CN111995341A - Full-solid waste pavement concrete utilizing steel slag in large proportion and preparation method thereof - Google Patents
Full-solid waste pavement concrete utilizing steel slag in large proportion and preparation method thereof Download PDFInfo
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- CN111995341A CN111995341A CN202010744965.7A CN202010744965A CN111995341A CN 111995341 A CN111995341 A CN 111995341A CN 202010744965 A CN202010744965 A CN 202010744965A CN 111995341 A CN111995341 A CN 111995341A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
-
- 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
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
-
- 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
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/143—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being phosphogypsum
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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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 a full-solid waste pavement concrete utilizing steel slag in a large proportion and a preparation method thereof. According to the mass percentage, firstly, 75-90% of slag powder and 10-25% of gypsum which is a byproduct of the grinding industry are mixed uniformly to prepare a cementing material, then 10-25% of the cementing material, 13-42.5% of converter steel slag coarse aggregate with the particle size of 5-25 mm and 32.5-68% of converter steel slag fine aggregate with the particle size of less than 5mm are mixed, then 3-12.5% of water and 0.1-0.75% of water reducing agent are added, and the mixture is stirred uniformly to prepare the fully-solid waste pavement concrete. The invention prepares the all-solid waste concrete based on the double-synergistic optimization of the multiple solid waste double-salt effects by combining the grain size and the activity, solves the problems of low activity and poor stability when the converter steel slag is applied to the concrete, obviously improves the steel slag mixing amount in the all-solid waste concrete, and the prepared pavement concrete has good compressive strength, reduces the production cost of the concrete, improves the resource utilization efficiency, lightens the steel slag stacking condition and has obvious economic and environmental benefits.
Description
Technical Field
The invention relates to the field of comprehensive utilization of solid waste resources and building materials, in particular to full-solid waste pavement concrete utilizing steel slag in a large proportion and a preparation method thereof.
Background
Concrete is an indispensable building material in the engineering construction process and is also the most widely applied building material at present. However, the traditional cement concrete industry generates a great deal of energy consumption and resource waste, and the damage to the ecological environment is very serious. The metallurgical waste residue is applied to the concrete industry, so that the metallurgical solid waste which is widely piled up at present can be consumed on a large scale, the energy and resource consumption in the cement concrete production process can be saved, the concrete cost is reduced, and obvious economic benefit and environmental benefit are achieved.
The steel slag is obtained by cooling the residual slag in the steel making process, can be divided into converter steel slag, electric furnace steel slag, open-hearth steel slag and the like according to the smelting mode, and the discharge amount accounts for 15-20 percent of the yield of crude steel. In China, the utilization rate of the steel slag is low, most steel enterprises only carry out crushing and magnetic separation to recover iron and then pile the residual steel tailings, and the problems of serious land occupation and environmental pollution are caused. The mineral components of the steel slag are greatly influenced by the smelting process and mainly comprise dicalcium silicate, tricalcium silicate, RO phases (solid solution consisting of CaO, MgO, MnO and FeO), calcium aluminoferrite, free calcium oxide, free magnesium oxide, simple substance iron and the like, wherein the dicalcium silicate and the tricalcium silicate are main sources of hydration activity of the dicalcium silicate and the tricalcium silicate. Based on the weak hydration activity of the steel slag, part of cement concrete enterprises apply the steel slag to cement and concrete production after grinding, but the application level of the steel slag is still very low due to the lower activity of the steel slag.
Among the components of steel slag, the influence of free calcium oxide and free magnesium oxide on concrete is very serious. The reaction speed of the free calcium oxide and the free magnesium oxide with water is slow, and the volume expansion generated after the reaction has great harm to the volume stability of the concrete. And the hydration of slay in-process needs the excitation of alkaline substance, can digest the hydration product of free calcium oxide and free magnesium oxide in the anaphase of hydration to guarantee the volume stability of concrete, can make the anaphase intensity of concrete continuously increase simultaneously, prolong the service life of concrete.
CN101475348A discloses a method for preparing artificial fish reef concrete by using metallurgical slag as a main raw material, which comprises the steps of mixing and grinding sand, steel slag, slag and cement clinker with the particle size of less than 5mm according to the proportion of 0-20%, 10-80%, 0-80% and 10-70% to prepare a cementing material, mixing coarse sand with the particle size of more than 5mm and stones according to the proportion to prepare concrete, and then carrying out high-temperature curing to prepare the artificial fish reef. The steel slag used in the patent still needs to be ground to be used as a mineral admixture, and high-temperature curing is still needed after concrete is prepared.
CN108546055A discloses steel slag pervious concrete which is prepared by mixing ordinary portland cement, steel slag and crushed stone mixed aggregate, a water reducing agent, metakaolin, calcium carbonate powder, modified polyacrylic acid vinegar and styrene butadiene rubber emulsion combined modified sizing material and has better water permeability. However, the steel slag utilization ratio of the patent is lower, and the cost of the used cementing material is higher.
CN108083729A discloses a concrete compounded by steel slag aggregate and a preparation method thereof, wherein the steel slag aggregate, slag powder, gypsum and cement are mixed to prepare a cementing material, and sand and stones are added to prepare the concrete. However, the steel slag used in the concrete has a particle size of less than 15mm, large-particle steel slag cannot be directly utilized, the utilization rate of the steel slag is still low, and the cost of the concrete is increased when cement is used.
CN104496356A discloses a curb concrete prepared from steel slag powder and slag powder, which adopts the steel slag powder and the slagThe powder and cement form a cementing material, steel tailings and slag sand form aggregate, and water and a water reducing agent are added to prepare the concrete. The concrete adopts a great deal of metallurgical waste residues, but the steel slag powder used by the concrete still needs to be ground to 400m2/kg～500m2The steel tailings used are 5 mm-30 mm in size fraction, and the size fraction below 5mm is not directly utilized, and in addition, partial cement is used, so that the cost of concrete is increased.
CN107814536A discloses a pavement concrete for municipal construction engineering. The concrete is compounded by organic and inorganic materials, and has the performance advantages of high toughness, impact resistance, crack resistance, wear resistance, skid resistance and the like. However, the raw materials still adopt common silicate cement, amorphous dodecacalcium heptaluminate, modified emulsified asphalt, natural wollastonite powder, composite fiber, a defoaming agent, a water reducing agent, sand, stones, water and the like, and the raw materials are complex in components and high in cost.
At present, the main application technology of steel slag in China is to grind the steel slag and use the ground steel slag as a concrete cementing material, and when the steel slag is used as an aggregate, certain natural or artificial aggregate still needs to be doped, so that the utilization rate is low. In the pavement concrete technology, in order to improve the wear resistance of concrete, the cost of the concrete is also increased by adding raw materials such as modified asphalt. The steel slag is used as concrete aggregate, so that the problem that the energy consumption is increased due to the fact that the steel slag is required to be ground when the steel slag is used as a cementing material is solved, and the problem that free calcium oxide and free magnesium oxide of the steel slag aggregate are hydrated and expanded due to the fact that the granularity range of the steel slag is large is utilized.
Disclosure of Invention
The invention mainly aims to provide a full-solid waste pavement concrete using steel slag in a large proportion and a preparation method thereof, and aims to solve the following problems in the prior art:
1. the converter steel slag yield and the pile stock are large, so that the problems of land occupation, resource waste and environmental pollution are caused, and the application level of the prior art is limited;
2. in the existing steel slag concrete technology, steel slag is used as a concrete admixture, and the steel slag needs to be further ground in the application process to improve the hydration activity of the steel slag, so that the production energy consumption is increased.
3. The problem of stability when the converter steel slag is used as concrete aggregate is not effectively solved;
4. in the prior art of preparing pavement concrete by utilizing metallurgical slag, converter steel slag aggregate is not used in a large proportion.
According to the invention, the converter steel slag is used for preparing the concrete aggregate, and the double synergistic optimization of the grain size and the activity of the converter steel slag, the slag and the industrial byproduct gypsum is combined, so that the problems of strength increase of the full-solid waste pavement concrete and poor stability of the steel slag when used as the concrete aggregate are solved, meanwhile, the converter steel slag aggregate can improve the utilization rate of the converter steel slag aggregate in the concrete industry, the strength, the wear resistance and other properties of the pavement concrete are improved, and a new idea is provided for the application of the steel slag aggregate concrete.
The technical scheme adopted for realizing the above purpose of the invention is as follows:
the fully-solid waste pavement concrete utilizing the steel slag in a large proportion comprises, by mass, 10% -25% of a cementing material, 65% -85% of converter steel slag aggregate, 3% -12.5% of water and 0.1% -0.75% of a water reducing agent, wherein the cementing material comprises 75% -90% of slag powder and 10% -25% of industrial byproduct gypsum, and does not contain cement.
The converter steel slag aggregate is divided into coarse aggregate and fine aggregate, the particle size of the fine aggregate is less than 5mm, the particle size of the coarse aggregate is 5 mm-25 mm, the fine aggregate accounts for 50% -80% of the total mass of the aggregate, and the coarse aggregate accounts for 20% -50% of the total mass of the aggregate.
The volume stability of the converter steel slag aggregate meets the requirements of YB/T4228-.
The slag powder is granulated blast furnace slag powder with the density of more than or equal to 2.8g/cm, and the granulated blast furnace slag powder conforms to the S95 level of GB/T18046-2017 granulated blast furnace slag powder for cement, mortar and concrete3The specific surface area is more than or equal to 400m2The activity index of 7d is more than or equal to 70 percent and the activity index of 28d is more than or equal to 95 percent.
The industrial by-product gypsum is the industrial by-product gypsum meeting the regulation of GB/T21371-2019 'industrial by-product gypsum for cement', and specifically can be one or more of desulfurized gypsum, phosphogypsum, fluorgypsum, lemon gypsum, waste ceramic mold gypsum, titanium gypsum, mirabilite gypsum and salt gypsum; the total content of dihydrate gypsum and anhydrous gypsum in the gypsum is more than or equal to 75 percent, the content of chloride ions is less than or equal to 0.5 percent, and the pH value is more than or equal to 5.
The preparation method of the fully-solid waste pavement concrete using the steel slag in a large proportion comprises the following steps of uniformly mixing ground industrial by-product gypsum and slag powder to prepare a cementing material, and uniformly mixing the cementing material, converter steel slag aggregate and a water reducing agent with water, wherein the concrete steps are as follows:
(1) grinding the required industrial by-product gypsum, then weighing the gypsum and slag powder according to the dry basis weight percentage of 10-25% and 75-90%, and then uniformly mixing to prepare a cementing material;
(2) according to the mass percentage, 10 to 25 percent of cementing material, 13 to 42.5 percent of converter steel slag coarse aggregate, 32.5 to 68 percent of converter steel slag fine aggregate, 3 to 12.5 percent of water and 0.1 to 0.75 percent of water reducing agent are added into a stirrer, and after being uniformly stirred, the mixture is poured, molded and maintained, so that the steel slag full-solid waste pavement concrete with a large proportion can be obtained.
The water reducing agent is as follows: one of polycarboxylic acid series, naphthalene series, aminobenzene sulfonic acid series or melamine series high-efficiency water reducing agents is adopted, and key performance indexes meet the requirements of a standard high-performance water reducing agent in concrete admixture GB 8076-.
The maintenance conditions are as follows: the test block is maintained for 24 hours at the temperature of 20 +/-2 ℃ and the relative humidity of more than or equal to 95% by adopting a standard maintenance room, and then is subjected to standard maintenance to test the compressive strength at the age of 3d, 7d and 28d after demolding; after pavement paving is finished, the pavement is covered by spraying a curing agent and moisturizing at the same time or covered by moisturizing films, geotechnical felts, geotechnical cloth, gunny bags, straw curtains and the like for watering and moisturizing for 14-21 d, and low-temperature weather can be properly prolonged.
Compared with the prior art, the invention is characterized in that:
(1) the raw materials of the full-solid waste pavement concrete using the steel slag in a large proportion are completely derived from solid wastes in the metallurgical industry, and cement is not used, so that the problems of land occupation, resource waste and environmental pollution in the metallurgical industry are solved;
(2) the invention can cooperatively treat various industrial solid wastes such as slag, converter steel slag, industrial byproduct gypsum and the like, reduce the production cost of concrete and change waste into valuable;
(3) the invention utilizes the converter steel slag as the concrete aggregate, the utilization rate of the converter steel slag is higher, more converter steel slag can be consumed, and the current situation of steel slag piling is reduced;
(4) the invention solves the problem of poor stability when the converter steel slag is used as concrete aggregate;
(5) the invention solves the problem that the converter steel slag needs to be ground when being applied to concrete, reduces the energy consumption and the processing difficulty and reduces the cost;
(6) the invention fully utilizes the activity and the grain size dual optimization of the converter steel slag, the slag and the industrial byproduct gypsum, and provides a new idea and way for applying the metallurgical slag to pavement concrete.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1
The fully-solid waste pavement concrete utilizing the steel slag in a large proportion is prepared from the following raw materials in percentage by mass: 83.8 percent of slag powder, 16.2 percent of desulfurized gypsum and 560m of specific surface area of the slag powder2Kg, grinding the desulfurized gypsum into powder with the specific surface area of 400m2In terms of/kg. In the concrete, the cementing material accounts for 14.3 percent, the aggregate accounts for 78.78 percent, the water accounts for 6.51 percent and the water reducing agent accounts for 0.41 percent, wherein the coarse aggregate is converter steel slag with the thickness of 5 mm-25 mm, the fine aggregate is the converter steel slag with the thickness less than 5mm, and the water reducing agent is a solid polycarboxylic acid type high-efficiency water reducing agent.
The concrete mix is shown in the following table: (amount of concrete material used per cubic unit: kg/m)3)
The concrete test block is prepared by mixing the above raw materials in a concrete mixer, injecting into a 100mm × 100mm × 100mm mold at 20 + -5 deg.C and relative humidity not lower than 60%, and vibration molding on a concrete vibration table. And curing the molded test block for 24 hours under the standard curing conditions of the curing temperature of 20 +/-2 ℃ and the relative humidity of not less than 95%, demolding, continuously curing in a constant-temperature constant-humidity curing box at the curing temperature of 20 +/-2 ℃ and the relative humidity of not less than 95% to the age of 3d, 7d and 28d, and testing the compressive strength of the concrete for 3d, 7d and 28 d. The slump test of the concrete out of the machine is carried out according to JTG E30-2005 test Specification for road engineering cement and cement concrete.
| Inspection item | Test results |
| Slump out (mm) | 230 |
| 3d compressive Strength (MPa) | 26.5 |
| 7d compressive Strength (MPa) | 38.2 |
| 28d compressive Strength (MPa) | 50.8 |
Example 2
The fully-solid waste pavement concrete utilizing the steel slag in a large proportion is prepared from the following raw materials in percentage by mass: 75% of slag powder, 25% of desulfurized gypsum and 560m of specific surface area of the slag powder2Kg, grinding the desulfurized gypsum into powder with the specific surface area of 400m2In terms of/kg. In concrete, the binding material accounts for 2476%, 65.34% of aggregate, 9.28% of water and 0.62% of water reducing agent, wherein the coarse aggregate is converter steel slag with the thickness of 5-25 mm, the fine aggregate is converter steel slag with the thickness of less than 5mm, and the water reducing agent is a solid polycarboxylic acid type high-efficiency water reducing agent.
The concrete mix is shown in the following table: (amount of concrete material used per cubic unit: kg/m)3)
The concrete test block is prepared by mixing the above raw materials in a concrete mixer, injecting into a 100mm × 100mm × 100mm mold at 20 + -5 deg.C and relative humidity not lower than 60%, and vibration molding on a concrete vibration table. And curing the molded test block for 24 hours under the standard curing conditions of the curing temperature of 20 +/-2 ℃ and the relative humidity of not less than 95%, demolding, continuously curing in a constant-temperature constant-humidity curing box at the curing temperature of 20 +/-2 ℃ and the relative humidity of not less than 95% to the age of 3d, 7d and 28d, and testing the compressive strength of the concrete for 3d, 7d and 28 d. The slump test of the concrete out of the machine is carried out according to JTG E30-2005 test Specification for road engineering cement and cement concrete.
| Inspection item | Test results |
| Slump out (mm) | 180 |
| 3d compressive Strength (MPa) | 32.2 |
| 7d compressive Strength (MPa) | 45.3 |
| 28d compressive Strength (MPa) | 58.7 |
Example 3
The fully-solid waste pavement concrete utilizing the steel slag in a large proportion is prepared from the following raw materials in percentage by mass: 90% of slag powder, 10% of desulfurized gypsum and 560m of specific surface area of the slag powder2Kg, grinding the desulfurized gypsum into powder with the specific surface area of 400m2In terms of/kg. In the concrete, the cementing material accounts for 10.26 percent, the aggregate accounts for 84.8 percent, the water accounts for 4.79 percent, and the water reducing agent accounts for 0.15 percent, wherein the coarse aggregate is converter steel slag with the thickness of 5 mm-25 mm, the fine aggregate is converter steel slag with the thickness less than 5mm, and the water reducing agent is a solid polycarboxylic acid type high-efficiency water reducing agent.
The concrete mix is shown in the following table: (amount of concrete material used per cubic unit: kg/m)3)
The concrete test block is prepared by mixing the above raw materials in a concrete mixer, injecting into a 100mm × 100mm × 100mm mold at 20 + -5 deg.C and relative humidity not lower than 60%, and vibration molding on a concrete vibration table. And curing the molded test block for 24 hours under the standard curing conditions of the curing temperature of 20 +/-2 ℃ and the relative humidity of not less than 95%, demolding, continuously curing in a constant-temperature constant-humidity curing box at the curing temperature of 20 +/-2 ℃ and the relative humidity of not less than 95% to the age of 3d, 7d and 28d, and testing the compressive strength of the concrete for 3d, 7d and 28 d. The slump test of the concrete out of the machine is carried out according to JTG E30-2005 test Specification for road engineering cement and cement concrete.
Example 4
The fully-solid waste pavement concrete utilizing the steel slag in a large proportion is prepared from the following raw materials in percentage by mass: 86.8 percent of slag powder, 13.2 percent of desulfurized gypsum and 560m of specific surface area of the slag powder2Kg, grinding the desulfurized gypsum into powder with the specific surface area of 400m2In terms of/kg. In the concrete, the cementing material accounts for 18.15 percent, the aggregate accounts for 73.64 percent, the water accounts for 7.88 percent and the water reducing agent accounts for 0.33 percent, wherein the coarse aggregate is converter steel slag with the thickness of 5 mm-25 mm, the fine aggregate is converter steel slag with the thickness less than 5mm, and the water reducing agent is a solid polycarboxylic acid type high-efficiency water reducing agent.
The concrete mix is shown in the following table: (amount of concrete material used per cubic unit: kg/m)3)
The concrete test block is prepared by mixing the above raw materials in a concrete mixer, injecting into a 100mm × 100mm × 100mm mold at 20 + -5 deg.C and relative humidity not lower than 60%, and vibration molding on a concrete vibration table. And curing the molded test block for 24 hours under the standard curing conditions of the curing temperature of 20 +/-2 ℃ and the relative humidity of not less than 95%, demolding, continuously curing in a constant-temperature constant-humidity curing box at the curing temperature of 20 +/-2 ℃ and the relative humidity of not less than 95% to the age of 3d, 7d and 28d, and testing the compressive strength of the concrete for 3d, 7d and 28 d. The slump test of the concrete out of the machine is carried out according to JTG E30-2005 test Specification for road engineering cement and cement concrete.
Example 5
The fully-solid waste pavement concrete utilizing the steel slag in a large proportion is prepared from the following raw materials in percentage by mass: 78.1 percent of slag powder, 21.9 percent of desulfurized gypsum and 560m of specific surface area of the slag powder2Kg, grinding the desulfurized gypsum into powder with the specific surface area of 400m2In terms of/kg. In the concrete, the cementing material accounts for 21.93 percent, the aggregate accounts for 68.2 percent, the water accounts for 9.25 percent and the water reducing agent accounts for 0.62 percent, wherein the coarse aggregate is converter steel slag with the thickness of 5 mm-25 mm, the fine aggregate is converter steel slag with the thickness less than 5mm, and the water reducing agent is a solid polycarboxylic acid type high-efficiency water reducing agent.
The concrete mix is shown in the following table: (amount of concrete material used per cubic unit: kg/m)3)
The concrete test block is prepared by mixing the above raw materials in a concrete mixer, injecting into a 100mm × 100mm × 100mm mold at 20 + -5 deg.C and relative humidity not lower than 60%, and vibration molding on a concrete vibration table. And curing the molded test block for 24 hours under the standard curing conditions of the curing temperature of 20 +/-2 ℃ and the relative humidity of not less than 95%, demolding, continuously curing in a constant-temperature constant-humidity curing box at the curing temperature of 20 +/-2 ℃ and the relative humidity of not less than 95% to the age of 3d, 7d and 28d, and testing the compressive strength of the concrete for 3d, 7d and 28 d. The slump test of the concrete out of the machine is carried out according to JTG E30-2005 test Specification for road engineering cement and cement concrete.
| Inspection item | Test results |
| Slump out (mm) | 220 |
| 3d compressive Strength (MPa) | 30.2 |
| 7d compressive Strength (MPa) | 41.5 |
| 28d compressive Strength (MPa) | 53.4 |
Comparative example 1
The cement material of the common aggregate pavement concrete is prepared from the following raw materials in percentage by mass: 83.8 percent of slag powder, 16.2 percent of desulfurized gypsum and 560m of specific surface area of the slag powder2Kg, grinding the desulfurized gypsum into powder with the specific surface area of 400m2In terms of/kg. In the concrete, the cementing material accounts for 14.3 percent, the aggregate accounts for 78.78 percent, the water accounts for 6.51 percent and the water reducing agent accounts for 0.41 percent, wherein the coarse aggregate is stone with the thickness of 5mm to 25mm, the fine aggregate is river sand with the thickness less than 5mm, and the water reducing agent is a solid polycarboxylic acid type high-efficiency water reducing agent.
The concrete mix is shown in the following table: (amount of concrete material used per cubic unit: kg/m)3)
The concrete test block is prepared by mixing the above raw materials in a concrete mixer, injecting into a 100mm × 100mm × 100mm mold at 20 + -5 deg.C and relative humidity not lower than 60%, and vibration molding on a concrete vibration table. And curing the molded test block for 24 hours under the standard curing conditions of the curing temperature of 20 +/-2 ℃ and the relative humidity of not less than 95%, demolding, continuously curing in a constant-temperature constant-humidity curing box at the curing temperature of 20 +/-2 ℃ and the relative humidity of not less than 95% to the age of 3d, 7d and 28d, and testing the compressive strength of the concrete for 3d, 7d and 28 d. The slump test of the concrete out of the machine is carried out according to JTG E30-2005 test Specification for road engineering cement and cement concrete.
| Inspection item | Test results |
| Slump out (mm) | 250 |
| 3d compressive Strength (MPa) | 15.2 |
| 7d compressive Strength (MPa) | 23.3 |
| 28d compressive Strength (MPa) | 32.5 |
Compared with the fully-solid waste pavement concrete using steel slag in a large proportion, the common aggregate concrete has larger machine-out slump, but has lower strength at each age, can only meet the use requirements of partial four-grade roads, has narrower application range, consumes natural resources by adopting natural aggregate, and does not utilize a large amount of steel slag which is piled up.
Comparative example 2
The cement pavement concrete utilizing the steel slag in a large proportion is prepared from the following raw materials in percentage by mass: 50% of cement, 42% of slag powder, 8% of desulfurized gypsum and oreSlag powder specific surface area 560m2Kg, grinding the desulfurized gypsum into powder with the specific surface area of 400m2In terms of/kg. In the concrete, the cementing material accounts for 14.26 percent, the aggregate accounts for 78.82 percent, the water accounts for 6.51 percent and the water reducing agent accounts for 0.41 percent, wherein the coarse aggregate is converter steel slag with the thickness of 5 mm-25 mm, the fine aggregate is the converter steel slag with the thickness less than 5mm, and the water reducing agent is a solid polycarboxylic acid type high-efficiency water reducing agent.
The concrete mix is shown in the following table: (amount of concrete material used per cubic unit: kg/m)3)
The concrete test block is prepared by mixing the above raw materials in a concrete mixer, injecting into a 100mm × 100mm × 100mm mold at 20 + -5 deg.C and relative humidity not lower than 60%, and vibration molding on a concrete vibration table. And curing the molded test block for 24 hours under the standard curing conditions of the curing temperature of 20 +/-2 ℃ and the relative humidity of not less than 95%, demolding, continuously curing in a constant-temperature constant-humidity curing box at the curing temperature of 20 +/-2 ℃ and the relative humidity of not less than 95% to the age of 3d, 7d and 28d, and testing the compressive strength of the concrete for 3d, 7d and 28 d. The slump test of the concrete out of the machine is carried out according to JTG E30-2005 test Specification for road engineering cement and cement concrete.
| Inspection item | Test results |
| Slump out (mm) | 215 |
| 3d compressive Strength (MPa) | 35.4 |
| 7d compressive Strength (MPa) | 46.8 |
| 28d compressive Strength (MPa) | 58.4 |
Compared with the fully-solid waste pavement concrete using the steel slag in a large proportion, the cement pavement concrete using the steel slag in a large proportion has smaller machine-out slump, the strength of each age is improved to a certain extent, but simultaneously, the cement is used as a cementing material, calcium hydroxide can be generated after hydration, the alkalinity of slurry is increased, the problem of poor stability of the steel slag aggregate is not easy to clear up, and the problem of expansion cracking can occur in the later stage of the concrete.
Claims (7)
1. A full-solid waste pavement concrete using steel slag in a large proportion is characterized in that: the composite material comprises, by mass, 10-25% of a cementing material, 65-85% of converter steel slag aggregate, 3-12.5% of water and 0.1-0.75% of a water reducing agent; the cementing material comprises 75-90% of slag powder and 10-25% of industrial byproduct gypsum.
2. The solid waste pavement concrete using steel slag in a large proportion according to claim 1, wherein: the converter steel slag aggregate is divided into coarse aggregate and fine aggregate, the particle size of the fine aggregate is less than 5mm, the particle size of the coarse aggregate is 5 mm-25 mm, the fine aggregate accounts for 50% -80% of the total mass of the aggregate, and the coarse aggregate accounts for 20% -50% of the total mass of the aggregate.
3. The solid waste pavement concrete using steel slag in a large proportion according to claim 1, wherein: the converter steel slag aggregate is autoclaved under the pressure of 1.0 +/-0.05 Mpa, the test piece is complete, and the autoclaving expansion rate is less than or equal to 0.80 percent.
4. The solid waste pavement concrete using steel slag in a large proportion according to claim 1, wherein the concrete is prepared by mixing a raw material of steel slag with a binderThe method comprises the following steps: the slag powder has a density of more than or equal to 2.8g/cm3The specific surface area is more than or equal to 400m2Granulated blast furnace slag powder with a/kg activity index of 28d being more than or equal to 95 percent.
5. The solid waste pavement concrete using steel slag in a large proportion according to claim 1, wherein: the industrial by-product gypsum is one or more of desulfurized gypsum, phosphogypsum, fluorgypsum, lemon gypsum, waste ceramic mold gypsum, titanium gypsum, mirabilite gypsum and salt gypsum.
6. The method for preparing the all-solid waste pavement concrete using steel slag in a large proportion according to claim 1, which comprises the steps of: uniformly mixing the ground industrial byproduct gypsum and slag powder to prepare a cementing material, and uniformly mixing the cementing material, the converter steel slag aggregate and the water reducing agent with water, wherein the concrete steps are as follows:
(1) grinding the required industrial by-product gypsum, then weighing the gypsum and slag powder according to the dry basis weight percentage of 10-25% and 75-90%, and then uniformly mixing to prepare a cementing material;
(2) according to the mass percentage, 10-25% of cementing material, 13-42.5% of converter steel slag coarse aggregate, 32.5-68% of converter steel slag fine aggregate, 3-12.5% of water and 0.1-0.75% of water reducing agent are added into a stirrer to be stirred, and after being uniformly stirred, the mixture is poured, molded and maintained to obtain the steel slag full-solid waste pavement concrete with large proportion.
7. The method for preparing the all-solid waste pavement concrete using steel slag in a large proportion according to claim 6, wherein: the water reducing agent is one of polycarboxylic acid series, naphthalene series, aminobenzene sulfonic acid series or melamine series high-efficiency water reducing agents.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113380348A (en) * | 2021-07-03 | 2021-09-10 | 内蒙古高等级公路建设开发有限责任公司 | Preparation method and system of steel slag-based mineral admixture |
| CN114507053A (en) * | 2021-12-29 | 2022-05-17 | 武汉大学(肇庆)资源与环境技术研究院 | Cement-free roadbed material and preparation method thereof |
| CN114591061A (en) * | 2022-02-18 | 2022-06-07 | 涉县清漳水泥制造有限公司 | Low-carbon road concrete with steel slag as aggregate and preparation method thereof |
| CN114605113A (en) * | 2021-12-29 | 2022-06-10 | 成都宏基建材股份有限公司 | Lithium slag concrete prepared from pure industrial waste slag and preparation method thereof |
| CN116496060A (en) * | 2023-04-25 | 2023-07-28 | 桂林理工大学 | Low-cost preparation method of alpha semi-hydrated gypsum low-carbon product and product |
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| JP2004292174A (en) * | 2002-03-29 | 2004-10-21 | Taiheiyo Cement Corp | Cement composition and concrete product using the same |
| CN110357548A (en) * | 2019-07-19 | 2019-10-22 | 迁安威盛固废环保实业有限公司 | A kind of full solid waste concrete of high-early-strength high-performance and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2004292174A (en) * | 2002-03-29 | 2004-10-21 | Taiheiyo Cement Corp | Cement composition and concrete product using the same |
| CN110357548A (en) * | 2019-07-19 | 2019-10-22 | 迁安威盛固废环保实业有限公司 | A kind of full solid waste concrete of high-early-strength high-performance and preparation method thereof |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113380348A (en) * | 2021-07-03 | 2021-09-10 | 内蒙古高等级公路建设开发有限责任公司 | Preparation method and system of steel slag-based mineral admixture |
| CN113380348B (en) * | 2021-07-03 | 2022-12-13 | 安徽东材材料科技有限公司 | Preparation method and system of steel slag-based mineral admixture |
| CN114507053A (en) * | 2021-12-29 | 2022-05-17 | 武汉大学(肇庆)资源与环境技术研究院 | Cement-free roadbed material and preparation method thereof |
| CN114605113A (en) * | 2021-12-29 | 2022-06-10 | 成都宏基建材股份有限公司 | Lithium slag concrete prepared from pure industrial waste slag and preparation method thereof |
| CN114591061A (en) * | 2022-02-18 | 2022-06-07 | 涉县清漳水泥制造有限公司 | Low-carbon road concrete with steel slag as aggregate and preparation method thereof |
| CN114591061B (en) * | 2022-02-18 | 2023-01-10 | 涉县清漳水泥制造有限公司 | Low-carbon road concrete with steel slag as aggregate and preparation method thereof |
| CN116496060A (en) * | 2023-04-25 | 2023-07-28 | 桂林理工大学 | Low-cost preparation method of alpha semi-hydrated gypsum low-carbon product and product |
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