CN112266193A - Artificial steel slag aggregate and preparation method and application thereof - Google Patents

Artificial steel slag aggregate and preparation method and application thereof Download PDF

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Publication number
CN112266193A
CN112266193A CN202011103873.7A CN202011103873A CN112266193A CN 112266193 A CN112266193 A CN 112266193A CN 202011103873 A CN202011103873 A CN 202011103873A CN 112266193 A CN112266193 A CN 112266193A
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steel slag
aggregate
artificial
preparing
powder
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莫立武
杨硕
刘朋
邓敏
黄蓓
徐玲玲
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Nanjing Tech University
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Nanjing Tech University
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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
    • 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
    • C04B18/02Agglomerated materials, e.g. artificial aggregates
    • C04B18/021Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
    • 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
    • C04B18/142Steelmaking slags, converter slags
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Civil Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Processing Of Solid Wastes (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

Grinding steelmaking tailings by using a ball mill to obtain uniform steel slag powder; weighing portland cement, fine admixture powder and steel slag powder, and uniformly mixing to obtain an aggregate raw material; step three, preparing an additive aqueous solution; putting the aggregate raw material into a pelletizer, and uniformly spraying the additive aqueous solution prepared in the step three to pelletize to obtain the spherical artificial steel slag aggregate; putting the balled aggregate into a closed environment or a natural environment for pre-curing; and step six, putting the pre-cured aggregate into a carbonization device for carbonization treatment, and finally preparing the artificial steel slag aggregate. The artificial steel slag aggregate prepared by the method can achieve the aim of safe and high-strength aggregate, the crushing index of the aggregate can reach 9.26 percent, and the crushing index reaches the use standard of I-grade aggregate.

Description

Artificial steel slag aggregate and preparation method and application thereof
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to an artificial steel slag aggregate as well as a preparation method and application thereof.
Background
In the steel smelting process, 800-1500kg of steel slag as a byproduct can be produced every 1 ton of steel is produced, and the main mineral components of the steel slag comprise dicalcium silicate, calcium silicon oxide, calcium aluminum oxide and iron. The steel slag is difficult to be directly used as a building material because of complex mineral phase components and low chemical activity, and in addition, the steel slag contains a large amount of free calcium oxide and magnesium oxide, and the components can cause volume deformation in the late hydration stage and reaction expansion to cause material cracking. Because of the limitation of the two main problems, the steel slag produced in steel making is difficult to be industrially utilized, and according to reports, the accumulation amount of the steel slag in China reaches 12 hundred million tons in 2016, but the actual utilization rate of the steel slag is less than 20 percent.
China has large scale of social infrastructure, the consumption of building materials such as natural sandstone aggregate is high, and natural resources can not meet the material requirements of social development. Under the large background of the society, some patents for recycling steel slag are proposed. The patent application with the publication number of CN201510176843d discloses a steel slag concrete, and proposes that steel slag stones are used as coarse aggregates to prepare the concrete, the proportion of the steel slag stone concrete is optimized, and finally the concrete with the 28d compressive strength of 30.4-43.2MPa is obtained, and the durability of the steel slag concrete is not tested. Patent application with publication number CN201711315587 discloses a modified steel slag cement, which comprises the following raw materials: 30-40 parts of cement, 10-20 parts of modified steel slag powder, 10-20 parts of modified bagasse, 8-10 parts of silane coupling agent and 30-40 parts of water. The preparation method of the modified steel slag relates to the reaction of the steel slag and sulfuric acid, freezing and high-temperature calcination at the temperature of 600-. The 28d strength of the modified steel slag cement paste obtained in the patent can reach 49.6-66.8 MPa. The method for preparing the modified steel slag is complex, and the modification requires a sulfuric acid reaction; high and low temperature treatment; and modified bagasse, which is not favorable for environmental protection and resource saving. The patent application with the publication number of CN201910250979 discloses a steel slag modification method, which comprises the steps of firstly adding a modifier into high-temperature converter steel slag, then cooling to 600-; then mixing the pulverized steel slag, clay and quicklime according to the mass ratio of 45 (12-18) to 37-43, and uniformly stirring to obtain a mixture; and finally, calcining the mixture at the temperature of 1300-1450 ℃ for 20-30min, and cooling to room temperature to obtain the steel slag with the active cement clinker, wherein the steel slag is used for replacing 30-35% of cement molding mortar, and the 28d compressive strength can reach 60.5-61.3 MPa.
Disclosure of Invention
The technical problem to be solved is as follows: aiming at the technical problems, the invention provides the artificial steel slag aggregate and the preparation method and the application thereof, the steel slag is used for absorbing carbon dioxide, the stability problem of the steel slag is solved, the working performance of the steel slag aggregate is improved, the modifier is added to improve the carbonization efficiency of the steel slag, and the deficiency of the strength of the aggregate is made up. The modifier used in the invention is safe and pollution-free, has low price, needs 3-6 yuan modifier for producing 1t aggregate according to market price, and the obtained aggregate has high strength, good durability, no burning, low carbon and environmental protection, and the prepared concrete has excellent working performance.
The technical scheme is as follows: the preparation method of the artificial steel slag aggregate comprises the following steps: grinding the steelmaking tailings by using a ball mill to obtain uniform steel slag powder; weighing 5-15 parts by mass of portland cement, 10-40 parts by mass of fine admixture powder and 50-80 parts by mass of steel slag powder, and uniformly mixing to obtain an aggregate raw material; step three, preparing an additive aqueous solution; putting the aggregate raw material into a balling machine, and uniformly spraying the additive aqueous solution prepared in the step three to ball to obtain the spherical artificial steel slag aggregate, wherein the water-cement ratio of the orthopaedic raw material to the additive aqueous solution is 0.17-0.20; putting the balled aggregate into a closed environment or a natural environment for pre-curing; and step six, putting the pre-cured aggregate into a carbonization device for carbonization treatment, and finally preparing the artificial steel slag aggregate.
Preferably, the steel slag powder in the first step has a specific surface area of 250m2/g。
Preferably, the aggregate raw material in the second step comprises: 70-80 parts of steel slag powder, 15-20 parts of admixture fine powder and 5-10 parts of Portland cement.
Preferably, in the second step, the fine powder of the admixture is at least one of fly ash, brick fine powder and slag powder.
Preferably, the admixture is an aqueous solution with a concentration of 0.02wt.% to 3wt.% prepared from at least one of EDTA, disodium ethylenediaminetetraacetate, sodium carbonate and acetic acid.
Preferably, the water cement ratio of the orthopedic raw material to the aqueous solution of the additive in the fourth step is 0.18.
Preferably, the pre-curing time in the fifth step is 2-14 d.
Preferably, the carbonization treatment in the sixth step is performed under the following specific conditions: the concentration of the introduced carbon dioxide is 100 vol.%, the air pressure is 0.2MPa, and the carbonization time is 4 h.
The artificial steel slag aggregate prepared by the method.
The artificial steel slag aggregate is applied to the preparation of concrete.
Has the advantages that: 1) the main raw materials used in the invention are industrial solid waste, cheap industrial raw materials, carbon dioxide and the like, the waste is recycled, and the obtained aggregate has good performance and meets the use standard of the aggregate.
2) The greenhouse gas carbon dioxide is difficult to treat after being trapped, and the steel slag is used for absorbing and solidifying the carbon dioxide, so that the permanent storage of the carbon dioxide is realized, and the emission of the carbon dioxide is reduced.
3) The steel slag aggregate prepared by the invention has an excellent pore structure, the weight of the prepared steel slag aggregate concrete is reduced, and water is slowly released after the aggregate absorbs water, so that internal curing can be provided for the concrete, the later strength of the concrete is improved, and the early volume shrinkage of the concrete is slowed, as shown in figure 6.
4) The invention uses the admixture to improve the carbonization efficiency of the steel slag aggregate and improve the strength of the carbonized aggregate and the hydration degree of the carbonized aggregate. Compared with the concrete with the carbonized steel slag aggregate, the concrete prepared by using the additive to strengthen the carbonized steel slag aggregate has the advantages that the 28d compressive strength is improved by 12.4MPa, and the stability is better.
5) The preparation process of the recycled aggregate prepared by the invention is simple, no pollutant is generated in the preparation process, the sintering is avoided, and the energy-saving and environment-friendly effects are achieved.
According to the invention, steel slag is carbonized, and carbon dioxide can react with dicalcium silicate, calcium oxide, calcium hydroxide and the like in the steel slag to obtain calcium carbonate, so that the gelling activity of the steel slag is excited, unstable components are consumed, and the strength of the aggregate is improved. The steel slag aggregate is modified by the additive during molding, the steel slag contains a large amount of calcium silicon oxide with low carbonization and hydration activity, and the additive can promote the precipitation of calcium from a low-activity mineral phase, is beneficial to the contact of calcium and carbon dioxide and improves the carbonization efficiency. Part of free calcium oxide in the steel slag is wrapped in a low-activity ore phase, and the free calcium oxide in the ore phase after calcium precipitation is easy to migrate and react with carbon dioxide, so that the stability of the steel slag is improved. The recycled aggregate prepared by the method has good mechanical property and excellent internal pore structure, reduces the concrete shrinkage in the early stage, enhances the hydration degree of the concrete in the later stage, and improves the strength of the concrete in the later stage. Under the double conditions that environmental building materials are more and more emphasized and natural resources are seriously deficient, the use of the carbonized steel slag aggregate reinforced by the additive can relieve the contradiction between the insufficient supply of the natural aggregate caused by environmental protection and the urgent need for development of social infrastructure.
Drawings
FIG. 1 is a flow chart of the preparation process of the admixture reinforced artificial steel slag recycled aggregate of the present invention;
FIG. 2 is a reinforced carbonized steel slag aggregate prepared in example 1;
FIG. 3 is a schematic view of the aggregate of example 1 after autoclaving;
FIG. 4 is a morphology chart of comparative example 3 after autoclaving aggregate;
FIG. 5 is a graph showing the compressive strength of concrete obtained by forming the aggregates of examples 1 and 5 and comparative examples 1 and 3;
FIG. 6 is a schematic diagram showing the self-contraction deformation of concrete obtained by molding the aggregates of examples 1, 2 and 5 and comparative examples 1 and 3;
FIG. 7 is a back-scattered electron image of the aggregate of example 1.
Detailed Description
The invention is further described below with reference to the accompanying drawings and specific embodiments.
Example 1
An artificial steel slag recycled aggregate reinforced by additives, referring to fig. 1, the method comprises the following steps: crushing the steel-making tailings, putting the obtained crushed steel-making tailings into a mill, and grinding the crushed steel-making tailings into the steel-making tailings with the specific surface area of 250m2Weighing and mixing 80 parts by mass of steel slag powder, 5 parts by mass of portland cement and 15 parts by mass of fly ash. Preparing a single-component additive water solution with the EDTA mass ratio of 0.146 wt.%. Adding an additive aqueous solution into the mixture by using a granulator according to the mass water-cement ratio of 0.18 to form balls, thus obtaining spherical artificial steel slag aggregates with the diameter of 9-31.5mm, wherein the appearance of the spherical artificial steel slag aggregates is shown in figure 2; and then pre-curing the obtained spherical steel slag aggregate for 4d under the conditions that the relative humidity is 50% and the temperature is 20 ℃. After the curing is finished, the spherical steel slag aggregate with the carbonized pre-structure is placed into a carbonization kettle, carbon dioxide with the concentration of 99.9 vol.% is introduced, the spherical steel slag aggregate is carbonized for 4 hours under the pressure of 0.2MPa, and the appearance of the aggregate is shown in figure 1. The aggregate is used for molding concrete to obtain the carbonized steel slag aggregate concrete, and the mixing proportion of the concrete is shown in table 1.
The appearance of the aggregate obtained by autoclaving the aggregate prepared in the embodiment at the temperature of 216 ℃ under the pressure of 2.0MPa is shown in figure 3, and the carbonized steel slag aggregate is intact without breakage after autoclaving.
Example 2
An additive-reinforced artificial steel slag recycled aggregate, the method comprising the steps of: crushing the steel-making tailings, putting the obtained crushed steel-making tailings into a mill, and grinding the crushed steel-making tailings into the steel-making tailings with the specific surface area of 250m2Weighing 80 parts by mass of steel slag powder, 5 parts by mass of portland cement and 15 parts by mass of brick fine powder, and mixing. Preparing a single-component additive water solution with the EDTA mass ratio of 0.292 wt.%. Mixing with a granulator at a mass water-cement ratio of 0.18Adding an additive aqueous solution into the materials to form balls, and obtaining spherical artificial steel slag aggregate with the diameter of 9-31.5 mm; and then, pre-curing the obtained spherical steel slag aggregate for 3d under the conditions that the relative humidity is 50% and the temperature is 20 ℃. After the maintenance is finished, the spherical steel slag aggregate with the carbonized pre-structure is placed in a carbonization kettle, carbon dioxide with the concentration of 99.9 vol.% is introduced, the mixture is carbonized for 3 hours under the pressure of 0.2MPa to obtain artificial steel slag aggregate, the aggregate is used for forming concrete, and carbonized steel slag aggregate concrete is obtained, wherein the mixing ratio of the concrete is shown in table 1.
Example 3
An additive-reinforced artificial steel slag recycled aggregate, the method comprising the steps of: crushing the steel-making tailings, putting the obtained crushed steel-making tailings into a mill, and grinding the crushed steel-making tailings into the steel-making tailings with the specific surface area of 250m2Weighing 70 parts by mass of steel slag powder, 10 parts by mass of portland cement and 20 parts by mass of fly ash, and mixing. A single admixture aqueous solution having an acetic acid mass ratio of 0.1 wt.% was prepared. Adding an additive aqueous solution into the mixture by using a granulator according to the mass water-cement ratio of 0.18 to form balls, thereby obtaining spherical artificial steel slag aggregate with the diameter of 9-31.5 mm; and then, pre-curing the obtained spherical steel slag aggregate for 3d under the conditions that the relative humidity is 50% and the temperature is 20 ℃. After the maintenance is finished, the spherical steel slag aggregate with the carbonized pre-structure is placed in a carbonization kettle, carbon dioxide with the concentration of 99.9 vol.% is introduced, the mixture is carbonized for 3 hours under the pressure of 0.2MPa to obtain artificial steel slag aggregate, the aggregate is used for forming concrete, and carbonized steel slag aggregate concrete is obtained, wherein the mixing ratio of the concrete is shown in table 1.
Example 4
An additive-reinforced artificial steel slag recycled aggregate, the method comprising the steps of: crushing the steel-making tailings, putting the obtained crushed steel-making tailings into a mill, and grinding the crushed steel-making tailings into the steel-making tailings with the specific surface area of 250m2And/g of steel slag powder, weighing 70 parts by mass of steel slag powder, 10 parts by mass of portland cement and 20 parts by mass of brick fine powder, and mixing. A single admixture aqueous solution with an EDTA mass ratio of 0.146 wt.% was prepared. Adding an additive aqueous solution into the mixture by using a granulator according to the mass water-cement ratio of 0.18 to form balls, thereby obtaining spherical artificial steel slag aggregate with the diameter of 9-31.5 mm; then at a relative humidity of 50%,and pre-curing the obtained spherical steel slag aggregate for 7 days at the temperature of 20 ℃. After the maintenance is finished, the spherical steel slag aggregate with the carbonized pre-structure is placed in a carbonization kettle, carbon dioxide with the concentration of 99.9 vol.% is introduced, the mixture is carbonized for 3 hours under the pressure of 0.2MPa to obtain artificial steel slag aggregate, the aggregate is used for forming concrete, and carbonized steel slag aggregate concrete is obtained, wherein the mixing ratio of the concrete is shown in table 1.
Example 5
An additive-reinforced artificial steel slag recycled aggregate, the method comprising the steps of: crushing the steel-making tailings, putting the obtained crushed steel-making tailings into a mill, and grinding the crushed steel-making tailings into the steel-making tailings with the specific surface area of 250m2Weighing and mixing 80 parts by mass of steel slag powder, 5 parts by mass of portland cement and 15 parts by mass of muck powder. Preparing a composite admixture water solution with the mass ratio of EDTA being 0.146 wt% and the mass ratio of acetic acid being 0.5 wt%. Adding an additive aqueous solution into the mixture by using a granulator according to the mass water-cement ratio of 0.18 to form balls, thereby obtaining spherical artificial steel slag aggregates; and then pre-curing the obtained spherical steel slag aggregate for 14d under the conditions that the relative humidity is 50% and the temperature is 20 ℃. After the maintenance is finished, the spherical steel slag aggregate with the carbonized pre-structure is placed in a carbonization kettle, carbon dioxide with the concentration of 99.9 vol.% is introduced, the mixture is carbonized for 12 hours under the pressure of 0.2MPa to obtain artificial steel slag aggregate, the aggregate is used for forming concrete, and carbonized steel slag aggregate concrete is obtained, wherein the mixing ratio of the concrete is shown in table 1.
Example 6
An additive-reinforced artificial steel slag recycled aggregate, the method comprising the steps of: crushing the steel-making tailings, putting the obtained crushed steel-making tailings into a mill, and grinding the crushed steel-making tailings into the steel-making tailings with the specific surface area of 250m2Weighing and mixing 50 parts by mass of steel slag powder, 10 parts by mass of portland cement and 40 parts by mass of brick fine powder. A single admixture aqueous solution with an EDTA mass ratio of 0.146 wt.% was prepared. Adding an additive aqueous solution into the mixture by using a granulator according to the mass water-cement ratio of 0.18 to form balls, thereby obtaining spherical artificial steel slag aggregates; and then, pre-curing the obtained spherical steel slag aggregate for 3d under the conditions that the relative humidity is 50% and the temperature is 20 ℃. After the curing is finished, the carbon will be containedThe spherical steel slag aggregate with the pre-structure is put into a carbonization kettle, carbon dioxide with the concentration of 99.9 vol.% is introduced, the mixture is carbonized for 2 hours under the pressure of 0.4MPa to obtain artificial steel slag aggregate, the aggregate is used for forming concrete to obtain carbonized steel slag aggregate concrete, and the mixing proportion of the concrete is shown in table 1.
Example 7
An additive-reinforced artificial steel slag recycled aggregate, the method comprising the steps of: crushing the steel-making tailings, putting the obtained crushed steel-making tailings into a mill, and grinding the crushed steel-making tailings into the steel-making tailings with the specific surface area of 250m2Weighing 70 parts by mass of steel slag powder, 15 parts by mass of Portland cement and 15 parts by mass of muck powder, and mixing. Preparing a single-component additive water solution with the EDTA mass ratio of 0.292 wt.%. Adding an additive aqueous solution into the mixture by using a granulator according to the mass water-cement ratio of 0.18 to form balls, thereby obtaining spherical artificial steel slag aggregates; and then, pre-curing the obtained spherical steel slag aggregate for 7d under the conditions that the relative humidity is 50% and the temperature is 20 ℃. After curing, the spherical steel slag aggregate with the carbonized pre-structure is placed in a carbonization kettle, carbon dioxide with the concentration of 20 vol.% is introduced, carbonization is carried out for 24 hours under the pressure of 0.01MPa, the artificial steel slag aggregate is obtained, concrete is formed by using the aggregate, and the carbonized steel slag aggregate concrete is obtained, wherein the mixing ratio of the concrete is shown in table 1.
Example 8
An additive-reinforced artificial steel slag recycled aggregate, the method comprising the steps of: crushing the steel-making tailings, putting the obtained crushed steel-making tailings into a mill, and grinding the crushed steel-making tailings into the steel-making tailings with the specific surface area of 250m2And/g of steel slag powder, weighing 70 parts by mass of steel slag powder, 10 parts by mass of portland cement and 20 parts by mass of brick fine powder, and mixing. Preparing a compound additive water solution with the mass ratio of the ethylene diamine tetraacetic acid disodium being 1 wt.% and the mass ratio of the sodium carbonate being 2 wt.%. Adding an additive aqueous solution into the mixture by using a granulator according to the mass water-cement ratio of 0.18 to form balls, thereby obtaining spherical artificial steel slag aggregate with the diameter of 9-31.5 mm; and then, pre-curing the obtained spherical steel slag aggregate for 7d under the conditions that the relative humidity is 50% and the temperature is 20 ℃. After the curing is finished, the spherical steel slag aggregate with the carbonized pre-structure is put into a carbonization kettle, and 99.9vol is introduced.The percent concentration of carbon dioxide is carbonized for 3 hours under the pressure of 0.2MPa to obtain the artificial steel slag aggregate, and the aggregate is used for forming concrete to obtain the carbonized steel slag aggregate concrete, and the mixing proportion of the concrete is shown in Table 1.
Comparative example 1
The particle size range of common natural limestone aggregate is 9-31.5mm, and the aggregate is used for forming concrete, and the mixture ratio is shown in table 1.
Comparative example 2
A steel slag recycled aggregate, which comprises the following steps: crushing the steel-making tailings, putting the obtained crushed steel-making tailings into a mill, and grinding the crushed steel-making tailings into the steel-making tailings with the specific surface area of 250m2Weighing and mixing 80 parts by mass of steel slag powder, 5 parts by mass of portland cement and 15 parts by mass of fly ash. Adding water into the mixture by a granulator according to the mass water-cement ratio of 0.18 to form balls, and obtaining the ball-shaped steel slag aggregate; then, the spherical steel slag aggregate obtained above was cured at 20 ℃ under a relative humidity of 50% for 14 d.
Comparative example 3
A carbonized steel slag recycled aggregate, which comprises the following steps: crushing the steel-making tailings, putting the obtained crushed steel-making tailings into a mill, and grinding the crushed steel-making tailings into the steel-making tailings with the specific surface area of 250m2Weighing 70 parts by mass of steel slag powder, 15 parts by mass of portland cement and 15 parts by mass of fly ash, and mixing. Adding water into the mixture by a granulator according to the mass water-cement ratio of 0.18 to form balls, and obtaining the ball-shaped steel slag aggregate; and then pre-curing the obtained spherical steel slag aggregate for 4d under the conditions that the relative humidity is 50% and the temperature is 20 ℃. After curing, the spherical steel slag aggregate with the carbonized pre-structure is placed in a carbonization kettle, carbon dioxide with the concentration of 99.9 vol.% is introduced, carbonization is carried out for 8 hours under the pressure of 0.2MPa, the carbonized steel slag aggregate is obtained, and concrete is formed by using the aggregate, wherein the mixing proportion of the concrete is shown in table 1.
The ordinary portland cement of the invention is PII 52.5 cement, steel slag is steel-making tailings, fly ash is grade II fly ash, slag soil powder and brick fine powder are solid wastes, and the water reducing agent is carboxylic acid water reducing agent. The concrete mixing ratio in each example is shown in Table 1.
TABLE 1 mixing ratio of one cubic meter of concrete/kg
Figure BDA0002726307610000071
The aggregates prepared in examples 1 to 4 and comparative examples 1 to 3 were subjected to a performance test, the crushing index being determined according to the method in GB/T14685-2011 and the water absorption being determined with reference to the standard JTG E42-2005. See table 2 for specific test results.
TABLE 2 Properties of the aggregates prepared in examples 1 to 4 and comparative examples 1 to 3
Figure BDA0002726307610000072
In Table 2, the aggregate prepared in example 1 and comparative example 3 was prepared in the same ratio, and the aggregate of example 1 was treated with an additive. The crushing value of the aggregate treated by the additive is reduced by 6.68 percent, according to the specification of the standard GB/T14685-2011 on pebble-shaped aggregate, the crushing value of the original carbonized aggregate cannot meet the requirement of the lowest grade III aggregate, and the strength of the carbonized aggregate treated by the additive is 2.12 percent lower than the crushing value specified by the grade I aggregate. Correspondingly, the aggregate of comparative example 3 had a more porous pore structure and a higher water absorption due to the low degree of carbonization.
Example 2 used an EDTA solution twice as concentrated as example 1, and example 2 had slightly higher water absorption and crush values than example 1, i.e., the aggregate in example two had slightly lower structural strength than example 1, indicating that the use of a solution having 0.146 wt.% EDTA mass was more efficient than a solution having 0.292 wt.% EDTA mass.
Referring to the standard GB/T750-92, the aggregate obtained in the method is shown in figure 2 by placing the example 1 in an autoclave and autoclaving the mixture for 3 hours under the conditions of the pressure of 2MPa and the temperature of 216 ℃.
FIG. 3 No broken aggregate appeared in example 1, because the aggregate of example 1 treated with EDTA had a low f-CaO content, EDTA increased the carbonization efficiency, so that f-CaO was converted into calcium carbonate during carbonization, the strength of the aggregate was increased, and the instability factor was reduced, and FIG. 4 is an autoclaved aggregate of comparative example 1, in which carbonization did not eliminate f-CaO in the steel slag, resulting in pulverization of the autoclaved aggregate.
FIG. 5 shows the strength of concrete obtained by molding various aggregates at various ages. The concrete 28d obtained by molding in example 1 had a compressive strength 8.4MPa higher than that of comparative example 3.
The aggregate obtained by the technology belongs to porous aggregate, and the good water absorption enables the aggregate to slowly release water in concrete, so that the later strength of the concrete is improved, and the volume deformation caused by the self-shrinkage of the concrete is compensated (figure 6). Giving the concrete internal curing capability.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.

Claims (10)

1. The preparation method of the artificial steel slag aggregate is characterized by comprising the following steps:
grinding the steelmaking tailings by using a ball mill to obtain uniform steel slag powder;
weighing 5-15 parts by mass of portland cement, 10-40 parts by mass of fine admixture powder and 50-80 parts by mass of steel slag powder, and uniformly mixing to obtain an aggregate raw material;
step three, preparing an additive aqueous solution;
putting the aggregate raw material into a balling machine, and uniformly spraying the additive aqueous solution prepared in the step three to ball to obtain the spherical artificial steel slag aggregate, wherein the water-cement ratio of the orthopaedic raw material to the additive aqueous solution is 0.17-0.20;
putting the balled aggregate into a closed environment or a natural environment for pre-curing;
and step six, putting the pre-cured aggregate into a carbonization device for carbonization treatment, and finally preparing the artificial steel slag aggregate.
2. Root of herbaceous plantThe method for preparing artificial steel slag aggregate as claimed in claim 1, wherein the steel slag powder in the first step has a specific surface area of 250m2/g。
3. The method for preparing the artificial steel slag aggregate according to claim 1, wherein the aggregate raw material in the second step comprises: 70-80 parts of steel slag powder, 15-20 parts of admixture fine powder and 5-10 parts of Portland cement.
4. The method for preparing the artificial steel slag aggregate according to claim 1, wherein the admixture fine powder in the second step is at least one of fly ash, brick fine powder and slag powder.
5. The method for preparing the artificial steel slag aggregate according to claim 1, wherein the admixture is an aqueous solution prepared from at least one of EDTA, disodium ethylene diamine tetraacetate, sodium carbonate and acetic acid, and the concentration of the aqueous solution is 0.02wt.% to 3 wt.%.
6. The method for preparing artificial steel slag aggregate according to claim 1, wherein the water-cement ratio of the aqueous solution of the orthopedic raw material and the additive in the fourth step is 0.18.
7. The method for preparing artificial steel slag aggregate according to claim 1, wherein the pre-curing time in the fifth step is 2-14 days.
8. The method for preparing the artificial steel slag aggregate according to claim 1, wherein the carbonization treatment in the sixth step is carried out under the following specific conditions: the concentration of the introduced carbon dioxide is 100 vol.%, the air pressure is 0.2MPa, and the carbonization time is 4 h.
9. The artificial steel slag aggregate prepared by the method of any one of claims 1 to 8.
10. Use of the artificial steel slag aggregate of claim 9 in the preparation of concrete.
CN202011103873.7A 2020-10-15 2020-10-15 Artificial steel slag aggregate and preparation method and application thereof Pending CN112266193A (en)

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CN113072311A (en) * 2021-05-10 2021-07-06 南京工业大学 Steel slag auxiliary cementing material and preparation method and application thereof
CN113636772A (en) * 2021-08-12 2021-11-12 福建源鑫环保科技有限公司 Steel slag-based heat-insulating filler and preparation method and application thereof
CN113636772B (en) * 2021-08-12 2022-10-25 福建源鑫环保科技有限公司 Steel slag-based heat-insulating filler and preparation method and application thereof
CN114538849A (en) * 2022-03-08 2022-05-27 沈阳建筑大学 Preparation process of steel slag-based water permeable brick cured by hydration-carbonization coupling system and steel slag-based carbonized water permeable brick
CN114956729A (en) * 2022-05-24 2022-08-30 山东汉博昱洲新材料有限公司 Pouring type plate capable of degrading gaseous pollutants as well as preparation method and application of pouring type plate
CN115124308A (en) * 2022-07-12 2022-09-30 山东汉博昱洲新材料有限公司 Porous aggregate, plate and preparation method thereof
CN115259712A (en) * 2022-08-31 2022-11-01 霖和气候科技(北京)有限公司 Preparation method of high-solid waste base-converged carbonized baking-free lightweight aggregate
CN115353341A (en) * 2022-09-21 2022-11-18 山东京韵泰博新材料科技有限公司 Preparation method and application of novel raw material for pouring system
CN116375377A (en) * 2023-03-15 2023-07-04 华润水泥技术研发有限公司 Artificial aggregate and preparation method thereof
CN118026641A (en) * 2024-04-09 2024-05-14 天津冶建特种材料有限公司 Tailing-based artificial aggregate and preparation method thereof
CN118026641B (en) * 2024-04-09 2024-06-11 天津冶建特种材料有限公司 Tailing-based artificial aggregate and preparation method thereof

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Application publication date: 20210126