CN113213802A - High-performance concrete admixture and production method thereof - Google Patents
High-performance concrete admixture and production method thereof Download PDFInfo
- Publication number
- CN113213802A CN113213802A CN202110503909.9A CN202110503909A CN113213802A CN 113213802 A CN113213802 A CN 113213802A CN 202110503909 A CN202110503909 A CN 202110503909A CN 113213802 A CN113213802 A CN 113213802A
- Authority
- CN
- China
- Prior art keywords
- bin
- grinding
- concrete admixture
- percent
- equal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 239000004574 high-performance concrete Substances 0.000 title claims abstract description 20
- 239000004567 concrete Substances 0.000 claims abstract description 57
- 230000000694 effects Effects 0.000 claims abstract description 47
- 239000002893 slag Substances 0.000 claims abstract description 33
- 239000010440 gypsum Substances 0.000 claims abstract description 24
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 24
- 239000010881 fly ash Substances 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 239000002910 solid waste Substances 0.000 claims abstract description 8
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims abstract description 7
- 238000000227 grinding Methods 0.000 claims description 75
- 239000000463 material Substances 0.000 claims description 59
- 239000002245 particle Substances 0.000 claims description 49
- 239000000843 powder Substances 0.000 claims description 30
- 229910000831 Steel Inorganic materials 0.000 claims description 23
- 239000010959 steel Substances 0.000 claims description 23
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 15
- 238000005192 partition Methods 0.000 claims description 15
- 238000012216 screening Methods 0.000 claims description 15
- 239000002131 composite material Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000007599 discharging Methods 0.000 claims description 10
- 238000005054 agglomeration Methods 0.000 claims description 9
- 230000002776 aggregation Effects 0.000 claims description 9
- 238000005242 forging Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 230000003068 static effect Effects 0.000 claims description 8
- 238000003860 storage Methods 0.000 claims description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
- 229910052593 corundum Inorganic materials 0.000 claims description 6
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 5
- 238000011049 filling Methods 0.000 claims description 5
- 239000011149 active material Substances 0.000 claims description 4
- 229910052681 coesite Inorganic materials 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- 229910052906 cristobalite Inorganic materials 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 4
- 230000008030 elimination Effects 0.000 claims description 4
- 238000003379 elimination reaction Methods 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 238000003892 spreading Methods 0.000 claims description 4
- 230000007480 spreading Effects 0.000 claims description 4
- 229910052682 stishovite Inorganic materials 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 229910052905 tridymite Inorganic materials 0.000 claims description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- 229910000617 Mangalloy Inorganic materials 0.000 claims description 3
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 10
- 239000000126 substance Substances 0.000 abstract description 10
- 239000000654 additive Substances 0.000 abstract description 7
- 229910021487 silica fume Inorganic materials 0.000 abstract description 7
- 230000004913 activation Effects 0.000 abstract description 5
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 240000007594 Oryza sativa Species 0.000 abstract description 2
- 235000007164 Oryza sativa Nutrition 0.000 abstract description 2
- 239000002956 ash Substances 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 abstract description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 abstract description 2
- 235000009566 rice Nutrition 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- 239000004568 cement Substances 0.000 description 24
- 229910052500 inorganic mineral Inorganic materials 0.000 description 12
- 239000011707 mineral Substances 0.000 description 12
- 235000010755 mineral Nutrition 0.000 description 12
- 238000010025 steaming Methods 0.000 description 9
- 239000006004 Quartz sand Substances 0.000 description 7
- 238000010276 construction Methods 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 6
- 239000012190 activator Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 2
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 235000011116 calcium hydroxide Nutrition 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 239000006259 organic additive Substances 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction 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
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 relates to an improvement of concrete admixture production technology, in particular to a high-performance concrete admixture and a production method thereof, which can realize wide range of applicable raw materials, adopts physical ultrafine activation to replace chemical additives to excite and activate the high-activity concrete admixture and the production method thereof, solves the problems mentioned in the background technology, and comprises the following components in percentage by mass: 30-70% of fly ash, slag micropowder: 20% -50%, functional excitant: 5% -30%; wherein the functional excitant is prepared by mixing one or more than two of natural gypsum, desulfurized gypsum and phosphogypsum in any proportion; SO in the natural gypsum, the desulfurized gypsum and the phosphogypsum3The content is more than or equal to 40 percent; the adopted raw materials are simple and low in price, and most of high-activity concrete admixtures need to be doped with raw materials with high activity and high price, such as silica fume, metakaolin, rice hull ash and the like. Meanwhile, under different application conditions, a large amount of solid waste can be adopted, so that waste can be changed into valuable, and the problem of environmental pollution can be relieved.
Description
Technical Field
The invention relates to an improvement of a concrete admixture production technology, in particular to a high-performance concrete admixture and a production method thereof.
Background
At present, concrete mineral admixtures are adopted in concrete production enterprises at present to adjust concrete components, and due to the deterioration of raw materials, the characteristics of materials and the like in recent years, when a concrete product uses the composite admixtures, abnormal conditions such as increase of comprehensive water demand, increase of concrete water-cement ratio, reduction of construction performance, difficulty in guaranteeing of active strength and the like often occur, so that the quality control of products such as concrete is difficult, and great risks exist in the service life of building structures. The use effect is not absolutely broken through due to the defects of high use cost, unstable effect, multiple quality hidden dangers, large pollution risk and the like when the organic additive is adjusted by the organic additive technology.
At present, mineral admixture becomes one of essential components of high-performance concrete. It is even thought that the development and utilization of some chemical admixtures are promoted and the concept of high-performance concrete is also promoted by researchers due to the development of mineral admixtures. The existing common mineral admixtures comprise fly ash, blast furnace slag, silica fume and the like, the untreated admixtures are often low in activity and cannot effectively improve the early strength of concrete, on one hand, the high-activity silica fume can be added to increase the early strength of the concrete, but the cost of the silica fume is high, the fluidity of the concrete can be reduced when the silica fume is excessively added, on the other hand, chemical additives can be added to excite the activity of the silica fume, and the later-stage durability of the concrete is greatly reduced.
At present, Chinese patent CN201911379597.4 discloses a modified production preparation method of a composite mineral admixture, which adopts the following steps: 35-40 parts of slag powder grinding material, 35-40 parts of fly ash, 2-3 parts of desulfurized gypsum, 8-10 parts of steel slag, 8-10 parts of zeolite ore, 0.5-1.0 part of powdery polycarboxylic acid water reducing agent, 1.0 part of limestone powder and 0.5 part of hydrated lime. The slag powder grinding material has the characteristics that: 45 micron of fineness of screen residue is less than or equal to 2 percent, and the specific surface area is more than or equal to 400m2The activity is more than or equal to 75 percent in 7 days, the activity is more than or equal to 95 percent in 28 days, and the content of chloride ions is less than or equal to 0.06 percent. The characteristics of the fly ash are as follows: the ignition loss is less than or equal to 5 percent, the fineness of 45-micron screen residue is less than or equal to 20 percent, the activity in 7 days is more than or equal to 60 percent, the activity in 28 days is more than or equal to 80 percent, and the content of chloride ions is less than or equal to 0.06 percent.
The method comprises the following steps of: according to the weight ratio, 35-40 parts of slag grinding material, 35-40 parts of fly ash, 2-3 parts of desulfurized gypsum and 8-10 parts of steel slag are taken as active materials after being ground, 8-10 parts of zeolite ore are taken as filling materials after being ground and modified, 0.5-1.0 part of powdery polycarboxylic acid water reducing agent, 1.0 part of limestone powder and 0.5 part of hydrated lime are respectively conveyed into a large storage bin for standby by utilizing a flow pump of the weighed materials, the storage bin adopts a fluidized blanking principle, and the smooth blanking and the uniform blanking are realized in the bin by adopting a guide cone process; the production ratio is set up in the automatic batching system, various raw materials realize the common blanking under the unified command of the automatic batching system of the computer, various supplies are measured accurately through the reamer electronic scale, realize the continuous accurate blanking, form the synchronous compound batching, the compound supplies are conveyed through the chute and enter the double-shaft mixer before grinding together, pass 1% of automatic metering water distribution at the mixer first, pass the mixer and stir by force, realize the most possible and break up, mix, cool the integrated operation, convey and enter the mill through the stirring leaf finally;
3) the grinding mill is further uniformly stirred and ground by an ultra-small round special grinding body, the best impact grinding effect is achieved by ball throwing collision through a gully reverse groove lining plate, meanwhile, the forward feeding of materials can be achieved through a special arrangement structure of the reverse groove lining plate, the material conveying speed can be controlled, and the grinding effect which is most reasonable in control of fineness and specific surface is achieved;
4) the composite material is subjected to superfine grinding in the mill and is milled in a high-temperature agglomeration state, the material is conveyed into a double-shaft mixer with a separately arranged mill tail through a mill tail chute, the material is scattered at a high speed in the mixer, cooled and uniformly mixed to achieve the condition of being discharged, and meanwhile, the material is subjected to static electricity removal treatment by utilizing the stirring and cooling, so that the agglomeration phenomenon of the material is thoroughly eliminated;
5) the materials stirred by the tail grinding double-shaft stirrer enter the high-efficiency powder concentrator through an air conveying chute, the materials are sorted by using a winnowing principle, and are screened by vibration, so that qualified particles and unqualified particles are effectively distinguished, and the unqualified particles are sorted out and are re-stirred, uniformly mixed and ground again by the stirrer before being re-ground through an air conveying pipeline by the discharging device;
6) qualified particles enter a warehousing chute to realize further uniform mixing and static elimination, finally qualified materials are lifted to the top of a finished product warehouse through a lifter, the qualified materials are thrown into a finished product warehouse through a spreading disc, the finished product materials can be dispersed and delivered out of a factory to enter a concrete powder warehouse after standing for more than 8 hours, and the produced product is an ultrafine material with the fineness of 30 microns being less than 1.0 percent, the specific surface area being more than 730m2/Kg and the particle distribution being less than 3 microns being more than 18 percent.
Although the method can not adopt a chemical additive mode to excite the activity of the mineral admixture, the application range of the mineral admixture and the raw materials is greatly limited due to the difference of the grindability of different raw materials and the single characterization technology of the ground material, the problem of grinding agglomeration cannot be solved by adopting the process and the proportion, and the application range of the mineral admixture and the raw materials is greatly limited due to the limitation of grinding equipment.
Disclosure of Invention
Aiming at the problems mentioned in the background technology, the invention aims to provide a high-performance concrete admixture and a production method thereof, which can realize wide range of applicable raw materials, and adopt physical ultrafine activation to replace chemical additives to excite and activate the high-activity concrete admixture so as to solve the problems mentioned in the background technology.
The technical purpose of the invention is realized by the following technical scheme: the high-performance concrete admixture is characterized by comprising the following components in percentage by mass: 30-70% of fly ash, slag micropowder: 20% -50%, functional excitant: 5% -30%;
wherein the functional excitant is obtained by mixing one or more than two of natural gypsum, desulfurized gypsum and phosphogypsum in any proportion; SO in the natural gypsum, the desulfurized gypsum and the phosphogypsum3The content is more than or equal to 40 percent.
Preferably, the fly ash and the slag micropowder can also adopt SiO2、Al2O3And CaO as the main component.
Preferably, SiO in the solid waste2+Al2O3The content of CaO is more than or equal to 70 percent.
Preferably, the solid waste can be nickel slag, lithium slag or steel slag.
Preferably, the specific surface area of the high-activity concrete admixture is more than or equal to 650m2Kg, and the content of particles smaller than 10 μm is more than or equal to 50 percentThe content of particles larger than 45 mu m is less than or equal to 5 percent.
The technical purpose of the invention is realized by the following technical scheme: a production method of a high-performance concrete admixture comprises the following steps: step one, taking 30-70 parts of fly ash and 20-50 parts of slag micro powder according to the weight ratio, and grinding the fly ash and the slag micro powder to be used as active materials;
one or more than two of natural gypsum, desulfurized gypsum and phosphogypsum are mixed in any proportion to be used as a functional excitant, and 5-30 parts of the functional excitant are taken;
step two, conveying the weighed materials into a large storage bin for later use by utilizing a flow pump of the weighed materials, wherein the storage bin adopts a fluidized blanking principle, and a guide cone process is adopted in the bin to realize smooth blanking and uniform blanking; the production ratio is set after the automatic batching system, various raw materials are jointly fed under the unified command of the computer automatic batching system, various materials are accurately metered by the reamer electronic scale to realize continuous and accurate feeding to form synchronous composite batching, the composite materials are conveyed by the chute to jointly enter the double-shaft mixer before grinding, 1 percent of automatic metering water distribution is firstly carried out on the mixer, forced stirring is carried out by the mixer to realize the most possible integrated operation of scattering, uniformly mixing and cooling, and finally the materials are conveyed into the grinding machine by the stirring blades;
step three: the materials enter the rotary device through the feeding device for grinding, and pass through the discharging device after grinding is finished;
the grinding machine barrel is divided into three bins, wherein one bin is a coarse grinding bin, the second bin is a transition bin, and the third bin is a fine grinding bin; grinding bodies with different sizes are arranged in each bin;
the special grinding machine for ultrafine powder is characterized in that a double-layer partition plate is arranged between a first bin and a second bin in a barrel of the special grinding machine for ultrafine powder, a screening bin type screening partition device is arranged between the second bin and the third bin, the screening bin type screening partition device consists of a feeding grid plate, a discharging grid plate, a screen plate, a partition frame, a lifting plate and a bidirectional discharge cone, the lifting plate is fixed on the partition frame through bolts, and the feeding grid plate and the screen plate are separated by 5cm during installation to form a screening bin;
step four: the grinding mill is further uniformly stirred and ground by an ultra-small round special grinding body, the best impact grinding effect is achieved by ball throwing collision through a gully inverted groove lining plate, meanwhile, the forward feeding of materials can be achieved through the special arrangement structure of the lining plate, the material conveying speed can be controlled, and the grinding effect with the most reasonable fineness and ratio can be achieved;
step five: the composite material is subjected to superfine grinding in the mill and is milled in a high-temperature agglomeration state, the material is conveyed into a double-shaft mixer with a separately arranged mill tail by a mill tail chute, the material is scattered at a high speed in the mixer, cooled and uniformly mixed to achieve the condition of being discharged, and meanwhile, the material is subjected to static electricity removal treatment by humidifying and cooling, so that the agglomeration phenomenon of the material is thoroughly eliminated;
step six: the materials stirred by the tail grinding double-shaft stirrer enter the high-efficiency powder concentrator through an air conveying chute, the materials are sorted by using a winnowing principle, and are screened by vibration, so that qualified particles and unqualified particles are effectively distinguished, and the unqualified particles are sorted out and are re-stirred, uniformly mixed and ground again by the stirrer before being re-ground through an air conveying pipeline by the discharging device;
step seven: qualified particles enter a warehousing chute to realize further uniform mixing and static elimination, finally, qualified materials are lifted to the top of a finished product warehouse by a lifter and are thrown into the finished product warehouse by a spreading disc, and the produced product has a specific surface area of more than or equal to 650m2The content of particles with the particle size of more than or equal to 50 percent per kg and less than 10 mu m and the content of particles with the particle size of more than 45 mu m is less than or equal to 5 percent.
Preferably, the lining plate adopted in the mill cylinder is made of manganese steel, and a plurality of small lining plate units are spliced and annularly arranged on the inner surface of the roller.
Preferably, the special mill for ultrafine powder is characterized in that a large-wave-shaped corrugated lining plate with relatively outstanding wave forms is adopted in one bin of a mill cylinder, small-wave-shaped corrugated lining plates with relatively gentle wave forms are adopted in two bins and three bins, and activated lining plates are adopted in the three bins at intervals of 5 rings to replace the small-wave-shaped lining plates.
Preferably, the grinding bodies in each bin in the third step adopt micro steel balls, micro steel forgings or a mixture of the micro steel balls and the micro steel forgings, the diameter of the adopted steel balls or the steel forgings is from phi 40mm to phi 4.1mm, the diameters of the grinding bodies in the first bin, the second bin and the third bin are sequentially reduced, and the filling rate is gradually increased in a step manner.
In summary, the invention mainly has the following beneficial effects: the high-performance concrete admixture and the production method thereof have the advantages that the adopted raw materials are simple and low in price, and most of the high-activity concrete admixtures need to be mixed with raw materials with high activity and high price, such as silica fume, metakaolin, rice hull ash and the like. Meanwhile, under different application conditions, a large amount of solid waste can be adopted, so that waste can be changed into valuable, and the problem of environmental pollution can be relieved.
Chemical additives are not required to be doped in the mixture ratio, and physical ultrafine activation is adopted to replace chemical additives to activate, so that the side effects brought by chemical products are reduced.
The existing concrete admixture technology mainly adopts specific surface area to represent the grinding fineness, but the quality of the concrete admixture cannot be effectively represented by singly adopting the specific surface area due to different grinding easiness of different raw materials. The proportion adopted by the invention is that the specific surface area is controlled to be more than or equal to 650m2While controlling the content of particles smaller than 10 mu m to be more than or equal to 50 percent and the content of particles larger than 45 mu m to be less than or equal to 5 percent.
The content of particles smaller than 10 mu m is in direct proportion to the activity of the pozzolan, and the more fine particles, the more uniform and effective the filling of the particles into gaps of cement particles can be realized, the water bleeding channel in concrete is blocked, the water bleeding is reduced, the more liquid flowing in a slurry can be reduced, the cohesiveness of a mixture is increased, and the working performance and the mechanical performance of the concrete are greatly improved; whereas particles larger than 45 μm have substantially no pozzolanic activity.
The invention has wide application range, can be suitable for steam-curing concrete prefabricated parts at the temperature of 30-90 ℃, and greatly improves the activity of the admixture under the condition of normal-pressure steam curing under the composite excitation condition of high temperature and sulfate when used in the PHC tubular pile, so the admixture can avoid the high-pressure steam curing link in the traditional process, can meet the strength requirement under the condition of normal-pressure high-temperature (70-90 ℃) steam curing, greatly improves the production benefit of the tubular pile enterprise, reduces the manufacturing cost and reduces the environmental pollution;
when the admixture is used in a prefabricated member steamed at a medium and low temperature (30-60 ℃), the admixture can replace cement with a large amount of admixture, and improves the mechanical property and the working performance of the concrete.
When the admixture is used in commercial concrete, because the particles of the admixture are fine, the micro particles can uniformly fill gaps between the admixture and cement particles, the grading of a gelled system is improved from microcosmic, the compactness is improved, and the mechanical property of the concrete is greatly improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The high-performance concrete admixture comprises the following components in percentage by mass: 30-70% of fly ash, slag micropowder: 20% -50%, functional excitant: 5% -30%;
wherein the functional excitant is obtained by mixing one or more than two of natural gypsum, desulfurized gypsum and phosphogypsum in any proportion; SO in the natural gypsum, the desulfurized gypsum and the phosphogypsum3The content is more than or equal to 40 percent.
The fly ash and the slag micropowder can also adopt SiO2、Al2O3And CaO as the main component.
SiO in the solid waste2+Al2O3The content of CaO is more than or equal to 70 percent.
The solid waste can be nickel slag, furnace slag, lithium slag or steel slag.
The specific surface area of the high-activity concrete admixture is more than or equal to 650m2Kg, and the content of particles smaller than 10 mu m is more than or equal to 50 percent, and the content of particles larger than 45 mu m is less than or equal to 5 percent.
A production method of a high-performance concrete admixture comprises the following steps: step one, taking 30-70 parts of fly ash and 20-50 parts of slag micro powder according to the weight ratio, and grinding the fly ash and the slag micro powder to be used as active materials;
one or more than two of natural gypsum, desulfurized gypsum and phosphogypsum are mixed in any proportion to be used as a functional excitant, and 5-30 parts of the functional excitant are taken;
step two, conveying the weighed materials into a large storage bin for later use by utilizing a flow pump of the weighed materials, wherein the storage bin adopts a fluidized blanking principle, and a guide cone process is adopted in the bin to realize smooth blanking and uniform blanking; the production ratio is set after the automatic batching system, various raw materials are jointly fed under the unified command of the computer automatic batching system, various materials are accurately metered by the reamer electronic scale to realize continuous and accurate feeding to form synchronous composite batching, the composite materials are conveyed by the chute to jointly enter the double-shaft mixer before grinding, 1 percent of automatic metering water distribution is firstly carried out on the mixer, forced stirring is carried out by the mixer to realize the most possible integrated operation of scattering, uniformly mixing and cooling, and finally the materials are conveyed into the grinding machine by the stirring blades;
step three: the materials enter the rotary device through the feeding device for grinding, and pass through the discharging device after grinding is finished;
the grinding machine barrel is divided into three bins, wherein one bin is a coarse grinding bin, the second bin is a transition bin, and the third bin is a fine grinding bin; grinding bodies with different sizes are arranged in each bin;
the special grinding machine for ultrafine powder is characterized in that a double-layer partition plate is arranged between a first bin and a second bin in a barrel of the special grinding machine for ultrafine powder, a screening bin type screening partition device is arranged between the second bin and the third bin, the screening bin type screening partition device consists of a feeding grid plate, a discharging grid plate, a screen plate, a partition frame, a lifting plate and a bidirectional discharge cone, the lifting plate is fixed on the partition frame through bolts, and the feeding grid plate and the screen plate are separated by 5cm during installation to form a screening bin;
step four: the grinding mill is further uniformly stirred and ground by an ultra-small round special grinding body, the best impact grinding effect is achieved by ball throwing collision through a gully inverted groove lining plate, meanwhile, the forward feeding of materials can be achieved through the special arrangement structure of the lining plate, the material conveying speed can be controlled, and the grinding effect with the most reasonable fineness and ratio can be achieved;
step five: the composite material is subjected to superfine grinding in the mill and is milled in a high-temperature agglomeration state, the material is conveyed into a double-shaft mixer with a separately arranged mill tail by a mill tail chute, the material is scattered at a high speed in the mixer, cooled and uniformly mixed to achieve the condition of being discharged, and meanwhile, the material is subjected to static electricity removal treatment by humidifying and cooling, so that the agglomeration phenomenon of the material is thoroughly eliminated;
step six: the materials stirred by the tail grinding double-shaft stirrer enter the high-efficiency powder concentrator through an air conveying chute, the materials are sorted by using a winnowing principle, and are screened by vibration, so that qualified particles and unqualified particles are effectively distinguished, and the unqualified particles are sorted out and are re-stirred, uniformly mixed and ground again by the stirrer before being re-ground through an air conveying pipeline by the discharging device;
step seven: qualified particles enter a warehousing chute to realize further uniform mixing and static elimination, finally, qualified materials are lifted to the top of a finished product warehouse by a lifter and are thrown into the finished product warehouse by a spreading disc, and the produced product has a specific surface area of more than or equal to 650m2The content of particles with the particle size of more than or equal to 50 percent per kg and less than 10 mu m and the content of particles with the particle size of more than 45 mu m is less than or equal to 5 percent.
The lining plate is made of manganese steel and is arranged in the mill cylinder, and a plurality of small lining plate units are spliced to be annularly arranged on the inner surface of the roller.
The special mill for the ultrafine powder is characterized in that a large-wave-shaped corrugated lining plate with relatively outstanding wave forms is adopted in a first bin of a mill cylinder, small-wave-shaped corrugated lining plates with relatively gentle wave forms are adopted in a second bin and a third bin, and an activated lining plate is adopted in the third bin for replacing the small-wave-shaped lining plates every 5 rings.
And the grinding bodies in each bin in the third step adopt micro steel balls and micro steel forgings or the mixture of the micro steel balls and the micro steel forgings, the diameter of the adopted steel balls or the steel forgings is from phi 40mm to phi 4.1mm, the diameters of the grinding bodies in the first bin, the second bin and the third bin are sequentially reduced, and the filling rate is gradually increased in a step manner.
Implementation 1:
the high-activity concrete admixture is applied to the C80PHC pipe pile;
the raw material ratio is as follows: 55% of fly ash and slag micropowder by mass percent: 30%, functional activator: 15 percent; accurately weighing the components, and adopting the high-efficiency grinding technology to grind until the specific surface area is more than or equal to 650m2Per kg, the content of particles smaller than 10 mu m is more than or equal to 50 percent, and the content of particles larger than 45 mu m is less than or equal to 5 percent, thus obtaining the high-activity concrete admixture.
The prepared high-activity concrete admixture is used for replacing cement by 30 percent of equal mass to form a 100X 100mm sample for testing according to the standard of the test method for the mechanical property of common concrete (GB/T50081-2002) and the standard of the Chinese society of civil engineering (CCES 2004-01). The maintenance system is as follows: standing for 4h after molding, and steaming at 90 deg.C for 6 h. For comparison, a comparison test is carried out by adopting a traditional process, the traditional process adopts ground quartz sand and mineral powder to replace cement by 30 percent of equal mass, and the maintenance system is as follows: standing for 4 hr after molding, steaming at 90 deg.C for 6 hr, and steaming under high pressure for 5 hr (180 deg.C, 1.0MPa)
TABLE 1C 80PHC tubular pile concrete mixing ratio/kg/m3
Note: the cement is a P.II 52.5 cement
TABLE 2C 80PHC tubular pile concrete strength/MPa
| Numbering | Strength after steaming for 6h | Strength after steaming and pressing for 5h |
| 1 | 65.8 | 75 |
| 2 | 82.8 | 118 |
| 3 | 59.6 | 81.8 |
| 4 | 68.7 | 89.7 |
Experimental results show that ground quartz sand is adopted to replace cement in the traditional process, the strength of the ground quartz sand is lower than that of pure cement after the ground quartz sand is steamed for 6 hours, the strength of the ground quartz sand is only about 3MPa higher than that of the pure cement after the ground quartz sand is steamed for 6 hours, and the strength requirement of the C80PHC pipe pile can be met after the ground quartz sand and the pure cement are continuously steamed for 5 hours under the high-pressure steaming condition. The strength of the admixture can reach 82.8MPa after being steamed for 6 hours, the production of the C80PHC tubular pile is completely met, and the strength can reach more than 110MPa after being further steamed for 4 hours. By adopting the admixture, 1/3 time can be saved in one production cycle of the tubular pile; higher strength can be achieved if conventional production flow is used.
Implementation 2:
the high-activity concrete admixture is applied to C55 pipe piece concrete;
the raw material ratio is as follows: 24% of fly ash and slag micropowder by mass percent: 56%, functional activator: 20 percent; accurately weighing the components, and grinding to specific ratio by adopting the high-efficiency grinding technologyThe surface area is more than or equal to 650m2Per kg, the content of particles smaller than 10 mu m is more than or equal to 50 percent, and the content of particles larger than 45 mu m is less than or equal to 5 percent, thus obtaining the high-activity concrete admixture;
the prepared high-activity concrete admixture is used for replacing cement by 45 percent of equal mass to form a 100X 100mm sample for testing according to the standard of the test method for the mechanical property of common concrete (GB/T50081-2002) and the standard of the Chinese society of civil engineering (CCES 2004-01). The maintenance system is as follows: standing for 4h after molding, steaming at 60 deg.C for 4h, naturally cooling to room temperature, transferring into water, and standard curing for 28 d.
TABLE 3C 55 mix ratio of segment concrete/kg/m3
Note: the cement is P.O 52.5 cement
TABLE 4C 55 segment concrete Strength/MPa
| Numbering | Slump/mm | Strength after steaming for 4h | 28d strength |
| 1 | 120 | 25.1 | 59.8 |
| 2 | 180 | 34.7 | 65.5 |
The experimental result shows that the admixture of the invention replaces 45 percent of cement, and the water consumption is less than 22kg/m when being compared with pure cement3Under the condition, the slump is obviously greater than that of a pure cement sample, the working performance of the concrete prepared by the admixture is obviously improved, and the concrete is easier to fill grinding tools and wrap reinforcing steel bars, so that the construction efficiency is improved, the construction strength is reduced, the energy consumption is reduced, the construction quality is improved, the construction period is shortened, and the construction speed is accelerated. Meanwhile, the strength of the admixture of the invention after being steamed for 4h and 28d is obviously better than that of a pure cement sample.
Implementation 3:
the high-efficiency concrete admixture is applied to C30 commercial concrete;
the raw material ratio is as follows: 70% of fly ash and slag micropowder by mass percent: 12%, functional activator: 18 percent; accurately weighing the components, and adopting the high-efficiency grinding technology to grind until the specific surface area is more than or equal to 650m2Per kg, the content of particles smaller than 10 mu m is more than or equal to 50 percent, and the content of particles larger than 45 mu m is less than or equal to 5 percent, thus obtaining the high-activity concrete admixture.
The prepared high-activity concrete admixture replaces all mineral powder and is tested according to the standard of the test method for mechanical property of common concrete (GB/T50081-2002) and the standard of the Chinese society for civil engineering (CCES2004-01) to form a sample with the size of 100 multiplied by 100 mm. The maintenance system is as follows: and standard curing is carried out to 7d and 28d after forming.
TABLE 5C 30 commercial concrete mixing ratio/kg/m3
Note: the cement is conch P.O 42.5 cement
TABLE 6C 30 commercial concrete Properties
Experimental results show that the admixture of the invention is used for replacing mineral powder in C30 commercial concrete, the 7d compressive strength is about 5MPa higher than that of the standard concrete, the 28d compressive strength is 7MPa higher than that of the standard concrete, and the 90d shrinkage strain is 320 multiplied by 10-6Reduced to 210 × 10-6The admixture of the invention is superior to mineral powder in both mechanical property and anti-shrinkage property.
The high-activity concrete admixture is characterized by having wide application range, being capable of replacing 20-30% of cement, such as PHC pipe piles, in concrete prefabricated parts needing high-temperature steam curing (70-90 ℃), and having activity of more than or equal to 105% and 28d activity of more than or equal to 100% after steam curing;
can be used for replacing 40-50% of cement in a prefabricated part steamed at a medium-low temperature (30-60 ℃), and the activity is more than or equal to 100% and the activity is more than or equal to 105% after steaming;
can be used for replacing part or all of the slag micro powder in commercial concrete, and the standard-maintenance activity of 7d is more than or equal to 95 percent, and the standard-maintenance activity of 28d is more than or equal to 105 percent;
the physical ultrafine activation of the inorganic material replaces the excitation activation of a chemical additive, reduces the side effect brought by chemical products, and improves the interface structure of the concrete cement stone and the aggregate.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The high-performance concrete admixture is characterized by comprising the following components in percentage by mass: 30-70% of fly ash, slag micropowder: 20% -50%, functional excitant: 5% -30%;
wherein the functional excitant is prepared by mixing one or more than two of natural gypsum, desulfurized gypsum and phosphogypsum in any proportion; SO in the natural gypsum, the desulfurized gypsum and the phosphogypsum3The content is more than or equal to 40 percent.
2. The high performance concrete admixture as claimed in claim 1, wherein said fly ash and said fine slag powder are both SiO2、Al2O3And CaO as the main component.
3. The high performance concrete admixture as claimed in claim 2, wherein said solid waste comprises SiO2+Al2O3The content of CaO is more than or equal to 70 percent.
4. The admixture of claim 2, wherein said solid waste is selected from the group consisting of nickel slag, lithium slag and steel slag.
5. The high performance concrete admixture as claimed in claim 1, wherein said high activity concrete admixture has a specific surface area of 650m or more2Kg, and the content of particles smaller than 10 mu m is more than or equal to 50 percent, and the content of particles larger than 45 mu m is less than or equal to 5 percent.
6. The production method of the high-performance concrete admixture is characterized by comprising the following steps:
step one, taking 30-70 parts of fly ash and 20-50 parts of slag micro powder according to the weight ratio, and grinding the fly ash and the slag micro powder to be used as active materials;
one or more than two of natural gypsum, desulfurized gypsum and phosphogypsum are mixed in any proportion to be used as a functional excitant, and 5-30 parts of the functional excitant are taken;
step two, conveying the weighed materials into a large storage bin for later use by utilizing a flow pump of the weighed materials, wherein the storage bin adopts a fluidized blanking principle, and a guide cone process is adopted in the bin to realize smooth blanking and uniform blanking; the production ratio is set up in the automatic batching system, various raw materials realize the common blanking under the unified command of the automatic batching system of the computer, various supplies are measured accurately through the reamer electronic scale, realize the continuous accurate blanking, form the synchronous compound batching, the compound supplies are conveyed through the chute and enter the double-shaft mixer before grinding together, pass 1% of automatic metering water distribution at the mixer first, pass the mixer and stir by force, realize the most possible and break up, mix, cool the integrated operation, convey and enter the mill through the stirring leaf finally;
step three: the materials enter the rotary device through the feeding device for grinding, and pass through the discharging device after grinding is finished;
the grinding machine barrel is divided into three bins, wherein one bin is a coarse grinding bin, the second bin is a transition bin, and the third bin is a fine grinding bin; grinding bodies with different sizes are arranged in each bin;
the special grinding machine for ultrafine powder is characterized in that a double-layer partition plate is arranged between a first bin and a second bin in a barrel of the special grinding machine for ultrafine powder, a screening bin type screening partition device is arranged between the second bin and the third bin, the screening bin type screening partition device consists of a feeding grid plate, a discharging grid plate, a screen plate, a partition frame, a lifting plate and a bidirectional discharge cone, the lifting plate is fixed on the partition frame through bolts, and the feeding grid plate and the screen plate are separated by 5cm during installation to form a screening bin;
step four: the grinding mill is further uniformly stirred and ground by an ultra-small round special grinding body, the best impact grinding effect is achieved by ball throwing collision through a gully inverted groove lining plate, meanwhile, the forward feeding of materials can be achieved through the special arrangement structure of the lining plate, the material conveying speed can be controlled, and the grinding effect with the most reasonable fineness and ratio can be achieved;
step five: the composite material is subjected to superfine grinding in the mill and is milled in a high-temperature agglomeration state, the material is conveyed into a double-shaft mixer with a separately arranged mill tail by a mill tail chute, the material is subjected to high-speed scattering, cooling and uniformly mixing integrated operation in the mixer and then is discharged, and meanwhile, the material is subjected to static electricity removal treatment by humidifying and cooling, so that the agglomeration phenomenon of the material is thoroughly eliminated;
step six: the materials stirred by the tail grinding double-shaft stirrer enter the high-efficiency powder concentrator through an air conveying chute, the materials are sorted by using a winnowing principle, and are screened by vibration, so that qualified particles and unqualified particles are effectively distinguished, and the unqualified particles are sorted out and are re-stirred, uniformly mixed and ground again by the stirrer before being re-ground through an air conveying pipeline by the discharging device;
step seven: qualified particles enter a warehousing chute to realize further uniform mixing and static elimination, finally, qualified materials are lifted to the top of a finished product warehouse by a lifter and are thrown into the finished product warehouse by a spreading disc, and the produced product has a specific surface area of more than or equal to 650m2The content of particles with the particle size of more than or equal to 50 percent per kg and less than 10 mu m and the content of particles with the particle size of more than 45 mu m is less than or equal to 5 percent.
7. The method for producing the high-performance concrete admixture as claimed in claim 6, wherein the lining plate adopted in the mill cylinder is a manganese steel lining plate, and a plurality of small lining plate units are spliced and annularly arranged on the inner surface of the cylinder.
8. The method for producing a high-performance concrete admixture according to claim 6, wherein the special mill for ultrafine powders is characterized in that a large-wave corrugated lining plate with a relatively prominent wave shape is adopted in one bin of a mill cylinder, small-wave corrugated lining plates with a relatively gentle wave shape are adopted in two bins and three bins, and an activated lining plate is adopted in every 5 rings of the three bins to replace the small-wave corrugated lining plate.
9. The method for producing the high-performance concrete admixture according to claim 6, wherein the grinding bodies in each bin in the third step are micro steel balls, micro steel forgings or a mixture of micro steel balls and micro steel forgings, the diameters of the adopted steel balls or steel forgings are from phi 40mm to phi 4.1mm, the diameters of the grinding bodies in the first bin, the second bin and the third bin are reduced in sequence, and the filling rate is gradually increased in a step-like manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110503909.9A CN113213802A (en) | 2021-05-10 | 2021-05-10 | High-performance concrete admixture and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110503909.9A CN113213802A (en) | 2021-05-10 | 2021-05-10 | High-performance concrete admixture and production method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113213802A true CN113213802A (en) | 2021-08-06 |
Family
ID=77093963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110503909.9A Pending CN113213802A (en) | 2021-05-10 | 2021-05-10 | High-performance concrete admixture and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113213802A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114213055A (en) * | 2021-12-29 | 2022-03-22 | 中建西部建设湖南有限公司 | Concrete gelling accelerator and preparation method and application thereof |
| CN115490449A (en) * | 2022-10-07 | 2022-12-20 | 江苏金木土科技有限公司 | Preparation method of superfine mineral admixture |
| CN115819031A (en) * | 2022-10-31 | 2023-03-21 | 镇江建科建设科技有限公司 | Steam-cured concrete for assembled components |
| WO2024045526A1 (en) * | 2022-08-31 | 2024-03-07 | 中国建筑材料科学研究总院有限公司 | High-throughput preparation method and apparatus for cement-based materials |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1401607A (en) * | 2002-07-25 | 2003-03-12 | 中国建筑材料科学研究院 | Composite low-heat-release high-active superfine powder concrete admixture and making method thereof |
| CN101935179A (en) * | 2010-08-19 | 2011-01-05 | 上海大学 | Composite mineral additive for high-strength and high-performance concrete and method for preparing concrete |
| CN201768589U (en) * | 2010-07-27 | 2011-03-23 | 四川矿山机器（集团）有限责任公司 | Sieving partition panel for ball mill |
| CN110357474A (en) * | 2019-07-19 | 2019-10-22 | 遵义市聚源建材有限公司 | A kind of concrete additive and preparation method thereof |
| CN110372247A (en) * | 2019-08-27 | 2019-10-25 | 江苏金木土科技有限公司 | Concrete admixture based on iron tailing powder and preparation method thereof |
| CN111268934A (en) * | 2019-12-27 | 2020-06-12 | 胜利油田营海实业集团有限公司 | Modified production preparation method of composite mineral admixture |
-
2021
- 2021-05-10 CN CN202110503909.9A patent/CN113213802A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1401607A (en) * | 2002-07-25 | 2003-03-12 | 中国建筑材料科学研究院 | Composite low-heat-release high-active superfine powder concrete admixture and making method thereof |
| CN201768589U (en) * | 2010-07-27 | 2011-03-23 | 四川矿山机器（集团）有限责任公司 | Sieving partition panel for ball mill |
| CN101935179A (en) * | 2010-08-19 | 2011-01-05 | 上海大学 | Composite mineral additive for high-strength and high-performance concrete and method for preparing concrete |
| CN110357474A (en) * | 2019-07-19 | 2019-10-22 | 遵义市聚源建材有限公司 | A kind of concrete additive and preparation method thereof |
| CN110372247A (en) * | 2019-08-27 | 2019-10-25 | 江苏金木土科技有限公司 | Concrete admixture based on iron tailing powder and preparation method thereof |
| CN111268934A (en) * | 2019-12-27 | 2020-06-12 | 胜利油田营海实业集团有限公司 | Modified production preparation method of composite mineral admixture |
Non-Patent Citations (1)
| Title |
|---|
| 黄拥军: "XCMK超细矿渣磨增产技术", 《四川水泥》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114213055A (en) * | 2021-12-29 | 2022-03-22 | 中建西部建设湖南有限公司 | Concrete gelling accelerator and preparation method and application thereof |
| WO2024045526A1 (en) * | 2022-08-31 | 2024-03-07 | 中国建筑材料科学研究总院有限公司 | High-throughput preparation method and apparatus for cement-based materials |
| CN115490449A (en) * | 2022-10-07 | 2022-12-20 | 江苏金木土科技有限公司 | Preparation method of superfine mineral admixture |
| CN115819031A (en) * | 2022-10-31 | 2023-03-21 | 镇江建科建设科技有限公司 | Steam-cured concrete for assembled components |
| CN115819031B (en) * | 2022-10-31 | 2024-03-29 | 镇江建科建设科技有限公司 | Steam curing concrete for assembled components |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113213802A (en) | High-performance concrete admixture and production method thereof | |
| CN110683774B (en) | Cementing material taking slag-steel slag-gypsum as raw material and preparation method thereof | |
| CN110041028A (en) | A kind of regeneration concrete and preparation method thereof using building waste | |
| CN109455966B (en) | Concrete admixture, preparation method thereof and concrete | |
| CN115819049B (en) | Cement-based grouting material for mounting wind power foundation tower barrel base and preparation method thereof | |
| CN101081727A (en) | Steel slag sand dry powder mortar and production technique thereof | |
| CN101985392B (en) | Plastering mortar using high-volume slag and preparation method thereof | |
| CN105645794B (en) | A kind of large dosage industrial residue portland cement preparation method | |
| CN111205038A (en) | Pumping total iron tailing concrete and preparation method thereof | |
| CN112521089A (en) | Full-hole slag high-performance concrete and preparation method thereof | |
| CN115259725A (en) | Lead-zinc tailing concrete composite admixture and preparation method thereof | |
| CN113526890A (en) | Concrete composite admixture for comprehensively utilizing industrial waste residues and construction wastes | |
| CN106587675B (en) | A kind of high activity nickel slag base cement mixture and preparation method thereof | |
| CN115925299A (en) | Full-solid waste self-excited alkaline cementing material and preparation method thereof | |
| CN111268934A (en) | Modified production preparation method of composite mineral admixture | |
| CN111285648A (en) | High-durability low-viscosity high-strength machine-made sand concrete, preparation method and application | |
| CN113956001A (en) | Iron tailing-desulfurized ash-steel slag multi-element system concrete and preparation method thereof | |
| CN110395956B (en) | Iron tailing micro-powder mortar dry powder for building mortar and preparation method thereof | |
| CN117417175A (en) | Gas slag baking-free ceramsite and preparation method thereof | |
| CN115849811B (en) | High-stability self-compaction concrete and preparation method thereof | |
| CN110937863A (en) | Recyclable cement concrete and preparation method thereof | |
| CN113135696A (en) | Large-dosage steel slag solid waste water hydraulic ecological frame concrete and proportioning determination method thereof | |
| CN111646721A (en) | Concrete admixture developed from sulfur-fixing ash and preparation method thereof | |
| CN116444218B (en) | Full-recycled concrete and preparation method and application thereof | |
| CN115925343B (en) | Baking-free paving brick capable of stably solidifying industrial solid wastes for long time and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210806 |