahigh-performance concrete.
Background
With the continuous development of the building industry, the ultra-high performance concrete as a novel high performance cement-based composite material is widely applied to the construction of bridges, roads and special buildings, and has the characteristics of high durability, excellent mechanical properties and the like. However, in the preparation process of the ultra-high performance concrete, the raw material proportion, the preparation process and the like are limited to a certain extent, for example, conditions such as high temperature, hot press molding, steam curing and the like are required, and the molding process is complex, so that the preparation of the ultra-high performance concrete with good performance has certain difficulty and great construction limitation.
In order to solve the problems, the Chinese patent with application publication number CN107021678A discloses a formula of light high-performance non-autoclaved concrete and a preparation method of an electric pole, wherein the formula comprises a cementing material, ultra-light density ceramsite, fine aggregate and a polycarboxylic acid water reducing agent; the cementing material consists of mineral powder, fly ash, wollastonite powder and cement; in each cubic concrete, 100-200kg/m3 of cement, 150-200kg/m3 of mineral powder, 120-150kg/m3 of fly ash, 20-30kg/m3 of silica ash, 640-700kg/m3 of fine aggregate, 190-3 of ultra-light density ceramsite, 9-15kg/m3 of polycarboxylic acid water reducing agent and 160-160 kg/m3 of mixing water; the density of the ultra-light density ceramsite is preferably 345-360kg/m 3; the particle size of the ultra-light density ceramsite is preferably 0.5-2.5cm, and the weight of each cubic concrete is controlled within 1500kg/m 3.
Aiming at the light high-performance steam-curing-free concrete, the inventor thinks that the particle size of the ultra-light density ceramsite is larger, and the capillary tensile stress formed between the ceramsite and the surrounding gel material is larger in the drying process of the concrete, so that cracks are easy to generate in the curing process of the concrete, and the mechanical property of the concrete is poor.
Disclosure of Invention
In order to improve the mechanical property of concrete, the application provides premixed steam-curing-free ultra-high performance concrete.
The application provides a ready-mixed steam-curing-free ultra-high performance concrete, which adopts the following technical scheme:
the premixed steam-curing-free ultrahigh-performance concrete is mainly prepared from the following raw materials in parts by weight: 1100 parts of cement 900-; the lightweight aggregate comprises at least one of silica fume, fly ash, quartz powder and shale ceramsite, and the tackifier comprises aliphatic amine.
By adopting the technical scheme, the light aggregate is adopted to replace coarse aggregate with larger particle size in the premixed steam-curing-free ultra-high performance concrete, the tensile stress generated by capillary pores in the concrete in the drying process is weakened, and small-size particles such as silica fume, fly ash, quartz powder, shale ceramsite and the like are adopted, so that the concrete can reach the optimal stacking compactness state, a small porosity and a reasonably-distributed pore structure can be formed, the concrete can obtain high strength without high-pressure steam curing, in addition, the aliphatic amine of the tackifier can improve the rheological property of the concrete, the rigidity and toughness of the concrete in the curing and drying processes are improved, and the mechanical property of the concrete is further improved.
Preferably, the feed is mainly prepared from the following raw materials in parts by weight: 1050 parts of cement 950-; the lightweight aggregate comprises at least one of silica fume, fly ash, quartz powder and shale ceramsite, and the tackifier comprises aliphatic amine.
By adopting the technical scheme, the proportion of the raw materials is further optimized, so that the rheological property and the strength of the obtained concrete are better, the generation of micro defects in the concrete is reduced, and the mechanical property of the concrete is further improved.
Preferably, the lightweight aggregate also comprises a layered mineral composite material, and the lightweight aggregate is composed of (3-4) by mass, (2.5-3.5) by mass, (2.5-3) by mass, (0.25-0.35) by mass and (0.15-0.25) by mass.
By adopting the technical scheme, the fly ash, the quartz component, the shale ceramsite and the layered mineral composite material are mixed according to the proportion, particles with different particle sizes are mutually filled and supported to form the gelled material with better stacking compactness, the gelled particles with small particle sizes play a role in lubricating and viscosity reducing, and micro-gaps are not easy to generate in the curing and drying process of concrete, so that the cracking probability of the concrete is reduced, and the mechanical property of the concrete is improved.
Preferably, the layered mineral composite material is a nano layered mineral composite material, and the nano layered mineral composite material is at least one of nano layered kaolin, nano layered montmorillonite and nano layered nano mica.
By adopting the technical scheme, the nano-layered kaolin, the nano-layered montmorillonite and the nano-layered nano mica have a two-dimensional nano sheet structure, are good in dispersibility and adsorptivity, can form Van der Waals force with the cementing material and water molecules in capillary gaps after being uniformly dispersed in concrete, reduce negative pressure tensile stress during drying and migration of liquid level in the capillary holes, enable water in the concrete to be slowly diffused to the surface of the concrete from the interior of the concrete, reduce the shrinkage rate of the concrete, improve the strength and stability of the concrete, and in addition, the nano-layered composite material can play a role in curing chloride ions, reduce the diffusion coefficient of the chloride ions in the concrete and improve the corrosion resistance of the concrete in a high-salt environment.
Preferably, the nano layered mineral composite material consists of nano layered kaolin, nano layered montmorillonite and nano layered mica according to the mass ratio of (5-10) to (1-3) to (1.5-2).
By adopting the technical scheme, the nano-layered kaolin, the nano-layered montmorillonite and the nano-layered mica have better compounding effect, better rigidity, strength and aspect ratio and better combination degree with the cementing material according to the proportion.
Preferably, the tackifier also comprises polyacrylamide, and the mass ratio of the polyacrylamide to the aliphatic amine is (0.15-0.3) to (1-3).
By adopting the technical scheme, the polyacrylamide and the aliphatic amine are dispersed in the concrete and can be associated with water molecules to form a hydration film, so that free water in the cementing material is increased, the dispersibility of the cementing material is improved, aggregate particles and the cementing material of the concrete are not easy to flocculate, the microstructure of the concrete is improved, and the micromechanical property of the concrete is improved.
Preferably, the average particle size of the silica fume is 10-20 nm.
By adopting the technical scheme, the silica fume with the average particle size has higher activity, can fully consume calcium hydroxide generated in the cement hydration process, and can be used as micro particles to fully fill gaps formed among raw material particles of concrete, reduce the generation of cavities in the concrete, reduce the number of stress defect points in the concrete and improve the mechanical property of the concrete.
Preferably, the raw material further comprises 1-3 parts by weight of a complexing agent, and the complexing agent is at least one of quaternary ammonium salt and hydroxyquinoline.
By adopting the technical scheme, the nitrogen positive ions in the quaternary ammonium salt and the hydroxyquinoline can capture and complex chloride ions permeating into concrete, and the long carbon chains of the quaternary ammonium salt and the hydroxyquinoline have great space resistance, so that the migration of the chloride ions in the concrete can be reduced, the corrosion damage effect of the chloride ions on the concrete is reduced, the service life of the concrete is prolonged, and the corrosion resistance of the concrete is improved.
Preferably, the complexing agent is prepared from quaternary ammonium salt and hydroxyquinoline according to the mass ratio of (1-2) to (0.2-0.5).
By adopting the technical scheme, the quaternary ammonium salt and the hydroxyquinoline compounded according to the proportion have better complexing effect on chloride ions and can play a better anchoring role on the chloride ions.
Preferably, the raw materials also comprise 0.5-2 parts by weight of preservative, the preservative comprises sodium fluoride and acrylic resin, and the mass ratio of the sodium fluoride to the acrylic resin is (1-3) to (1-2).
By adopting the technical scheme, after the sodium fluoride and the acrylic resin are doped into the concrete, the corrosion of chloride and sulfate can be resisted, the pore structure and the compactness of the concrete are improved, the permeability of chloride ions is reduced, and the hardness of the concrete is improved to a certain extent.
In summary, the present application has the following beneficial effects:
1. because the light aggregate is adopted to replace the coarse aggregate, the silica fume, the fly ash, the quartz powder, the shale ceramisite and the cement can form a cementing material with better stacking compactness, and the viscosity of the cementing material is reduced under the curing and plasticizing actions of the aliphatic amine, so that the rigidity and the toughness of the concrete are improved, and the concrete has better mechanical properties;
2. according to the lightweight aggregate, the layered mineral composite material is added, so that the cracking resistance of concrete in the curing and drying processes is improved, the compactness and the microstructure stability of the concrete are improved, and the mechanical property of the concrete is further improved;
3. the raw materials of the concrete corrosion inhibitor are added with complexing agents and preservatives, so that the corrosion resistance of the concrete is improved, and the service life of the concrete is prolonged.
Detailed Description
The present application will be described in further detail with reference to examples.
The premixed steam-curing-free ultrahigh-performance concrete is mainly prepared from the following raw materials in parts by weight: 1100 parts of cement 900-; the lightweight aggregate comprises at least one of silica fume, fly ash, quartz powder and shale ceramsite, and the tackifier comprises aliphatic amine.
Preferably, the ready-mixed steam-curing-free ultrahigh-performance concrete is mainly prepared from the following raw materials in parts by weight: 1050 parts of cement 950-; the lightweight aggregate comprises at least one of silica fume, fly ash, quartz powder and shale ceramsite, and the tackifier comprises aliphatic amine.
Preferably, the cement is a pii 52.5 portland cement having a calcium oxide content of 58.35%, a silica content of 22.66%, an alumina content of 6.89%, and an iron oxide content of 5.28%.
Preferably, the lightweight aggregate comprises silica fume, fly ash, quartz powder and shale ceramsite, and the mass ratio of the silica fume, the fly ash, the quartz powder and the shale ceramsite is (3-4): (2.5-3.5): (2.5-3): 0.25-0.35).
Preferably, the silica fume has an average particle size of 10 to 20 nm. More preferably, the silica content of the silica fume is 93% to 96% on average. More preferably, the silica content of the silica fume is 95% on average. More preferably, the silica fume has an average particle size of 15 nm.
Preferably, the fly ash is first-grade fly ash, the average content of silicon dioxide in the fly ash is 45-48%, the average content of aluminum oxide is 37-39%, and the average content of ferric oxide is 5-8%. Further preferably, the fly ash has an average silica content of 46.5%, an average alumina content of 38%, and an average iron oxide content of 6%.
Preferably, the quartz powder has an average particle diameter of 50 to 65 μm. More preferably, the quartz powder has an average particle size of 55 μm.
Preferably, the shale ceramisite is ground, the grinding treatment is to grind the shale ceramisite in a grinder in batches, and the continuous grading of the average particle size of the ground shale ceramisite is 0.2-3 mm.
Further preferably, the lightweight aggregate further comprises a layered mineral composite. More preferably, the lightweight aggregate comprises (3-4) of silica fume, 2.5-3.5 of fly ash, 2.5-3 of quartz, 0.25-0.35 of shale ceramsite and 0.15-0.25 of layered mineral composite material according to the mass ratio.
Further preferably, the layered mineral composite material is a nano layered mineral composite material, and the nano layered mineral composite material is one or a compound of nano layered kaolin, nano layered montmorillonite and nano layered mica. Further preferably, the nano-layered mineral composite material consists of nano-layered kaolin, nano-layered montmorillonite and nano-layered mica according to the mass ratio of (5-10) to (1-3) to (1.5-2). Further preferably, the nano-layered mineral composite material consists of nano-layered kaolin, nano-layered montmorillonite and nano-layered mica according to the mass ratio of 7.5:2: 1.8. Further preferably, the nano-layered mineral composite has an average thickness of 30 to 50nm and an average length of 200 to 500 nm.
Preferably, the adhesion promoter comprises an aliphatic amine. More preferably, the aliphatic amine is at least one of 2-methylpentanediamine and 1, 2-cyclohexanediamine. Further preferably, the aliphatic amine is composed of 2-methylpentanediamine and 1, 2-cyclohexanediamine in a mass ratio of (2-5) to (1.5-3). More preferably, the aliphatic amine consists of 2-methylpentamethylenediamine and 1, 2-cyclohexanediamine in a mass ratio of 4.5: 2.
Further preferably, the tackifier also comprises polyacrylamide, and the mass ratio of the polyacrylamide to the aliphatic amine is (0.15-0.3) to (1-3). Further preferably, the mass ratio of polyacrylamide to aliphatic amine is 0.2: 1.5.
Further preferably, the tackifier also comprises silicon dioxide, and the mass ratio of the silicon dioxide to the aliphatic amine is (0.5-1.5): 1-2. Further preferably, the mass ratio of silica to aliphatic amine is 1: 1.5. More preferably, the silica is aqueous fumed silica having an average particle diameter of 5 to 15 μm. More preferably, the average particle size of the aqueous fumed silica is 10 μm.
Preferably, the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, and the manufacturer is Shandong Laya chemical Co.
Preferably, the raw material also comprises 1-3 parts by weight of complexing agent, and the complexing agent is at least one of quaternary ammonium salt and hydroxyquinoline. Further preferably, the complexing agent is composed of quaternary ammonium salt and hydroxyquinoline according to the mass ratio of (1-2) to (0.2-0.5). Further preferably, the complexing agent is composed of quaternary ammonium salt and hydroxyquinoline according to the mass ratio of 1.5: 0.35. More preferably, the quaternary ammonium salt is tetrabutylammonium bromide.
Preferably, the raw materials also comprise 0.5-2 parts by weight of preservative, the preservative consists of sodium fluoride and acrylic resin, and the mass ratio of the sodium fluoride to the acrylic resin is (1-3) to (0.5-1). Further preferably, the mass ratio of the sodium fluoride to the acrylic resin is 2: 0.65. Further preferably, the acrylic resin is water-based acrylic resin, the manufacturer is Jinan Jingchuan chemical industry Co., Ltd, and the solid content is 40%.
The application provides a preparation method of ready-mixed steam-curing-free ultrahigh-performance concrete, which comprises the following steps:
1) uniformly mixing cement and lightweight aggregate to prepare a mixture A;
2) uniformly mixing part of water, a water reducing agent and a tackifier to prepare a mixture B;
3) uniformly mixing the mixture B in the step 2) with the mixture A in the step 1), and then adding the rest water to uniformly mix to obtain the water-based paint.
Preferably, the step 1) of uniformly mixing the cement and the lightweight aggregate to prepare the mixture A is to stir the cement and the lightweight aggregate at the rotating speed of 90-120rpm for 1-3 min. More preferably, the cement and the lightweight aggregate are stirred at a rotation speed of 100rpm for 2 min.
Preferably, the step 2) of uniformly mixing part of the water, the water reducing agent and the tackifier to obtain the mixture B is to stir the part of the water, the water reducing agent and the tackifier at the rotating speed of 300-600rpm for 3-6 min. More preferably, the water reducing agent, the tackifier and the part of water are stirred for 5min at the rotating speed of 500 rpm.
Preferably, the step 3) of uniformly mixing the mixture B in the step 2) with the mixture A in the step 1) is to stir the mixture B in the step 2) and the mixture A in the step 1) at a rotating speed of 80-100rpm for 30S, and then to add the rest water and stir for 1-3 min. Further preferably, the mixture B in the step 2) and the mixture A in the step 1) are stirred for 30S at the rotating speed of 90rpm, and then the rest water is added to stir for 2 min.
The examples of the present application and comparative raw material information are shown in table 1.
TABLE 1 information on main raw materials of examples and comparative examples of the present application
| Starting materials | Specification of | Source manufacturer |
| Cement | Pⅱ52.5 | Henan Tugu building engineering Co Ltd |
| Silica fume | Tuoman Tuomalin mineral products Co Ltd | |
| Fly ash | Shijiazhuang Lin mineral products Co Ltd | |
| Shale ceramsite | Anhui-Huo Haydite products Ltd | |
| Quartz sand | Lingshou county Jiayuan mineral processing plant | |
| Nano-layered kaolin | Lingshou county Jiayuan mineral processing plant | |
| Nano layered montmorillonite | ZHEJIANG FENGHONG NEW MATERIAL Co.,Ltd. | |
| Nano laminated mica | Lingshou county Jiayuan mineral processing plant | |
| 2-methylpentanediamine | Chemical purity | Effersha |
| 1, 2-cyclohexanediamine | Chemical purity | Effersha |
| Polyacrylamide | Zhejiang Xinjian Environmental Protection Technology Co., Ltd. | |
| Silicon dioxide | HL-150 | Jingyi New Material Co Ltd, Guangzhou City |
| Tetrabutylammonium bromide | Chemical purity | Tianjin Fu Chen |
| Hydroxyquinolines | Chemical purity | Tianjin Fu Chen |
| Sodium fluoride | Chemical purity | Tianjin Fu Chen |
| Acrylic resin | Industrial purity | Jinan Hui Jingchuan chemical Co Ltd |
Examples
Example 1
The ready-mixed steam-curing-free ultrahigh-performance concrete is prepared from the following raw materials in parts by weight: 900kg of cement, 1145kg of lightweight aggregate, 430kg of water, 15kg of tackifier and 20kg of water reducing agent.
The lightweight aggregate is composed of silica fume, fly ash, quartz powder and shale ceramsite according to the mass ratio of 3:2.5:2.5:0.25, the average particle size of the silica fume is 15nm, the fly ash is first-grade fly ash, the average particle size of the quartz powder is 55 microns, the continuous grading of the average particle size of the shale ceramsite is 0.2-3mm, the tackifier is aliphatic amine, and the aliphatic amine is composed of 2-methylpentamethylenediamine and 1, 2-cyclohexanediamine according to the mass ratio of 4.5: 2.
The preparation method of the ready-mixed steam-curing-free ultrahigh-performance concrete comprises the following steps:
1) stirring cement and lightweight aggregate at the rotating speed of 100rpm for 2 min;
2) stirring part of water, the water reducing agent and the tackifier at the rotating speed of 500rpm for 5 min;
3) stirring the mixture B in the step 2) and the mixture A in the step 1) for 30 seconds at a rotating speed of 90rpm, and then adding the rest water and stirring for 2 min.
Example 2
The ready-mixed steam-curing-free ultrahigh-performance concrete is prepared from the following raw materials in parts by weight: 950kg of cement, 1200kg of lightweight aggregate, 460kg of water, 20kg of tackifier and 22kg of water reducing agent.
The lightweight aggregate is composed of silica fume, fly ash, quartz powder and shale ceramsite according to the mass ratio of 3.3:3:2.65:0.3, the average particle size of the silica fume is 15nm, the fly ash is first-grade fly ash, the average particle size of the quartz powder is 55 microns, the continuous grading of the average particle size of the shale ceramsite is 0.2-3mm, the tackifier is aliphatic amine, and the aliphatic amine is composed of 2-methylpentamethylenediamine and 1, 2-cyclohexanediamine according to the mass ratio of 4.5: 2.
The preparation method of the ready-mixed steam-curing-free ultrahigh-performance concrete comprises the following steps:
1) stirring cement and lightweight aggregate at the rotating speed of 100rpm for 2 min;
2) stirring part of water, the water reducing agent and the tackifier at the rotating speed of 500rpm for 5 min;
3) and (3) stirring the mixture B in the step 2) and the mixture A in the step 1) for 30 seconds at a rotating speed of 90rpm, and then adding the residual water and stirring for 2 min.
Example 3
The ready-mixed steam-curing-free ultrahigh-performance concrete is prepared from the following raw materials in parts by weight: 1000kg of cement, 1300kg of lightweight aggregate, 480kg of water, 23kg of tackifier and 23kg of water reducing agent.
The lightweight aggregate is composed of silica fume, fly ash, quartz powder and shale ceramsite according to the mass ratio of 3.5:3:2.7:0.32, the average particle size of the silica fume is 15nm, the fly ash is first-grade fly ash, the average particle size of the quartz powder is 55 microns, the continuous grading of the average particle size of the shale ceramsite is 0.2-3mm, the tackifier is aliphatic amine, and the aliphatic amine is composed of 2-methylpentamethylenediamine and 1, 2-cyclohexanediamine according to the mass ratio of 4.5: 2.
The preparation method of the ready-mixed steam-curing-free ultrahigh-performance concrete comprises the following steps:
1) stirring cement and lightweight aggregate at the rotating speed of 100rpm for 2 min;
2) stirring part of water, the water reducing agent and the tackifier at the rotating speed of 500rpm for 5 min;
3) stirring the mixture B in the step 2) and the mixture A in the step 1) for 30 seconds at a rotating speed of 90rpm, and then adding the rest water and stirring for 2 min.
Example 4
The ready-mixed steam-curing-free ultrahigh-performance concrete is prepared from the following raw materials in parts by weight: 1050kg of cement, 1400kg of lightweight aggregate, 500kg of water, 25kg of tackifier and 25kg of water reducing agent.
The lightweight aggregate is composed of silica fume, fly ash, quartz powder and shale ceramsite according to the mass ratio of 4:3.5:3:0.35, the average particle size of the silica fume is 15nm, the fly ash is first-grade fly ash, the average particle size of the quartz powder is 55 microns, the continuous gradation of the average particle size of the shale ceramsite is 0.2-3mm, the tackifier is aliphatic amine, and the aliphatic amine is composed of 2-methylpentamethylenediamine and 1, 2-cyclohexanediamine according to the mass ratio of 4.5: 2.
The preparation method of the ready-mixed steam-curing-free ultrahigh-performance concrete comprises the following steps:
1) stirring cement and lightweight aggregate at the rotating speed of 100rpm for 2 min;
2) stirring part of water, the water reducing agent and the tackifier at the rotating speed of 500rpm for 5 min;
3) stirring the mixture B in the step 2) and the mixture A in the step 1) for 30 seconds at a rotating speed of 90rpm, and then adding the rest water and stirring for 2 min.
Example 5
The present embodiment is different from embodiment 3 in that: the lightweight aggregate also comprises a layered mineral composite material, and the lightweight aggregate is composed of silica fume, fly ash, quartz, shale ceramsite and the layered mineral composite material according to the mass ratio of 3.5:3:2.7:0.32:0.15, and the rest is the same as that in the embodiment 3.
Wherein the nano layered mineral composite material consists of nano layered kaolin, nano layered montmorillonite and nano layered mica according to the mass ratio of 7.5:2: 1.8.
The preparation method of the ready-mixed steam-curing-free ultra-high performance concrete of the embodiment is the same as that of the embodiment 1.
Example 6
The present embodiment is different from embodiment 3 in that: the lightweight aggregate also comprises a layered mineral composite material, and the lightweight aggregate consists of silica fume, fly ash, quartz, shale ceramsite and the layered mineral composite material according to the mass ratio of 3.5:3:2.7:0.32:0.2, and the rest is the same as that in the embodiment 3.
Wherein the nano layered mineral composite material consists of nano layered kaolin, nano layered montmorillonite and nano layered mica according to the mass ratio of 7.5:2: 1.8.
The preparation method of the ready-mixed steam-curing-free ultra-high performance concrete of the embodiment is the same as that of the embodiment 1.
Example 7
The present embodiment is different from embodiment 3 in that: the lightweight aggregate also comprises a layered mineral composite material, and the lightweight aggregate consists of silica fume, fly ash, quartz, shale ceramsite and the layered mineral composite material according to the mass ratio of 3.5:3:2.7:0.32:0.25, and the rest is the same as that in the embodiment 3.
Wherein the nano layered mineral composite material consists of nano layered kaolin, nano layered montmorillonite and nano layered mica according to the mass ratio of 7.5:2: 1.8.
The preparation method of the ready-mixed steam-curing-free ultra-high performance concrete of the embodiment is the same as that of the embodiment 1.
Example 8
This embodiment is different from embodiment 6 in that: the tackifier also comprises polyacrylamide, and the mass ratio of the polyacrylamide to the aliphatic amine is 0.2: 1.5. The rest is the same as in example 6.
The preparation method of the ready-mixed steam-curing-free ultra-high performance concrete of the embodiment is the same as that of the embodiment 1.
Example 9
The present embodiment is different from embodiment 8 in that: the tackifier also comprises silicon dioxide, and the tackifier consists of aliphatic amine, polyacrylamide and silicon dioxide according to the mass ratio of 1.5:0.2: 1. The rest is the same as in example 6.
Wherein the silica is aqueous fumed silica, and the average particle diameter of the aqueous fumed silica is 10 μm.
The preparation method of the ready-mixed steam-curing-free ultra-high performance concrete of the embodiment is the same as that of the embodiment 1.
Example 10
The present embodiment is different from embodiment 9 in that: the raw materials also comprise 1kg of complexing agent, and the complexing agent consists of quaternary ammonium salt and hydroxyquinoline according to the mass ratio of 1.5: 0.35. The rest is the same as in example 9.
Wherein the quaternary ammonium salt is tetrabutylammonium bromide.
The preparation method of the ready-mixed steam-curing-free ultrahigh-performance concrete comprises the following steps:
1) stirring cement and lightweight aggregate at the rotating speed of 100rpm for 2 min;
2) stirring part of water, a water reducing agent, a tackifier and a complexing agent for 5min at the rotating speed of 500 rpm;
3) stirring the mixture B in the step 2) and the mixture A in the step 1) for 30 seconds at a rotating speed of 90rpm, and then adding the rest water and stirring for 2 min.
Example 11
The present embodiment is different from embodiment 9 in that: the raw materials also comprise 2kg of complexing agent, and the complexing agent consists of quaternary ammonium salt and hydroxyquinoline according to the mass ratio of 1.5: 0.35. The rest is the same as in example 9.
Wherein the quaternary ammonium salt is tetrabutylammonium bromide.
The preparation method of the ready-mixed steam-curing-free ultrahigh-performance concrete comprises the following steps:
1) stirring cement and lightweight aggregate at the rotating speed of 100rpm for 2 min;
2) stirring part of water, a water reducing agent, a tackifier and a complexing agent for 5min at the rotating speed of 500 rpm;
3) and (3) stirring the mixture B in the step 2) and the mixture A in the step 1) for 30 seconds at a rotating speed of 90rpm, and then adding the residual water and stirring for 2 min.
Example 12
The present embodiment is different from embodiment 9 in that: the raw materials also comprise 3kg of complexing agent, and the complexing agent consists of quaternary ammonium salt and hydroxyquinoline according to the mass ratio of 1.5: 0.35. The rest is the same as in example 9.
Wherein the quaternary ammonium salt is tetrabutylammonium bromide.
The preparation method of the ready-mixed steam-curing-free ultrahigh-performance concrete comprises the following steps:
1) stirring cement and lightweight aggregate at the rotating speed of 100rpm for 2 min;
2) stirring part of water, a water reducing agent, a tackifier and a complexing agent for 5min at the rotating speed of 500 rpm;
3) stirring the mixture B in the step 2) and the mixture A in the step 1) for 30 seconds at a rotating speed of 90rpm, and then adding the rest water and stirring for 2 min.
Example 13
This embodiment is different from embodiment 11 in that: the raw materials also comprise 0.5kg of preservative which is composed of sodium fluoride and acrylic resin according to the mass ratio of 2: 0.65. The rest is the same as in example 11.
Wherein the acrylic resin is water-based acrylic resin.
The preparation method of the ready-mixed steam-curing-free ultrahigh-performance concrete comprises the following steps:
1) stirring cement and lightweight aggregate at the rotating speed of 100rpm for 2 min;
2) stirring part of water, a water reducing agent, a tackifier, a complexing agent and a preservative for 5min at the rotating speed of 500 rpm;
3) stirring the mixture B in the step 2) and the mixture A in the step 1) for 30 seconds at a rotating speed of 90rpm, and then adding the rest water and stirring for 2 min.
Example 14
This embodiment is different from embodiment 11 in that: the raw materials also comprise 1kg of preservative which consists of sodium fluoride and acrylic resin according to the mass ratio of 2: 0.65. The rest is the same as in example 11.
Wherein the acrylic resin is water-based acrylic resin.
The preparation method of the ready-mixed steam-curing-free ultrahigh-performance concrete comprises the following steps:
1) stirring cement and lightweight aggregate at the rotating speed of 100rpm for 2 min;
2) stirring part of water, a water reducing agent, a tackifier, a complexing agent and a preservative for 5min at the rotating speed of 500 rpm;
3) stirring the mixture B in the step 2) and the mixture A in the step 1) for 30 seconds at a rotating speed of 90rpm, and then adding the rest water and stirring for 2 min.
Example 15
This embodiment is different from embodiment 11 in that: the raw materials also comprise 2kg of preservative which is composed of sodium fluoride and acrylic resin according to the mass ratio of 2: 0.65. The rest is the same as in example 11.
Wherein the acrylic resin is water-based acrylic resin.
The preparation method of the ready-mixed steam-curing-free ultrahigh-performance concrete comprises the following steps:
1) stirring cement and lightweight aggregate at the rotating speed of 100rpm for 2 min;
2) stirring part of water, a water reducing agent, a tackifier, a complexing agent and a preservative for 5min at the rotating speed of 500 rpm;
3) stirring the mixture B in the step 2) and the mixture A in the step 1) for 30 seconds at a rotating speed of 90rpm, and then adding the rest water and stirring for 2 min.
Comparative example
Comparative example 1
The ready-mixed steam-curing-free ultrahigh-performance concrete of the comparative example is prepared from the following raw materials in parts by weight: 900kg of cement, 1145kg of lightweight aggregate, 430kg of water and 20kg of water reducing agent.
Wherein the lightweight aggregate is composed of silica fume, fly ash, quartz powder and shale ceramsite according to the mass ratio of 3:2.5:2.5:0.25, the average particle size of the silica fume is 15nm, the fly ash is first-grade fly ash, the average particle size of the quartz powder is 55 mu m, and the continuous gradation of the average particle size of the shale ceramsite is 0.2-3 mm.
The preparation method of the ready-mixed steam-curing-free ultrahigh-performance concrete comprises the following steps:
1) stirring cement and lightweight aggregate at the rotating speed of 100rpm for 2 min;
2) stirring part of water and a water reducing agent at the rotating speed of 500rpm for 5 min;
3) stirring the mixture B in the step 2) and the mixture A in the step 1) for 30 seconds at a rotating speed of 90rpm, and then adding the rest water and stirring for 2 min. Comparative example 2
The ready-mixed steam-curing-free ultrahigh-performance concrete of the comparative example is prepared from the following raw materials in parts by weight: 900kg of cement, 400kg of lightweight aggregate, 745kg of coarse aggregate, 430kg of water and 20kg of water reducing agent.
The lightweight aggregate is composed of silica fume, fly ash, quartz powder and shale ceramsite according to the mass ratio of 3:2.5:2.5:0.25, the average particle size of the silica fume is 15nm, the fly ash is first-grade fly ash, the average particle size of the quartz powder is 55 microns, the continuous gradation of the average particle size of the shale ceramsite is 0.2-3mm, the coarse aggregate is sand stone, and the continuous gradation of the sand stone is 2-15 mm.
The preparation method of the ready-mixed steam-curing-free ultrahigh-performance concrete comprises the following steps:
1) stirring cement and lightweight aggregate at the rotating speed of 100rpm for 2 min;
2) stirring part of water and a water reducing agent at the rotating speed of 500rpm for 5 min;
3) stirring the mixture B in the step 2) and the mixture A in the step 1) for 30 seconds at a rotating speed of 90rpm, and then adding the rest water and stirring for 2 min.
Performance test
Detection method/test method
The premixed non-steam curing ultrahigh-performance concrete of the examples 1 to 15 and the comparative examples 1 to 2 are prepared into cubic workpieces of 150mm multiplied by 150mm in a grinding tool, grouped into a group A, and cured for 28 days at the temperature of 20 ℃ to 30 ℃.
The ready-mixed non-steam-curing ultrahigh-performance concrete prepared in the examples 1 to 15 and the comparative examples 1 to 2 is prepared into cubic workpieces of 150mm multiplied by 150mm in a grinding tool, grouped into a group B, and steam-cured for 48h to 3d under the conditions of 150MPa pressure and 90 ℃.
The cubic workpieces of the A group and the B group are tested for the compressive strength according to the GB/T50081-2002 standard, and the test results are shown in Table 2.
TABLE 2 test results of Ready-mixed non-autoclaved ultra-high Performance concrete work pieces in examples 1-15 and comparative examples 1-2
| Serial number | Compressive Strength of group A workpiece (MP) | Flexural strength of B group workpiece (MP) |
| Example 1 | 156.6 | 155.3 |
| Example 2 | 158.7 | 158.6 |
| Example 3 | 153.1 | 154.6 |
| Example 4 | 164.2 | 165.5 |
| Example 5 | 166.3 | 165.9 |
| Example 6 | 163.1 | 162.3 |
| Example 7 | 171.2 | 172.9 |
| Example 8 | 174.6 | 175.7 |
| Example 9 | 172.3 | 173.3 |
| Example 10 | 175.9 | 175.0 |
| Example 11 | 178.5 | 176.1 |
| Example 12 | 176.6 | 173.5 |
| Example 13 | 180.3 | 182.6 |
| Examples14 | 182.1 | 180.3 |
| Example 15 | 179.5 | 180.7 |
| Comparative example 1 | 106.5 | 113.5 |
| Comparative example 2 | 93.6 | 98.2 |
It can be seen from comparison of examples 1-4 and comparative examples 1-2 with Table 2 that the silica fume, fly ash, quartz powder and shale ceramsite in the lightweight aggregate have a greatly improved degree of compaction of the concrete, and the compressive strength of the concrete is greatly improved under the synergistic effect of the tackifier.
It can be seen from comparison of examples 1-4, examples 5-7 and comparative examples 1-2 with table 2 that the nano-layered composite material dispersed in the concrete plays a good role in filling and supporting, the micro-gap structure of the concrete is further improved, and the nano-layered composite material, silica fume, fly ash, quartz component and shale ceramsite play a role in compounding, so that the mechanical properties of the concrete are further improved.
As can be seen by comparing examples 1-7, examples 8-9 and comparative examples 1-2 with Table 2, the polyacrylamide and the aqueous fumed silica improve the rheological property of the concrete cementing material, and greatly improve the cracking resistance and the strength of the concrete.
As can be seen from comparative examples 1 to 9, examples 10 to 12 and comparative examples 1 to 2 in combination with Table 2, the complexing agent retards the migration of chloride ions and improves the stability of concrete.
As can be seen from comparison of examples 1 to 12, examples 13 to 15 and comparative examples 1 to 2 with Table 2, the corrosion inhibitor improves the homogeneity and corrosion resistance of the concrete and improves the mechanical properties of the concrete.
As can be seen by comparing the groups A and B of examples 1-15 and comparative examples 1-2 and combining Table 2, the compressive strengths of the group A and the group B in examples 1-15 are not greatly different, and the concrete of the application has the advantages of no steam curing and convenient construction.
In conclusion, under the compounding synergistic effect of the silica fume, the fly ash, the quartz powder, the shale ceramisite and the nano layered mineral composite material and the auxiliary effect of the tackifier, the premixed steam curing-free ultrahigh-performance concrete has the advantages of good compression resistance and steam curing-free performance.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (2)
1. The premixed steam-curing-free ultrahigh-performance concrete is characterized by being mainly prepared from the following raw materials in parts by weight: 1100 parts of cement 900-; the lightweight aggregate is composed of silica fume, fly ash, quartz powder, shale ceramsite and nano layered mineral composite material according to the mass ratio of (3-4): 2.5-3.5): 2.5-3): 0.25-0.35): 0.15-0.25; the nano layered mineral composite material consists of nano layered kaolin, nano layered montmorillonite and nano layered mica according to the mass ratio of (5-10) to (1-3) to (1.5-2); the tackifier comprises aliphatic amine and polyacrylamide, and the mass ratio of the polyacrylamide to the aliphatic amine is (0.15-0.3) to (1-3); the complexing agent is composed of quaternary ammonium salt and hydroxyquinoline according to the mass ratio of (1-2) to (0.2-0.5); the preservative comprises sodium fluoride and acrylic resin, wherein the mass ratio of the sodium fluoride to the acrylic resin is (1-3) to (0.5-1).
2. The ready-mixed steam-curing-free ultra-high performance concrete according to claim 1, characterized in that: the average grain diameter of the silica fume is 10-20 nm.
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