CN111499294A - Ultrahigh-performance concrete dry powder and preparation method thereof - Google Patents
Ultrahigh-performance concrete dry powder and preparation method thereof Download PDFInfo
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- CN111499294A CN111499294A CN202010204912.6A CN202010204912A CN111499294A CN 111499294 A CN111499294 A CN 111499294A CN 202010204912 A CN202010204912 A CN 202010204912A CN 111499294 A CN111499294 A CN 111499294A
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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
- C04B2103/50—Defoamers, air detrainers
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- 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
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- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention relates to an ultra-high performance concrete dry powder material and a preparation method thereof, wherein the material is composed of the following raw materials in parts by weight: 260-350 parts of cement, 40-100 parts of silica fume, 80-120 parts of superfine mineral admixture, 50-100 parts of steel fiber, 2-10 parts of polycarboxylic acid water reducing agent, 0.02-0.1 part of defoaming agent, 30-50 parts of shrinkage inhibitor, 400-550 parts of quartz sand and 0.5-1 part of nano aluminum hydroxide. The invention adopts dry mixing process to produce, the obtained ultra-high performance concrete dry powder product only needs to add water with 6-9% of the dry powder mass on site, and adopts common concrete mixing equipment to mix, thus obtaining better fluidity for the pumping construction of the cast-in-place engineering. The mixture of the invention has good fluidity, low viscosity, high mechanical property, low hydration heat, good volume stability and high durability, and is particularly suitable for concrete structure engineering with high mechanical property requirements or high fatigue toughness and high durability requirements.
Description
Technical Field
The invention relates to the technical field of inorganic nonmetal-based composite materials, in particular to ultra-high performance concrete dry powder and a preparation method thereof.
Background
The ultra-high performance concrete is a cement-based material obtained by mixing fine aggregate, cement, high-activity admixture, high-efficiency water reducing agent, steel fiber and the like and adopting proper preparation, forming and maintenance processes, and the material has the remarkable characteristics of ultra-high strength, ultra-high durability, high toughness and good volume stability and can well meet some special engineering requirements. However, due to the ultra-low water-cement ratio and the ultra-high cement consumption, the viscosity of the mixture is high, the shrinkage is large and the hydration heat is large, steam curing is often needed in the preparation process, and the harsh condition is difficult to realize in a cast-in-place structure. Most of the actual projects need cast-in-place construction, so that large-area popularization and application of the cast-in-place construction in the projects are restricted. If the ultra-high performance concrete with low viscosity, low shrinkage and low hydration heat can be prepared by starting from the dispersant, the large-dosage ultra-fine mineral admixture and the composite expanding agent, the application field of the ultra-high performance concrete is inevitably greatly expanded.
Disclosure of Invention
The invention aims to provide an ultrahigh-performance concrete dry powder material and a preparation method thereof, and aims to solve the problems of high viscosity, large shrinkage and large hydration heat of common ultrahigh-performance concrete in the background art and the problem that the common ultrahigh-performance concrete is difficult to apply in cast-in-place engineering under harsh maintenance conditions.
In order to achieve the purpose, the invention provides the following technical scheme:
the ultra-high performance concrete dry powder material comprises the following raw materials in parts by weight: 260-350 parts of cement, 40-100 parts of silica fume, 80-120 parts of superfine mineral admixture, 50-100 parts of steel fiber, 2-10 parts of polycarboxylic acid water reducing agent, 0.02-0.1 part of defoaming agent, 30-50 parts of shrinkage inhibitor, 0.5-1 part of nano aluminum hydroxide and 400-550 parts of quartz sand.
Further, the cement is P.O 52.5 cement, and the specific surface area is 450-500 m2Per kg; the silica fume SiO2The content is not less than 98%, and the average particle size is 0.16-0.19 mu m; the polycarboxylate superplasticizer is powder, and the water reducing rate of the polycarboxylate superplasticizer is not less than 35%; the water content of the quartz sand is less than 0.1 percent, and the SiO content is2The content is not less than 98 percent, and the grain size is 0.15-1.18 mm.
Further, the ultra-high performance concrete dry powder is prepared by the following method:
(1) adding slag, fly ash, ceramic powder, red mud, dihydrate gypsum and a grinding-aid excitant into a superfine open-flow powder separation tube mill, and grinding for 30-60 min;
(2) the specific surface area selected by a superfine air separation system reaches 700-900 m2Per kg of ultrafine powder to obtain the ultrafine mineral admixture.
Further, in the step (1), the mass ratio of the slag, the fly ash, the ceramic powder, the red mud, the dihydrate gypsum and the grinding-assisting excitant is 30: 30-40: 10-12: 8-10: 2-3: 0.1 to 0.2.
Further, in the step (1), the grinding-assisting exciting agent is composed of the following raw materials in parts by weight: 10-20 parts of triethanolamine, 5-6 parts of sodium dodecyl benzene sulfonate, 2-3 parts of acrylic glycidyl ether, 3-5 parts of polymeric aluminum ferric silicate, 10-15 parts of sodium silicate, 5-10 parts of magnesium hexafluorosilicate and the balance of water.
Further, the steel fiber comprises the following components in parts by weight: 30-40 parts of copper-plated steel fibers with the length of 8mm, 20-30 parts of copper-plated steel fibers with the length of 12mm, and 20-30 parts of bow-shaped copper-plated steel fibers with the length of 22mm, wherein the diameters of the steel fibers are 0.1-0.12 mm, and the tensile strength is not lower than 2850 MPa.
Further, the defoaming agent is composed of the following raw materials in parts by weight: 20-25 parts of polydimethylsiloxane, 10-15 parts of fluorosilicone and 60-70 parts of fumed silica.
Further, the shrinkage inhibitor consists of the following raw materials in parts by weight: 98-99 parts of magnesium oxide and 1-2 parts of azodicarbonamide.
Further, the purity of the nano aluminum hydroxide reaches 99.99%, the average particle size is 30nm, and the specific surface area is 150000-175000 m2/kg。
The invention also provides a preparation method of the ultra-high performance concrete dry powder material, which comprises the following steps:
p1: adding 260-350 parts of cement, 40-100 parts of silica fume, 80-120 parts of superfine mineral admixture, 30-50 parts of shrinkage inhibitor and 400-550 parts of quartz sand into a homogenizer A for homogenizing and stirring for 2-3 min, continuing homogenizing and stirring, uniformly adding 2-10 parts of polycarboxylic acid water reducer, 0.02-0.1 part of defoaming agent and 0.5-1 part of nano aluminum hydroxide, uniformly stirring for 4-5 min, and obtaining a mixture A, wherein the rotating speed of the homogenizer is 150-195 r/min;
p2: adding the mixture A obtained from P1 into a homogenizer B, uniformly adding 50-100 parts of steel fibers in the stirring process, uniformly stirring for 3-5 min at the rotating speed of the homogenizer of 60-90 r/min; and obtaining the ultrahigh-performance concrete dry powder.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, cement, silica fume and a self-made superfine mineral admixture are compounded in a certain proportion to form an ultra-high performance concrete gelling system, so that the cement consumption is greatly reduced, and the shrinkage and the hydration heat are reduced; meanwhile, the compact packing principle is utilized, the proportion of the components is reasonably allocated, so that the whole system reaches the closest packing state, and the ultrahigh mechanical property is obtained.
2. The self-made ultrafine mineral admixture greatly utilizes industrial waste residues, conforms to the sustainable development concept, and improves the additional value of solid waste resource utilization; by using the ultra-fine grinding technology and the ultra-dispersion technology and the excitation technology, and simultaneously utilizing the ball effect of the fly ash, the ultra-high activity and the viscosity reduction effect of the ultra-fine mineral admixture can be realized.
3. The multistage fiber composite is adopted to improve the effective utilization rate of the fiber, thereby improving the toughness of the material and avoiding the problems that the single short and straight fiber has low contribution rate to the flexural resistance of the material or the single bow-shaped fiber is easy to agglomerate and is difficult to disperse; the steel fiber material with the same volume and the doping amount has higher fracture resistance and better toughness.
4. The composite shrinkage inhibitor can compensate the shrinkage of materials in different time periods, and the property that amide organic matters are easy to decompose in an alkaline environment to generate nitrogen is utilized to adjust the ultrahigh-performance concrete to achieve no shrinkage or micro expansion in a plasticity stage; the magnesium oxide expanding agent can generate uniform expansion effect after the ultra-high performance concrete is hardened, so that the ultra-high performance concrete is free from shrinkage or micro-expansion in the later period.
5. The nano material effect is adopted to adjust the modified reinforcing material system, so that the formation of a hydration reaction microstructure can be promoted, and the self-compactness, low viscosity, low shrinkage, high toughness, ultrahigh strength and ultrahigh durability of the ultrahigh-performance concrete at normal temperature can be finally realized.
Drawings
FIG. 1 shows the morphology of an example ultra-high performance concrete 28 d-age hydration product.
FIG. 2 shows the bonding condition of the ultra-high performance concrete 28 d-age hydrated gel and the fine aggregate interface transition zone.
Detailed Description
The present invention will be described in detail with reference to specific examples, but the scope of the present invention is not limited to the examples.
Example 1
The ultra-high performance concrete dry powder material comprises the following raw materials in parts by weight: 260 parts of cement, 40 parts of silica fume, 80 parts of superfine mineral admixture, 50 parts of steel fiber, 2 parts of polycarboxylic acid water reducing agent, 0.02 part of defoaming agent, 30 parts of shrinkage inhibitor, 0.5 part of nano aluminum hydroxide and 400 parts of quartz sand.
The cement is P.O 52.5 cement with the specific surface area of 450m2Per kg; the silica fume SiO2The content is 99.2 percent, and the average grain diameter is 0.16 mu m; the polycarboxylate superplasticizer is powder, and has a water reducing rate of 35%; the water content of the quartz sand is 0.05 percent, and SiO is generated2The content is 98.5%, and the grain size is 0.15-1.18 mm.
The superfine mineral admixture is prepared by the following method:
(1) adding slag, fly ash, ceramic powder, red mud, dihydrate gypsum and grinding-aid excitant into a superfine open-flow powder selecting tube mill, and grinding for 30 min;
(2) the specific surface area of the ultrafine powder selected by the ultrafine air separation system is 700m2And/kg, obtaining the superfine mineral admixture.
In the step (1), the mass ratio of the slag, the fly ash, the ceramic powder, the red mud, the dihydrate gypsum and the grinding-assisting excitant is 30: 30: 10: 8: 2: 0.1.
in the step (1), the grinding-assisting excitant is composed of the following raw materials in parts by weight: 10 parts of triethanolamine, 5 parts of sodium dodecyl benzene sulfonate, 2 parts of acrylic glycidyl ether, 3 parts of polymeric aluminum ferric silicate, 10 parts of sodium silicate, 5 parts of hexafluoromagnesium silicate and the balance of water.
The steel fiber comprises the following components in parts by weight: 30 parts of copper-plated steel fiber with the length of 8mm, 20 parts of copper-plated steel fiber with the length of 12mm and 20 parts of bow-shaped copper-plated steel fiber with the length of 22mm, wherein the diameters of the steel fibers are all 0.1mm, and the tensile strength is 2860 MPa.
The defoaming agent comprises the following raw materials in parts by weight: 20 parts of polydimethylsiloxane, 10 parts of fluorosilicone and 60 parts of fumed silica.
The shrinkage inhibitor consists of the following raw materials in parts by weight: 98 parts of magnesium oxide and 2 parts of azodicarbonamide.
Purity of the nano aluminum hydroxide99.99%, average grain size of 30nm, specific surface area of 150000m2/kg。
Example 1 a method for preparing ultra-high performance concrete dry powder, comprising the steps of:
p1: adding 260 parts of cement, 40 parts of silica fume, 80 parts of superfine mineral admixture, 30 parts of shrinkage inhibitor and 400 parts of quartz sand into a homogenizer A for homogenizing and stirring for 2min, continuing homogenizing and stirring, uniformly adding 2 parts of polycarboxylic acid water reducing agent, 0.02 part of defoaming agent and 0.5 part of nano aluminum hydroxide, uniformly stirring for 4min to obtain a mixture A, wherein the rotating speed of the homogenizer is 150 r/min;
p2: adding the mixture A obtained from P1 into a homogenizer B, uniformly adding 50 parts of steel fiber in the stirring process, uniformly stirring for 3min at the rotating speed of the homogenizer of 60 r/min; and obtaining the ultrahigh-performance concrete dry powder.
Example 2
The ultra-high performance concrete dry powder material comprises the following raw materials in parts by weight: 350 parts of cement, 100 parts of silica fume, 120 parts of superfine mineral admixture, 100 parts of steel fiber, 10 parts of polycarboxylic acid water reducing agent, 0.1 part of defoaming agent, 50 parts of shrinkage inhibitor, 1 part of nano aluminum hydroxide and 550 parts of quartz sand.
The cement is P.O 52.5 cement with a specific surface area of 500m2Per kg; the silica fume SiO2The content is 99.2 percent, and the average grain diameter is 0.16 mu m; the polycarboxylate superplasticizer is powder, and has a water reducing rate of 35%; the water content of the quartz sand is 0.05 percent, and SiO is generated2The content is 98.5%, and the grain size is 0.15-1.18 mm.
The superfine mineral admixture is prepared by the following method:
(1) adding slag, fly ash, ceramic powder, red mud, dihydrate gypsum and grinding-aid excitant into a superfine open-flow powder selecting tube mill, and grinding for 60 min;
(2) the specific surface area of the ultrafine powder selected by the ultrafine air separation system is 900m2And/kg, obtaining the superfine mineral admixture.
In the step (1), the mass ratio of the slag, the fly ash, the ceramic powder, the red mud, the dihydrate gypsum and the grinding-assisting excitant is 30: 40: 12: 10: 3: 0.2.
in the step (1), the grinding-assisting excitant is composed of the following raw materials in parts by weight: 20 parts of triethanolamine, 6 parts of sodium dodecyl benzene sulfonate, 3 parts of acrylic glycidyl ether, 5 parts of polymeric aluminum ferric silicate, 15 parts of sodium silicate, 10 parts of hexafluoromagnesium silicate and the balance of water.
The steel fiber comprises the following components in parts by weight: 40 parts of copper-plated steel fiber with the length of 8mm, 30 parts of copper-plated steel fiber with the length of 12mm and 30 parts of bow-shaped copper-plated steel fiber with the length of 22mm, wherein the diameters of the steel fibers are all 0.12mm, and the tensile strength is 2860 MPa.
The defoaming agent comprises the following raw materials in parts by weight: 25 parts of polydimethylsiloxane, 15 parts of fluorosilicone and 70 parts of fumed silica.
The shrinkage inhibitor consists of the following raw materials in parts by weight: 99 parts of magnesium oxide and 1 part of azodicarbonamide.
The purity of the nano aluminum hydroxide reaches 99.99 percent, the average particle size is 30nm, and the specific surface area is 150000m2/kg。
Example 2 a method for preparing ultra-high performance concrete dry powder, comprising the steps of:
p1: adding 350 parts of cement, 100 parts of silica fume, 120 parts of superfine mineral admixture, 50 parts of shrinkage inhibitor and 550 parts of quartz sand into a homogenizer A for homogenizing and stirring for 3min, continuing homogenizing and stirring, uniformly adding 10 parts of polycarboxylic acid water reducer, 0.1 part of defoaming agent and 1 part of nano aluminum hydroxide, and uniformly stirring for 5min to obtain a mixture A, wherein the rotating speed of the homogenizer is 195 r/min;
p2: adding the mixture A obtained from P1 into a homogenizer B, uniformly adding 100 parts of steel fiber in the stirring process, uniformly stirring for 5min at the rotating speed of the homogenizer of 90 r/min; and obtaining the ultrahigh-performance concrete dry powder.
Example 3
The ultra-high performance concrete dry powder material comprises the following raw materials in parts by weight: 300 parts of cement, 80 parts of silica fume, 100 parts of superfine mineral admixture, 80 parts of steel fiber, 5 parts of polycarboxylic acid water reducing agent, 0.05 part of defoaming agent, 40 parts of shrinkage inhibitor, 0.8 part of nano aluminum hydroxide and 500 parts of quartz sand.
SaidThe cement is P.O 52.5 cement with specific surface area of 480m2Per kg; the silica fume SiO2The content is 99.2 percent, and the average grain diameter is 0.16 mu m; the polycarboxylate superplasticizer is powder, and has a water reducing rate of 35%; the water content of the quartz sand is 0.05 percent, and SiO is generated2The content is 98.5%, and the grain size is 0.15-1.18 mm.
The superfine mineral admixture is prepared by the following method:
(1) adding slag, fly ash, ceramic powder, red mud, dihydrate gypsum and grinding-aid excitant into a superfine open-flow powder selecting tube mill, and grinding for 50 min;
(2) the specific surface area of the ultrafine powder selected by the ultrafine air separation system is 850m2And/kg, obtaining the superfine mineral admixture.
In the step (1), the mass ratio of the slag, the fly ash, the ceramic powder, the red mud, the dihydrate gypsum and the grinding-assisting excitant is 30: 35: 11: 9: 2.5: 0.15.
in the step (1), the grinding-assisting excitant is composed of the following raw materials in parts by weight: 15 parts of triethanolamine, 5.5 parts of sodium dodecyl benzene sulfonate, 2.5 parts of acrylic glycidyl ether, 4 parts of polymeric aluminum ferric silicate, 13 parts of sodium silicate, 8 parts of hexafluoromagnesium silicate and the balance of water.
The steel fiber comprises the following components in parts by weight: 35 parts of copper-plated steel fiber with the length of 8mm, 25 parts of copper-plated steel fiber with the length of 12mm and 28 parts of bow-shaped copper-plated steel fiber with the length of 22mm, wherein the diameters of the steel fibers are 0.11mm, and the tensile strength is 2860 MPa.
The defoaming agent comprises the following raw materials in parts by weight: 23 parts of polydimethylsiloxane, 13 parts of fluorosilicone and 65 parts of fumed silica.
The shrinkage inhibitor consists of the following raw materials in parts by weight: 98.5 parts of magnesium oxide and 1.5 parts of azodicarbonamide.
The purity of the nano aluminum hydroxide reaches 99.99 percent, the average particle size is 30nm, and the specific surface area is 150000m2/kg。
Example 3 a method for preparing ultra-high performance concrete dry powder, comprising the steps of:
p1: adding 300 parts of cement, 80 parts of silica fume, 100 parts of superfine mineral admixture, 40 parts of shrinkage inhibitor and 500 parts of quartz sand into a homogenizer A for homogenizing and stirring for 3min, continuing homogenizing and stirring, uniformly adding 5 parts of polycarboxylic acid water reducing agent, 0.05 part of defoaming agent and 0.8 part of nano aluminum hydroxide, uniformly stirring for 5min to obtain a mixture A, wherein the rotating speed of the homogenizer is 180 r/min;
p2: adding the mixture A obtained from P1 into a homogenizer B, uniformly adding 80 parts of steel fiber in the stirring process, uniformly stirring for 5min at the rotating speed of the homogenizer of 80 r/min; and obtaining the ultrahigh-performance concrete dry powder.
Comparative example 1
The difference from example 3 is that the mineral admixture used in comparative example 1 is a commercial S105 grade ore powder with a specific surface area of 450m2/kg。
Comparative example 2
The difference from example 3 is that the grinding aid activator used in comparative example 2 is free of polyaluminum ferric silicate and magnesium hexafluorosilicate.
Comparative example 3
The difference from example 3 is that the copper-plated steel fiber used in comparative example 3 is a single 12mm copper-plated steel fiber.
Comparative example 4
The difference from the example 3 is that the shrinkage inhibitor used in the comparative example 4 is a commercial concrete composite expansion agent.
Comparative example 5
The difference from example 3 is that the aluminum hydroxide used in comparative example 5 is non-nanoscale aluminum hydroxide.
And (3) performance testing:
the performance test is carried out on the ultra-high performance concrete admixture prepared in the embodiment 1-3 and the comparative example 1-5, the unified water consumption is 6.5% of the dry powder mass, and the working performance, the mechanical performance and the durability test are carried out according to GB/T50080-2016 ordinary concrete mixture performance test method standard, GB/T50081-2016-ordinary concrete mechanical performance test method standard and GB/T50082-2009-ordinary concrete long-term performance and durability test method standard. The test results are shown in Table 1.
Table 1 results of performance testing
As can be seen from Table 1, the ultra-high performance concrete in examples 1 to 3 of the present invention has low viscosity, good workability, small plastic shrinkage and drying shrinkage, high flexural strength, low heat of hydration, and superior performance to the concrete in comparative examples 1 to 5.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The ultra-high performance concrete dry powder material is characterized by comprising the following raw materials in parts by weight: 260-350 parts of cement, 40-100 parts of silica fume, 80-120 parts of superfine mineral admixture, 50-100 parts of steel fiber, 2-10 parts of polycarboxylic acid water reducing agent, 0.02-0.1 part of defoaming agent, 30-50 parts of shrinkage inhibitor, 0.5-1 part of nano aluminum hydroxide and 400-550 parts of quartz sand.
2. The dry powder material for ultrahigh-performance concrete as claimed in claim 1, wherein the cement is P.O 52.5 cement, and the specific surface area is 450-500 m2Per kg; the silica fume SiO2The content is not less than 98%, and the average particle size is 0.16-0.19 mu m; the polycarboxylate superplasticizer is powder, and the water reducing rate of the polycarboxylate superplasticizer is not less than 35%; the water content of the quartz sand is less than 0.1 percent, and the SiO content is2The content is not less than 98 percent, and the grain size is 0.15-1.18 mm.
3. The dry powder material for ultra-high performance concrete as claimed in claim 1, wherein said ultra-fine mineral admixture is prepared by the following method:
(1) adding slag, fly ash, ceramic powder, red mud, dihydrate gypsum and a grinding-aid excitant into a superfine open-flow powder separation tube mill, and grinding for 30-60 min;
(2) the specific surface area selected by a superfine air separation system reaches 700-900 m2Per kg of ultrafine powder to obtain the ultrafine mineral admixture.
4. The ultra-high performance concrete dry powder material as claimed in claim 3, wherein in the step (1), the mass ratio of the slag, the fly ash, the ceramic powder, the red mud, the dihydrate gypsum and the grinding-assisting excitant is 30: 30-40: 10-12: 8-10: 2-3: 0.1 to 0.2.
5. The ultra-high performance concrete dry powder material as claimed in claim 3, wherein in the step (1), the grinding-assisting excitant is composed of the following raw materials by weight: 10-20 parts of triethanolamine, 5-6 parts of sodium dodecyl benzene sulfonate, 2-3 parts of acrylic glycidyl ether, 3-5 parts of polymeric aluminum ferric silicate, 10-15 parts of sodium silicate, 5-10 parts of magnesium hexafluorosilicate and the balance of water.
6. The dry powder for ultra-high performance concrete according to claim 1, wherein the steel fibers are composed of the following components by weight: 30-40 parts of copper-plated steel fibers with the length of 8mm, 20-30 parts of copper-plated steel fibers with the length of 12mm, and 20-30 parts of bow-shaped copper-plated steel fibers with the length of 22mm, wherein the diameters of the steel fibers are 0.1-0.12 mm, and the tensile strength is not lower than 2850 MPa.
7. The ultra-high performance concrete dry powder material as claimed in claim 1, wherein the defoaming agent comprises the following raw materials by weight: 20-25 parts of polydimethylsiloxane, 10-15 parts of fluorosilicone and 60-70 parts of fumed silica.
8. The ultra-high performance concrete dry powder material as claimed in claim 1, wherein the shrinkage inhibitor is prepared from the following raw materials in parts by weight: 98-99 parts of magnesium oxide and 1-2 parts of azodicarbonamide.
9. The ultra-high performance concrete dry powder material of claim 1, wherein the purity of the nano aluminum hydroxide is up to 99.99%, the average particle size is 30nm, and the specific surface area is 150000-175000 m2/kg。
10. The method for preparing the ultra-high performance concrete dry powder material according to any one of claims 1 to 9, characterized by comprising the following steps:
p1: adding 260-350 parts of cement, 40-100 parts of silica fume, 80-120 parts of superfine mineral admixture, 30-50 parts of shrinkage inhibitor and 400-550 parts of quartz sand into a homogenizer A for homogenizing and stirring for 2-3 min, continuing homogenizing and stirring, uniformly adding 2-10 parts of polycarboxylic acid water reducer, 0.02-0.1 part of defoaming agent and 0.5-1 part of nano aluminum hydroxide, uniformly stirring for 4-5 min, and obtaining a mixture A, wherein the rotating speed of the homogenizer is 150-195 r/min;
p2: adding the mixture A obtained from P1 into a homogenizer B, uniformly adding 50-100 parts of steel fibers in the stirring process, uniformly stirring for 3-5 min at the rotating speed of the homogenizer of 60-90 r/min; and obtaining the ultrahigh-performance concrete dry powder.
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| CN115872694B (en) * | 2022-07-07 | 2024-02-02 | 桂林理工大学 | Ultra-high performance concrete of modified multiwall carbon nanotube and preparation method thereof |
| CN115893953A (en) * | 2022-12-23 | 2023-04-04 | 江西省建材科研设计院有限公司 | Low-shrinkage ultrahigh-performance concrete and preparation method thereof |
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