CN117263558A - Superfine powder special for commercial concrete and preparation method thereof - Google Patents
Superfine powder special for commercial concrete and preparation method thereof Download PDFInfo
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- CN117263558A CN117263558A CN202311208749.0A CN202311208749A CN117263558A CN 117263558 A CN117263558 A CN 117263558A CN 202311208749 A CN202311208749 A CN 202311208749A CN 117263558 A CN117263558 A CN 117263558A
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- 239000000843 powder Substances 0.000 title claims abstract description 106
- 239000004567 concrete Substances 0.000 title claims abstract description 89
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 239000002893 slag Substances 0.000 claims abstract description 68
- 239000010881 fly ash Substances 0.000 claims abstract description 62
- 238000000227 grinding Methods 0.000 claims abstract description 36
- 239000002994 raw material Substances 0.000 claims abstract description 33
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 32
- 239000010440 gypsum Substances 0.000 claims abstract description 32
- 238000002156 mixing Methods 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000003756 stirring Methods 0.000 claims abstract description 25
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 21
- 239000011325 microbead Substances 0.000 claims abstract description 19
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 19
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 18
- 239000011575 calcium Substances 0.000 claims abstract description 16
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 9
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 229920000570 polyether Polymers 0.000 claims description 6
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 5
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims description 5
- 150000004683 dihydrates Chemical class 0.000 claims description 5
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 5
- 235000011152 sodium sulphate Nutrition 0.000 claims description 5
- WUGQZFFCHPXWKQ-UHFFFAOYSA-N Propanolamine Chemical compound NCCCO WUGQZFFCHPXWKQ-UHFFFAOYSA-N 0.000 claims description 4
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 4
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims description 4
- 238000004806 packaging method and process Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 229920000728 polyester Polymers 0.000 claims description 3
- 235000011118 potassium hydroxide Nutrition 0.000 claims description 3
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims description 3
- 229910052939 potassium sulfate Inorganic materials 0.000 claims description 3
- 235000011151 potassium sulphates Nutrition 0.000 claims description 3
- 238000010298 pulverizing process Methods 0.000 claims description 3
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 2
- 239000000920 calcium hydroxide Substances 0.000 claims description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 2
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 2
- 239000011737 fluorine Substances 0.000 claims description 2
- 229910052731 fluorine Inorganic materials 0.000 claims description 2
- 239000004568 cement Substances 0.000 abstract description 21
- 230000000694 effects Effects 0.000 abstract description 16
- 238000006703 hydration reaction Methods 0.000 abstract description 7
- 239000000654 additive Substances 0.000 abstract description 5
- 230000036571 hydration Effects 0.000 abstract description 5
- 239000002440 industrial waste Substances 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 11
- 239000011707 mineral Substances 0.000 description 11
- 235000010755 mineral Nutrition 0.000 description 11
- 239000000463 material Substances 0.000 description 10
- 230000006872 improvement Effects 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- DGVVJWXRCWCCOD-UHFFFAOYSA-N naphthalene;hydrate Chemical compound O.C1=CC=CC2=CC=CC=C21 DGVVJWXRCWCCOD-UHFFFAOYSA-N 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
- C04B40/0042—Powdery mixtures
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses superfine powder special for commercial concrete and a preparation method thereof, wherein the superfine powder comprises the following raw materials: superfine slag micropowder, superfine fly ash, silica fume, primary fly ash, high-calcium powder, gypsum, microbeads, grinding aid, exciting agent and powder water reducer; the invention uses industrial waste residues such as slag micropowder, silica fume, microbeads and the like as main raw materials, and prepares the special concrete admixture for the commercial concrete through the technological processes of coarse grinding, superfine grinding, mixing and stirring and the like, so that the special concrete admixture not only maintains the characteristics of low original hydration heat and good durability, but also can reach PO42.5 cement strength after 3 days, has strength far higher than PO42.5 cement strength after 28 days, can be widely used in commercial concrete with various strength grades, has low water demand, good workability, high strength, good activity and durability, strong adaptability with cement and additives, excellent performance, remarkably reduced consumption and concrete admixture cost to a certain extent.
Description
Technical Field
The invention relates to the technical field of concrete preparation, in particular to superfine powder special for commercial concrete and a preparation method thereof.
Background
Commercial concrete is a common concrete which is used for commercial use, the aggregate is glued into an integral engineering composite material by cementing materials, the term of concrete is generally used for cement as cementing materials, sand and stone are used as aggregates, and the cement concrete is obtained by mixing the cement with water (with or without additives and admixtures) according to a certain proportion, stirring, forming and curing, and is also called ordinary concrete, and is widely applied to civil engineering.
The existing mineral admixture improves the service performance of concrete to a certain extent, but has the problems of low self-hydration speed, lower 28-day strength than cement and the like, wherein,
the granulated blast furnace slag powder is widely used as one of the most common admixture in the concrete industry, and has the advantages of low hydration heat, good durability, and the use amount of the granulated blast furnace slag powder in the concrete industry is always controlled between 20 percent and 40 percent, mainly because the hydration speed of the granulated blast furnace slag powder is low, and the 28-day strength of the granulated blast furnace slag powder is slightly lower than that of cement;
in addition, the mineral powder is mainly a fine powdery material obtained by a series of processing processes of blast furnace slag, the raw material resources are short, particularly false mineral powder appears in some areas, the adverse effects of poor quality and instability are brought, the manufacturing cost of concrete is increased, and the risk of quality control is increased;
in addition, along with the increasingly diminishing natural resources, coal is used as non-renewable natural resources, the application of the fly ash is wider and wider, the fly ash is also obviously and sufficiently precious, and the market price is increased, so that the cost of the commercial concrete is increased.
Disclosure of Invention
Aiming at the problems, the invention aims to provide superfine powder special for commercial concrete and a preparation method thereof, and solves the problems that the existing admixture for concrete has low self-hydration speed, strength of 28 days is lower than that of cement, the manufacturing cost of concrete is increased, the risk of quality control is increased, and the cost of commercial concrete is increased.
In order to achieve the purpose of the invention, the invention is realized by the following technical scheme: the superfine powder special for the commercial concrete comprises the following raw materials in percentage by mass: 20 to 50 percent of superfine slag micropowder, 10 to 50 percent of superfine fly ash, 5 to 25 percent of silica fume, 5 to 25 percent of primary fly ash, 5 to 10 percent of high-calcium powder, 3 to 20 percent of gypsum, 5 to 25 percent of microbeads, 0.5 to 3 percent of grinding aid, 0.5 to 3 percent of exciting agent and 0.5 to 3 percent of powder water reducer.
The further improvement is that: the superfine slag micropowder is superfine powder, the particle size of the superfine slag micropowder is 5-30 um, and the specific surface area of the superfine slag micropowder is 400m 2 /g～1100m 2 /g。
The further improvement is that: the superfine fly ash is superfine powder, the grain diameter of the superfine fly ash is 1 um-20 um, and the specific surface area of the superfine fly ash is 500m 2 /g～1200m 2 /g。
The further improvement is that: the gypsum is selected from one or more of natural dihydrate gypsum, desulfurized gypsum, fluorine gypsum or phosphogypsum.
The further improvement is that: the grinding aid is selected from one or more of diethanolamine, triethanolamine or propanolamine.
The further improvement is that: the exciting agent is selected from one or more of sodium sulfate, sodium hydroxide, potassium sulfate, potassium hydroxide or slaked lime.
The further improvement is that: the powder water reducer is one or more selected from five-carbon polyether, six-carbon polyether or polyester.
The preparation method of the superfine powder special for the commercial concrete comprises the following steps:
step one: firstly, preparing enough slag raw materials according to actual preparation needs, then conveying the slag raw materials to a slag vertical mill for coarse grinding through metering conveying equipment, preparing slag micro powder, conveying the slag micro powder to an ultrafine grinding machine for grinding through the metering conveying equipment, and preparing the ultrafine slag micro powder with 1000-2500 meshes for later use;
step two: firstly, preparing enough raw fly ash according to actual preparation requirements, and then conveying the raw fly ash to an ultrafine pulverizer for pulverizing by metering conveying equipment to obtain ultrafine fly ash for later use;
step three: weighing 20-50% of superfine slag micropowder, 10-50% of ultrafine fly ash, 5-25% of silica fume, 5-25% of primary fly ash, 5-10% of high-calcium powder, 3-20% of gypsum, 5-25% of microbeads, 0.5-3% of grinding aid, 0.5-3% of exciting agent and 0.5-3% of powder water reducer as preparation raw materials by using the high-precision metering scale for standby in a batching warehouse;
step four: firstly, conveying the first-grade fly ash and the superfine fly ash prepared in the third step into a mixer for uniform stirring, and then sequentially adding superfine slag micropowder, silica fume, high-calcium powder, gypsum and microbeads into the mixer for continuous uniform mixing and stirring to prepare a primary mixture;
step five: and (3) after the preliminary mixture in the step (IV) is uniformly mixed, sequentially adding the grinding aid, the exciting agent and the powder water reducer into the preliminary mixture, continuously mixing and stirring, uniformly stirring to obtain superfine powder special for the commercial concrete, and packaging and warehousing.
The further improvement is that: the mixer is a mechanical and pneumatic conforming mixer, the mixing and stirring time of the primary fly ash and the superfine fly ash is 2-5 min, the mixing and stirring time of the superfine slag micropowder, the silica fume, the high-calcium powder, the gypsum and the microbeads is 3-5 min, and the mixing and stirring time of the grinding aid, the exciting agent and the powder water reducer is 3-5 min.
The beneficial effects of the invention are as follows: the slag micropowder, the silica fume, the microbeads and other industrial waste residues are used as main raw materials, and the superfine powder is prepared into the special concrete admixture for commercial concrete through the technological processes of coarse grinding, superfine grinding, mixing and stirring, so that the special concrete admixture has the characteristics of low original hydration heat and good durability, and meanwhile, the strength of the special concrete admixture can reach the PO42.5 cement strength in 3 days, and the strength of the special concrete admixture is far higher than the PO42.5 cement strength in 28 days, so that the special concrete admixture can be widely used for commercial concrete with various strength grades, and has the following main advantages:
1. low water demand and good workability: the superfine powder is spherical particles without porous materials, has finer fineness, can play roles of filling and ball lubrication in concrete, reduces the water consumption of the concrete and can greatly improve the workability of fresh concrete;
2. the strength is high: under the condition of the same cementing material, the superfine powder can improve one strength grade of commercial concrete, and under the condition of the same strength, the cement per side of the concrete can be reduced by 0-20 kg;
3. the activity is good: the superfine powder of the invention contains a large amount of active SiO 2 And Al 2 O 3 The component, ca (OH) generated by hydration with cement 2 Generating C-S-H gel and C-A-S-H gel by secondary pozzolan reaction, thereby greatly capturing high activity, adopting the product to replace cement detection activity by 30% according to mass fraction, wherein 7d standard raising activity is more than or equal to 80%,28d standard raising activity is more than or equal to 100%, replacing cement detection activity by 50% according to mass fraction, and improving activity in the same period by more than 5% compared with mineral powder;
4. the durability is good: the product can improve the compactness of the concrete and improve the structure of a transition zone of a concrete interface, thereby obviously improving the properties of chloride ion permeation resistance, freezing resistance, carbonization resistance and corrosion resistance of the concrete, and greatly prolonging the service life of the concrete;
5. has strong adaptability to cement and additives: the product has good adaptability to various grade cements, naphthalene water reducers and polycarboxylic acid water aquas;
6. the cost is reduced: the unilateral concrete adopting the product can save 3-10 yuan for clients, and can reduce the cost by 180-600 ten thousand yuan per year according to 6 ten thousand yuan per month.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic flow chart of a preparation method of superfine powder special for commercial concrete.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The superfine powder special for commercial concrete comprises the following raw materials in percentage by mass: 20 to 50 percent of superfine slag powder, 10 to 50 percent of superfine fly ash, 5 to 25 percent of silica fume, 5 to 25 percent of primary fly ash, 5 to 10 percent of high-calcium powder, 3 to 20 percent of gypsum, 5 to 25 percent of microbeads, 0.5 to 3 percent of grinding aid, 0.5 to 3 percent of exciting agent and 0.5 to 3 percent of powder water reducing agent, wherein the superfine slag powder and the superfine fly ash are superfine powder, the grain size of the superfine slag powder is 5um to 30um, and the specific surface area of the superfine slag powder is 400m 2 /g～1100m 2 Per gram, the grain diameter of the superfine fly ash is 1 um-20 um, the specific surface area of the superfine fly ash is 500m 2 /g～1200m 2 The gypsum is selected from one or more of natural dihydrate gypsum, desulfurized gypsum, fluorogypsum or phosphogypsum, the grinding aid is selected from one or more of diethanolamine, triethanolamine or propanolamine, and the excitant is selected from sodium sulfate, sodium hydroxide, potassium sulfate, potassium hydroxide or disinfectantThe invention uses slag micropowder, silica fume, micro beads and other industrial waste residues as main raw materials to prepare the concrete admixture with high durability and environmental protection.
Example 1
Referring to fig. 1, the embodiment provides a superfine powder special for commercial concrete, which comprises the following raw materials in percentage by mass: 20% of superfine slag micropowder, 50% of superfine fly ash, 5% of silica fume, 5% of primary fly ash, 5% of high-calcium powder, 3% of gypsum, 5% of microbeads, 1% of grinding aid, 3% of exciting agent and 3% of powder water reducing agent, wherein the superfine slag micropowder and the superfine fly ash are superfine powder, the particle size of the superfine slag micropowder is 5um, and the specific surface area of the superfine slag micropowder is 400m 2 Per gram, the grain diameter of the superfine fly ash is 1um, and the specific surface area of the superfine fly ash is 500m 2 The gypsum is natural dihydrate gypsum, the grinding aid is diethanolamine, the excitant is sodium sulfate, and the powder water reducer is five-carbon polyether.
The embodiment also provides a preparation method of the superfine powder special for the commercial concrete, which comprises the following steps:
step one: firstly, preparing enough slag raw materials according to actual preparation needs, conveying the slag raw materials to a factory raw material workshop by a vehicle, adding the slag raw materials into a feed hopper by a loader, conveying the slag raw materials to a slag vertical mill by metering conveying equipment for coarse grinding, preparing slag micro powder, conveying the slag micro powder to the ultra-fine mill by the metering conveying equipment for grinding, and preparing the ultra-fine slag micro powder with the granularity of 1000 meshes for later use;
step two: firstly, preparing enough raw fly ash according to actual preparation needs, transporting the raw fly ash to a factory raw material workshop by a tank truck, and then transporting the raw fly ash to an ultrafine mill for milling by metering and transporting equipment to obtain ultrafine fly ash for later use;
step three: before starting up production, firstly setting raw material proportion, raw material adding time and mixing time at each stage in a central control computer according to the product formula requirement, weighing 20% of superfine slag micropowder, 50% of superfine fly ash, 5% of silica fume, 5% of primary fly ash, 5% of high-calcium powder, 3% of gypsum, 5% of microbeads, 1% of grinding aid, 3% of exciting agent and 3% of powder water reducer as preparation raw materials by using a high-precision metering scale, and adding the materials into a batching warehouse for standby;
step four: firstly, conveying the first-grade fly ash and the superfine fly ash prepared in the step three into a mechanical pneumatic conforming mixer for stirring for 2min, and then sequentially adding superfine slag micropowder, silica fume, high-calcium powder, gypsum and microbeads into the mechanical pneumatic conforming mixer for continuous mixing and stirring for 3min to prepare a primary mixture;
step five: and (3) after the preliminary mixture in the step four is uniformly mixed, sequentially adding the grinding aid, the exciting agent and the powder water reducer into the preliminary mixture, continuously mixing and stirring for 3min, uniformly stirring to obtain superfine powder special for commodity concrete, packaging and warehousing, and arranging a bulk delivery and bagging system under a finished product warehouse, wherein the bulk delivery and bagging system can be sent to a customer unit according to requirements.
Example two
Referring to fig. 1, the embodiment provides a superfine powder special for commercial concrete, which comprises the following raw materials in percentage by mass: 50% of superfine slag micropowder, 10% of superfine fly ash, 6% of silica fume, 7% of primary fly ash, 8% of high-calcium powder, 9% of gypsum, 7% of microbeads, 2% of grinding aid, 0.5% of exciting agent and 0.5% of powder water reducing agent, wherein the superfine slag micropowder and the superfine fly ash are superfine powder, the particle size of the superfine slag micropowder is 30um, and the specific surface area of the superfine slag micropowder is 1100m 2 Per gram, the grain diameter of the superfine fly ash is 20um, and the specific surface area of the superfine fly ash is 1200m 2 The gypsum is prepared by mixing natural dihydrate gypsum, desulfurized gypsum, fluorogypsum and phosphogypsum according to the mass ratio of 1:1:1, the grinding aid is prepared by mixing diethanolamine, triethanolamine and propanolamine according to the mass ratio of 1:1:1, the excitant is prepared by mixing sodium sulfate and sodium hydroxide according to the mass ratio of 1:1, and the powder water reducer is prepared by mixing six-carbon polyether and polyester according to the mass ratio of 1:1.
The embodiment also provides a preparation method of the superfine powder special for the commercial concrete, which comprises the following steps:
step one: firstly, preparing enough slag raw materials according to actual preparation needs, conveying the slag raw materials to a factory raw material workshop by a vehicle, adding the slag raw materials into a feed hopper by a loader, conveying the slag raw materials to a slag vertical mill by metering conveying equipment for coarse grinding, preparing slag micro powder, conveying the slag micro powder to an ultrafine grinding machine by the metering conveying equipment for grinding, and preparing the ultrafine slag micro powder with 2500 meshes for later use;
step two: firstly, preparing enough raw fly ash according to actual preparation requirements, and then conveying the raw fly ash to an ultrafine pulverizer for pulverizing by metering conveying equipment to obtain ultrafine fly ash for later use;
step three: before starting up production, firstly setting raw material proportion, raw material adding time and mixing time at each stage in a central control computer according to the product formula requirement, weighing 50% of superfine slag micropowder, 10% of superfine fly ash, 6% of silica fume, 7% of primary fly ash, 8% of high-calcium powder, 9% of gypsum, 7% of microbeads, 2% of grinding aid, 0.5% of exciting agent and 0.5% of powder water reducer as preparation raw materials by using a high-precision metering scale, and adding the materials into a batching warehouse for standby;
step four: firstly, conveying the first-grade fly ash and the superfine fly ash prepared in the step three into a mechanical pneumatic conforming mixer for stirring for 5min, and then sequentially adding superfine slag micropowder, silica fume, high-calcium powder, gypsum and microbeads into the mechanical pneumatic conforming mixer for continuous stirring for 5min to prepare a primary mixture;
step five: and (3) after the preliminary mixture in the step four is uniformly mixed, sequentially adding the grinding aid, the exciting agent and the powder water reducer into the preliminary mixture, continuously mixing and stirring for 5min, uniformly stirring to obtain superfine powder special for commodity concrete, packaging and warehousing, and arranging a bulk delivery and bagging system under a finished product warehouse, wherein the bulk delivery and bagging system can be sent to a customer unit according to requirements.
The application method of the high-performance commercial concrete admixture (namely the superfine powder special for the commercial concrete prepared in the first embodiment and the second embodiment) is as follows:
A. the application method in commercial concrete comprises the following steps: under the condition of the same strength requirement, the cement per square concrete can be reduced by 10-20 kg while the traditional mineral powder is replaced by the admixture of the invention with equal mass; under the condition of the same cementing material, the equal mass of the admixture is adopted to replace mineral powder, so that the strength of the concrete at each age can be greatly improved;
B. the application method in cement comprises the following steps: the cement clinker mixing tray can be reduced by 5 to 10 percent by adopting the product to replace externally-doped mineral powder with equal mass and adopting the silicate cement with 525 and the above labels;
C. the method for detecting the activity of the admixture comprises the following steps: detecting according to the general rule in JG/T486-2015 composite admixture for concrete, namely, the admixture in the mortar mixture ratio accounts for 30% of the total mass of the cementing material; the activity of the additive can be compared with mineral powder according to GB/T18046-2017 method of granulating blast furnace slag powder for cement, mortar and concrete, namely the additive in the proportion of the gum sand accounts for 50% of the total mass of the cementing material.
Taking a commercial concrete of a certain mixing station C30 as an example, the effect of using the high-performance commercial concrete admixture of the invention is as follows:
the standard curing activity of the high-performance commercial concrete admixture and mineral powder is compared with that of the following table 1:
table 1 comparative table of standard curing activities
Examined rubber sand 1: mineral powder is added
Examined gum sand 2: adding high-performance commercial concrete admixture
The results of the concrete comparison experiments are shown in the following table 2:
table 2 comparative concrete composition table
Concrete mixing ratio kg/m 3
The analysis of the effects of the concrete before and after optimization is shown in the following table 3:
table 3 comparative table of concrete properties
As can be seen from the above tables 1, 2 and 3, the standard curing activities of the high-performance commercial concrete admixture 7d and 28d are higher than that of the dry mineral powder, after the high-performance commercial concrete admixture is used in the mixing station C30, the water consumption of single concrete is reduced by 10kg, the material cost is reduced by 6.1 yuan, the compressive strength of the concrete in each age is obviously improved, and particularly after 56d, the compressive strength of the concrete adopting the high-performance commercial concrete admixture still has a certain degree of increase, and the durability of the concrete adopting the high-performance commercial concrete admixture is obviously improved, so that the service life of the concrete can be greatly prolonged, and the high-performance commercial concrete admixture is beneficial to the construction engineering of century.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (9)
1. The superfine powder special for the commercial concrete is characterized by comprising the following raw materials in percentage by mass: 20 to 50 percent of superfine slag micropowder, 10 to 50 percent of superfine fly ash, 5 to 25 percent of silica fume, 5 to 25 percent of primary fly ash, 5 to 10 percent of high-calcium powder, 3 to 20 percent of gypsum, 5 to 25 percent of microbeads, 0.5 to 3 percent of grinding aid, 0.5 to 3 percent of exciting agent and 0.5 to 3 percent of powder water reducer.
2. The ultra-fine powder special for commercial concrete according to claim 1, wherein: the superfine slag micropowder is superfine powder, the particle size of the superfine slag micropowder is 5-30 um, and the specific surface area of the superfine slag micropowder is 400m 2 /g～1100m 2 /g。
3. A according to claim 1The superfine powder special for commercial concrete is characterized in that: the superfine fly ash is superfine powder, the grain diameter of the superfine fly ash is 1 um-20 um, and the specific surface area of the superfine fly ash is 500m 2 /g～1200m 2 /g。
4. The ultra-fine powder special for commercial concrete according to claim 1, wherein: the gypsum is selected from one or more of natural dihydrate gypsum, desulfurized gypsum, fluorine gypsum or phosphogypsum.
5. The ultra-fine powder special for commercial concrete according to claim 1, wherein: the grinding aid is selected from one or more of diethanolamine, triethanolamine or propanolamine.
6. The ultra-fine powder special for commercial concrete according to claim 1, wherein: the exciting agent is selected from one or more of sodium sulfate, sodium hydroxide, potassium sulfate, potassium hydroxide or slaked lime.
7. The ultra-fine powder special for commercial concrete according to claim 1, wherein: the powder water reducer is one or more selected from five-carbon polyether, six-carbon polyether or polyester.
8. The preparation method of the superfine powder special for the commercial concrete is applied to the method of claim 1, and is characterized by comprising the following steps:
step one: firstly, preparing enough slag raw materials according to actual preparation needs, then conveying the slag raw materials to a slag vertical mill for coarse grinding through metering conveying equipment, preparing slag micro powder, conveying the slag micro powder to an ultrafine grinding machine for grinding through the metering conveying equipment, and preparing the ultrafine slag micro powder with 1000-2500 meshes for later use;
step two: firstly, preparing enough raw fly ash according to actual preparation requirements, and then conveying the raw fly ash to an ultrafine pulverizer for pulverizing by metering conveying equipment to obtain ultrafine fly ash for later use;
step three: weighing 20-50% of superfine slag micropowder, 10-50% of ultrafine fly ash, 5-25% of silica fume, 5-25% of primary fly ash, 5-10% of high-calcium powder, 3-20% of gypsum, 5-25% of microbeads, 0.5-3% of grinding aid, 0.5-3% of exciting agent and 0.5-3% of powder water reducer as preparation raw materials by using the high-precision metering scale for standby in a batching warehouse;
step four: firstly, conveying the first-grade fly ash and the superfine fly ash prepared in the third step into a mixer for uniform stirring, and then sequentially adding superfine slag micropowder, silica fume, high-calcium powder, gypsum and microbeads into the mixer for continuous uniform mixing and stirring to prepare a primary mixture;
step five: and (3) after the preliminary mixture in the step (IV) is uniformly mixed, sequentially adding the grinding aid, the exciting agent and the powder water reducer into the preliminary mixture, continuously mixing and stirring, uniformly stirring to obtain superfine powder special for the commercial concrete, and packaging and warehousing.
9. The method for preparing the superfine powder special for the commercial concrete according to claim 8, which is characterized in that: the mixer is a mechanical and pneumatic conforming mixer, the mixing and stirring time of the primary fly ash and the superfine fly ash is 2-5 min, the mixing and stirring time of the superfine slag micropowder, the silica fume, the high-calcium powder, the gypsum and the microbeads is 3-5 min, and the mixing and stirring time of the grinding aid, the exciting agent and the powder water reducer is 3-5 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311208749.0A CN117263558A (en) | 2023-09-19 | 2023-09-19 | Superfine powder special for commercial concrete and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311208749.0A CN117263558A (en) | 2023-09-19 | 2023-09-19 | Superfine powder special for commercial concrete and preparation method thereof |
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| Publication Number | Publication Date |
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| CN117263558A true CN117263558A (en) | 2023-12-22 |
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| CN202311208749.0A Pending CN117263558A (en) | 2023-09-19 | 2023-09-19 | Superfine powder special for commercial concrete and preparation method thereof |
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| Country | Link |
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| CN (1) | CN117263558A (en) |
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2023
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