CN117263557A - Composite powder for mixing precast tubular pile concrete and preparation method thereof - Google Patents
Composite powder for mixing precast tubular pile concrete and preparation method thereof Download PDFInfo
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- CN117263557A CN117263557A CN202311208747.1A CN202311208747A CN117263557A CN 117263557 A CN117263557 A CN 117263557A CN 202311208747 A CN202311208747 A CN 202311208747A CN 117263557 A CN117263557 A CN 117263557A
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- 239000000843 powder Substances 0.000 title claims abstract description 66
- 239000004567 concrete Substances 0.000 title claims abstract description 57
- 238000002156 mixing Methods 0.000 title claims abstract description 50
- 239000002131 composite material Substances 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims description 12
- 239000010881 fly ash Substances 0.000 claims abstract description 51
- 238000000227 grinding Methods 0.000 claims abstract description 32
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 26
- 239000010440 gypsum Substances 0.000 claims abstract description 26
- 239000002893 slag Substances 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 12
- 239000011325 microbead Substances 0.000 claims abstract description 12
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 12
- 239000011575 calcium Substances 0.000 claims abstract description 11
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims description 17
- 238000003860 storage Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 7
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 6
- 229920000570 polyether Polymers 0.000 claims description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 5
- 239000011707 mineral Substances 0.000 claims description 5
- 235000010755 mineral Nutrition 0.000 claims description 5
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 4
- 235000011152 sodium sulphate Nutrition 0.000 claims description 4
- WUGQZFFCHPXWKQ-UHFFFAOYSA-N Propanolamine Chemical compound NCCCO WUGQZFFCHPXWKQ-UHFFFAOYSA-N 0.000 claims description 3
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 3
- 239000012752 auxiliary agent Substances 0.000 claims description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 3
- 239000000920 calcium hydroxide Substances 0.000 claims description 3
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims description 3
- 150000004683 dihydrates Chemical class 0.000 claims description 3
- 229920000728 polyester Polymers 0.000 claims description 3
- 235000011118 potassium hydroxide Nutrition 0.000 claims description 3
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 3
- 229910052925 anhydrite Inorganic materials 0.000 claims description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 2
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims description 2
- 229910052939 potassium sulfate Inorganic materials 0.000 claims description 2
- 235000011151 potassium sulphates Nutrition 0.000 claims description 2
- 239000004568 cement Substances 0.000 abstract description 7
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 2
- 239000000654 additive Substances 0.000 abstract description 2
- 238000003763 carbonization Methods 0.000 abstract description 2
- 238000011049 filling Methods 0.000 abstract description 2
- 230000008014 freezing Effects 0.000 abstract description 2
- 238000007710 freezing Methods 0.000 abstract description 2
- 238000005461 lubrication Methods 0.000 abstract description 2
- 239000011148 porous material Substances 0.000 abstract description 2
- 230000007704 transition Effects 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000004576 sand Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000004574 high-performance concrete Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000011513 prestressed concrete Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010884 boiler slag Substances 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004078 waterproofing Methods 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 composite powder for mixing precast tubular pile concrete, which comprises 20% -50% of slag micro powder, 10% -50% of 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 micro-beads, 0.5% -3% of grinding aid, 0.5% -3% of exciting agent and 0.5% -3% of water reducer; the superfine ground powder does not contain porous materials, has small fineness, can play roles of filling and ball lubrication in concrete, can greatly improve workability of fresh concrete while reducing water consumption of the concrete, improves the cross section transition structure of the concrete, obviously improves the chloride ion permeation resistance, freezing resistance, carbonization resistance and corrosion resistance of the concrete, has strong adaptability to cement and additives, greatly reduces cost, and can also prolong service life of the concrete.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to composite powder for mixing precast tubular pile concrete and a preparation method thereof.
Background
Along with the high-speed development of the technical level in the engineering construction field, the foundation treatment engineering construction process and mechanical equipment are continuously updated, and the role of the pipe pile in building construction is more and more important; the pipe pile is divided into a post-tensioning prestressed pipe pile and a pretensioning prestressed pipe pile, and the pipe pile is mainly subjected to axial stress in the process of beating or static pressure, so that the axial mechanical property of the pipe pile is particularly critical, the mechanical property of the existing pipe pile reaches the bottleneck, and the breakthrough is difficult to realize unless the material is broken through greatly.
At present, the method for treating the foundation of the strong prestressed concrete pipe pile is also widely and increasingly applied, especially in the foundation treatment of the high-rise residential engineering of larger cities, compared with the traditional foundation treatment methods (cast-in-place piles and CFDG piles), the method for treating the foundation of the strong prestressed concrete pipe pile has the advantages of high pile body strength, reliable quality, strong penetrating power, high single pile bearing capacity, convenience in construction, convenience in detection and the like, and has great popularization value.
The conventional admixture for the precast concrete pipe pile is mainly fly ash, slag micropowder, silica powder and microbeads, but the fly ash is difficult to purchase, the quality of the fly ash of a small power plant is unstable, so that the manufacturing cost is improved, in addition, as the environmental requirements are more and more strict, the heating path of the PHC precast pipe pile starts to be changed from coal burning to natural gas, so that a great amount of energy consumption and economic irrational are brought, the manufacturing cost is greatly improved, and the economic benefit is reduced;
in the existing concrete formula for the tubular piles, the sand rate is not ignored as an important parameter in the mixing proportion, the strength of the concrete is affected by the sand rate, the workability, the elastic modulus and the impact resistance of the concrete are also affected, the fluidity of the concrete can be increased by improving the sand rate, but the surface area of aggregate is increased, and the water consumption required for achieving the same slump is increased. Although the sand rate is too small, the strength of the concrete can be improved, the workability is deteriorated, the elastic modulus is changed greatly, meanwhile, the higher the strength of the concrete is, the higher the brittleness of the concrete is, the shock resistance is deteriorated, and in the present stage, most PHC pipe piles are applied by diesel hammers, the damage of the pipe piles is caused, and the contradiction in the prior art is difficult to solve, so the invention provides the composite powder for mixing the precast pipe pile concrete and the preparation method thereof, and solves the problems in the prior art.
Disclosure of Invention
Aiming at the problems, the invention aims to provide the composite powder for mixing the precast tubular pile concrete and the preparation method thereof, wherein the composite powder for mixing the precast tubular pile concrete and the preparation method can directly replace mineral powder or part of cement in cement and concrete by superfine grinding and sorting of industrial waste materials, effectively solve the problems of clinker price, mineral powder pretightness and high price, improve the comprehensive utilization rate of fly ash, reduce the carbon emission of industry and buildings, reduce the production cost of enterprises, simultaneously use the powder for high-strength concrete, greatly reduce the porosity, remarkably improve the corrosion resistance and durability, reduce the hydration heat of the concrete and reduce the cracking of the large-volume concrete.
In order to achieve the purpose of the invention, the invention is realized by the following technical scheme: the composite powder is prepared by mixing 20% -50% of slag micropowder, 10% -50% of 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 water reducer.
The further improvement is that: the composite powder comprises 35% of slag micropowder, 20% of fly ash, 10% of silica fume, 8% of primary fly ash, 6% of high-calcium powder, 8% of gypsum (including but not limited to natural dihydrate gypsum, desulfurized gypsum, fluorogypsum and phosphogypsum), 9% of microbeads, 1.5% of grinding aid (including but not limited to diethanolamine, triethanolamine and propanolamine), 1.5% of exciting agent (including but not limited to sodium sulfate, sodium hydroxide, sodium sulfate, potassium hydroxide and slaked lime) and 1% of water reducer (including but not limited to five-carbon polyether, six-carbon polyether and polyester).
The further improvement is that: the grain diameter of the slag micropowder is 5-30 mu m, and the specific surface area is 400m 2 /g-1100m 2 /g; the particle size of the fly ash is 1-20 mu m, and the specific surface area is 500m 2 /g-1200m 2 /g。
The further improvement is that: the gypsum is one or more of dihydrate gypsum, semi-hydrate gypsum and anhydrite.
The further improvement is that: the grinding aid is one or more of diethanolamine, triethanolamine and propanolamine.
The further improvement is that: the excitant is one or more of sodium sulfate, sodium hydroxide, potassium sulfate, potassium hydroxide and slaked lime.
The further improvement is that: the water reducer is one or more of five-carbon polyether, six-carbon polyether and polyester.
A preparation method of composite powder for mixing precast tubular pile concrete comprises the following steps:
firstly, slag is measured and conveyed to a slag vertical mill for coarse powder treatment, slag after coarse powder is differentiated and enters a storage warehouse, and is measured by a warehouse bottom measuring device and then is sent to superfine grinding to further fine powder of 1000-2500 meshes, and then is sent to a batching warehouse of a mixing system for storage;
step two, superfine grinding of the fly ash, namely conveying the fly ash to a superfine grinding batching warehouse, carrying out superfine grinding treatment on the fly ash by a metering device, and conveying the treated fly ash to a batching warehouse of a mixing and batching system for storage;
step three, preparing a batching warehouse, namely respectively storing silica fume, primary fly ash, high-calcium powder, gypsum, microbeads, grinding aid, exciting agent and water reducer in the batching warehouse of the mixing system for later use;
setting mixing data, namely setting raw material proportion, adding sequence and time in advance according to the requirement of a product formula, and mixing time data of each stage;
step five, carrying out batching conveying and stirring, namely firstly conveying the first-grade fly ash and ultrafine fly ash into a mechanical pneumatic compound mixer after metering, stirring to be uniform, and then sequentially adding ultrafine mineral powder, silica fume, high-calcium powder, gypsum and microbeads into the mixer for continuous stirring according to a set data program after metering by using a high-precision metering scale to obtain a premix;
step six, adding auxiliary agents for mixing, adding grinding aid, exciting agent and water reducer into a mixer for continuous stirring after all materials are uniformly mixed, and conveying the materials to a finished product warehouse for storage after all materials are uniformly mixed and reach the standard.
The further improvement is that: the mixing and stirring time of the first-stage fly ash and the ultrafine fly ash in the fifth step is 2-5 minutes, the mixing and stirring time of the second feeding is 3-5 minutes, and the mixing and stirring time in the sixth step is 3-5 minutes.
The beneficial effects of the invention are as follows: the superfine ground powder does not contain porous materials, has small fineness, can play roles of filling and ball lubrication in concrete, can greatly improve workability of fresh concrete while reducing water consumption of the concrete, improves the cross section transition structure of the concrete, obviously improves the chloride ion permeation resistance, freezing resistance, carbonization resistance and corrosion resistance of the concrete, has strong adaptability to cement and additives, greatly reduces cost, and can also prolong service life of the concrete.
Drawings
FIG. 1 is a flow chart of a method according to embodiment 2 of the present invention.
Detailed Description
The present invention will be further described in detail with reference to the following examples, which are only for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
Example 1
The embodiment provides a composite superfine powder for mixing precast tubular pile concrete, which is prepared by mixing 20% of ground modified slag powder, 10% of ground fly ash, 20% of silica fume, 10% of primary fly ash, 5% of high-calcium powder, 10% of gypsum, 20% of microbeads, 1% of grinding aid and 1% of water reducer of an exciting agent 3%.
The grain diameter of slag micropowder is 5-30 mu m, and the specific surface area is 900m 2 /kg; the particle size of the fly ash is 3-20 mu m, and the specific surface area is 1200m 2 /kg。
Example 2
According to the method for preparing the composite powder for mixing precast tubular pile concrete, shown in fig. 1, the method is characterized by comprising the following steps:
step one, conveying slag to a factory raw material workshop by a vehicle, adding the slag into a feed hopper by a loader, then metering and conveying the slag to the slag vertical mill for coarse powder treatment, enabling the slag subjected to coarse powder differentiation to enter a storage warehouse, metering the slag by a warehouse bottom metering device, conveying the slag into superfine grinding to further fine powder of 1000-2500 meshes, and conveying the slag into a batching warehouse of a blending system for later use;
step two, superfine grinding of the fly ash, namely conveying the fly ash to a superfine grinding batching warehouse by a tank truck, feeding the fly ash into superfine grinding by metering equipment, carrying out superfine grinding treatment on the fly ash, and conveying the treated fly ash to a batching warehouse of a mixing and batching system for storage;
step three, preparing a batching warehouse, namely respectively storing silica fume, primary fly ash, high-calcium powder, gypsum, microbeads, grinding aid, exciting agent and water reducer in the batching warehouse of the mixing system for later use;
setting mixing data, namely setting raw material proportion, adding sequence and time in advance according to the requirement of a product formula, and mixing time data of each stage;
step five, carrying out batching, namely firstly, metering 10% of primary fly ash and 10% of superfine fly ash, then conveying the materials into a mechanical pneumatic compound mixer, stirring for 2-5 minutes to be uniform, and then sequentially adding 20% of superfine mineral powder, 20% of silica fume, 5% of high-calcium powder, 10% of gypsum and 20% of microbeads into the mixer for continuous stirring for 3-5 minutes according to a set data program after metering by using a high-precision metering scale to obtain a premix;
step six, adding auxiliary agents for mixing, adding 1% of grinding aid, 1% of exciting agent and 3% of water reducer into a mixer for continuous stirring for 3-5 minutes after all materials are uniformly mixed, and conveying the materials to a finished product warehouse for storage after the materials are uniformly mixed and reach the standard.
The grain diameter of slag micropowder is 5-30 mu m, and the specific surface area is 400m 2 /g-1100m 2 /g; the particle size of the fly ash is 1-20 mu m, and the specific surface area is 500m 2 /g-1200m 2 /g。
The special powder for preparing the concrete is prepared according to the mass parts as the proportion, and can be increased or reduced according to the corresponding proportion during production, for example, the mass production can be carried out in kilograms or tons, the mass production can be carried out in grams, and the mass proportion among the components is unchanged.
Example 2
The preparation method of the composite powder for mixing the precast tubular pile concrete is characterized by comprising the following steps of:
s1: according to the proportion, 30% of ordinary Portland cement, 30% of fly ash, 20% of concrete professional composite powder, 2% of silica fume, 1% of grinding aid, 3% of quicklime, 2% of desulfurized gypsum, 5% of waterproofing agent, 5% of powder water reducer and 2% of polypropylene fiber, and the balance of water are accurately weighed, and then the cement and the gypsum are conveyed into a roller press through a conveying system and are crushed under the action of mutually extruded compression rollers. The clinker and the gypsum are precisely weighed by a belt scale, and the composite fly ash and the grinding aid are precisely weighed by a meter.
S2: and conveying the composite fly ash, the grinding aid and the crushed clinker and gypsum to a ball mill for mixing to obtain a special powder finished product of the concrete.
S3: and conveying the concrete special powder finished product to a finished product bin for storage through a winch conveying assembly and a lifting machine.
In addition, the special powder for concrete prepared in the embodiment is used in the preparation process of high-performance concrete; wherein, the raw materials of concrete are as follows: 50% of the concrete special powder, 20% of cement and 30% of water.
Example 3
The preparation method of the composite powder for mixing the precast tubular pile concrete is characterized by comprising the following steps of:
s1: the clinker and the gypsum are conveyed into a roller press through a conveying system and are crushed under the action of mutually extruded press rollers. The method comprises the steps of accurately weighing clinker and gypsum by adopting a belt scale, and accurately weighing composite fly ash and grinding aid by adopting a meter;
the raw material components of the composite fly ash comprise, by percentage, 60% of dolomite, 4% of lime mud, 18% of power plant slag, 5% of fly ash, 5% of boiler slag and 6% of waste brick slag.
S2: and conveying the composite fly ash, the grinding aid and the crushed clinker and gypsum to a ball mill for mixing to obtain a special powder finished product of the concrete.
S3: and conveying the concrete special powder finished product to a finished product bin for storage through a winch conveying assembly and a lifting machine.
In addition, the special powder for concrete prepared in the embodiment is used in the preparation process of high-performance concrete; wherein, the raw materials of concrete are calculated according to the weight portion: 55% of the concrete special powder, 20% of cement and 25% of water.
In addition, in order to better evaluate the properties of the concrete prepared in example 2 and example 3, the following experiments were performed, and specific data are shown in tables 1 and 2.
Table 1 table of performance data of concrete of example before and after adding ultrafine powder
Table 2 table of mixed concrete performance data for example 2 and example 3
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The composite powder for mixing precast tubular pile concrete is characterized in that: the composite powder is prepared by mixing 20% -50% of slag micropowder, 10% -50% of 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 water reducer.
2. The composite powder for mixing precast tubular pile concrete according to claim 1, wherein: the grain diameter of the slag micropowder is 5-30 mu m, and the specific surface area is 400m 2 /g-1100m 2 /g; the particle size of the fly ash is 1-20 mu m, and the specific surface area is 500m 2 /g-1200m 2 /g。
3. The composite powder for mixing precast tubular pile concrete according to claim 1, wherein: the gypsum is one or more of dihydrate gypsum, semi-hydrate gypsum and anhydrite.
4. The composite powder for mixing precast tubular pile concrete according to claim 1, wherein: the grinding aid is one or more of diethanolamine, triethanolamine and propanolamine.
5. The composite powder for mixing precast tubular pile concrete according to claim 1, wherein: the excitant is one or more of sodium sulfate, sodium hydroxide, potassium sulfate, potassium hydroxide and slaked lime.
6. The composite powder for mixing precast tubular pile concrete according to claim 1, wherein: the water reducer is one or more of five-carbon polyether, six-carbon polyether and polyester.
7. The preparation method of the composite powder for mixing the precast tubular pile concrete is characterized by comprising the following steps of:
firstly, slag is measured and conveyed to a slag vertical mill for coarse powder treatment, slag after coarse powder is differentiated and enters a storage warehouse, and is measured by a warehouse bottom measuring device and then is sent to superfine grinding to further fine powder of 1000-2500 meshes, and then is sent to a batching warehouse of a mixing system for storage;
step two, superfine grinding of the fly ash, namely conveying the fly ash to a superfine grinding batching warehouse, carrying out superfine grinding treatment on the fly ash by a metering device, and conveying the treated fly ash to a batching warehouse of a mixing and batching system for storage;
step three, preparing a batching warehouse, namely respectively storing silica fume, primary fly ash, high-calcium powder, gypsum, microbeads, grinding aid, exciting agent and water reducer in the batching warehouse of the mixing system for later use;
setting mixing data, namely setting raw material proportion, adding sequence and time in advance according to the requirement of a product formula, and mixing time data of each stage;
step five, carrying out batching conveying and stirring, namely firstly conveying the first-grade fly ash and ultrafine fly ash into a mechanical pneumatic compound mixer after metering, stirring to be uniform, and then sequentially adding ultrafine mineral powder, silica fume, high-calcium powder, gypsum and microbeads into the mixer for continuous stirring according to a set data program after metering by using a high-precision metering scale to obtain a premix;
step six, adding auxiliary agents for mixing, adding grinding aid, exciting agent and water reducer into a mixer for continuous stirring after all materials are uniformly mixed, and conveying the materials to a finished product warehouse for storage after all materials are uniformly mixed and reach the standard.
8. The method for preparing the composite powder for mixing the precast tubular pile concrete according to claim 7, which is characterized in that: the mixing and stirring time of the first-stage fly ash and the ultrafine fly ash in the fifth step is 2-5 minutes, the mixing and stirring time of the second feeding is 3-5 minutes, and the mixing and stirring time in the sixth step is 3-5 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311208747.1A CN117263557A (en) | 2023-09-19 | 2023-09-19 | Composite powder for mixing precast tubular pile concrete and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311208747.1A CN117263557A (en) | 2023-09-19 | 2023-09-19 | Composite powder for mixing precast tubular pile concrete and preparation method thereof |
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