AU2020101096A4 - The Preparation Method of Steel Fiber Reinforced Ultra-high Performance Concrete by Synergistic Utilization of Multi-solid Waste - Google Patents
The Preparation Method of Steel Fiber Reinforced Ultra-high Performance Concrete by Synergistic Utilization of Multi-solid Waste Download PDFInfo
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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
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/21—Mixtures thereof with other inorganic cementitious materials or other activators with calcium sulfate containing activators
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
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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
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/0045—Polymers chosen for their physico-chemical characteristics
- C04B2103/0051—Water-absorbing polymers, hydrophilic polymers
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/10—Compositions or ingredients thereof characterised by the absence or the very low content of a specific material
- C04B2111/1037—Cement free compositions, e.g. hydraulically hardening mixtures based on waste materials, not containing cement as such
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2641—Polyacrylates; Polymethacrylates
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- 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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Abstract
of Descriptions
The invention provides a method for preparation of steel fiber reinforced ultra-high
performance concrete by synergistic utilization of Multi-solid waste, which belongs to the
technical field of solid waste resource utilization. The concrete contains 35wt% -50wt% of
cementitious material, 35wt% -50wt% of aggregate, 0-3wt% of water reducing agent, 5wt%
-8wt% of steel fiber and 7wt% -9wt% of water. In the preparation, firstly, the slag, the hot braised
BOF slag, the refining slag and the industrial by-product gypsum are separately ground or mixed
ground, and are mixed thoroughly to obtain the cementitious material. Then, the steel fiber
reinforced ultra-high performance concrete by synergistic utilization of Multi-solid waste is
prepared by mixing the cementitious material, aggregate, water reducing agent, steel fiber and
water, molding the mixture, and curing. The invention prepares ultra-high performance concrete
with a compressive strength of 100MPa-16OMPa and a flexural strength of 35MPa-45MPa under
28-day standard curing conditions. This invention significantly improves the utilization rate of
solid waste in ultra-high performance concrete, reduces costs, and has obvious environmental and
economic benefits.
Description
Descriptions
The Preparation Method of Steel Fiber Reinforced Ultra-high Performance Concrete by Synergistic Utilization of Multi-solid Waste
Technical Field
The invention relates to the technical field of solid waste resource utilization, in particular to the preparation method of steel fiber reinforced ultra-high performance concrete by synergistic utilization of multi-solid waste.
Background Technology
Compared with ordinary concrete, Ultra-High Performance Concrete, or UHPC in short, can reduce the internal defect rate of materials by increasing the amount of cementing materials, using high-activity cementing materials, reducing the water-binder ratio, and removing coarse aggregate. By adding steel fiber to improve the toughness and strength of concrete, the overall performance of ultra-high performance concrete is significantly improved compared with ordinary concrete, and the application range is wider.
At present, ultra-high performance concrete also has some defects such as high cement consumption, excessive hydration heat, large shrinkage, expensive production cost, complicated production process, etc. Although traditional ultra-high performance concrete can already use mineral admixtures such as slag, fly ash and silica fume to improve the overall performance of concrete, with the widespread application of ore powder, fly ash and silica fume, their prices have increased year by year. It is imperative to develop new mineral admixtures for ultra-high performance concrete.
As a kind of metallurgical solid waste, the current status of comprehensive utilization of steel slag in China is not ideal. The current comprehensive utilization rate is only 10% to 20% in China. The main mineral phases of steel slag have hydration potential, and it can be used in the construction industry after crushing and grinding. The converter steel slag accounts for the largest proportion of steel slag. Its treatment processes are mainly hot splash method, hot braised method, wind quenching method and drum method. Among them, hot braised method and drum method are the most widely used. The quality of the converter steel slag produced is relatively stable and this kind of steel slag is more suitable for industrial applications. The refining slag in steel slag has strong hydration activity and rapid early reaction is easy for grinding and processing, and is also very suitable for concrete production. When the steel slag and refining slag of the hot braised method are hydrated together with the slag, they can provide an alkaline environment to fully stimulate the activity of the slag; if supplemented with industrial by-product gypsum to introduce sulfate ions, the decomposition rate of raw materials can be accelerated to promote the rapid generation of hydration products. Under this synergistic effect of multiple solid wastes, all aspects of concrete performance can surpass that of ordinary cement concrete. It is also feasible to apply this idea to ultra-high performance concrete.
On the other hand, a large amount of fine aggregate is used in ultra-high-performance concrete. If natural or blasted stone sand is used as aggregate, the cost will be greatly increased. Bao Steel rotating furnace steel slag (BSRS) has stable performance, and its hardness is higher than that of natural sand and general machine-made sand. The use of all or part of the drum method converter steel slag can reduce the cost and increase the utilization rate of solid waste on the basis of ensuring performance, which helps to save sand and gravel resources.
In the prior art, patent publication numbers CN106747112B, CN108358566A, CN107963855A, and CN109293311A respectively authorized or disclosed different types of ultra-high performance concrete and its preparation method. Among the components of these concretes, cement accounts for more than 50wt% of the total amount of cementitious materials, the cost is higher, and natural aggregate is used, which has a destructive effect on the environment.
In addition, CN109592946A discloses an ultra-high performance concrete mixed with steel slag and its preparation method. Among them, the amount of steel slag is up to 30wt% of the cement mass, and the concrete has the characteristics of good fluidity, small shrinkage and high strength. However, in this concrete, the amount of cement per cubic meter is still at least 372kg, and this concrete uses natural aggregates. Therefore, there is still room for development in terms of cost reduction.
CN106470956B authorizes an ultra-high performance concrete with low cement content. The amount of cement in the concrete cementing material can be reduced to 17.7wt%, but it still needs to be added with cement, and the mechanical strength at 28 days is only above 90MPa.
Invention Summary
The present invention is to solve the problem that the existing ultra-high performance concrete has a large amount of cement, a low overall utilization rate of steel slag, a large amount of natural aggregates, environmental pollution and high cost, and the problem that the strength of ultra-high performance concrete with low cement content is difficult to increase. The invention provides a multi-solid waste synergistic preparation of steel fiber reinforced ultra-high performance concrete and a preparation method.
The concrete is based on mass percentage, including 35wt% -50wt% of cementitious material, 35wt% -50wt% of aggregate, 03wt% of water reducing agent, 5wt% -8wt% of steel fiber and 7wt% -9wt% of water; Among them, the cementing material is prepared by wt% ~ 70wt% of slag, 15wt% ~ 35wt% of hot braised BOF slag, 5wt% ~ 20wt% of refining slag, and lOwt% -20wt% of industrial by-product gypsum, and the aggregate is quartz sand or / and Bao Steel rotating furnace slag(BSRS).
Among them, the specific surface area of slag and BOF slag is 400m 2 /kg~75m 2 /kg.
The specific surface area of refining slag and industrial by-product gypsum is 300m 2 /kg~ 600m 2/kg.
The slag is granulated blast furnace slag in accordance with GB / T 203 "GranulatedBlast FurnaceSlag Used in Cement".
The hot braised BOF slag is the hot braised BOF slag in accordance with YB / T 022 "Steel Slag Used in Cement".
Refined slag is the refined slag in accordance with GB/T 33813-2017 "Refined slagpowder used in cement and concrete".
The industrial by-product gypsum is one or more of desulphurization gypsum, phosphogypsum, fluorogypsum, lemon gypsum, waste ceramic mould gypsum, titanium gypsum, mirabilite gypsum, salt gypsum.
The steel fiber is a steel fiber in accordance with YBT 151-1999 "Steel Fiberfor Concrete".
Aggregates need to be processed into aggregates in accordance with GB / T14684-2011 "ConstructionSand".
The standard curing of the concrete in 28 days has a compressive strength of 100MPa~ 160MPa and a flexural strength of 35MPa~45MPa. The preparation method of steel fiber reinforced ultra-high performance concrete by synergistic utilization of multi-solid waste includes the following steps:
(1) Preparation of cementitious materials: slag, converter slag, refining slag and industrial by-product gypsum are separately ground and mixed to obtain cementitious materials;
(2) After mixing the cementitious material in step (1) with aggregate, water reducing agent, steel fiber and water according to the mass ratio, multi-solid waste synergistic preparation of steel fiber reinforced ultra-high performance concrete is prepared by casting and curing.
Among them, in step (1), slag, hot braised converter slag, refining slag and industrial by-product gypsum can be also mixed then ground.
The beneficial effects of the above technical solutions of the present invention are as follows:
In the above scheme, the synergistic excitation effect of slag, hot braised converter slag, refining slag and industrial by-product gypsum is used, no cement is used in the concrete system, the amount of natural aggregate is reduced, and the strength of the concrete is guaranteed to reach a high level. It solves the existing technical problems and provides a new idea for the production of ultra-high performance concrete at low cost and high added value. The specific advantages are as follows:
(1) The raw materials involved in the present invention can be entirely derived from industrial solid waste, no longer using cement as a component, reducing the cost of ultra-high performance concrete and protecting the environment;
(2) The present invention can coordinately dispose of various industrial solid wastes such as slag, hot braised BOF slag, Bao Steel rotating furnace steel slag (BSRS), refining slag, industrial by-product gypsum, etc., realizing the transformation of waste into treasure and improving the greenness of ultra-high performance concrete;
(3) The invention effectively improves the comprehensive utilization rate of BOF slag and refining slag, and provides a new way for large-scale consumption of steel slag;
(4) The present invention proposes an alternative to ultra-high performance concrete natural aggregate, which can reduce the amount of natural aggregate on a large scale and save natural resources;
(5) Compared with other similar ultra-high performance concrete, the strength index of the present invention is significantly improved.
Detailed Description of the Presently Preferred Embodiments In order to make the technical problems to be solved by the invention, technical schemes and advantages more clear, the following will describe in detail with reference to specific embodiments.
The invention provides the preparation method of steel fiber reinforced ultra-high performance concrete by synergistic utilization of multi-solid waste, the concrete is based on mass percentage, including 35wt% -50wt% of cementitious material, 35wt% -50wt% of aggregate, 0~3wt% of water reducing agent, 5wt% -8wt% of steel fiber and 7wt% -9wt% of water; Among them, the cementing material is prepared by 40wt% ~ 70wt% of slag, wt% ~ 35wt% of hot braised BOF slag, 5wt% ~ 20wt% of refining slag, and lOwt% ~ wt% of industrial by-product gypsum, and the aggregate is quartz sand or / and Bao Steel rotating furnace slag(BSRS).
In the preparation of the concrete, firstly, the slag, the hot braised BOF slag, the refining slag and the industrial by-product gypsum are separately ground or mixed, and are mixed to obtain a cemented material; Then, after evenly mixing the cementitious material, aggregate, water reducing agent, steel fiber and water according to the mass percentage, the steelfiber reinforced ultra-high performance concrete is prepared by multi-solid waste and curing.
It will be described below in conjunction with specific embodiments.
Embodiment 1 The preparation method of steel fiber reinforced ultra-high performance concrete by synergistic utilization of multi-solid waste is prepared from the following raw materials: by weight percentage, 56.25wt% of slag, 18.75wt% of hot braised BOF slag, 5wt% of refining slag
, wt% of desulfurization gypsum; the slag and the hot braised BOF slag are mixed to a specific surface area of 550m 2 /kg, refined slag is ground to a specific surface area of 564m 2/kg, and desulfurized gypsum is ground to a specific surface area of 400m 2/kg. In concrete, by weight percentage, cementing material accounts for 38.lwt%, aggregate accounts for 47.7wt%, water reducer accounts for 0.4wt%, steel fiber accounts for 6.4wt%, and mixing water accounts for 7.6wt%. Among them, the aggregate is the Bao Steel rotating furnace slag (BSRS), the water-reducing agent is a solid polycarboxylic acid type high-efficiency water-reducing agent, and the steel fiber adopts a linear steel fiber with an aspect ratio of 60.
The concrete mix example is shown in the following table: (amount of material per cubic meter of concrete: kg/m 3 )
Cementing material Water Slag Hot Refining Desulfurized BSRS Steel fiber Water reducer braised slag gypsum
BOF slag
525.0 175.0 46.7 186.7 1166.7 156.0 186.7 4.7
According to the mix ratio shown in the above table, the concrete test block is placed in the concrete mixer and mixed thoroughly. The compressive strength mold of 150mm x 150mm x 150mm and the flexural strength mold of 150mm x 150mm x 600mm are injected under the condition of temperature 20 5 °C and relative humidity is not less than 60%, which is placed on a concrete vibration table to vibrate and shape. After molding, the test block is placed under standard curing conditions of curing temperature of 20 °C 2 °C and relative humidity is not less than 95%. After 24 hours of curing, it is demoulded, and it is continuously placed at curing temperature of 20 °C 2 °C, the relative humidity is not less than 95% for a period of 28 d, the compressive strength is 162.2 MPa and the flexural strength is 45.3 MPa.
Embodiment 2 The preparation method of steel fiber reinforced ultra-high performance concrete by synergistic utilization of multi-solid waste is prepared from the following raw materials: by weight percentage, 56.25wt% of slag, 18.75wt% of hot braised BOF slag, 5wt% of refining slag, wt% of desulfurization gypsum; the slag and the hot braised BOF slag are mixed to a specific surface area of 550m 2 /kg, refined slag is ground to a specific surface area of 564m 2/kg, and desulfurized gypsum is ground to a specific surface area of 400m 2/kg. In concrete, by weight percentage, cementing material accounts for 38.lwt%, aggregate accounts for 47.7wt%, water reducer accounts for 0.2wt%, steel fiber accounts for 6.4wt%, and mixing water accounts for 7.6wt%. Among them, the aggregate is quartz sand, the water-reducing agent is a solid polycarboxylic acid type high-efficiency water-reducing agent, and the steel fiber adopts a linear steel fiber with an aspect ratio of 60.
The concrete mix example is shown in the following table: (amount of material per cubic meter of concrete: kg/m 3 )
Cementing material Quartz Water Slag Hot braised Refining Desulfurize sand Steel fiber Water reuer sand reducer BOF slag slag d gypsum
525.0 175.0 46.7 186.7 1166.7 156.0 186.7 4.7
According to the mix ratio shown in the above table, the concrete test block is placed in the concrete mixer and mixed evenly. The compressive strength mold of 150mm x 150mm x 150mm and the flexural strength mold of 150mm x 150mm x 600mm are injected under the condition of temperature 20 5 °C and relative humidity is not less than 60%, which is placed on a concrete vibration table to vibrate and shape. After molding, the test block is placed under standard curing conditions of curing temperature of 20 °C 2 °C and relative humidity is not less than 95%. After 24 hours of curing, it is demoulded, and it is continuously placed at curing temperature of 20 °C 2 °C, the relative humidity is not less than 95% for a period of 28 d, the compressive strength is 149.0MPa and the flexural strength is 40.3 MPa.
Embodiment 3 The preparation method of steel fiber reinforced ultra-high performance concrete by synergistic utilization of multi-solid waste is prepared from the following raw materials: by weight percentage, 56.25wt% of slag, 18.75wt% of hot braised BOF slag, 5wt% of refining slag, wt% of fluorine gypsum; the slag and the hot braised BOF slag are mixed to a specific surface area of 520m2/kg, and the refined slag and fluorogypsum are mixed to a specific surface area of 460m2/kg. In concrete, by weight percentage, cementing material accounts for 42.8wt%, aggregate accounts for 42.8wt%, water reducer accounts for 0.25%, steel fiber accounts for 6.7wt%, and mixing water accounts for 8.2wt%. Among them, the aggregate is half of quartz sand and the Bao Steel rotating furnace slag (BSRS), the water-reducing agent is a solid polycarboxylic acid type high-efficiency water-reducing agent, and the steel fiber adopts a linear steel fiber with an aspect ratio of 45.
The concrete mix example is shown in the following table: (amount of material per cubic meter of concrete: kg/m3) Cementing material Quartz Steel Water Slag Hotbraised Refining Fluorog sand fiber reducer BOF slag slag ypsum
682.5 157.5 52.5 157.5 525.0 525.0 165.0 200.0 6.1
According to the mix ratio shown in the above table, the concrete test block is placed in the concrete mixer and mixed evenly. The compressive strength mold of 150mm x 150mm x 150mm and the flexural strength mold of 150mm x 150mm x 600mm are injected under the condition of temperature 20 5 °C and relative humidity is not less than 60%, which is placed on a concrete vibration table to vibrate and shape. After molding, the test block is placed under standard curing conditions of curing temperature of 20 °C 2 °C and relative humidity is not less than 95%. After 24 hours of curing, it is demoulded, and it is continuously placed at curing temperature of 20 °C 2 °C, the relative humidity is not less than 95% for a period of 28 d, the compressive strength is 142.9MPa and the flexural strength is 39.1MPa.
Embodiment 4
The preparation method of steel fiber reinforced ultra-high performance concrete by synergistic utilization of multi-solid waste is prepared from the following raw materialsb: y weight percentage, 45wt% of slag, 25wt% of hot braised BOF slag, 15wt% of refining slag, wt% of waste ceramic mould gypsum; the slag and the hot braised BOF slag are mixed to a specific surface area of 560m 2 /kg, and the refined slag and waste ceramic mould gypsum are mixed to a specific surface area of 460m 2 /kg. In concrete, by weight percentage, cementing material accounts for 46.3wt%, aggregate accounts for 38.5wt%, water reducer accounts for 0.24wt%, steel fiber accounts for 6.5wt%, and mixing water accounts for 8.5wt%. Among them, the aggregate is the Bao Steel rotating furnace slag (BSRS), the water-reducing agent is a solid polycarboxylic acid type high-efficiency water-reducing agent, and the steel fiber adopts a linear steel fiber with an aspect ratio of 60.
The concrete mix example is shown in the following table: (amount of material per cubic meter of concrete: kg/m 3 )
Cementing material
Slag Hot Refining waste Water braised slag ceramic BSRS Steel fiber Water reducer BOF mould slag gypsum
515.6 286.4 171.9 171.9 954.3 160.0 210.0 5.9
According to the mix ratio shown in the above table, the concrete test block is placed in the concrete mixer and mixed evenly. The compressive strength mold of 150mm x 150mm x 150mm and the flexural strength mold of 150mm x 150mm x 600mm are injected under the condition of temperature 20 5 °C and relative humidity is not less than 60%, which is placed on a concrete vibration table to vibrate and shape. After molding, the test block is placed under standard curing conditions of curing temperature of 20 °C 2 °C and relative humidity is not less than 95%. After 24 hours of curing, it is demoulded, and it is continuously placed at curing temperature of 20 °C 2 °C, the relative humidity is not less than 95% for a period of 28 d, the compressive strength is 119.8MPa and the flexural strength is 36.4MPa.
Embodiment 5 The preparation method of steel fiber reinforced ultra-high performance concrete by synergistic utilization of multi-solid waste is prepared from the following raw materials: by weight percentage, 40wt% of slag, 30wt% of hot braised BOF slag, 20wt% of refining slag, 1Owt% of salt gypsum; the slag and the hot braised BOF slag are mixed to a specific surface area of 560m 2 /kg, and the refined slag and salt gypsum are mixed to a specific surface area of 460m 2 /kg. In concrete, by weight percentage, cementing material accounts for 46.3wt%, aggregate accounts for 38.5wt%, water reducer accounts for 0.24wt%, steel fiber accounts for 6.5wt%, and mixing water accounts for 8.5wt%. Among them, the aggregate is the Bao Steel rotating furnace slag (BSRS), the water-reducing agent is a solid polycarboxylic acid type high-efficiency water-reducing agent, and the steel fiber adopts a linear steel fiber with an aspect ratio of 60.
The concrete mix example is shown in the following table: (amount of material per cubic meter of concrete: kg/m 3 )
Cementing material Water Salt BSRS Steel fiber Water reducer Slag Hot Refining gypsum braised slag BOF slag
458.3 343.7 229.1 114.6 954.3 160.0 210.0 5.9
According to the mix ratio shown in the above table, the concrete test block is placed in the concrete mixer and mixed evenly. The compressive strength mold of 150mm x 150mm x 150mm and the flexural strength mold of 150mm x 150mm x 600mm are injected under the condition of temperature 20 5 °C and relative humidity is not less than 60%, which is placed on a concrete vibration table to vibrate and shape. After molding, the test block is placed under standard curing conditions of curing temperature of 20 °C 2 °C and relative humidity is not less than 95%. After 24 hours of curing, it is demoulded, and it is continuously placed at curing temperature of 20 °C 2 °C, the relative humidity is not less than 95% for a period of 28 d, the compressive strength is 104.2MPa and the flexural strength is 35.OMPa.
The above is the preferred embodiment of the present invention. It should be pointed out that for those of ordinary technicians in the technical field, without departing from the principles of the present invention, several improvements and retouches can be made. It should also be regarded as the protection scope of the present invention.
Claims (8)
1. A method for preparing a steel fiber reinforced ultra-high performance concrete by synergistic utilization of Multi-solid waste is characterized in that, in terms of mass percentage, it contains 35wt% -50wt% of cementitious material, 35wt% -50wt% of aggregate, 0-3wt% of water reducing agent, 5wt% -8wt% of steel fiber and 7wt% -9wt% of water; Among them, the cementing material is prepared by 40wt% ~ 70wt% of slag, 15wt% ~ 35wt% of hot braised BOF slag, 5wt% ~ 20wt% of refining slag, and 1Owt% ~20wt% of industrial by-product gypsum, and the aggregate is quartz sand or / and Bao Steel rotating furnace slag(BSRS).
2. The steel fiber reinforced ultra-high performance concrete by synergistic utilization of Multi-solid waste according to claim 1, characterized in that the hot braised BOF slag in accordance withYB / T 022 "Steel Slag Used in Cement".
3. The steel fiber reinforced ultra-high performance concrete by synergistic utilization of Multi-solid waste according to claim 1, characterized in that the refining slag in accordance with GB/T 33813-2017 "Refining Slag Powder Used in Cement and Concrete".
4. The steel fiber reinforced ultra-high performance concrete by synergistic utilization of Multi-solid waste according to claim 1, characterized in that the slag is a kind of granulated blast furnace that complies with GB / T 203 "GranulatedBlast FurnaceSlag Used in Cement".
5. The steel fiber reinforced ultra-high performance concrete by synergistic utilization of Multi-solid waste according to claim 1, characterized in that: the industrial by-product gypsum is one or more kind of desulphurization gypsum, phosphogypsum, fluorogypsum, lemon gypsum, waste ceramic mould gypsum, titanium gypsum, mirabilite gypsum, salt gypsum.
6. The steel fiber reinforced ultra-high performance concrete by synergistic utilization of Multi-solid waste according to any one of claims 1 to 5, characterized in that the concrete has a compressive strength of 100MPa~16OMPa in 28 days under standard curing conditions. The flexural strength reaches 35MPa ~ 45MPa.
7. A method for preparing a steel fiber reinforced ultra-high-performance concrete by synergistic utilization of Multi-solid waste according to any one of claims 1 to 6, characterized in that it includes the following steps:
(1) Preparation of cementitious materials: slag, BOF slag, refining slag and industrial by-product gypsum are separately ground and mixed to obtain cementitious materials;
(2) After the cementitious material in step (1) is mixed with aggregate, water reducing agent, steel fiber and water according to the mass ratio, the mixture is casted and cured to prepare steel fiber reinforced ultra-high performance concrete by synergistic utilization of Multi-solid waste.
8. The preparation method of steel fiber reinforced ultra-high performance concrete by synergistic utilization of Multi-solid waste according to claim 7, characterized in that slag, hot braised BOF slag, refining slag and industrial by-product gypsum is mixed and ground in step (1).
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