CN111348871A - High-titanium slag sand reactive powder concrete and preparation method thereof - Google Patents

High-titanium slag sand reactive powder concrete and preparation method thereof Download PDF

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Publication number
CN111348871A
CN111348871A CN201811573609.2A CN201811573609A CN111348871A CN 111348871 A CN111348871 A CN 111348871A CN 201811573609 A CN201811573609 A CN 201811573609A CN 111348871 A CN111348871 A CN 111348871A
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titanium slag
parts
slag sand
powder concrete
reactive powder
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李军
卢忠远
李晓英
牛云辉
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Southwest University of Science and Technology
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Southwest University of Science and Technology
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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 hydraulic cements other than calcium sulfates
    • C04B28/021Ash cements, e.g. fly ash cements ; Cements based on incineration residues, e.g. alkali-activated slags from waste incineration ; Kiln dust cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04Waste materials; Refuse
    • C04B18/14Waste materials; Refuse from metallurgical processes
    • C04B18/141Slags
    • C04B18/144Slags from the production of specific metals other than iron or of specific alloys, e.g. ferrochrome slags
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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 hydraulic cements other than calcium sulfates
    • C04B28/04Portland cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00017Aspects relating to the protection of the environment
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/20Mortars, concrete or artificial stone characterised by specific physical values for the density
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Abstract

The invention provides a high-titanium slag sand reactive powder concrete and a preparation method thereof, wherein the preparation method comprises the following steps: drying, crushing and grading the high-titanium slag to obtain graded high-titanium slag sand; uniformly mixing cement, fly ash, silica fume and steel fiber, then adding water and a water reducing agent, and uniformly mixing to obtain slurry; and mixing the graded high-titanium slag sand with the slurry, molding and maintaining to obtain the active powder concrete. The active powder concrete comprises, by mass, 55-65 parts of high-titanium slag sand, 15-24 parts of cement, 5-8 parts of fly ash, 2.5-4 parts of silica fume, 2-5.5 parts of steel fiber, 4.5-8.5 parts of water and 0.5-1.0 part of water reducing agent. The product prepared by the method has high compressive strength and flexural strength, can be used for preparing underground railway channels and sleepers, can also be applied to engineering structures such as sponge city construction, underground pipelines, prefabricated assembly pipe galleries and the like, and is widely applied.

Description

High-titanium slag sand reactive powder concrete and preparation method thereof
Technical Field
The invention belongs to the field of application of high-performance building materials and solid wastes in high-performance concrete, and particularly relates to high-titanium slag sand reactive powder concrete and a preparation method thereof.
Background
With the development of engineering structures in the directions of large span, super high rise, heavy load and the like, the common concrete is difficult to meet the requirements of engineering construction. Meanwhile, in recent years, quality problems of concrete projects such as bridges, houses, pavements and the like at home and abroad continuously occur, and attention and research on high-performance concrete are promoted.
Reactive Powder Concrete (RPC) is a new type of ultra-high performance Concrete developed successfully in france by PierreRichard et al in the 90 s of the 20 th century. The concrete is prepared by taking active powder and fine aggregate as raw materials according to the close packing principle. At present, the material is widely concerned in various fields such as civil engineering, water conservancy, mines, bridges, military engineering and the like. In the existing production method, the raw material proportion of the active powder concrete has large dosage of quartz sand and quartz powder, usually about 1400Kg/m3. And the price of quartz sand and quartz powder is high, so that the production cost of the reactive powder concrete is greatly increased, and the further popularization and application of RPC are limited.
The high titanium slag is TiO generated after the vanadium titano-magnetite iron making2Industrial solid waste with mass content more than 15 percent. However, the utilization rate of the high titanium slag is not high at present, and the accumulation amount of the high titanium slag in China is estimated to reach 2 hundred million tons primarily, and is still increased at the rate of 2000 ten thousand tons per year, thereby causing serious damage to the ecological environment. Therefore, it is necessary to fully expand the application field of the high titanium slag to reduce the ecological environment pressure.
Disclosure of Invention
In view of the deficiencies in the prior art, it is an object of the present invention to address one or more of the problems in the prior art as set forth above. For example, it is an object of the present invention to provide a method for preparing a high titanium slag sand reactive powder concrete. The method of the invention not only can obviously reduce the cost of the active powder concrete and broaden the sources of the aggregate used by the active powder concrete, but also effectively relieves the harm to the ecological environment caused by the accumulation of a large amount of high-titanium slag.
In order to accomplish the above object, an aspect of the present invention provides a method for preparing high titanium slag sand reactive powder concrete, which may include the steps of: drying, crushing and grading the high-titanium slag to obtain graded high-titanium slag sand; uniformly mixing cement, fly ash, silica fume and steel fiber, then adding water and a water reducing agent, and uniformly mixing to obtain slurry; mixing the graded high-titanium slag sand with the slurry, molding and maintaining to obtain the active powder concrete, wherein the high-titanium slag sand, the cement, the fly ash, the silicon powder, the steel fiber, the water and the water reducing agent are in the following mass parts: 55 to 65 parts of high titanium slag sand, 15 to 24 parts of cement, 5 to 8 parts of fly ash, 2.5 to 4 parts of silica fume, 2 to 5.5 parts of steel fiber, 4.5 to 8.5 parts of water and 0.5 to 1.0 part of water reducing agent.
In an exemplary embodiment of the method for preparing the high titanium slag sand reactive powder concrete of the present invention, the high titanium slag sand may include, in mass percent: TiO 2216%~23%、SiO215%~23%、CaO 17%~25%,Al2O318%~22%,MgO 6%~9%,Fe2O34%~7%。
In an exemplary embodiment of the method for preparing the high titanium slag sand reactive powder concrete of the present invention, the grading treatment comprises the following steps by mass: 35 to 45 portions of high titanium slag with the grain diameter of 1.18 to 0.6mm, 30 to 45 portions of high titanium slag with the grain diameter of 0.6 to 0.3mm, and 15 to 25 portions of high titanium slag with the grain diameter of 0.3 to 0.15 mm.
In an exemplary embodiment of the method for preparing the high titanium slag sand reactive powder concrete, the curing may include mixing the high titanium slag sand with the slurry, forming, curing in an environment with a temperature of 18-22 ℃ and a humidity of 95% or more for 20-28 h, demolding, and curing in a steam, boiling water or steam-pressure environment with a temperature of 75-85 ℃ for 40-52 h.
In an exemplary embodiment of the method for preparing the high-titanium slag sand reactive powder concrete of the present invention, the high-titanium slag sand may be particles of molten high-titanium slag having a particle size of less than 1.18mm after cooling, crushing and sieving, and the loose bulk density of the high-titanium slag sand is 1350Kg/m3~1465Kg/m3The compact bulk density is 1800Kg/m3~2001Kg/m3The apparent density is 3000Kg/m3~3260Kg/m3
In an exemplary embodiment of the method for preparing the high titanium slag sand reactive powder concrete of the present invention, SiO contained in the silica fume2The mass percent can be not less than 92 percent, and the cement is one or the combination of more of ordinary portland cement, pozzolanic portland cement and composite portland cement with the strength grade of not less than 42.5 MPa.
The invention also provides high-titanium slag sand reactive powder concrete prepared by the preparation method.
In an exemplary embodiment of the high titanium slag sand reactive powder concrete of the present invention, the density of the high titanium slag sand reactive powder concrete may be 2700Kg/m or less3The compressive strength can be more than or equal to 170MPa, and the flexural strength can be more than or equal to 22 MPa.
Compared with the prior art, the invention has the beneficial effects that:
(1) the high-titanium slag adopted by the method has good circularity, almost has no needle flaky particles, is favorable for realizing compact accumulation, further improves the compactness of the active powder concrete and improves the mechanical property;
(2) the high-titanium slag particles adopted by the invention have stable crystallization and low glass phase content, and can not cause poor durability due to alkali aggregate reaction when used as aggregates; meanwhile, ions in the glass phase are dissolved out in a long-term alkaline environment and react with the components of the cementing material to generate hydration products, so that the interface compactness of the aggregate and the slurry is improved, and the long-term performance of the material can be ensured;
(3) the high-titanium slag sand can completely replace the aggregate for the conventional active powder concrete such as quartz sand, quartz powder and the like, and the cost of the active powder concrete is greatly reduced.
(4) The active powder concrete has higher compactness, mechanical property and durability, is suitable for engineering structures such as rail transit, sponge city construction, underground pipelines, prefabricated assembly pipe galleries and the like, and is a high-performance green building material product encouraged by the state.
(5) The invention uses the industrial waste-high titanium slag which is difficult to be utilized for the high-performance concrete, solves the problem of raw material shortage in the field of construction, realizes the high-efficiency and high-quality utilization of the solid waste, relieves the environmental load and improves the ecological environment.
(6) The product of the invention has simple preparation process, convenient operation, economy and environmental protection; from the aspects of comprehensive utilization of high-titanium slag and production technology, economy and environmental protection of prefabricated assembly pipe gallery products, the invention has great social, economic and environmental benefits and strong practicability.
Drawings
The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic flow chart showing a method for preparing a high titanium slag sand reactive powder concrete according to an exemplary embodiment of the present invention.
Detailed Description
Hereinafter, a high titanium slag sand reactive powder concrete and a method for preparing the same according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.
Specifically, on one hand, the traditional reactive powder concrete adopts a large amount of quartz sand and quartz powder as raw materials, and because the prices of the quartz sand and the quartz powder are high, the production cost of the reactive powder concrete is inevitably increased; on the other hand, high-titanium slag is used as a byproduct generated in the process of smelting pig iron from vanadium-titanium iron ore, has a large accumulation amount at present, and needs to be applied urgently. The milled high-titanium slag powder has good compatibility with cement and additives and low price. The high-titanium slag is used for replacing quartz sand and quartz powder, so that the production cost of the active powder concrete can be greatly reduced, the environmental problem caused by long-term accumulation of the high-titanium slag can be solved, the titanium slag is changed into valuable, and a new way is opened up for the application of the high-titanium slag.
FIG. 1 is a schematic flow chart showing a method for preparing a high titanium slag sand reactive powder concrete according to an exemplary embodiment of the present invention.
The invention provides a preparation method of high-titanium slag sand reactive powder concrete. In an exemplary embodiment of the method for preparing the high titanium slag sand reactive powder concrete of the present invention, the method may include:
and step S01, drying, crushing, screening and designing the high-titanium slag to obtain the high-titanium slag sand after the grading design.
In this embodiment, the high titanium slag sand includes, in mass percent: TiO 2216%~23%、SiO215%~23%、CaO 17%~25%,Al2O318%~22%,MgO 6%~9%,Fe2O34 to 7 percent of the total weight of the composition, and the balance of inevitable impurities. The high titanium slag is naturally dried or dried, the particles of the high titanium slag are stable in crystallization, low in glass phase content and good in circularity, and needle flake particles hardly exist. The high-titanium slag is used as aggregate, and poor durability caused by alkali aggregate reaction is avoided.
In the embodiment, the grading treatment comprises 35 to 45 parts by mass of high-titanium slag particles with the particle size of 1.18 to 0.6mm, 30 to 45 parts by mass of high-titanium slag particles with the particle size of 0.6 to 0.3mm, and 15 to 25 parts by mass of high-titanium slag particles with the particle size of 0.3 to 0.15 mm. The advantage that sets up above-mentioned gradation and handle lies in, and the aggregate is piled up compactly, and the void fraction is little, can improve the slurry parcel layer thickness of aggregate when fixed slurry mixing volume, is of value to intensity improvement and stable in structure, when fixed intensity, can reduce the minimum demand of slurry, is of value to cost reduction. Further, the grading treatment comprises 35-48 parts by mass of high-titanium slag particles with the particle size of 1.18-0.6 mm, 32-44 parts by mass of high-titanium slag particles with the particle size of 0.6-0.3 mm and 15-28 parts by mass of high-titanium slag particles with the particle size of 0.3-0.15 mm.
In this embodiment, the high titanium slag sand may be a particle of molten high titanium slag having a particle size of less than 1.18mm after cooling, crushing and sieving. Further, the high titanium slag sand may be solid particles having a particle size of less than 1.16 mm. The loose bulk density of the high titanium slag sand may be 1350Kg/m3~1465Kg/m3Further, 1377Kg/m3~1458Kg/m3And further, it may be 1415.2Kg/m3. The compact bulk density may be 1800Kg/m3~2001Kg/m3Further, the close packing density may be 1875Kg/m 3-1991 Kg/m3, for example, 1901.8Kg/m3. The apparent density may be 3000Kg/m3~3260Kg/m3Further, it may be 3088Kg/m3~3250Kg/m3For example, it may be 3169.9Kg/m3
And step S02, mixing cement, fly ash, silica fume and steel fiber uniformly, then adding water and a water reducing agent, mixing uniformly to obtain slurry with good flowing property, adding the graded high-titanium slag sand into the slurry, molding and maintaining to obtain the active powder concrete.
In this embodiment, the high titanium slag sand, cement, fly ash, silica powder, steel fiber, water, and water reducing agent after the grading treatment may be in the following mass parts: 55 to 65 parts of high titanium slag sand, 15 to 24 parts of cement, 5 to 8 parts of fly ash, 2.5 to 4 parts of silica fume, 2 to 5.5 parts of steel fiber, 4.5 to 8.5 parts of water and 0.5 to 1.0 part of water reducing agent. Further, the high titanium slag sand comprises, by mass, 55-63 parts of high titanium slag sand, 16-25 parts of cement, 5-9 parts of fly ash, 3-4 parts of silica fume, 2-5 parts of steel fiber, 4.5-8 parts of water and 0.5-1.0 part of water reducing agent.
By setting the mass ratio, the reactive powder concrete with high compactness, good mechanical property and durability and long-term temperature performance can be prepared.
In this embodiment, the cement may be one or two combinations of silicate system cements with strength grade not lower than 42.5MPa, such as ordinary portland cement, pozzolanic portland cement, and composite portland cement.
In this example, SiO in the silica fume2The mass percentage should not be less than 92%.
In this embodiment, the activity index of the fly ash may be greater than 70%, and further, the activity index of the fly ash may be greater than 75%.
In this embodiment, the water reducing agent may be a polycarboxylic acid water reducing agent. The steel fibers may be copper micro steel fibers. Of course, the water reducing agent and the steel fiber are not limited thereto, and any water reducing agent and steel fiber commonly used in the art may be used.
In this embodiment, after the slurry configuration is completed, the graded high titanium slag sand may be added to the slurry in a shorter time. For example, the addition may be made at 1 minute.
In this embodiment, the molded product may be maintained in an environment with a temperature of 18 ℃ to 22 ℃ and a humidity of 95% or more for 20 hours to 24 hours, for example, in an environment with a temperature of 20 ℃ and a humidity of 95% or more for 24 hours. After the mould is removed, the concrete is placed in a steam, boiling water or autoclaved environment with the temperature of 75-85 ℃ for continuous maintenance for 40-52 h, and the active powder concrete is prepared. For example, the mixture is cured in steam at a temperature of 85 ℃ for 50 h.
In the above, it should be noted that there is no strict sequence between the preparation of the slurry and the preparation of the high titanium slag sand, and the preparation may be performed simultaneously or step by step.
Another aspect of the present invention provides a reactive powder concrete, which, in an exemplary embodiment of the reactive powder concrete of the present invention, can be prepared by the above-described high titanium slag sand reactive powder concrete preparation method. The density of the active powder concrete can be less than or equal to 2700Kg/m3The compressive strength is more than or equal to 170MPa, and the flexural strength is more than or equal to 22 MPa. Furthermore, the density of the active powder concrete can be less than or equal to 2600Kg/m3Compressive strength not less than 180MPa, fracture resistanceThe strength is more than or equal to 25 MPa.
In this embodiment, the high titanium slag sand may include, in mass percent: TiO 2216%~23%、SiO215%~23%、CaO 17%~25%,Al2O318%~22%,MgO 6%~9%,Fe2O34%~7%。
In this embodiment, SiO contained in the silica fume2The mass percentage can be not less than 92 percent, and the cement is one or the combination of more of ordinary portland cement, pozzolanic portland cement and composite portland cement with the strength grade of not less than 42.5 MPa.
In this embodiment, the high-titanium slag sand is a particle of molten high-titanium slag which is cooled, crushed and sieved to have a particle size smaller than 1.18mm, and the bulk density of the high-titanium slag sand may be 1350Kg/m3~1465Kg/m3The compact bulk density may be 1800Kg/m3~2001Kg/m3The apparent density can be 3000Kg/m3~3260Kg/m3
In order that the above-described exemplary embodiments of the invention may be better understood, further description thereof with reference to specific examples is provided below.
Example 1:
the high-titanium slag sand reactive powder concrete is prepared from 61.1 parts of high-titanium slag sand, 17.4 parts of cement, 8.7 parts of fly ash, 2.8 parts of silica fume, 3.0 parts of steel fiber, 0.6 part of polycarboxylic acid water reducing agent and 6.4 parts of water in parts by mass.
The preparation method comprises the following steps:
1) drying the high titanium slag in a 105 ℃ oven, and crushing the high titanium slag into particles with the particle size of less than 1.18mm in a crusher. Then the powder is sieved into three size fractions of 1.18mm-0.6mm, 0.6mm-0.3mm and 0.3mm-0.15mm for standby.
2) According to the mass parts, 61.1 parts of high-titanium slag sand, 17.4 parts of cement, 8.7 parts of fly ash, 2.8 parts of silica fume, 3.0 parts of steel fiber, 0.6 part of water reducing agent and 6.5 parts of water are mixed into powder;
3) uniformly mixing the powder and the steel fiber in the step 2, adding water, uniformly stirring, slowly adding the high-titanium slag sand obtained in the step 1, stirring, injection molding, and vibrating for compacting;
4) curing the molded sample obtained in the step 3 in an environment with the temperature of 20 ℃ and the humidity of 96% for 24 hours, and then demolding; and (3) curing the demoulded sample in a steam environment at 75 ℃ for 40h to obtain the high-titanium slag reactive powder concrete.
Example 1 test results for samples: apparent density is 2610Kg/m3The breaking strength is 23.19MPa, and the compressive strength is 161.55 MPa.
Example 2:
the high-titanium slag sand reactive powder concrete is prepared from 56.5 parts of high-titanium slag sand, 20.16 parts of cement, 10.08 parts of fly ash, 3.36 parts of silica fume, 2.8 parts of steel fiber, 0.4 part of polycarboxylic acid water reducing agent and 6.7 parts of water in parts by mass.
The preparation method comprises the following steps:
1) naturally drying the high-titanium slag, and crushing the high-titanium slag into particles with the particle size of less than 1.18mm in a crusher. Then the powder is sieved into three size fractions of 1.18mm-0.6mm, 0.6mm-0.3mm and 0.3mm-0.15mm for standby.
2) Mixing 56.5 parts of high-titanium slag sand, 20.16 parts of cement, 10.08 parts of fly ash, 3.36 parts of silica fume, 2.8 parts of steel fiber, 0.4 part of water reducing agent and 6.7 parts of water by mass to obtain powder;
3) uniformly mixing the powder and the steel fiber in the step 2, adding water, uniformly stirring, slowly adding the high-titanium slag sand obtained in the step 1, stirring, injection molding, and vibrating for compacting;
4) curing the molded sample obtained in the step 3 in an environment with the temperature of 22 ℃ and the humidity of 98% for 24 hours, and then demolding; and (5) curing the demoulded sample in a hot water environment at 85 ℃ for 52 hours.
Example 2 test results of the samples: the apparent density is 2630Kg/m3The flexural strength was 24.71MPa and the compressive strength was 178.88 MPa.
Example 3:
the high-titanium slag sand reactive powder concrete is prepared from 54.1 parts of high-titanium slag sand, 21.30 parts of cement, 10.65 parts of fly ash, 3.55 parts of silica fume, 3.3 parts of steel fiber, 0.8 part of polycarboxylic acid water reducing agent and 6.2 parts of water in parts by mass.
The preparation method of the reactive powder concrete comprises the following steps:
1) drying the high titanium slag in a 105 ℃ oven, and crushing the high titanium slag into particles with the particle size of less than 1.18mm in a crusher. Then the powder is sieved into three size fractions of 1.18mm-0.6mm, 0.6mm-0.3mm and 0.3mm-0.15mm for standby.
2) Mixing 54.1 parts of high-titanium slag sand, 21.30 parts of cement, 10.65 parts of fly ash, 3.55 parts of silica fume, 3.3 parts of steel fiber, 0.8 part of water reducing agent and 6.2 parts of water by mass to obtain powder;
3) uniformly mixing the powder and the steel fiber in the step 2, adding water, uniformly stirring, slowly adding the high-titanium slag sand obtained in the step 1, stirring, injection molding, and vibrating for compacting;
4) curing the molded sample obtained in the step 3 in an environment with the temperature of 21 ℃ and the humidity of 97% for 24 hours, and then demolding; and (4) curing the demoulded sample in a steam environment at 80 ℃ for 45 hours.
Example 3 test results for the samples: the apparent density is 2650Kg/m3The flexural strength was 31.33MPa and the compressive strength was 195.68 MPa.
Example 4:
the high-titanium slag sand reactive powder concrete is prepared by mixing 61.4 parts of high-titanium slag sand, 18.42 parts of cement, 9.21 parts of fly ash, 3.07 parts of silica fume, 1.4 parts of steel fiber, 0.4 part of polycarboxylic acid water reducing agent and 6.1 parts of water in parts by mass.
The preparation method of the reactive powder concrete comprises the following steps:
1) naturally drying the high-titanium slag, and crushing the high-titanium slag into particles with the particle size of less than 1.18mm in a crusher. Then the powder is sieved into three size fractions of 1.18mm-0.6mm, 0.6mm-0.3mm and 0.3mm-0.15mm for standby.
2) Weighing the raw materials according to the composition of 61.4 parts of high-titanium slag sand, 18.42 parts of cement, 9.21 parts of fly ash, 3.07 parts of silica fume, 1.4 parts of steel fiber, 0.4 part of water reducing agent and 6.1 parts of water in parts by mass;
3) uniformly mixing the powder and the steel fiber in the step 2, adding water, uniformly stirring, slowly adding titanium slag, stirring, injection molding, and vibrating for compacting;
4) curing the molded sample obtained in the step 3 in an environment with the temperature of 22 ℃ and the humidity of 95% for 24 hours, and then demolding; and (4) curing the demoulded sample in an autoclave environment at 82 ℃ for 48 hours.
Example 4 test results for samples: the apparent density is 2650Kg/m3The flexural strength was 25.16MPa, and the compressive strength was 197.01 MPa.
Examples 1-4 reactive powder concrete and the preparation method thereof the raw material composition and the mixture ratio are as follows:
the cementitious material in the above table refers to a mixture of cement, fly ash and silica fume.
Examples 1-4 the properties of the reactive powder concrete are given in the following table:
in order to better embody the technical effects of the present invention in preparing reactive powder concrete using high titanium slag sand as aggregate, the following are comparative examples of the above specific examples 1 to 4.
Comparative example 1:
the common active powder concrete is prepared from 61.1 parts of quartz sand, 17.4 parts of cement, 8.7 parts of fly ash, 2.8 parts of silica fume, 3.0 parts of steel fiber, 0.6 part of polycarboxylic acid water reducing agent and 6.4 parts of water by mass.
The preparation method comprises the following steps:
1) after being dried in an oven at 105 ℃, the quartz sand is crushed into particles with the particle size of less than 1.18mm in a crusher. Then the powder is sieved into three size fractions of 1.18mm-0.6mm, 0.6mm-0.3mm and 0.3mm-0.15mm for standby.
2) According to the mass parts, 61.1 parts of quartz sand, 17.4 parts of cement, 8.7 parts of fly ash, 2.8 parts of silica fume, 3.0 parts of steel fiber, 0.6 part of water reducing agent and 6.5 parts of water are mixed into powder;
3) uniformly mixing the powder and the steel fiber in the step 2, adding water, uniformly stirring, slowly adding the quartz sand obtained in the step 1, stirring, injection molding, and vibrating for compacting;
4) curing the molded sample obtained in the step 3 in an environment with the temperature of 20 ℃ and the humidity of 96% for 24 hours, and then demolding; and (4) curing the demoulded sample in a steam environment at 75 ℃ for 40h to obtain the common active powder concrete.
Comparative example 1 test results of the test specimen: the apparent density is 2300Kg/m3The flexural strength was 16.15MPa and the compressive strength was 129.33 MPa.
Comparative example 2:
the common active powder concrete is prepared from 56.5 parts of quartz sand, 20.16 parts of cement, 10.08 parts of fly ash, 3.36 parts of silica fume, 2.8 parts of steel fiber, 0.4 part of polycarboxylic acid water reducing agent and 6.7 parts of water in parts by mass.
The preparation method comprises the following steps:
1) naturally drying the quartz sand, and crushing the quartz sand into particles with the particle size of less than 1.18mm in a crusher. Then the powder is sieved into three size fractions of 1.18mm-0.6mm, 0.6mm-0.3mm and 0.3mm-0.15mm for standby.
2) Mixing 56.5 parts of quartz sand, 20.16 parts of cement, 10.08 parts of fly ash, 3.36 parts of silica fume, 2.8 parts of steel fiber, 0.4 part of water reducing agent and 6.7 parts of water by mass to obtain powder;
3) uniformly mixing the powder and the steel fiber in the step 2, adding water, uniformly stirring, slowly adding the quartz sand obtained in the step 1, stirring, injection molding, and vibrating for compacting;
4) curing the molded sample obtained in the step 3 in an environment with the temperature of 22 ℃ and the humidity of 98% for 24 hours, and then demolding; and (5) curing the demoulded sample in a hot water environment at 85 ℃ for 52 hours.
Comparative example 2 test results of the test specimens: the apparent density is 2320Kg/m3The flexural strength was 19.33MPa and the compressive strength was 131.90 MPa.
Comparative example 3:
the common active powder concrete is prepared from 54.1 parts of quartz sand, 21.30 parts of cement, 10.65 parts of fly ash, 3.55 parts of silica fume, 3.3 parts of steel fiber, 0.8 part of polycarboxylic acid water reducing agent and 6.2 parts of water in parts by mass.
The preparation method of the common reactive powder concrete comprises the following steps:
1) and (3) drying the quartz sand in an oven at 105 ℃, and crushing the quartz sand into particles with the particle size of less than 1.18mm in a crusher. Then the powder is sieved into three size fractions of 1.18mm-0.6mm, 0.6mm-0.3mm and 0.3mm-0.15mm for standby.
2) Mixing 54.1 parts of quartz sand, 21.30 parts of cement, 10.65 parts of fly ash, 3.55 parts of silica fume, 3.3 parts of steel fiber, 0.8 part of water reducing agent and 6.2 parts of water by mass to obtain powder;
3) uniformly mixing the powder and the steel fiber in the step 2, adding water, uniformly stirring, slowly adding the quartz sand obtained in the step 1, stirring, injection molding, and vibrating for compacting;
4) curing the molded sample obtained in the step 3 in an environment with the temperature of 21 ℃ and the humidity of 97% for 24 hours, and then demolding; and (4) curing the demoulded sample in a steam environment at 80 ℃ for 45 hours.
Comparative example 3 test results of test specimens: the apparent density is 2360Kg/m3The flexural strength was 24.52MPa and the compressive strength was 154.19 MPa.
Comparative example 4:
the common active powder concrete is prepared by mixing 61.4 parts of quartz sand, 18.42 parts of cement, 9.21 parts of fly ash, 3.07 parts of silica fume, 1.4 parts of steel fiber, 0.4 part of polycarboxylic acid water reducing agent and 6.1 parts of water in parts by mass.
The preparation method of the common reactive powder concrete comprises the following steps:
1) and (3) drying the quartz sand in a 105 ℃ oven or naturally drying the quartz sand, and crushing the quartz sand into particles with the particle size of less than 1.18mm in a crusher. Then the powder is sieved into three size fractions of 1.18mm-0.6mm, 0.6mm-0.3mm and 0.3mm-0.15mm for standby.
2) Weighing the original components according to the composition of 61.4 parts of quartz sand, 18.42 parts of cement, 9.21 parts of fly ash, 3.07 parts of silica fume, 1.4 parts of steel fiber, 0.4 part of water reducing agent and 6.1 parts of water in parts by mass;
3) uniformly mixing the powder and the steel fiber in the step 2, adding water, uniformly stirring, slowly adding titanium slag, stirring, injection molding, and vibrating for compacting;
4) curing the molded sample obtained in the step 3 in an environment with the temperature of 22 ℃ and the humidity of 95% for 24 hours, and then demolding; and (4) curing the demoulded sample in an autoclave environment at 82 ℃ for 48 hours.
Comparative example 4 test results of the test specimen: the apparent density is 2360Kg/m3The flexural strength was 22.56MPa, and the compressive strength was 161.43 MPa.
The general reactive powder concrete of comparative examples 1-4 and the raw material composition and the mixture ratio in the preparation method thereof are as follows:
the cementitious material in the above table refers to a mixture of cement, fly ash and silica fume.
The properties of the conventional reactive powder concrete of comparative examples 1 to 4 are as follows:
comparing the high titanium slag sand reactive powder concrete prepared by using the high titanium slag sand in the above examples 1 to 4 with the common reactive powder concrete prepared by using the quartz sand in the comparative examples 1 to 4, it was found that the reactive powder concrete prepared by using the high titanium slag sand has higher compactness, compressive strength and flexural strength, and has better mechanical properties and durability.
In conclusion, the active powder concrete is prepared by using the high-titanium slag as the aggregate, so that the cost of the active powder concrete is reduced, and the high-titanium slag is changed into valuable; the high-titanium slag sand reactive powder concrete provided by the invention is high in compressive strength and flexural strength, simple in preparation process, suitable for engineering structures such as rail transit, sponge city construction, underground pipelines and prefabricated assembly pipe galleries, and is a high-performance green building material product encouraged by the state.
Although the present invention has been described above in connection with exemplary embodiments, it will be apparent to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. The preparation method of the high-titanium slag sand reactive powder concrete is characterized by comprising the following steps of:
drying, crushing and grading the high-titanium slag to obtain graded high-titanium slag sand;
uniformly mixing cement, fly ash, silica fume and steel fiber, then adding water and a water reducing agent, and uniformly mixing to obtain slurry;
mixing the graded high-titanium slag sand with the slurry, molding and maintaining to obtain the active powder concrete, wherein,
the high-titanium slag sand, the cement, the fly ash, the silicon powder, the steel fiber, the water and the water reducing agent after grading treatment comprise the following components in parts by weight: 55 to 65 parts of high titanium slag sand, 15 to 24 parts of cement, 5 to 8 parts of fly ash, 2.5 to 4 parts of silica fume, 2 to 5.5 parts of steel fiber, 4.5 to 8.5 parts of water and 0.5 to 1.0 part of water reducing agent.
2. The method for producing high titanium slag sand reactive powder concrete according to claim 1, wherein the high titanium slag sand includes, in mass percent: TiO 2216%~23%、SiO215%~23%、CaO 17%~25%,Al2O318%~22%,MgO 6%~9%,Fe2O34%~7%。
3. The method for preparing high-titanium slag sand reactive powder concrete according to claim 1, wherein the grading treatment comprises the following components in parts by mass: 35 to 45 portions of high titanium slag with the grain diameter of 1.18 to 0.6mm, 30 to 45 portions of high titanium slag with the grain diameter of 0.6 to 0.3mm, and 15 to 25 portions of high titanium slag with the grain diameter of 0.3 to 0.15 mm.
4. The method for preparing the high-titanium slag sand reactive powder concrete according to claim 1, wherein the curing comprises mixing the high-titanium slag sand and the slurry, molding, curing for 20-28 h in an environment with the temperature of 18-22 ℃ and the humidity of more than or equal to 95%, demolding, and curing for 40-52 h in a steam, boiling water or autoclaved environment with the temperature of 75-85 ℃.
5. The method for preparing the high-titanium slag sand reactive powder concrete according to claim 1, wherein the high-titanium slag sand is a particle with a particle size of less than 1.18mm after being cooled, crushed and sieved, and the loose bulk density of the high-titanium slag sand is 1350Kg/m3~1465Kg/m3The compact bulk density is 1800Kg/m3~2001Kg/m3The apparent density is 3000Kg/m3~3260Kg/m3
6. The method for preparing high-titanium slag sand reactive powder concrete according to claim 1, wherein SiO contained in the silica fume2The mass percentage is not lower than 92%.
7. The method of claim 1, wherein the fly ash has an activity index of greater than 70%.
8. The method for preparing high-titanium slag sand reactive powder concrete according to claim 1, wherein the cement is one or more of Portland cement, pozzolanic Portland cement and composite Portland cement with strength grade not lower than 42.5 MPa.
9. A high titanium slag sand reactive powder concrete, characterized in that it is prepared by the method for preparing a high titanium slag sand reactive powder concrete according to any one of claims 1 to 8.
10. The high titanium slag sand reactive powder concrete according to claim 9, wherein the high titanium slag sand reactive powder concrete is characterized in that the high titanium slag sand reactive powder concrete is formed of a high titanium slag sandThe density of the slag sand reactive powder concrete is less than or equal to 2700Kg/m3The compressive strength is more than or equal to 170MPa, and the flexural strength is more than or equal to 22 MPa.
CN201811573609.2A 2018-12-21 2018-12-21 High-titanium slag sand reactive powder concrete and preparation method thereof Pending CN111348871A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111906923A (en) * 2020-07-25 2020-11-10 北京惠诚基业工程技术有限责任公司 Production process of active powder concrete sleeper structural member
CN112830726A (en) * 2021-01-30 2021-05-25 威海瑞合铁路轨枕有限公司 Ultra-high performance concrete sleeper

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102320789A (en) * 2011-08-29 2012-01-18 四川西南交大铁路发展有限公司 High-strength active powder concrete and preparation method
CN103613345A (en) * 2013-12-05 2014-03-05 攀枝花环业冶金渣开发有限责任公司 C55-C65 high-titanium heavy-slag concrete
CN105060792A (en) * 2015-08-14 2015-11-18 黄贺明 Low-dosage steel fiber modified powder concrete
CN105601190A (en) * 2015-12-29 2016-05-25 黄贺明 Inorganic high performance fiber composite material and preparation method thereof
CN107500648A (en) * 2017-08-23 2017-12-22 上海二十冶建设有限公司 A kind of high intensity RPC and preparation method thereof
CN107540309A (en) * 2017-09-15 2018-01-05 中交武汉港湾工程设计研究院有限公司 A kind of slope-protecting prefabricated concrete concrete of iron-containing tailing and preparation method thereof
CN107935511A (en) * 2017-12-14 2018-04-20 钢城集团凉山瑞海实业有限公司 High-titanium slag pervious concrete and preparation method thereof
CN108164217A (en) * 2018-01-09 2018-06-15 郑州大学 A kind of room temperature maintenance ultra-high performance concrete and preparation method thereof

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102320789A (en) * 2011-08-29 2012-01-18 四川西南交大铁路发展有限公司 High-strength active powder concrete and preparation method
CN103613345A (en) * 2013-12-05 2014-03-05 攀枝花环业冶金渣开发有限责任公司 C55-C65 high-titanium heavy-slag concrete
CN105060792A (en) * 2015-08-14 2015-11-18 黄贺明 Low-dosage steel fiber modified powder concrete
CN105601190A (en) * 2015-12-29 2016-05-25 黄贺明 Inorganic high performance fiber composite material and preparation method thereof
CN107500648A (en) * 2017-08-23 2017-12-22 上海二十冶建设有限公司 A kind of high intensity RPC and preparation method thereof
CN107540309A (en) * 2017-09-15 2018-01-05 中交武汉港湾工程设计研究院有限公司 A kind of slope-protecting prefabricated concrete concrete of iron-containing tailing and preparation method thereof
CN107935511A (en) * 2017-12-14 2018-04-20 钢城集团凉山瑞海实业有限公司 High-titanium slag pervious concrete and preparation method thereof
CN108164217A (en) * 2018-01-09 2018-06-15 郑州大学 A kind of room temperature maintenance ultra-high performance concrete and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
黄双华等: "《土木工程材料》", 31 August 2013 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111906923A (en) * 2020-07-25 2020-11-10 北京惠诚基业工程技术有限责任公司 Production process of active powder concrete sleeper structural member
CN112830726A (en) * 2021-01-30 2021-05-25 威海瑞合铁路轨枕有限公司 Ultra-high performance concrete sleeper

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