CN113772982A - Composite sand for concrete, premixed concrete and preparation method thereof - Google Patents
Composite sand for concrete, premixed concrete and preparation method thereof Download PDFInfo
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- CN113772982A CN113772982A CN202111032739.7A CN202111032739A CN113772982A CN 113772982 A CN113772982 A CN 113772982A CN 202111032739 A CN202111032739 A CN 202111032739A CN 113772982 A CN113772982 A CN 113772982A
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- 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
- 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
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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
- C04B18/00—Use 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
- C04B18/04—Waste materials; Refuse
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
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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
Abstract
The invention provides composite sand for concrete, premixed concrete and a preparation method thereof, wherein the composite sand for concrete comprises wind-water quenched vanadium-titanium slag and iron tailing sand in a volume ratio of (15:85) - (55:45), wherein the wind-water quenched vanadium-titanium slag is slag obtained by treating molten blast furnace slag produced by iron making by taking vanadium-titanium magnetite as a raw material through a wind-water quenching process. According to the invention, the wind-water quenched vanadium-titanium slag and the iron tailing sand are compounded, so that the common medium sand for concrete with all indexes meeting the conditions can be obtained, a new choice is provided for the sand for concrete, a new path is provided for large-scale efficient utilization of the vanadium-titanium slag and the iron tailing sand, and important contribution is made to environmental protection.
Description
Technical Field
The invention relates to the field of building materials, in particular to composite sand for concrete, premixed concrete and a preparation method thereof.
Background
The generalized concrete is an artificial stone prepared from a cementing material, coarse and fine aggregates, water and other additives according to a proper proportion. The most widely used concrete is common concrete, namely cement concrete prepared by taking cement as a cementing material and sand and stone as aggregate and adding water for stirring.
The sand, i.e. fine aggregate, is generally natural sand which is a mixture of different mineral particles of different sizes formed after the weathering of rocks, and river sand, sea sand and mountain sand are commonly used. However, with the enhancement of the awareness of protecting natural resources of people, the exploitation of natural sand is greatly reduced in the construction industry, and solid wastes with certain particle sizes are mostly used as fine aggregates. The technology of applying the iron tailings to the concrete fine aggregate is mature, but the apparent density of the iron tailings is usually 3100kg/m3This results in an excessive bulk weight of the concrete (2500 kg/m or more)3) And the iron tailing sand in a natural state is usually small in fineness modulus, is fine sand and extra-fine sand, and can be used as building sand after being adjusted in gradation, so that the industrial application of the iron tailing sand is restricted.
In the prior art, most of the waste rocks are used in combination after being crushed, but the method can not basically solve the problems that the single concrete has high volume weight, the fresh concrete is easy to separate due to heavy sand ratio and the like.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides composite sand for concrete, premixed concrete and a preparation method thereof.
In a first aspect, the invention provides composite sand for concrete, which comprises wind-water quenched vanadium-titanium slag and iron tailing sand in a volume ratio of (15:85) - (55:45), wherein the wind-water quenched vanadium-titanium slag is slag obtained by treating molten blast furnace slag produced by iron making by taking vanadium-titanium magnetite as a raw material through a wind-water quenching process.
The vanadium-titanium slag is waste slag generated in blast furnace ironmaking by using vanadium-titanium magnetite as a raw material. The production of 0.3-0.6 t of waste slag per ton of iron, the lower the grade of iron ore, the larger the amount of slag discharge generally. The grade of titanium in the vanadium-titanium slag is not high enough, generally lower than 20%, and the titanium-containing mineral has complex embedding relation, so that the vanadium-titanium slag is not suitable for being used as an industrial raw material for extracting titanium. In addition, TiO in the vanadium-titanium slag is compared with the ordinary slag2The content is high, and the non-aqueous hard active perovskite exists, so that the silicon-oxygen tetrahedral vitreous body of the vanadium-titanium slag vitreous body has high polymerization degree, large crystal-glass ratio, low activity and poor grindability, and the large-scale utilization of the vanadium-titanium slag vitreous body is greatly limited. Therefore, at present, except that part of heavy slag is used as sandstone aggregate and the cost is higher, a large amount of vanadium-titanium slag is still in a stockpiling state, which not only occupies a large amount of land, but also causes resource waste and environmental pollution, and increases the cost of land occupation and environmental management for production enterprises.
The research of the invention finds that the water consumption of the wind-water quenching vanadium-titanium slag is more than 3 times less than that of the water quenching process during quenching, so that the cooling speed of the high-temperature molten slag is slower, and the content of the formed glass body is relatively lower. After high-temperature slag is subjected to high-pressure air quenching treatment, the air-water quenched vanadium-titanium slag is mostly spherical particles, the surface and the interior of the slag are provided with more pores, the interior of the slag is provided with more closed pores, and the apparent density of the slag is 2400-2500 kg/m3The bulk density is 1100-1300 kg/m3The medium sand for the ordinary concrete which meets the conditions can be obtained by compounding the wind-water quenched vanadium-titanium slag and the iron tailing sand, not only provides a new choice for the sand for the concrete, but also provides large-scale efficient medium sand for the vanadium-titanium slag and the iron tailing sandThe new path is provided, and multiple purposes are achieved.
Further, the wind-water quenching process conditions comprise: firstly, adopting air quenching, wherein the air pressure of the quenching slag is 0.2-0.4 MPa, and the air quantity is 100-150 m3Min, controlling the air quantity to be 35-50 times of the slag output quantity; and then water quenching is adopted, the water pressure is 0.2-0.3 MPa, and the water amount is 1-2 times of the slag output amount.
Further, the particle size of the wind-water quenched vanadium-titanium slag is 0.075-10 mm. By selecting the particle size range, the reasonable grading of the composite sand can be realized on the basis of ensuring that the wind-water quenched vanadium-titanium slag has fewer overall defects, the indexes such as apparent density, crushing value and the like meet the requirements of relevant standards, wherein the particle size ratio in the 5-10 mm interval is less than 0.5%, the particle shape is good, the particles with the particle size can be reserved, the powder with the particle size of less than 0.075mm is used as slag powder for high added value utilization, and the overall utilization rate and the economic benefit are improved.
Further, the wind-water quenched vanadium-titanium slag has an element composition of TiO2:2％～10％，Fe2O3：0～1.5％，CaO+MgO+SiO2+Al2O3:78％～87％，Cl-＜0.06％。
Further, the vitreous body content of the wind-water quenched vanadium-titanium slag is 90-97%.
The wind-water quenched vanadium-titanium slag under the chemical composition and glass content conditions has a proper amount of crystal phase in the glass, has the characteristics similar to microcrystalline glass, and can improve the physical properties of the vanadium-titanium slag and reduce the content of harmful substances.
Further, the iron tailing sand is iron tailing fine sand with fineness modulus of 1.6-2.2 generated by mineral separation. The fineness modulus of the iron tailing sand used independently is smaller, and after reasonable compounding, the fineness modulus of the obtained composite sand reaches 2.6-3.0.
Further preferably, the composite sand comprises wind-water quenched vanadium-titanium slag and iron tailing sand in a volume ratio of 45: 55.
In a preferred embodiment of the invention, the composite sand consists of the following components in percentage by volume: 45 percent of wind-water quenched vanadium-titanium slag and 55 percent of iron tailing sand. The fineness modulus of the composite sand under the mixture ratio is 2.7.
It should be noted that if other qualified sand for concrete (e.g., natural sand) is still present in the enterprise or construction site, the composite sand of the present invention may be mixed with the sand for concrete.
In a second aspect, the invention also provides application of the composite sand for concrete in preparing common concrete. Wherein the composite sand is used as fine aggregate.
Specifically, the invention provides premixed concrete, which comprises the composite sand for concrete, coarse aggregate, a cementing material, water, an additive and a mineral admixture as required.
The composite sand is medium sand with reasonable gradation meeting the requirements of related standards, and is used in concrete as fine aggregate, wherein holes on the surfaces of the wind-water quenched vanadium-titanium slag particles can be tightly combined with a cementing material, so that the interface combination degree is improved, and meanwhile, holes inside the wind-water quenched vanadium-titanium slag particles can be completely reserved, so that the volume weight of the concrete is effectively reduced, the premixed concrete with better performance indexes in all aspects is obtained, the problem of larger self weight of a concrete structure caused by using a large amount of iron tailing sand at present is solved, and the large-scale efficient utilization of the vanadium-titanium slag and the iron tailing sand is also realized.
The invention also provides a preparation method of the premixed concrete, which comprises the following steps: and adjusting the composite sand to a saturated surface dry state, and mixing the composite sand with coarse aggregate, a cementing material and water to prepare the composite sand. If necessary, a certain amount of additive and mineral admixture can be added.
In the above preparation method, the specific operation of adjusting to the saturated dry noodle state may be: the composite sand is mixed with proper amount of water and/or excess water is deducted to reach a saturated surface dry state during concrete trial preparation.
The invention carries out the treatment on the composite sand, is more beneficial to controlling the working performance of fresh concrete and preventing the working performance of the concrete from being degraded due to water absorption of the composite sand, thereby preparing the premixed concrete with performance indexes meeting the design requirements and further preparing the qualified concrete product.
The invention provides composite sand for concrete, premixed concrete and a preparation method thereof, wherein the wind-water quenched vanadium-titanium slag and iron tailing sand are compounded to obtain the medium sand for the common concrete with all indexes meeting the conditions, so that a new choice is provided for the sand for the concrete, a new path is provided for large-scale efficient utilization of the vanadium-titanium slag and the iron tailing sand, and the preparation method has important contribution to environmental protection.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The raw materials and auxiliary materials used in the following examples are all commercially available unless otherwise specified.
The performance of the composite sand in the following examples is tested according to the Standard of the quality and inspection methods for construction sands (GB/T14684) or ordinary concrete sands and stones (JGJ 52);
the performance of the concrete is detected according to the standard of the test method for the performance of the mixture of the common concrete (GB/T50080), the standard of the test method for the mechanical property of the common concrete (GB/T50081) and the standard of the test method for the long-term performance and the durability of the common concrete (GB/T50082).
The coarse aggregate, cementitious material and admixture used in the preparation of the C40 strength grade concrete in the following examples were the same.
Example 1
The embodiment provides composite sand for concrete, which comprises the following components in percentage by volume: 45 percent of wind-water quenched vanadium-titanium slag and 55 percent of iron tailing sand.
The air-water quenching vanadium-titanium slag is obtained by treating molten blast furnace slag produced by iron making by taking vanadium titano-magnetite as a raw material through an air-water quenching process, and the air-water quenching process specifically comprises the following conditions: firstly, air quenching is carried out, and the blast pressure of the quenching slag0.4MPa, and 150m of air volume3Min, controlling the air quantity to be 50 times of the slag output quantity; and then water quenching is carried out, the water pressure in the water quenching process is 0.2MPa, and the water amount is 1 time of the slag discharge amount.
And (3) screening the air-water quenched vanadium-titanium slag, selecting the slag with the particle size range of 0.075-10 mm, and using the powder with the particle size of less than 0.075mm as slag powder for high value-added utilization.
The element composition of the obtained wind-water quenched vanadium-titanium slag is TiO2：11％，Fe2O3：1.3％。CaO+MgO+SiO2+Al2O3：82％，Cl-: 0.06 percent and the content of vitreous body is 89 percent.
The iron tailing sand is iron tailing fine sand with fineness modulus of 2.1 generated by mineral separation.
The fineness modulus of the composite sand obtained according to the mixture ratio is 2.7, and the apparent density is 2830kg/m3The single-stage maximum crushing index is 14 percent, meets the building sand (GB/T14684) and the quality and inspection method standard of the sand and stone for the common concrete (JGJ52), and can be used as fine aggregate of the common concrete.
The embodiment also provides premixed concrete, which comprises the raw materials of the composite sand for concrete, coarse aggregate, a cementing material, water and an additive. When the concrete is prepared, the composite sand is firstly mixed with water to reach surface saturation, and then mixed and stirred with coarse aggregate, a cementing material, water and an additive to prepare the concrete.
Specifically, the present example prepared ready-mixed concrete of strength grade C40 and tested the properties thereof. As a result, the fresh concrete had a volume weight of 2430kg/m3The slump of the concrete after leaving the machine is 220mm, the expansion degree is 520mm, the pressure bleeding rate is 32.1 percent, the 3d compressive strength of the hardened concrete is 30.7MPa, the 28d compressive strength is 54.1MPa, and the chloride ion migration coefficient at the 28d age is 2.0 multiplied by 10-12m2And/s, the carbonization depth is 8.5 mm.
Example 2
The embodiment provides composite sand for concrete, which comprises the following components in percentage by volume: 15 percent of wind-water quenched vanadium-titanium slag and 85 percent of iron tailing sand.
Wherein the air and water are quenchedThe vanadium-titanium slag is slag obtained by treating molten blast furnace slag produced by iron making by taking vanadium-titanium magnetite as a raw material through an air-water quenching process, and the air-water quenching process conditions are as follows: firstly, air quenching is carried out, the air pressure of the quenching slag is 0.2MPa, and the air quantity is 100m3Min, controlling the air quantity to be 40 times of the slag discharge quantity; and then water quenching is carried out, the water pressure in the water quenching process is 0.2MPa, and the water amount is 2 times of the slag discharge amount.
And (3) screening the air-water quenched vanadium-titanium slag, selecting the slag with the particle size range of 0.075-10 mm, and using the powder with the particle size of less than 0.075mm as slag powder for high value-added utilization.
The element composition of the obtained wind-water quenched vanadium-titanium slag is TiO2：11％，Fe2O3：1.3％。CaO+MgO+SiO2+Al2O3：82％，Cl-: 0.06 percent and the content of vitreous body is 89 percent.
The iron tailing sand is iron tailing fine sand with fineness modulus of 1.8 generated by mineral separation.
The fineness modulus of the composite sand obtained according to the mixture ratio is 2.4, and the apparent density is 2910kg/m3The maximum crushing index of the single-stage is 12 percent, meets the building sand (GB/T14684) and the quality and inspection method standard of the sand and the stone for the common concrete (JGJ52), and can be used as fine aggregate of the common concrete.
The embodiment also provides premixed concrete, which comprises the raw materials of the composite sand for concrete, coarse aggregate, a cementing material, water and an additive. When the concrete is prepared, the composite sand is firstly mixed with water to reach surface saturation, and then mixed and stirred with coarse aggregate, a cementing material, water and an additive to prepare the concrete.
Specifically, the present example prepared ready-mixed concrete of strength grade C30 and tested the properties thereof. As a result, the fresh concrete had a volume weight of 2540kg/m3The slump of the concrete after leaving the machine is 180mm, the expansion degree is 480mm, the pressure bleeding rate is 33.9 percent, the 3d compressive strength of the hardened concrete is 22.7MPa, the 28d compressive strength is 45.0MPa, and the chloride ion migration coefficient at the 28d age is 3.5 multiplied by 10-12m2And/s, the carbonization depth is 13.1 mm.
Example 3
The embodiment provides composite sand for concrete, which comprises the following components in percentage by volume: 55 percent of wind-water quenched vanadium-titanium slag and 45 percent of iron tailing sand.
The air-water quenching vanadium-titanium slag is obtained by treating molten blast furnace slag produced by iron making by taking vanadium titano-magnetite as a raw material through an air-water quenching process, and the air-water quenching process specifically comprises the following conditions: firstly, air quenching is carried out, the air pressure of the quenching slag is 0.4MPa, and the air quantity is 100m3Min, controlling the air quantity to be 45 times of the slag discharge quantity; and then water quenching is carried out, the water pressure in the water quenching process is 0.2MPa, and the water amount is 2 times of the slag discharge amount.
And (3) screening the air-water quenched vanadium-titanium slag, selecting the slag with the particle size range of 0.075-10 mm, and using the powder with the particle size of less than 0.075mm as slag powder for high value-added utilization.
The element composition of the obtained wind-water quenched vanadium-titanium slag is TiO2：11％，Fe2O3：1.3％。CaO+MgO+SiO2+Al2O3：82％，Cl-: 0.06 percent and the content of vitreous body is 89 percent.
The iron tailing sand is iron tailing fine sand with fineness modulus of 2.0 generated by mineral separation.
The fineness modulus of the composite sand obtained according to the mixture ratio is 2.8, and the apparent density is 2780kg/m3The single-stage maximum crushing index is 20 percent, meets the building sand (GB/T14684) and the quality and inspection method standard of the sand and stone for the common concrete (JGJ52), and can be used as fine aggregate of the common concrete.
The embodiment also provides premixed concrete, which comprises the raw materials of the composite sand for concrete, coarse aggregate, a cementing material, water and an additive. When the concrete is prepared, the composite sand is firstly mixed with water to reach surface saturation, and then mixed and stirred with coarse aggregate, a cementing material, water and an additive to prepare the concrete.
Specifically, the present example prepared ready-mixed concrete of strength grade C40 and tested the properties thereof. As a result, the fresh concrete had a volume weight of 2410kg/m3The slump of the concrete after leaving the machine is 220mm, the expansion degree is 520mm, the pressure bleeding rate is 36.1 percent, the 3d compressive strength of the hardened concrete is 29.7MPa, the 28d compressive strength is 51.8MPa, and the chloride ion migration in the 28d age isShift coefficient 2.5X 10-12m2And s, the carbonization depth is 11.5 mm.
Example 4
The embodiment provides composite sand for concrete, which comprises the following components in percentage by volume: 45 percent of wind-water quenched vanadium-titanium slag and 55 percent of iron tailing sand.
The air-water quenching vanadium-titanium slag is slag obtained by treating molten blast furnace slag generated by smelting vanadium-titanium magnetite in a blast furnace through an air-water quenching process, and the air-water quenching process conditions are as follows: firstly, air quenching is carried out, the air pressure of the quenching slag is 0.4MPa, and the air quantity is 150m3Min, controlling the air quantity to be 50 times of the slag output quantity; and then water quenching is carried out, the water pressure in the water quenching process is 0.2MPa, and the water amount is 1 time of the slag discharge amount.
And (3) screening the air-water quenched vanadium-titanium slag, selecting the slag with the particle size range of 0.075-10 mm, and using the powder with the particle size of less than 0.075mm as slag powder for high value-added utilization.
The element composition of the obtained wind-water quenched vanadium-titanium slag is TiO2：8％，Fe2O3：1.12％。CaO+MgO+SiO2+Al2O3：85％，Cl-: 0.02% and a vitreous body content of 93%.
The iron tailing sand is iron tailing fine sand with fineness modulus of 2.1 generated by mineral separation.
The fineness modulus of the composite sand obtained according to the mixture ratio is 2.7, and the apparent density is 2820kg/m3The maximum crushing index of the single-stage is 12 percent, meets the building sand (GB/T14684) and the quality and inspection method standard of the sand and the stone for the common concrete (JGJ52), and can be used as fine aggregate of the common concrete.
The embodiment also provides premixed concrete, which comprises the raw materials of the composite sand for concrete, coarse aggregate, a cementing material, water and an additive. When the concrete is prepared, the composite sand is firstly mixed with water to reach surface saturation, and then mixed and stirred with coarse aggregate, a cementing material, water and an additive to prepare the concrete.
Specifically, the present example prepared ready-mixed concrete of strength grade C40 and tested the properties thereof. As a result, the fresh concrete weighed 2420kg/m3The slump of the concrete after leaving the machine is 220mm, the expansion degree is 530mm, the pressure bleeding rate is 31.1 percent, the 3d compressive strength of the hardened concrete is 31.2MPa, the 28d compressive strength is 55.1MPa, and the chloride ion migration coefficient at the 28d age is 2.1 multiplied by 10-12m2And/s, the carbonization depth is 7.5 mm.
Comparative example 1
The comparative example provides composite sand for concrete, which comprises the following components in percentage by volume: 45% of vanadium-titanium slag and 55% of iron tailing sand.
The vanadium-titanium slag is slag with the particle size of less than 5mm, which is obtained by naturally cooling and mechanically crushing molten blast furnace slag produced by iron making by taking vanadium-titanium magnetite as a raw material. The particle size range of the vanadium-titanium slag is 0.075-5 mm.
The iron tailing sand is iron tailing fine sand with fineness modulus of 2.2 generated by mineral separation.
The fineness modulus of the composite sand obtained by the comparative example according to the proportion is 2.8, and the apparent density is 2950kg/m3The crush value was 18%.
The comparative example also provides premixed concrete, which comprises the composite sand for concrete, coarse aggregate, a cementing material, water and an additive. During preparation, the composite sand is mixed with coarse aggregate, a cementing material, water and an additive and stirred to prepare concrete.
Specifically, this comparative example prepared ready-mixed concrete of strength grade C40 and tested its properties. As a result, the fresh concrete weighed 2520kg/m3The slump of the concrete after leaving the machine is 170mm, the expansion degree is 420mm, the pressure bleeding rate is 37.1 percent, the 3d compressive strength of the hardened concrete is 27.7MPa, the 28d compressive strength is 49.8MPa, and the chloride ion migration coefficient at the age of 28d is 4.5 multiplied by 10-12m2And/s, the carbonization depth is 13.7 mm. The mechanical property of the concrete reaches the design requirement, but the composite sand prepared by naturally cooling the vanadium-titanium slag has no obvious effect on reducing the volume weight of the concrete.
Comparative example 2
The comparative example provides composite sand for concrete, which comprises the following components in percentage by volume: 45% of mining waste rock and 55% of iron tailing sand.
Wherein the mining waste rock is slag with the particle size of less than 5mm obtained after mechanical crushing. The selected particle size range of the crushed mining waste rock is 0.075-10 mm.
The iron tailing sand is iron tailing fine sand with fineness modulus of 2.2 generated by mineral separation.
The fineness modulus of the composite sand obtained by the comparative example according to the proportion is 2.7, and the apparent density is 3050kg/m3The crush value was 15%.
The comparative example also provides premixed concrete, which comprises the composite sand for concrete, coarse aggregate, a cementing material, water and an additive. During preparation, the composite sand is mixed with coarse aggregate, a cementing material, water and an additive and stirred to prepare concrete.
Specifically, this comparative example prepared ready-mixed concrete of strength grade C40 and tested its properties. As a result, fresh concrete has a volume weight of 2560kg/m3The slump of the concrete after leaving the machine is 180mm, the expansion degree is 480mm, the pressure bleeding rate is 34.9 percent, the 3d compressive strength of the hardened concrete is 28.7MPa, the 28d compressive strength is 52.1MPa, and the chloride ion migration coefficient at the 28d age is 11.5 multiplied by 10-12m2And/s, the carbonization depth is 14.3 mm. The mechanical property of the concrete reaches the design requirement, but the composite sand prepared by using broken mining waste rocks has no obvious effect on reducing the volume weight of the concrete and has poor durability.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The composite sand for concrete is characterized by comprising air-water quenched vanadium-titanium slag and iron tailing sand in a volume ratio of (15:85) - (55:45), wherein the air-water quenched vanadium-titanium slag is slag obtained by treating molten blast furnace slag produced by iron making by taking vanadium-titanium magnetite as a raw material through an air-water quenching process.
2. The composite sand for concrete according to claim 1, wherein the wind-water quenching process conditions include: firstly, adopting air quenching, wherein the air pressure of the quenching slag is 0.2-0.4 MPa, and the air quantity is 100-150 m3Min, controlling the air quantity to be 35-50 times of the slag output quantity; and then water quenching is adopted, the water pressure is 0.2-0.3 MPa, and the water amount is 1-2 times of the slag output amount.
3. The composite sand for concrete according to claim 2, wherein the wind-water quenched vanadium-titanium slag has a particle size of 0.075 to 10 mm.
4. The composite sand for concrete according to claim 2 or 3, wherein the wind-water-quenched vanadium-titanium slag has an elemental composition of TiO2：2％～10％，Fe2O3：0～1.5％，CaO+MgO+SiO2+Al2O3：78％～87％，Cl-＜0.06％。
5. The composite sand for concrete according to claim 4, wherein the vitreous body content of the wind-water-quenched vanadium-titanium slag is 90 to 97%.
6. The composite sand for concrete according to any one of claims 1 to 5, wherein the iron tailing sand is iron tailing fine sand produced by mineral separation and having a fineness modulus of 1.6 to 2.2.
7. The composite sand for concrete according to claim 6, wherein the composite sand consists of the following components in percentage by volume: 45 percent of wind-water quenched vanadium-titanium slag and 55 percent of iron tailing sand.
8. Use of the composite sand for concrete according to any one of claims 1 to 7 for preparing general concrete, wherein the composite sand is used as a fine aggregate.
9. A ready-mixed concrete characterized in that the raw material comprises the composite sand for concrete according to any one of claims 1 to 7.
10. The method of preparing ready-mixed concrete according to claim 9, comprising: and adjusting the composite sand to a saturated surface dry state, and mixing the composite sand with coarse aggregate, a cementing material and water to prepare the composite sand.
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| CN202111032739.7A CN113772982B (en) | 2021-09-03 | 2021-09-03 | Composite sand for concrete, premixed concrete and preparation method thereof |
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| CN116924748A (en) * | 2023-09-19 | 2023-10-24 | 北京纽维逊建筑工程技术有限公司 | Solid waste resource recycling type permeable pavement paving material and preparation method and application thereof |
| CN116924748B (en) * | 2023-09-19 | 2024-01-26 | 北京纽维逊建筑工程技术有限公司 | Solid waste resource recycling type permeable pavement paving material and preparation method and application thereof |
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