CN115583813B - Composite admixture for mineral powder-fly ash-steel slag system concrete and preparation method thereof - Google Patents
Composite admixture for mineral powder-fly ash-steel slag system concrete and preparation method thereof Download PDFInfo
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- 239000002893 slag Substances 0.000 title claims abstract description 284
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 154
- 239000010959 steel Substances 0.000 title claims abstract description 154
- 239000004567 concrete Substances 0.000 title claims abstract description 53
- 239000002131 composite material Substances 0.000 title claims abstract description 35
- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 31
- 239000011707 mineral Substances 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 239000000843 powder Substances 0.000 claims abstract description 86
- 239000010881 fly ash Substances 0.000 claims abstract description 72
- 238000000227 grinding Methods 0.000 claims abstract description 50
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 41
- 239000000126 substance Substances 0.000 claims description 33
- 239000000203 mixture Substances 0.000 claims description 22
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 21
- 238000010791 quenching Methods 0.000 claims description 19
- 230000000171 quenching effect Effects 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 13
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 12
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims description 2
- 238000010008 shearing Methods 0.000 claims description 2
- 239000004568 cement Substances 0.000 abstract description 14
- 238000000498 ball milling Methods 0.000 abstract description 8
- 239000004566 building material Substances 0.000 abstract description 8
- 238000006703 hydration reaction Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 7
- 230000036571 hydration Effects 0.000 abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 239000000292 calcium oxide Substances 0.000 description 52
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 52
- 238000005303 weighing Methods 0.000 description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- 239000000395 magnesium oxide Substances 0.000 description 16
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 16
- 238000011068 loading method Methods 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 5
- 239000011398 Portland cement Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- 235000012241 calcium silicate Nutrition 0.000 description 2
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000001879 gelation Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 235000019976 tricalcium silicate Nutrition 0.000 description 2
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000003334 potential effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a composite admixture for mineral powder-fly ash-steel slag system concrete and a preparation method thereof, belonging to the field of building materials. The composite admixture for concreteComprises slag micropowder, fly ash and steel slag micropowder. The invention utilizes a superfine tire vertical mill to grind to form steel slag superfine powder, and then prepares a composite admixture for mineral powder-fly ash-steel slag system concrete with the slag superfine powder and fly ash. The invention solves the technical problems of difficult grinding, poor stability and poor hydration activity of steel slag; the steel slag can only be processed to the fineness of 450 meshes and the specific surface area of 500m by utilizing a conical vertical mill and a common tire vertical mill 2 Technical limitation of/kg; ball milling is utilized to form spherical appearance with the steel slag superfine powder, and the spherical appearance and the S95 grade slag superfine powder and the II grade fly ash form discontinuous grain size grading to cause the technical bottleneck of insufficient mechanical property; the formed composite admixture for concrete can replace part of cement, thereby reducing the cement consumption in the concrete and realizing the purpose of reducing carbon in the field of building materials.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to a composite admixture for mineral powder-fly ash-steel slag system concrete and a preparation method thereof, which can be used in the field of concrete preparation.
Background
Concrete is an indispensable building material in engineering construction processes, and is also the most widely used building material at present. However, the traditional cement concrete industry generates a great deal of energy consumption and resource waste, and the harm to the ecological environment is serious. The metallurgical bulk solid waste-steel slag is applied to the concrete industry, so that the steel slag widely piled up at present can be consumed in a large scale, the energy and resource consumption in the cement concrete production process can be saved, the concrete cost is reduced, and obvious economic and environmental benefits are realized.
The steel slag is obtained by cooling residual slag of steelmaking and can be divided into hot closed slag, hot splashing slag, air quenching slag, roller slag, pressurized hot closed slag and the like according to a treatment mode, and the discharge amount of the steel slag is about 15-20% of the yield of coarse steel. In China, the utilization rate of steel slag is low, and most iron and steel enterprises only stack the residual steel tailings after crushing, magnetic separation and iron recovery, so that the problems of serious land occupation and environmental pollution are caused. The mineral components of the steel slag are greatly influenced by smelting technology, and mainly comprise dicalcium silicate, tricalcium silicate, RO phase, calcium aluminoferrite, free calcium oxide, free magnesium oxide, simple substance iron and the like, wherein the dicalcium silicate and the tricalcium silicate have hydration activity. However, the steel slag is difficult to grind, has poor stability and poor hydration activity; the conical vertical mill and the common tire vertical mill cannot process the steel slag into steel slag superfine powder with more than 400 meshes; the ball-milling steel slag superfine powder presents a spherical shape, so that a discontinuous grain size grading is formed, and the mechanical property is insufficient. The problems limit the application of the steel slag in concrete greatly.
Therefore, the inventor develops and grinds by using a superfine tire vertical mill (also called as superfine roller mill) to form steel slag superfine powder, and then prepares a composite admixture for mineral powder-fly ash-steel slag system concrete with the slag superfine powder and fly ash, and the composite admixture can replace part of cement, thereby reducing the cement consumption in the concrete, realizing the purpose of reducing carbon in the field of building materials, and meeting the current industrial development requirements of energy conservation, environmental protection and recycling economy.
Disclosure of Invention
In order to solve the technical problems of difficult grinding, poor stability and poor hydration activity of the steel slag; the steel slag can only be processed to the fineness of 450 meshes and the specific surface area of 500m by utilizing a conical vertical mill and a common tire vertical mill 2 Technical limitation of/kg; ball-milling steel slag superfine powder to form spherical shape, and mixing with S95 grade slag superfine powder and II grade powdered coalThe ash forms a technical bottleneck of insufficient mechanical properties caused by discontinuous grain size grading; and the demand of the prepared concrete on the cement is large. The invention provides a composite admixture for mineral powder-fly ash-steel slag system concrete, which is prepared by grinding a superfine tire vertical mill (also called as superfine roller mill) to form steel slag superfine powder, and then mixing the steel slag superfine powder, the slag superfine powder and fly ash, so as to solve the problems.
In order to solve the technical problems, the invention is realized by the following technical scheme.
The invention provides a composite admixture for mineral powder-fly ash-steel slag system concrete, which comprises the following raw materials in percentage by weight:
35 to 45 percent of slag micropowder
25 to 35 percent of fly ash
25 to 35 percent of steel slag superfine powder
The slag micropowder is prepared by grinding blast furnace water quenching slag to a specific surface area of 400m by a common tire vertical mill (also called common roller mill) 2 /kg～450m 2 And/kg of the obtained S95 grade slag micropowder.
The fly ash is class II fly ash.
The steel slag superfine powder is obtained by grinding carbon steel slag (such as one or more of hot disintegrating slag, hot splashing slag, air quenching slag, roller slag, pressurized hot disintegrating slag and the like) into steel slag superfine powder with fineness of 600-800 meshes through a superfine tire vertical mill (also called as superfine roller mill). Wherein the chemical composition and the mass percentage of the hot closed slag are CaO (49.90 percent) and Fe respectively 2 O 3 (24.52％)、SiO 2 (11.67％)、MgO(3.94％)、MnO(2.13％)、P 2 O 5 (2.54％)、Al 2 O 3 (2.90％)、TiO 2 (1.27%) and other (1.13%), the chemical composition and mass percentage of hot-splashing slag are CaO (46.78%), fe respectively 2 O 3 (24.40％)、SiO 2 (11.06％)、MgO(5.75％)、MnO(2.19％)、P 2 O 5 (0.91％)、Al 2 O 3 (2.30%) and others (6.6)1 percent of air quenching slag, wherein the chemical composition and the mass percentage of the air quenching slag are CaO (46.86 percent) and Fe respectively 2 O 3 (27.18％)、SiO 2 (10.75％)、MgO(4.81％)、MnO(2.32％)、P 2 O 5 (2.47％)、Al 2 O 3 (3.38％)、TiO 2 (1.16%) and other (1.07%), the chemical composition and mass percentage of the drum slag are CaO (47.56%), fe respectively 2 O 3 (22.00％)、SiO 2 (13.45％)、MgO(8.34％)、MnO(2.41％)、P 2 O 5 (2.30％)、Al 2 O 3 (2.18％)、TiO 2 (0.84％)、Cr 2 O 3 (0.28％)、Na 2 O (0.16%), S (0.03%) and others (0.45%), the chemical composition and mass percentage of the pressured hot disintegrating slag are CaO (48.43%), fe respectively 2 O 3 (22.77％)、SiO 2 (14.11％)、MgO(6.10％)、Al 2 O 3 (2.29％)、MnO(1.88％)、P 2 O 5 (1.57%) and others (2.85%). According to M-F=100 gamma [ M (CaO)/M (CaO+SiO) 2 +Al 2 O 3 )]Calculated as/F, wherein M (CaO) is the mass percent of CaO, M (CaO+SiO) 2 +Al 2 O 3 ) Is CaO, siO 2 With Al 2 O 3 F is fineness. The relation between the chemical component content and fineness of the steel slag superfine powder satisfies M-F which is more than or equal to 0.09 and less than or equal to 0.14.
The invention also provides a preparation method of the composite admixture for the mineral powder-fly ash-steel slag system concrete, which specifically comprises the following steps:
the method comprises the steps of respectively loading slag micropowder, fly ash and steel slag micropowder into three raw material bins, respectively accurately weighing the mass of the slag micropowder, the fly ash and the steel slag micropowder by using an electronic weighing system, then conveying the three materials into a finished product bin, and homogenizing under the action of airflow to form the composite admixture for the mineral powder-fly ash-steel slag system concrete.
The superfine tyre vertical mill (also called as superfine roller mill) is characterized in that a motor is used for driving a speed reducer to drive a grinding disc to rotate, steel slag to be ground is fed into the center of the rotating grinding disc by air locking feeding equipment, and the steel slag moves to the periphery of the grinding disc under the action of centrifugal force and enters a grinding roller way. Under the action of the grinding roll pressure, the steel slag is crushed by the extrusion, grinding and shearing actions. Meanwhile, wind is sprayed upwards at high speed from a wind ring surrounding the millstone, the ground steel slag is blown up by high-speed airflow at the wind ring, the steel slag with thicker granularity is blown back to the millstone for re-grinding, fine powder is brought into a grading machine by wind to be graded, qualified fine powder flows out of the mill along with the air, the qualified fine powder is collected by a grading system (patent number: ZL 201030143470.6) of secondary wind selection to obtain a product, unqualified coarse powder falls to the millstone again under the action of blades of the grading machine, and is re-ground together with the newly fed steel slag (patent number: ZL 200820113450.1), and the superfine grinding of 3 mu m-45 mu m is completed by circulation.
Compared with the prior art, the invention has the following beneficial effects:
(1) The superfine steel slag superfine powder formed by grinding the superfine tire vertical mill (also called as superfine roller grinding) has fineness of 600-800 meshes and gravel shape (such as prismatic shape, sub-prismatic shape and sub-circular shape). The superfine powder of the steel slag with fineness of 600-800 meshes and shape gravel (such as prismatic, sub-prismatic and sub-circular) is uniformly distributed in the concrete, and has the effects of particle filling and fiber embedding so as to improve the mechanical property. The technology breaks through the technical barrier that the grinding steel slag of a common tire vertical mill (also called as common roller mill) can only reach 450 meshes; solves the technical problem that the mechanical property is insufficient due to discontinuous grain size grading of the ultra-fine steel slag powder with the small grain size and the fine slag powder with the large grain size and the fly ash caused by ball milling.
(2) The steel slag superfine powder with the fineness of 600-800 meshes has extremely large specific surface area, can rapidly generate hydration reaction, and eliminates f-CaO in the steel slag superfine powder; meanwhile, the alkalinity generated in the f-CaO elimination process can excite the potential activities of slag micropowder and fly ash, and the mechanical properties of concrete, especially the early (7 d) mechanical properties, are improved. The technology solves the technical problems of poor stability and poor early hydration activity caused by f-CaO contained in the steel slag.
(3) The main gelation system of the steel slag superfine powder is CaO-SiO 2 -Al 2 O 3 Wherein the CaO content is high, al 2 O 3 The content is relatively higherLow in the nature of overburning Portland cement clinker. The specific surface area of the steel slag superfine powder is improved by the superfine grinding technology, and the problems of low hydration speed and insufficient early mechanical property of the steel slag superfine powder are solved. According to M-F=100 gamma [ M (CaO)/M (CaO+SiO) 2 +Al 2 O 3 )]Calculated as/F, where M (CaO) is the CaO content, M (CaO+SiO) 2 +Al 2 O 3 ) Is CaO, siO 2 With Al 2 O 3 F is the fineness. The chemical component and fineness of the steel slag superfine powder satisfy that M-F is more than or equal to 0.09 and less than or equal to 0.14, and when M-F is less than 0.09, caO-SiO is illustrated 2 -Al 2 O 3 The CaO content in the alloy is low (Al) 2 O 3 Content ratio) or fineness is large, which is beneficial to improving early strength; when M-F is more than 0.14, caO-SiO is explained 2 -Al 2 O 3 High CaO content (Al) 2 O 3 Low content ratio) or small fineness, and is beneficial to improving the later strength.
(4) According to the invention, the composite admixture for concrete is prepared from slag micropowder, fly ash and steel slag micropowder, and the formed mineral powder-fly ash-steel slag system gelation system can replace part of cement, so that the cement dosage in the concrete is reduced, and the purpose of reducing carbon in the field of building materials is realized.
(5) The invention solves the technical problems of difficult grinding, poor stability and poor hydration activity of steel slag; the steel slag can only be processed to the fineness of 450 meshes and the specific surface area of 500m by utilizing a conical vertical mill and a common tire vertical mill 2 Technical limitation of/kg; ball milling is utilized to form spherical appearance with the steel slag superfine powder, and the spherical appearance and the S95 grade slag superfine powder and the II grade fly ash form discontinuous grain size grading to cause the technical bottleneck of insufficient mechanical property; and the demand of the prepared concrete on the cement is large.
(6) The invention uses superfine tire vertical mill (also called as superfine roller mill) to grind into steel slag superfine powder, then prepares a composite admixture for mineral powder-fly ash-steel slag system concrete with slag superfine powder and fly ash, and can replace part of cement, thereby reducing the cement consumption in the concrete, realizing the purpose of reducing carbon in the building material field, and meeting the current industrial development requirements of energy conservation, environmental protection and recycling economy.
Drawings
Fig. 1 is an SEM image of steel slag superfine powder formed by grinding an ultrafine tire vertical mill (also called as an ultrafine roller mill).
Fig. 2 is an SEM image of steel slag superfine powder formed by ball milling and grinding.
As can be seen from fig. 1 and 2, the appearance of the steel slag superfine powder formed by grinding the superfine tire vertical mill (also called as superfine roller milling) is in a gravel shape (such as prismatic shape, sub-prismatic shape and sub-circular shape), and the appearance of the steel slag superfine powder formed by ball milling and grinding is only in a spherical shape.
Detailed Description
The present invention is described in detail below with reference to specific examples, but the present invention is not limited to the following examples.
Example 1
Taking 100g of the product of the invention as an example, the components and the mass ratio thereof are as follows:
45% of slag micropowder
Fly ash 25%
30% of steel slag superfine powder
The slag micropowder is prepared by grinding blast furnace water quenching slag to a specific surface area of 425m by a common tire vertical mill (also called common roller mill) 2 And/kg of the obtained S95 grade slag micropowder.
The fly ash is class II fly ash.
The steel slag superfine powder is obtained by grinding the pressurized hot disintegrating slag into steel slag superfine powder with fineness of 700 meshes through a superfine tire vertical mill (also called as superfine roller mill), and the chemical composition and the mass percentage of the pressurized hot disintegrating slag are CaO (48.43 percent) and Fe respectively 2 O 3 (22.77％)、SiO 2 (14.11％)、MgO(6.10％)、Al 2 O 3 (2.29％)、MnO(1.88％)、P 2 O 5 (1.57%) and others (2.85%). According to M-F=100 gamma [ M (CaO)/M (CaO+SiO) 2 +Al 2 O 3 )]And (3) calculating the relation between the content of chemical components of the steel slag superfine powder and the fineness of the steel slag superfine powder to meet M-F=0.11.
The method comprises the steps of respectively loading slag micropowder, fly ash and steel slag micropowder into three raw material bins, respectively accurately weighing the mass of the slag micropowder, the fly ash and the steel slag micropowder by using an electronic weighing system, then conveying the three materials into a finished product bin, and homogenizing under the action of airflow to form the composite admixture for the mineral powder-fly ash-steel slag system concrete.
Example 2
Taking 100g of the product of the invention as an example, the components and the mass ratio thereof are as follows:
slag micropowder 35%
Fly ash 30%
35% of steel slag superfine powder
The slag micropowder is prepared by grinding blast furnace water quenching slag to a specific surface area of 400m by a common tire vertical mill (also called common roller mill) 2 And/kg of the obtained S95 grade slag micropowder.
The fly ash is class II fly ash.
The steel slag superfine powder is obtained by grinding a mixture of roller slag and hot disintegrating slag according to a mass ratio of 1:1 through a superfine tire vertical mill (also called as superfine roller mill) to obtain steel slag superfine powder with fineness of 800 meshes, and the chemical composition and the mass percentage of the roller slag are CaO (47.56 percent) and Fe respectively 2 O 3 (22.00％)、SiO 2 (13.45％)、MgO(8.34％)、MnO(2.41％)、P 2 O 5 (2.30％)、Al 2 O 3 (2.18％)、TiO 2 (0.84％)、Cr 2 O 3 (0.28％)、Na 2 O (0.16%), S (0.03%) and others (0.45%), the chemical composition and mass percentage of the hot closed slag are CaO (49.90%), fe respectively 2 O 3 (24.52％)、SiO 2 (11.67％)、MgO(3.94％)、MnO(2.13％)、P 2 O 5 (2.54％)、Al 2 O 3 (2.90％)、TiO 2 (1.27%) and others (1.13%). According to M-F=100 gamma [ M (CaO)/M (CaO+SiO) 2 +Al 2 O 3 )]And (3) calculating the relation between the content of chemical components of the steel slag superfine powder and the fineness of the steel slag superfine powder to meet M-F=0.10.
The method comprises the steps of respectively loading slag micropowder, fly ash and steel slag micropowder into three raw material bins, respectively accurately weighing the mass of the slag micropowder, the fly ash and the steel slag micropowder by using an electronic weighing system, then conveying the three materials into a finished product bin, and homogenizing under the action of airflow to form the composite admixture for the mineral powder-fly ash-steel slag system concrete.
Example 3
Taking 100g of the product of the invention as an example, the components and the mass ratio thereof are as follows:
40% of slag micropowder
35% of fly ash
25% of steel slag superfine powder
The slag micropowder is prepared by grinding blast furnace water quenching slag to a specific surface area of 450m by a common tire vertical mill (also called common roller mill) 2 And/kg of the obtained S95 grade slag micropowder.
The fly ash is class II fly ash.
The steel slag superfine powder is obtained by grinding air quenching slag into steel slag superfine powder with fineness of 600 meshes through a superfine tire vertical mill (also called as superfine roller mill), and the chemical composition and the mass percentage of the air quenching slag are CaO (46.86 percent) and Fe respectively 2 O 3 (27.18％)、SiO 2 (10.75％)、MgO(4.81％)、MnO(2.32％)、P 2 O 5 (2.47％)、Al 2 O 3 (3.38％)、TiO 2 (1.16%) and others (1.07%). According to M-F=100 gamma [ M (CaO)/M (CaO+SiO) 2 +Al 2 O 3 )]And (3) calculating the relation between the content of chemical components of the steel slag superfine powder and the fineness of the steel slag superfine powder to meet M-F=0.13.
The method comprises the steps of respectively loading slag micropowder, fly ash and steel slag micropowder into three raw material bins, respectively accurately weighing the mass of the slag micropowder, the fly ash and the steel slag micropowder by using an electronic weighing system, then conveying the three materials into a finished product bin, and homogenizing under the action of airflow to form the composite admixture for the mineral powder-fly ash-steel slag system concrete.
Example 4
Taking 100g of the product of the invention as an example, the components and the mass ratio thereof are as follows:
40% of slag micropowder
Fly ash 25%
35% of steel slag superfine powder
The slag micropowder is prepared by grinding blast furnace water quenching slag to a specific surface area of 450m by a common tire vertical mill (also called common roller mill) 2 And/kg of the obtained S95 grade slag micropowder.
The fly ash is class II fly ash.
The steel slag superfine powder is obtained by grinding roller slag to 750 meshes through a superfine tire vertical mill (also called as superfine roller mill), and the chemical composition and the mass percentage of the roller slag are respectively CaO (47.56 percent) and Fe 2 O 3 (22.00％)、SiO 2 (13.45％)、MgO(8.34％)、MnO(2.41％)、P 2 O 5 (2.30％)、Al 2 O 3 (2.18％)、TiO 2 (0.84％)、Cr 2 O 3 (0.28％)、Na 2 O (0.16%), S (0.03%) and others (0.45%). According to M-F=100 gamma [ M (CaO)/M (CaO+SiO) 2 +Al 2 O 3 )]And (3) calculating the relation between the content of chemical components of the steel slag superfine powder and the fineness of the steel slag superfine powder to meet M-F=0.10.
The method comprises the steps of respectively loading slag micropowder, fly ash and steel slag micropowder into three raw material bins, respectively accurately weighing the mass of the slag micropowder, the fly ash and the steel slag micropowder by using an electronic weighing system, then conveying the three materials into a finished product bin, and homogenizing under the action of airflow to form the composite admixture for the mineral powder-fly ash-steel slag system concrete.
Example 5
Taking 100g of the product of the invention as an example, the components and the mass ratio thereof are as follows:
45% of slag micropowder
Fly ash 30%
25% of steel slag superfine powder
The slag micropowder is the blast furnace water quenched slag which is vertically arranged by common tiresGrinding (also called as common roller grinding) to a specific surface area of 400m 2 And/kg of the obtained S95 grade slag micropowder.
The fly ash is class II fly ash.
The steel slag superfine powder is obtained by grinding hot disintegrating slag into 650 meshes through a superfine tire vertical mill (also called as superfine roller mill), wherein the chemical composition and the mass percentage of the hot disintegrating slag are CaO (49.90 percent) and Fe respectively 2 O 3 (24.52％)、SiO 2 (11.67％)、MgO(3.94％)、MnO(2.13％)、P 2 O 5 (2.54％)、Al 2 O 3 (2.90％)、TiO 2 (1.27%) and others (1.13%). According to M-F=100 gamma [ M (CaO)/M (CaO+SiO) 2 +Al 2 O 3 )]And (3) calculating the relation between the content and fineness of the chemical components of the steel slag superfine powder to meet M-F=0.12.
The method comprises the steps of respectively loading slag micropowder, fly ash and steel slag micropowder into three raw material bins, respectively accurately weighing the mass of the slag micropowder, the fly ash and the steel slag micropowder by using an electronic weighing system, then conveying the three materials into a finished product bin, and homogenizing under the action of airflow to form the composite admixture for the mineral powder-fly ash-steel slag system concrete.
Example 6
Taking 100g of the product of the invention as an example, the components and the mass ratio thereof are as follows:
slag micropowder 35%
35% of fly ash
30% of steel slag superfine powder
The slag micropowder is prepared by grinding blast furnace water quenching slag to a specific surface area of 425m by a common tire vertical mill (also called common roller mill) 2 And/kg of the obtained S95 grade slag micropowder.
The fly ash is class II fly ash.
The steel slag superfine powder is obtained by grinding hot splashing slag to 700 meshes through a superfine tire vertical mill (also called as superfine roller mill), wherein the chemical composition and the mass percentage of the hot splashing slag are respectively CaO (46.78 percent),Fe 2 O 3 (24.40％)、SiO 2 (11.06％)、MgO(5.75％)、MnO(2.19％)、P 2 O 5 (0.91％)、Al 2 O 3 (2.30%) and others (6.61%). According to M-F=100 gamma [ M (CaO)/M (CaO+SiO) 2 +Al 2 O 3 )]And (3) calculating the relation between the content of chemical components of the steel slag superfine powder and the fineness of the steel slag superfine powder to meet M-F=0.11.
The method comprises the steps of respectively loading slag micropowder, fly ash and steel slag micropowder into three raw material bins, respectively accurately weighing the mass of the slag micropowder, the fly ash and the steel slag micropowder by using an electronic weighing system, then conveying the three materials into a finished product bin, and homogenizing under the action of airflow to form the composite admixture for the mineral powder-fly ash-steel slag system concrete.
Comparative example 1
Taking 100g of the product of the invention as an example, the components and the mass ratio thereof are as follows:
slag micropowder 35%
35% of fly ash
30% of steel slag superfine powder
The slag micropowder is prepared by grinding blast furnace water quenching slag to a specific surface area of 425m by a common tire vertical mill (also called common roller mill) 2 And/kg of the obtained S95 grade slag micropowder.
The fly ash is class II fly ash.
The steel slag superfine powder is obtained by ball milling hot splashing slag to fineness of 700 meshes, and the chemical composition and the mass percentage of the hot splashing slag are respectively CaO (46.78 percent) and Fe 2 O 3 (24.40％)、SiO 2 (11.06％)、MgO(5.75％)、MnO(2.19％)、P 2 O 5 (0.91％)、Al 2 O 3 (2.30%) and others (6.61%). According to M-F=100 gamma [ M (CaO)/M (CaO+SiO) 2 +Al 2 O 3 )]And (3) calculating the relation between the content of chemical components of the steel slag superfine powder and the fineness of the steel slag superfine powder to meet M-F=0.11.
The method comprises the steps of respectively loading slag micropowder, fly ash and steel slag micropowder into three raw material bins, respectively accurately weighing the mass of the slag micropowder, the fly ash and the steel slag micropowder by using an electronic weighing system, then conveying the three materials into a finished product bin, and homogenizing under the action of airflow to form the composite admixture for the mineral powder-fly ash-steel slag system concrete.
Comparative example 2
Taking 100g of the product of the invention as an example, the components and the mass ratio thereof are as follows:
slag micropowder 35%
35% of fly ash
30% of steel slag superfine powder
The slag micropowder is prepared by grinding blast furnace water quenching slag to a specific surface area of 425m by a common tire vertical mill (also called common roller mill) 2 And/kg of the obtained S95 grade slag micropowder.
The fly ash is class II fly ash.
The steel slag superfine powder is obtained by grinding hot splashing slag into steel slag superfine powder with the fineness of 450 meshes through a common tire vertical mill (also called common roller mill), wherein the chemical composition and the mass percentage of the hot splashing slag are CaO (46.78 percent) and Fe respectively 2 O 3 (24.40％)、SiO 2 (11.06％)、MgO(5.75％)、MnO(2.19％)、P 2 O 5 (0.91％)、Al 2 O 3 (2.30%) and others (6.61%). According to M-F=100 gamma [ M (CaO)/M (CaO+SiO) 2 +Al 2 O 3 )]And (3) calculating the relation between the content of chemical components of the steel slag superfine powder and the fineness of the steel slag superfine powder to meet M-F=0.17.
The method comprises the steps of respectively loading slag micropowder, fly ash and steel slag micropowder into three raw material bins, respectively accurately weighing the mass of the slag micropowder, the fly ash and the steel slag micropowder by using an electronic weighing system, then conveying the three materials into a finished product bin, and homogenizing under the action of airflow to form the composite admixture for the mineral powder-fly ash-steel slag system concrete.
Comparative example 3
Taking 100g of the product of the invention as an example, the components and the mass ratio thereof are as follows:
slag micropowder 50%
50% of fly ash
0% of steel slag superfine powder
The slag micropowder is prepared by grinding blast furnace water quenching slag to a specific surface area of 425m by a common tire vertical mill (also called common roller mill) 2 And/kg of the obtained S95 grade slag micropowder.
The fly ash is class II fly ash.
Respectively loading slag micropowder and fly ash into two raw material bins, respectively accurately weighing the mass of the slag micropowder and the mass of the fly ash by using an electronic weighing system, and then conveying the two materials into a finished product bin, and homogenizing under the action of airflow to form the composite admixture for the mineral powder-fly ash system concrete.
Comparative example 4
Taking 100g of the product of the invention as an example, the components and the mass ratio thereof are as follows:
slag micropowder 35%
35% of fly ash
30% of steel slag superfine powder
The slag micropowder is prepared by grinding blast furnace water quenching slag to a specific surface area of 425m by a common tire vertical mill (also called common roller mill) 2 And/kg of the obtained S95 grade slag micropowder.
The fly ash is class II fly ash.
The steel slag superfine powder is obtained by grinding refined slag to 700 meshes through a superfine tire vertical mill (also called as superfine roller mill), and the chemical composition and the mass percentage of the refined slag are respectively SiO 2 (5.66％)、CaO(47.19％)、MgO(7.61％)、Al 2 O 3 (27.21％)、FeO(3.06％)、MnO(1.06％)、TiO 2 (0.39％)、P 2 O 5 (0.30%) and others (7.52%). According to M-F=100 gamma [ M (CaO)/M (CaO+SiO) 2 +Al 2 O 3 )]And (3) calculating the relation between the content and fineness of the chemical components of the steel slag superfine powder to meet M-F=0.08.
The method comprises the steps of respectively loading slag micropowder, fly ash and steel slag micropowder into three raw material bins, respectively accurately weighing the mass of the slag micropowder, the fly ash and the steel slag micropowder by using an electronic weighing system, then conveying the three materials into a finished product bin, and homogenizing under the action of airflow to form the composite admixture for the mineral powder-fly ash-steel slag system concrete.
The performance of the composite admixture for concrete prepared in examples 1 to 6 and comparative examples 1 to 4 was measured as follows:
the composite admixture for concrete (180 kg), ordinary Portland cement P.O 42.5.5 (220 kg), sand (800 kg), stones (920 kg) with the diameter of 5-31.5mm, water (185 kg) and an antifreezing agent (14 kg) are mixed, C30 concrete is obtained under the action of a forced mixer, and the compressive strength is tested according to the test method for physical and mechanical properties of concrete (GB/T50081-2019). Meanwhile, the compressive strength of the C30 concrete formula used by the high-density city vibration original cement Co-Ltd, namely fly ash (75 kg), ordinary Portland cement P.O 42.5.42.5 (325 kg), sand (800 kg), stones (920 kg) with the thickness of 5-31.5mm, water (185 kg) and an antifreezing agent (14 kg) is compared.
TABLE 1 compressive Strength of C30 concrete prepared from composite admixture for mineral powder-fly ash-steel slag System concrete
TABLE 2 economic analysis of C30 concrete prepared from composite admixture for mineral powder-fly ash-steel slag system concrete
As can be seen from Table 2, the cement system formed by slag micropowder, fly ash, steel slag micropowder and ordinary Portland cement P.O 42.5.5 has 7d compressive strength higher than 25MPa and 28d compressive strength higher than 35MPa in examples 1-6 and enterprise formulations. Calculated, the cost of example 1 was 146.3 yuan/ton, the cost of example 2 was 143.0 yuan/ton, the cost of example 3 was 142.6 yuan/ton, the cost of example 4 was 143.6 yuan/ton, the cost of example 5 was 144.9 yuan/ton, the cost of example 6 was 141.6 yuan/ton, and the cost of the enterprise recipe was 155.9 yuan/ton.
Claims (5)
1. The composite admixture for the mineral powder-fly ash-steel slag system concrete is characterized by comprising the following raw materials in percentage by weight:
35 to 45 percent of slag micropowder
25 to 35 percent of fly ash
25% -35% of steel slag superfine powder;
the slag micropowder is prepared by grinding blast furnace water quenching slag by a common tire vertical mill until the specific surface area is 400m 2 /kg~450m 2 3/kg of the obtained S95-grade slag micropowder;
the steel slag superfine powder is steel slag superfine powder obtained by grinding carbon steel slag to 600-800 meshes through a superfine tire vertical mill;
the superfine tire vertical mill drives a speed reducer to drive a grinding disc to rotate by utilizing a motor, steel slag to be ground is fed into the center of the rotating grinding disc by air locking feeding equipment, and moves to the periphery of the grinding disc under the action of centrifugal force and enters a grinding roller way; under the action of grinding roll pressure, the steel slag is crushed under the actions of extrusion, grinding and shearing; meanwhile, wind is sprayed upwards at a high speed from a wind ring surrounding a millstone, the ground steel slag is blown up by high-speed airflow at the wind ring, the steel slag with larger granularity is blown back to the millstone for re-grinding, fine powder is brought into a grading machine by wind to be graded, qualified fine powder flows out of the millstone along with the air, the fine powder is collected by a grading system of secondary wind selection to be a product, unqualified coarse powder falls to the millstone again under the action of a blade of the grading machine, and is ground again together with the newly fed steel slag, and the superfine grinding of 3 mu m-45 mu m is completed by circulation;
the relation between the chemical component content and fineness of the steel slag superfine powder satisfies M-F which is more than or equal to 0.09 and less than or equal to 0.14;
the M-f=100 gamma [ M (CaO)/M (cao+sio) 2 +Al 2 O 3 ）] / F；
Wherein: m (CaO) is the mass percent of CaO, and M (CaO+SiO) 2 +Al 2 O 3 ) Is CaO, siO 2 With Al 2 O 3 F is fineness.
2. The composite admixture for mineral powder-fly ash-steel slag system concrete according to claim 1, wherein the fly ash is class ii fly ash.
3. The composite admixture for mineral powder-fly ash-steel slag system concrete according to claim 1, wherein the carbon steel slag is one or more of hot closed slag, hot splashing slag, air quenching slag, roller slag and pressurized hot closed slag.
4. The composite admixture for the mineral powder-fly ash-steel slag system concrete as claimed in claim 3, wherein the chemical composition and the mass percentage of the hot closed slag are as follows: caO49.90%, fe 2 O 3 24.52%、SiO 2 11.67%、MgO3.94%、MnO2.13%、P 2 O 5 2.54%、Al 2 O 3 2.90%、TiO 2 1.27% and other 1.13%, the chemical composition and mass percentage of hot splashing slag are respectively: caO46.78%, fe 2 O 3 24.40%、SiO 2 11.06%、MgO5.75%、MnO2.19%、P 2 O 5 0.91%、Al 2 O 3 2.30% and other 6.61%, the chemical composition and mass percentage of the air quenching slag are respectively as follows: caO46.86%, fe 2 O 3 27.18%、SiO 2 10.75%、MgO4.81%、MnO2.32%、P 2 O 5 2.47%、Al 2 O 3 3.38%、TiO 2 1.16% and other 1.07%, the chemical composition and mass percentage of the roller slag are respectively as follows: caO47.56%, fe 2 O 3 22.00%、SiO 2 13.45%、MgO8.34%、MnO2.41%、P 2 O 5 2.30%、Al 2 O 3 2.18%、TiO 2 0.84%、Cr 2 O 3 0.28%、Na 2 0.16% of O, 0.03% of S and 0.45% of other components, wherein the chemical compositions and the mass percentages of the pressured hot disintegrating slag are respectively as follows: caO48.43%, fe 2 O 3 22.77%、SiO 2 14.11%、MgO6.10%、Al 2 O 3 2.29%、MnO1.88%、P 2 O 5 1.57% and other 2.85%.
5. A method for preparing the composite admixture for the mineral powder-fly ash-steel slag system concrete according to claim 1, which is characterized by comprising the following steps:
after the mass of slag micropowder, fly ash and steel slag micropowder are respectively and accurately weighed, the three materials are sent into a finished product bin, and homogenized under the action of airflow to form the composite admixture for the mineral powder-fly ash-steel slag system concrete.
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| JP2002241169A (en) * | 2000-12-14 | 2002-08-28 | Kawasaki Steel Corp | Production process of steelmaking slag hardened body |
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| CN104961413A (en) * | 2015-07-03 | 2015-10-07 | 济南大学 | Method for preparing road concrete from admixtures steel slag micro-powder, superfine slag powder and fly ash |
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