CN115259722B - Building material prepared from waste stone powder - Google Patents

Building material prepared from waste stone powder Download PDF

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Publication number
CN115259722B
CN115259722B CN202110481301.0A CN202110481301A CN115259722B CN 115259722 B CN115259722 B CN 115259722B CN 202110481301 A CN202110481301 A CN 202110481301A CN 115259722 B CN115259722 B CN 115259722B
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waste
stone
stone powder
parts
powder
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CN115259722A (en
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贾屹海
陈慧玲
亓熙
赵凯
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Guangdong Tsingda Tongke Environmental Protection Technology Co ltd
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Guangdong Tsingda Tongke Environmental Protection Technology Co ltd
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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
    • 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
    • C04B18/0427—Dry materials
    • 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
    • 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
    • C04B28/02—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 hydraulic cements other than calcium sulfates
    • C04B28/04—Portland 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
    • C04B7/00—Hydraulic cements
    • C04B7/24—Cements from oil shales, residues or waste other than slag
    • C04B7/246—Cements from oil shales, residues or waste other than slag from waste building materials, e.g. waste asbestos-cement products, demolition waste
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00017—Aspects relating to the protection of the environment
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Civil Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention belongs to the technical field of building materials, and particularly relates to a building material prepared from waste stone powder. A building material prepared from waste stone powder comprises, by mass, 40-80 parts of waste stone powder, 10-40 parts of mineral powder, 5-10 parts of steel slag, 5-10 parts of desulfurized gypsum and 1-5 parts of an additive; the building material is prepared by the following method: waste stone powder, mineral powder, steel slag, desulfurized gypsum and additive are mixed and ground until the specific surface area is 500-800 m 2 The building material is obtained in kg. The building material prepared by using the waste stone powder has lower cost, and the utilization rate of the waste stone powder can be greatly improved.

Description

Building material prepared from waste stone powder
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a building material prepared from waste stone powder.
Background
China is a world large country for stone production, and processing plants generate about 1200 million tons of stone waste materials every year, but the reutilization rate of the waste stones is less than 30%, most of the stone waste materials are idle and stacked, so that large-area land is occupied, and certain burden is caused to the surrounding environment. The recycling of the waste stone has been a problem to be solved urgently.
In the prior art, enterprises use waste stones to research building products such as stone powder bricks, brickwork, unmanned aerial vehicle stone-making and the like, but the existing method for recycling the waste stones still has the problems of small utilization scale of natural stones, low added value and the like. And the waste stone belongs to an inert material, the activity is relatively low, and the waste stone needs to be activated, so that the cost of the existing waste stone recycling process is high.
Therefore, a method for treating waste stone with low cost and high utilization rate is needed in the prior art.
Disclosure of Invention
The invention provides a building material prepared from waste stone powder, which is low in cost and greatly improves the utilization rate of waste stone. The invention adopts the following technical scheme.
A building material prepared from waste stone powder comprises the following raw materials, by mass, 40-80 parts of waste stone powder, 10-40 parts of mineral powder, 5-10 parts of steel slag, 5-10 parts of desulfurized gypsum and 1-5 parts of an additive;
the building material is prepared by the following method: waste stone powder, mineral powder, steel slag, desulfurized gypsum and additive are mixed and ground until the specific surface area is 500-800 m 2 Kg of building material.
Further, the building material is an admixture and comprises the following raw materials in parts by weight: 60-80 parts of waste stone powder, 10-20 parts of mineral powder, 5-10 parts of steel slag, 5-10 parts of desulfurized gypsum and 1-5 parts of additive.
Further, the building material is a cementing material and comprises the following raw materials in parts by weight: 40-60 parts of waste stone powder, 20-40 parts of mineral powder, 5-10 parts of steel slag, 5-10 parts of desulfurized gypsum and 1-5 parts of an additive.
Further, the waste stone powder is waste stone factory stone powder or waste natural stone powder. Natural stone powder refers to stone powder of naturally occurring rocks such as slate and granite.
Furthermore, the content of calcium carbonate in the waste natural stone powder is more than or equal to 95wt%.
Furthermore, waste stone factory mountain flour uses the artificial stone as the main thing, and the artificial stone mainly refers to synthetic stone. The synthetic stone is made up by using broken stone of natural stone as raw material, adding adhesive and polishing. The stone powder of the stone factory comprises main components such as limestone, silicate, silicon oxide and the like, and also comprises a small amount of organic impurities, so that the components of the stone powder of the stone factory are more complex and unstable.
The invention provides a scheme for preparing building materials by using stone powder of waste stone factories.
A building material prepared from stone powder of waste stone factories is used as an admixture and comprises the following raw materials in parts by weight: 60-80 parts of waste stone factory stone powder, 10-20 parts of mineral powder, 5-10 parts of steel slag, 5-10 parts of desulfurized gypsum, 1-2 parts of additive, quicklime accounting for 3-7% of the waste stone factory stone powder by mass and inorganic dispersant accounting for 0.2-0.5% of the waste stone factory stone powder by mass;
the admixture is prepared by the following method:
(1) Pulverizing the stone powder of the waste stone factory to a specific surface area of 500-600 m 2 Mixing quicklime and an inorganic dispersant, adding the mixture into ground waste stone powder of a stone factory, performing ball milling and mixing, and aging to obtain modified waste stone powder of the stone factory;
(2) Mixing the modified waste stone factory stone powder, mineral powder, steel slag, desulfurized gypsum and additive in the step (1), and grinding the mixture to 500-600 m 2 Per kg of the resulting admixture.
Alkali excitation is carried out on the waste stone factory stone powder in the step (1) through quicklime in the process of preparing the building material, and mechanical excitation is carried out on the waste stone factory stone powder in the process of mixing and ball milling.
Further, the mixing and ball milling time in the step (1) is 1-2 hours.
Further, the aging time in the step (1) is 6 to 7 days. Through the aging process, the complex organic matters in the raw materials are slowly decomposed into simple organic matters under the action of the alkaline exciting agent, and the content of the complex organic matters is reduced, so that the components of the modified waste stone powder in the stone factory are stabilized.
Further, the inorganic dispersant is one of sodium tripolyphosphate, sodium hexametaphosphate and sodium pyrophosphate. The inorganic dispersant is used for uniformly mixing the waste stone powder and the quicklime in the stone factory.
Further, the inorganic dispersant accounts for 0.2 to 0.5 percent of the mass ratio of the waste stone powder in the stone factory.
Furthermore, the mass percentage of the quicklime in the waste stone powder of the stone factory is 3-7%, too low quicklime cannot achieve the effect of removing complex organic matters, and excessive quicklime remains in the stone powder, so that the later strength of the concrete prepared from the admixture is reduced. The quicklime accounting for 3-7% of the mass of the waste stone powder in the stone factory can be used for effectively carrying out alkali excitation on the waste stone powder in the stone factory.
Further, the additives are an alkaline activator and a water reducing agent.
Further, the alkali activator is NaOH or NaAlO 2 And Na 2 SiO 3 One or more of (a).
Further, the water reducing agent is one or more of lignosulfonate, sulfamate-based high-efficiency water reducing agents, fatty acid-based high-efficiency water reducing agents and polycarboxylate-based high-efficiency water reducing agents.
Further, the admixture prepared by the method for preparing the admixture can be used for preparing concrete.
When the admixture prepared from stone powder in stone factories is used for preparing concrete, the mass ratio of the admixture to the cement is 1:4-4:1. The admixture has a large using amount in concrete, and the main component of the admixture is waste stone powder in stone factories, so that the utilization rate of the stone powder in the waste stone factories can be greatly improved compared with the prior art.
The method comprises the steps of modifying waste stone factory stone powder through alkali excitation and chemical excitation to obtain fully hydrated modified waste stone factory stone powder, mixing the modified waste stone factory stone powder with raw materials such as mineral powder and steel slag to prepare an admixture, preparing C30 concrete from the prepared admixture and silicate cement with a market mark of 42.5, and enabling the strength of the obtained concrete to be more than 30MPa in 28 days; the use amount of the admixture in the concrete is larger, so that the utilization rate of the stone powder in a waste stone factory can be greatly improved.
A building material prepared from waste stone factory stone powder is a cementing material, and comprises the following raw materials in parts by weight: 40-50 parts of waste stone factory stone powder, 20-40 parts of mineral powder, 5-10 parts of steel slag, 5-10 parts of desulfurized gypsum, 1-5 parts of additive, quicklime accounting for 3-7% of the waste stone factory stone powder by mass and inorganic dispersant accounting for 0.2-0.5% of the waste stone factory stone powder by mass;
the gelled material is prepared by the following method:
(1) Pulverizing the stone powder of waste stone factories to the specific surface area of 550-600m 2 (iv) kg; mixing quicklimeMixing the waste stone powder with an inorganic dispersant, adding the mixture into the crushed waste stone factory stone powder, mixing, ball-milling and aging to obtain modified waste stone factory stone powder;
(2) Mixing and ball-milling the stone powder, mineral powder, steel slag, desulfurized gypsum and additive of the waste stone factory modified in the step (1) until the specific surface area is 600-700 m 2 Kg, obtaining the cementing material.
Alkali excitation is carried out on the waste stone factory stone powder in the step (1) through quicklime in the process of preparing the building material, and mechanical excitation is carried out on the waste stone factory stone powder in the process of mixing and ball milling.
Further, the mixing and ball milling time in the step (1) is 1-2 hours.
Further, the aging time in the step (1) is 6 to 7 days. Through the aging process, the complex organic matters in the raw materials are slowly decomposed into simple organic matters under the action of the alkaline exciting agent, and the content of the complex organic matters is reduced, so that the components of the modified waste stone powder in the stone factory are stabilized.
Further, the inorganic dispersant is one of sodium tripolyphosphate, sodium hexametaphosphate and sodium pyrophosphate. The inorganic dispersant is used for uniformly mixing the stone powder and the quicklime in the waste stone factory.
Further, the inorganic dispersant accounts for 0.2 to 0.5 percent of the stone powder in stone factories.
Furthermore, the mass percentage of the quicklime in the stone powder of the waste stone factory is 3-7%, too low quicklime cannot achieve the effect of removing complex organic matters, and excessive quicklime remains in the stone powder, so that the later strength of the concrete prepared from the admixture is reduced. The quick lime accounting for 3-7% of the waste stone factory stone powder mass can effectively carry out alkali excitation on the waste stone factory stone powder.
Further, the additives are an alkaline activator and a water reducing agent.
Further, the alkali activator is NaOH or NaAlO 2 And Na 2 SiO 3 One or more of (a).
Further, the water reducing agent is one or more of lignosulfonate, sulfamate-based high-efficiency water reducing agents, fatty acid-based high-efficiency water reducing agents and polycarboxylate-based high-efficiency water reducing agents.
According to the invention, the fully hydrated modified waste stone factory stone powder is obtained by modifying waste stone factory stone powder through alkali excitation and chemical excitation, the modified waste stone factory stone powder is mixed with raw materials such as mineral powder and steel slag to prepare the cementing material, the strength of a mortar test strip prepared from the obtained cementing material in 28 days can reach more than 45MPa, the hydration degree is high, and the cementing material can be used in the field of non-bearing part buildings at the present stage.
The invention also provides a technical scheme for preparing the building material by utilizing the waste natural stone powder.
The building material prepared by utilizing waste natural stone powder is taken as a blending material and comprises the following raw materials in parts by weight: 70-80 parts of waste natural stone powder, 10-20 parts of mineral powder, 5-10 parts of steel slag, 5-10 parts of desulfurized gypsum and 1-5 parts of additive;
the admixture is prepared by the following method:
(1) Respectively drying the waste natural stone powder, the mineral powder, the steel slag, the desulfurized gypsum and the additive until the water content of the raw materials is less than 1.0%;
(2) Weighing the waste natural stone powder, slag, steel slag, desulfurized gypsum and additive dried in the step (1), putting the waste natural stone powder, slag, steel slag, desulfurized gypsum and additive into a ball mill, mixing and ball-milling until the specific surface area is 600-800 m 2 And/kg, thus obtaining the admixture.
Further, in the step (1), the waste natural stone powder, the mineral powder, the steel slag, the desulfurized gypsum and the additive are dried in a 50 ℃ blast drying oven for 2-5 hours.
Further, the additive comprises an alkaline activator, aluminate and a water reducing agent. The mass ratio of the alkaline exciting agent, the aluminate and the water reducing agent is (1-2) to (0.2-1).
Further, the aluminate is sodium aluminate.
Further, the alkali activator is NaOH, ca (OH) 2 KOH and Na 2 SiO 3 One or more of (a).
Further, the water reducing agent is one or more of lignosulfonate, sulfamate-based high-efficiency water reducing agents, fatty acid-based high-efficiency water reducing agents and polycarboxylate-based high-efficiency water reducing agents.
In the invention, mineral powder, aluminate and other aluminum-containing materials are added to improve the reactivity of the waste natural stone powder and other materials. Because the waste natural stone powder is almost an inert material, the volcanic ash activity is not generated, and no gel is generated. However, the waste natural stone powder has small solubility in water, and the dissolved carbonate ions can react with aluminum phases to generate monocarbon type and semi-carbonium type calcium carbonate aluminates, and the generation of the calcium carbonate aluminates can reduce the porosity of a cementing material or a cement-based material and improve the pore structure of the cementing material or the cement-based material, thereby improving the strength of the cementing material or the cement-based material. The invention adds mineral powder, aluminate and other materials containing aluminum phase into the raw materials to improve the reactivity of the waste natural stone powder and other materials.
In addition, the waste natural stone powder has fewer active ingredients participating in hydration reaction and relatively low activity, the number of fine particles is increased through mechanical ball milling, the lubricating effect and the homogenizing effect of stone powder particles are improved, and the particle grading and the particle uniformity of the waste natural stone powder and other materials are improved; and adding an alkali activator to promote the hydration speed of the cementing material, so that the cementing material can react with the natural stone powder particles to form a hydration product, and the interface performance of the surfaces of the waste natural stone powder particles is improved.
When the admixture prepared by using the waste natural stone powder is used for preparing concrete, the mass ratio of the admixture to the cement is 1:4-4:1. The admixture has a large dosage in concrete, and the main component of the admixture is waste natural stone, so that the utilization rate of the waste natural stone can be greatly improved compared with the prior art.
According to the invention, the grinding and homogenizing effects are more obvious by adding the aluminum-containing materials such as mineral powder and aluminate and mixing the materials with the waste natural stone powder in a ball milling manner; the mixing and grinding mode has the functions of stirring uniformly and grinding, and the activity excitation effect of mechanical force on materials is increased, so that the grading and activity synergy dual optimization of the waste natural stone powder and other material components is facilitated, the beneficial effect of the waste natural stone powder is fully exerted in the admixture, and the waste natural stone powder is more efficiently utilized.
The building material prepared by using the waste natural stone powder is a cementing material and comprises the following raw materials in parts by weight: 40-60 parts of waste natural stone powder, 20-40 parts of mineral powder, 5-10 parts of steel slag, 5-10 parts of desulfurized gypsum and 1-5 parts of an additive; the gelled material is prepared by the following method:
(1) Grinding the waste natural stone powder to ensure that the specific surface area reaches 700-800 m 2 Per kg; respectively drying the waste natural stone powder, mineral powder, steel slag, desulfurized gypsum and additive until the water content of the raw materials is less than 1.0%;
(2) Weighing the dried waste natural stone powder, slag, steel slag, desulfurized gypsum and additive in the step (1), putting the waste natural stone powder, the slag, the steel slag, the desulfurized gypsum and the additive into a ball mill, and mixing and ball-milling the mixture for 600-800 m 2 And/kg, thus obtaining the cementing material.
Furthermore, the invention utilizes the characteristic that the waste natural stone powder is easy to grind, and adopts a method of pre-grinding the waste natural stone powder and then mixing and grinding the waste natural stone powder with other materials to obtain the waste natural stone powder with larger fineness. The mechanical grinding can destroy the surface structure of the stone powder by mechanical force, change the particle size and the particle shape of the waste natural stone powder, improve the lubricating effect and the homogenizing effect of the waste natural stone powder particles, improve the aggregate grading and be beneficial to showing the activity of the waste natural stone powder.
Further, in the step (1), the waste natural stone powder, the mineral powder, the steel slag, the desulfurized gypsum and the additive are dried in a forced air drying oven at 50 ℃ for 2-5 hours.
Furthermore, in the process of preparing the building material by adopting the waste natural stone powder, the additive comprises an alkaline activator, aluminate and a water reducing agent. The mass ratio of the alkali activator, the aluminate and the water reducing agent is (1-2): (1-2): (0.2-1).
Further, the aluminate is sodium aluminate.
Further, the alkali activator is NaOH, ca (OH) 2 KOH and Na 2 SiO 3 One or more of (a).
Further, the water reducing agent is one or more of lignosulfonate, sulfamate-based high-efficiency water reducing agents, fatty acid-based high-efficiency water reducing agents and polycarboxylate-based high-efficiency water reducing agents.
In the invention, mineral powder, aluminate and other materials containing aluminum phase are added to improve the reactivity of the waste natural stone powder and other materials. The waste natural stone powder is almost inert material, has no volcanic ash activity and can not generate gel. However, the waste natural stone powder has a small solubility in water, and the dissolved carbonate ions can react with aluminum phase to generate single-carbon type and semi-carbon type calcium carbonate aluminates, and the generation of the calcium carbonate aluminates can reduce the porosity of a cementing material or a cement-based material and improve the pore structure of the cementing material or the cement-based material, so that the strength of the cementing material or the cement-based material is improved.
In addition, the waste natural stone powder has fewer active ingredients participating in hydration reaction and relatively low activity, the number of fine particles is increased through mechanical ball milling, the lubricating effect and the homogenizing effect of stone powder particles are improved, and the particle grading and the particle uniformity of the waste natural stone powder and other materials are improved; in addition, an alkali activator is added to promote the hydration speed of the cementing material, so that the cementing material can react with the waste natural stone powder particles to form a hydration product, and the interface performance of the surfaces of the waste natural stone powder particles is improved.
The invention makes the grinding and homogenizing effect more obvious by pre-grinding the raw materials and then mixing and ball-milling; the mixing and grinding mode has the functions of stirring uniformly and grinding, and increases the activity excitation effect of mechanical force on materials, so that the grading and activity synergistic dual optimization of the waste natural stone powder and other material components is facilitated, the beneficial effect of the waste natural stone powder is fully exerted in the cementing material, and the waste natural stone powder is more efficiently utilized.
Compared with the prior art, the invention has the following beneficial effects:
the building material prepared by using the waste stone powder has lower cost, and the utilization rate of the waste stone powder can be greatly improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and 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.
Example 1
Pulverizing the stone powder of the waste stone factory to the specific surface area of 575m 2 And/kg, mixing quicklime accounting for 4 percent of the waste stone factory stone powder by mass percent and sodium tripolyphosphate 0.2 percent, adding the mixed quicklime and sodium tripolyphosphate into the pulverized waste stone factory stone powder, mixing and ball-milling for 1h at the ball-milling rotating speed of 78r/min, and aging the mixed raw materials in a dry environment for 7 days to obtain the modified waste stone factory stone powder.
Taking modified waste stone powder of stone factories as a main raw material, and preparing an admixture by adding the following raw materials by mass: 60kg of modified waste stone factory stone powder, 15kg of mineral powder, 10kg of steel slag, 10kg of desulfurized gypsum, 1kg of lignosulfonate and 1kg of NaOH. The weighed raw materials are put into a ball mill for grinding to ensure that the specific surface area reaches 500-600 m 2 And/kg, thus obtaining the admixture.
Example 2
Pulverizing the waste stone factory stone powder to specific surface area of 575m 2 And/kg, mixing 7 percent of quicklime and 0.3 percent of sodium hexametaphosphate in percentage by mass of the waste stone factory stone powder, adding the mixed quicklime and sodium hexametaphosphate into the pulverized waste stone factory stone powder, mixing and ball-milling for 1h at the ball-milling rotating speed of 78r/min, and aging the mixed raw materials in a dry environment for 7 days to obtain the modified waste stone factory stone powder.
Taking modified waste stone powder of stone factories as a main raw material, and preparing an admixture by adding the following raw materials by mass: 70kg of modified waste stone factory stone powder, 20kg of mineral powder, 5kg of steel slag, 5kg of desulfurized gypsum, 0.5kg of fatty acid-based superplasticizer 2 0.5kg of raw materials. The weighed raw materials are put into a ball mill for grinding to ensure that the specific surface area reachesTo 500-600 m 2 And/kg, thus obtaining the admixture.
Example 3
Pulverizing the stone powder of the waste stone factory to the specific surface area of 575m 2 And/kg, mixing 3 percent of quicklime and 0.5 percent of sodium pyrophosphate in percentage by mass of the waste stone factory stone powder, adding the mixed quicklime and sodium pyrophosphate into the pulverized waste stone factory stone powder, mixing and ball-milling for 1h at the ball-milling rotating speed of 78r/min, and aging the mixed raw materials in a dry environment for 7 days to obtain the modified waste stone factory stone powder.
Taking modified waste stone powder of stone factories as a main raw material, and preparing an admixture by adding the following raw materials by mass: 80kg of modified waste stone factory stone powder, 10kg of mineral powder, 7kg of steel slag, 7kg of desulfurized gypsum, 0.5kg of polycarboxylate superplasticizer 2 SiO 3 1kg. The weighed raw materials are put into a ball mill for grinding to ensure that the specific surface area reaches 500-600 m 2 And/kg, thus obtaining the admixture.
Comparative example 1
The method is characterized in that waste stone factory stone powder is pulverized, quicklime accounting for 2% of the waste stone factory stone powder in mass percent and sodium tripolyphosphate accounting for 0.2% of the waste stone factory stone powder are mixed and added into the pulverized waste stone factory stone powder to be mixed and ball-milled for 1 hour, and the mixed raw materials are placed in a dry environment to be aged for 7 days to obtain the modified waste stone factory stone powder. The remaining technical features are the same as in example 1.
Comparative example 2
The comparative example 2 is arranged on the basis of the example 1, and the technical characteristic of the comparative example 2 which is different from the example 1 is that the admixture is prepared only by carrying out pulverization treatment on stone powder of stone factories in the comparative example 2, and the steps of alkali excitation and mechanical excitation are not carried out. The remaining features are the same as in example 1.
Comparative example 3
The method is characterized in that waste stone factory stone powder is pulverized, quicklime accounting for 3% of the waste stone factory stone powder in percentage by mass and 0.2% of sodium tripolyphosphate are mixed and then added into the pulverized waste stone factory stone powder, and the mixed raw materials are placed in a dry environment to age for 7 days to obtain the modified waste stone factory stone powder. The remaining features are the same as in example 1.
The admixtures prepared in examples 1 to 3 and comparative examples 1 to 3 were mixed with portland cement commercially available under the designation 42.5 to prepare C30 concrete. The specific implementation mode is as follows:
example 4
286kg of the admixture prepared in example 1, 72kg of portland cement sold under the market designation 42.5, 950kg of machine-made sand, 930kg of crushed stone and 0.3kg of a water reducing agent (lignosulfonate) were weighed to prepare C30 concrete.
Example 5
179kg of the admixture prepared in example 1, 179kg of portland cement available under the trade name of 42.5, 950kg of machine-made sand, 930kg of crushed stone, and 0.3kg of a water reducing agent (lignosulfonate) were weighed to prepare C30 concrete.
Example 6
72kg of the admixture prepared in the embodiment 1, 286kg of Portland cement with the market label of 42.5, 950kg of machine-made sand, 930kg of broken stone and 0.3kg of water reducing agent are weighed to prepare C30 concrete.
Example 7
286kg of the admixture prepared in the example 2, 72kg of portland cement with a commercial grade of 42.5, 950kg of machine-made sand, 930kg of broken stone and 0.3kg of water reducing agent (lignosulfonate) are weighed to prepare C30 concrete.
Example 8
179kg of the admixture prepared in example 2, 179kg of portland cement available under the trade name of 42.5, 950kg of machine-made sand, 930kg of crushed stone, and 0.3kg of a water reducing agent (lignosulfonate) were weighed to prepare C30 concrete.
Example 9
72kg of the admixture prepared in the example 2, 286kg of portland cement sold under the market designation 42.5, 950kg of machine-made sand, 930kg of crushed stone and 0.3kg of a water reducing agent (lignosulfonate) are weighed to prepare C30 concrete.
Example 10
286kg of the admixture prepared in example 3, 72kg of portland cement sold under the market designation 42.5, 950kg of machine-made sand, 930kg of crushed stone and 0.3kg of a water reducing agent (lignosulfonate) were weighed to prepare C30 concrete.
Example 11
179kg of the admixture prepared in example 3, 179kg of portland cement with a commercial designation of 42.5, 950kg of machine-made sand, 930kg of crushed stone and 0.3kg of a water reducing agent (lignosulfonate) are weighed to prepare C30 concrete.
Example 12
72kg of the admixture prepared in the example 3, 286kg of portland cement sold under the market designation 42.5, 950kg of machine-made sand, 930kg of crushed stone and 0.3kg of a water reducing agent (lignosulfonate) are weighed to prepare C30 concrete.
Example 13
286kg of the admixture prepared in the comparative example 1, 72kg of portland cement with the commercial grade of 42.5, 950kg of machine-made sand, 930kg of broken stone and 0.3kg of water reducing agent (lignosulfonate) are weighed to prepare C30 concrete.
Example 14
179kg of the admixture prepared in the comparative example 1, 179kg of portland cement with a commercial designation of 42.5, 950kg of machine-made sand, 930kg of crushed stone and 0.3kg of a water reducing agent (lignosulfonate) were weighed to prepare C30 concrete.
Example 15
72kg of the admixture prepared in the comparative example 1, 286kg of portland cement sold under the market designation 42.5, 950kg of machine-made sand, 930kg of crushed stone and 0.3kg of water reducing agent (lignosulfonate) are weighed to prepare C30 concrete.
Example 16
286kg of the admixture prepared in the comparative example 2, 72kg of portland cement sold under the market reference number of 42.5, 950kg of machine-made sand, 930kg of crushed stone and 0.3kg of water reducing agent (lignosulfonate) are weighed to prepare C30 concrete.
Example 17
179kg of the admixture prepared in the comparative example 2, 179kg of portland cement with a commercial designation of 42.5, 950kg of machine-made sand, 930kg of crushed stone and 0.3kg of a water reducing agent (lignosulfonate) were weighed to prepare C30 concrete.
Example 18
72kg of the admixture prepared in the comparative example 2, 286kg of portland cement sold under the market designation 42.5, 950kg of machine-made sand, 930kg of crushed stone and 0.3kg of water reducing agent (lignosulfonate) are weighed to prepare C30 concrete.
Example 19
286kg of the admixture prepared in the comparative example 3, 72kg of portland cement sold under the market reference number of 42.5, 950kg of machine-made sand, 930kg of crushed stone and 0.3kg of water reducing agent (lignosulfonate) are weighed to prepare C30 concrete.
Example 20
179kg of the admixture prepared in the comparative example 3, 179kg of portland cement available under the market designation 42.5, 950kg of machine-made sand, 930kg of crushed stone, and 0.3kg of a water reducing agent (lignosulfonate) were weighed to prepare C30 concrete.
Example 21
72kg of the admixture prepared in the comparative example 3, 286kg of portland cement sold under the market designation 42.5, 950kg of machine-made sand, 930kg of crushed stone and 0.3kg of a water reducing agent (lignosulfonate) are weighed to prepare C30 concrete.
The concrete prepared in examples 4 to 21 was tested for compressive strength according to GB/T50107-2010 "Standard for evaluation of concrete Strength test" using the test method, and the results are shown in Table 1 below:
TABLE 1 results of concrete Performance test
3 day compressive strength (MPa) 7 day compressive strength (MPa) 28 day compressive strength (MPa)
Example 4 15.8 21.3 29.8
Example 5 18.5 27.0 32.8
Example 6 21.8 28.3 35.5
Example 7 15.5 22.4 30.2
Example 8 19.4 27.2 33.6
Example 9 22.6 28.6 35.1
Example 10 15.0 22.5 29.9
Example 11 20.0 27.1 33.1
Example 12 21.9 28.5 34.8
Example 13 12.1 15.1 19.1
Example 14 14.2 18.4 23.1
Example 15 18.1 20.1 28.4
Example 16 8.9 13.2 15.2
Example 17 10.2 15.1 17.3
Example 18 13.2 18.2 18.9
Example 19 9.0 13.5 16.0
Example 20 10.1 15.3 18.1
Example 21 13.4 18.5 19.0
As can be seen from the test data in Table 1, the technical solution of the present invention provides an admixture which can be used for preparing concrete. When the admixture prepared by the invention is used for preparing concrete, the addition amount of the admixture and the addition amount of cement can be 1:4-4:1, the use amount of the admixture in the concrete is large, and the utilization rate of stone powder in a waste stone factory can be greatly improved. The strength of the concrete prepared by the invention can reach more than 30MPa in 28 days. Comparative example 1 caustic lime accounting for 2% of the mass of the waste stone powder in the waste stone factory is added to carry out alkali excitation on the waste stone powder in the waste stone factory, and the concrete prepared from the admixture prepared in the comparative example 1 has the compressive strength of only 19-29MPa after 28 days. The admixture prepared in the comparative example 2 is the admixture prepared by the stone powder of the waste stone factory without modification treatment, and the concrete prepared by the admixture prepared in the comparative example 2 has the compressive strength of 15-19MPa in 28 days. Comparative example 3 is an admixture prepared from pulverized waste stone mill stone powder of waste stone mill, which is not mechanically excited with a mixture of inorganic dispersant and quicklime, and concrete prepared from the admixture prepared in comparative example 1 has a 28-day compressive strength of 16-19MPa. Therefore, the admixture prepared by the method for preparing the admixture from the stone powder in the waste stone factory can meet the use requirement of the concrete admixture.
Example 22
Pulverizing the stone powder of the waste stone factory to 586m 2 And/kg, mixing quicklime accounting for 4 percent of the waste stone factory stone powder by mass percent and 0.2 percent of sodium tripolyphosphate, adding the mixture into the pulverized waste stone factory stone powder, mixing and ball-milling for 1h, wherein the ball-milling rotating speed is 80r/min, and aging the mixed raw materials in a dry environment for 7 days to obtain the modified waste stone factory stone powder.
Taking modified waste stone factory stone powder as a main raw material, and preparing a cementing material by the following mass: 50kg of stone powder, 20kg of mineral powder, 10kg of steel slag, 10kg of desulfurized gypsum, 1kg of lignosulfonate and 1kg of NaOH. The weighed raw materials are put into a ball mill for grinding to ensure that the specific surface area reaches 600-700 m 2 And/kg, obtaining the cementing material.
Example 23
Pulverizing the stone powder of the waste stone factory to 586m 2 And/kg, mixing 7 percent of quicklime and 0.3 percent of sodium hexametaphosphate in percentage by mass of the waste stone factory stone powder, adding the pulverized waste stone factory stone powder, mixing and ball-milling for 1 hour, wherein the ball-milling rotating speed is 80r/min, and aging the mixed raw materials in a dry environment for 7 days to obtain the modified waste stone factory stone powder.
Taking modified waste stone powder of stone factories as a main raw material, preparing a cementing material by the following weight of raw materials: 40kg of stone powder, 25kg of mineral powder, 7kg of steel slag, 8kg of desulfurized gypsum, 0.5kg of sulfamate high-efficiency water reducing agent 2 0.5kg. The weighed raw materials are put into a ball mill for grinding to ensure that the specific surface area reaches 600-700 m 2 And/kg, thus obtaining the cementing material.
Example 24
Pulverizing the stone powder of the waste stone factory to 586m 2 Mixing 3 percent of quicklime and 0.5 percent of sodium tripolyphosphate by mass percentage of the waste stone factory stone powder, adding the mixture into the pulverized waste stone factory stone powder, mixing and ball-milling for 1h, wherein the ball-milling rotating speed is 80r/min, and placing the mixed raw materials in a dry environmentAnd aging for 7 days to obtain modified waste stone factory stone powder.
Taking modified waste stone powder of stone factories as a main raw material, preparing a cementing material by the following weight of raw materials: 45kg of stone powder, 40kg of mineral powder, 5kg of steel slag, 5kg of desulfurized gypsum, 2kg of polycarboxylate superplasticizer 2 SiO 3 1kg of raw materials. The weighed raw materials are put into a ball mill for grinding to ensure that the specific surface area reaches 600-700 m 2 And/kg, obtaining the cementing material.
Example 25
Pulverizing the stone powder of the waste stone factory to 586m 2 And/kg, mixing 5 percent of quicklime and 0.3 percent of sodium pyrophosphate in percentage by mass of the waste stone factory stone powder, adding the mixture into the pulverized waste stone factory stone powder, mixing and ball-milling for 1h, wherein the ball-milling rotating speed is 80r/min, and aging the mixed raw materials in a dry environment for 7 days to obtain the modified waste stone factory stone powder.
Taking modified waste stone powder of stone factories as a main raw material, and preparing a cementing material, wherein the mass portions are as follows: 48kg of stone powder, 30kg of mineral powder, 9kg of steel slag, 6kg of desulfurized gypsum, 2kg of fatty acid high water reducing agent 2 SiO 3 3kg of raw materials. The weighed raw materials are put into a ball mill for grinding to ensure that the specific surface area reaches 600-700 m 2 And/kg, obtaining the cementing material.
Comparative example 4
Comparative example 4 was provided on the basis of example 22, and the technical difference between comparative example 4 and example 22 is that in comparative example 4, only the stone powder of a stone mill was subjected to pulverization treatment to prepare a cementitious material, and the alkali-and mechanical-excitation steps were not performed. The remaining features are the same as those of embodiment 22.
Comparative example 5
Comparative example 5 is arranged on the basis of example 22, and the technical difference between the comparative example 5 and the example 22 is that the waste stone factory stone powder is pulverized to 586m of specific surface area 2 Mixing quicklime accounting for 2 percent of the waste stone factory stone powder by mass percentage and 0.2 percent of sodium tripolyphosphate, adding the mixture into the pulverized waste stone factory stone powder, mixing and ball-milling for 1h, wherein the ball-milling rotating speed is 80r/min, and mixing the mixture with the waste stone factory stone powderAnd aging the mixed raw materials in a dry environment for 7 days to obtain the modified waste stone factory stone powder. The remaining features are the same as those of embodiment 22.
Comparative example 6
Comparative example 6 is arranged on the basis of example 22, and the technical difference between the comparative example 6 and the example 22 is that the waste stone factory stone powder is pulverized to 586m of specific surface area 2 And/kg, mixing 3 percent of quicklime and 0.2 percent of sodium tripolyphosphate in percentage by mass of the waste stone factory stone powder, adding the mixture into the pulverized waste stone factory stone powder, and aging the mixture in a dry environment for 7 days to obtain the modified waste stone factory stone powder. The remaining features are the same as those of embodiment 22.
Comparative example 7
In comparative example 7 portland cement with the commercial designation 42.5 was used as the cement.
Comparative example 8
In comparative example 8 portland cement, commercially available under the designation 32.5, was used as the cement.
Mortar test bars were prepared from the cements prepared in examples 22-25 and comparative examples 4-8 according to GB/T17671-1999 "Cement mortar Strength test methods" according to standard mortar mix ratios, and the mortar was tested for flexural strength and compressive strength at 3d, 7d and 28 d. The results are shown in Table 1.
Table 2 test results of the mortar test strip
Figure BDA0003049364700000141
The test data in table 2 show that the mortar test strip of the cementitious material prepared from the modified waste stone powder obtained in the technical scheme of the invention has a compressive strength of more than 45MPa and a breaking strength of more than 9MPa in 28 days. The compression strength and the flexural strength of the mortar test strip of the cementing material prepared by the invention are higher than those of the cement sold on the market 32.5, and the performance of the mortar test strip is not greatly different from that of the cement sold on the market 42.5. Comparative example 4 is a cementitious material prepared from unmodified waste stone mill stone powder, and the compressive strength of a mortar test strip of the cementitious material does not meet the use requirements. Comparative example 5 is a gelled material prepared by alkali excitation of waste stone factory stone powder by 2% of quicklime, and the compressive strength of a mortar test strip is improved compared with that of comparative document 1, but the mortar test strip still cannot meet the use requirement. Comparative example 6 is a cementitious material prepared without grinding and mechanically exciting a mixture of pulverized waste stone powder from stone mills, quicklime and an inorganic dispersant, and the strength of the cementitious material does not meet the use requirements. Therefore, the gelled material prepared from the waste stone factory stone powder obtained by adopting the modification method and controlling the adding amount of the quicklime in alkali excitation can meet the use requirement of the non-bearing field at the present stage.
Example 26
(1) Drying the waste blocky natural stone and then crushing for later use;
(2) Weighing 80kg of waste natural stone powder, 10kg of mineral powder, 5kg of steel slag, 5kg of desulfurized gypsum, 2kg of sodium aluminate 2 2kg of lignin sulfonate and 0.2kg of lignosulfonate, drying in a 50 ℃ forced air drying oven for 2 hours, adding into a ball mill, mixing and ball-milling until the specific surface area is 600-800 m 2 And/kg, obtaining the admixture.
Example 27
(1) Drying the waste blocky natural stone and then crushing for later use;
(2) Weighing waste natural stone powder 70kg, mineral powder 20kg, steel slag 10kg, desulfurized gypsum 10kg, sodium aluminate 1kg 2 1kg of the high-efficiency water reducing agent containing sulfamate 0.8kg of the high-efficiency water reducing agent is put into a forced air drying oven with the temperature of 50 ℃ for drying for 2 hours, and then the mixture is added into a ball mill for mixing and ball milling until the specific surface area is 600-800 m 2 And/kg, obtaining the admixture.
Example 28
(1) Drying the waste blocky natural stone and then crushing for later use;
(2) Weighing 75kg of waste natural stone powder, 15kg of mineral powder, 7kg of steel slag, 7kg of desulfurized gypsum, 1.5kg of sodium aluminate, 1.5kg of KOH1.5kg and 0.5kg of fatty acid-based superplasticizer, drying in a 50 ℃ forced air drying oven for 2h, adding into a ball mill, mixing and ball-milling until the specific surface area is 600-800 m 2 Kg, to give an admixture.
Comparative example 9
Comparative example 9 is set on the basis of example 26, and the technical characteristics of comparative example 9 and example 26 are that no additive is added. The remaining technical features are the same as those of example 26.
Comparative example 10
Comparative example 10 is set on the basis of example 26, and the technical characteristics of comparative example 10 and example 26 are that no sodium aluminate is added. The remaining technical features are the same as those of example 26.
Comparative example 11
Comparative example 11 is arranged on the basis of example 26, and the technical characteristics of comparative example 11 and example 26 are that no NaOH is added. The remaining technical features are the same as those of example 26.
C30 concrete was prepared by mixing each of the admixtures prepared in examples 26 to 28 and comparative examples 9 to 11 with portland cement commercially available under the reference numeral 42.5. The specific implementation mode is as follows:
example 29
286kg of the admixture prepared in example 26, 72kg of portland cement available under the market designation 42.5, 950kg of machine-made sand, 930kg of crushed stone were weighed, and C30 concrete was prepared.
Example 30
215kg of the admixture prepared in example 26, 143kg of portland cement available commercially as 42.5, 950kg of machine-made sand and 930kg of crushed stone were weighed and prepared into a C30 concrete.
Example 31
143kg of the admixture prepared in example 26, 215kg of Portland cement available as 42.5, 950kg of machine-made sand and 930kg of crushed stone were weighed, and C30 concrete was prepared.
Example 32
72kg of the admixture prepared in example 26, 286kg of portland cement available under the market designation 42.5, 950kg of machine-made sand, 93kg of crushed stone were weighed, and C30 concrete was prepared.
Example 33
286kg of the admixture prepared in example 27, 72kg of portland cement available under the commercial designation 42.5, 950kg of machine-made sand, 930kg of crushed stone were weighed, and C30 concrete was prepared.
Example 34
215kg of the admixture prepared in example 27, 143kg of portland cement available commercially as 42.5, 950kg of machine-made sand and 930kg of crushed stone were weighed and prepared into a C30 concrete.
Example 35
143kg of the admixture prepared in example 27, 215kg of Portland cement available as 42.5, 950kg of machine-made sand and 930kg of crushed stone were weighed, and C30 concrete was prepared.
Example 36
72kg of admixture prepared in example 27, 286kg of portland cement sold under the trade name of 42.5, 950kg of machine-made sand and 930kg of broken stone are weighed and prepared into C30 concrete.
Example 37
286kg of the admixture prepared in example 28, 72kg of portland cement with the commercial designation of 42.5, 950kg of machine-made sand and 930kg of broken stone are weighed and prepared into C30 concrete.
Example 38
215kg of the admixture prepared in example 28, 143kg of portland cement available commercially as 42.5, 950kg of machine-made sand, 930kg of crushed stone were weighed, and C30 concrete was prepared.
Example 39
143kg of the admixture prepared in example 28, 215kg of Portland cement sold under the market designation 42.5, 950kg of machine-made sand and 930kg of crushed stone were weighed, and C30 concrete was prepared.
Example 40
72kg of the admixture prepared in example 28, 286kg of portland cement marketed under the reference numeral 42.5, 950kg of machine-made sand and 930kg of crushed stone were weighed, and C30 concrete was prepared.
EXAMPLE 41
286kg of the admixture prepared in the comparative example 9, 72kg of portland cement with the commercial label of 42.5, 950kg of machine-made sand and 930kg of broken stone are weighed, and C30 concrete is prepared.
Example 42
215kg of the admixture prepared in the comparative example 9, 143kg of Portland cement sold under the market designation 42.5, 950kg of machine-made sand and 930kg of crushed stone were weighed, and C30 concrete was prepared.
Example 43
143g of the admixture prepared in comparative example 9, 215g of Portland cement with the commercial designation of 42.5, 950g of machine-made sand and 930g of broken stone are weighed, and C30 concrete is prepared.
Example 44
72kg of the admixture prepared in the comparative example 9, 286kg of portland cement sold under the market designation 42.5, 950kg of machine-made sand and 930kg of broken stone are weighed, and C30 concrete is prepared.
Example 45
286kg of the admixture prepared in the comparative example 10, 72kg of portland cement sold under the market designation 42.5, 950kg of machine-made sand and 930kg of broken stone were weighed, and C30 concrete was prepared.
Example 46
215kg of the admixture prepared in the comparative example 10, 143kg of Portland cement sold under the market designation 42.5, 950kg of machine-made sand and 930kg of crushed stone were weighed, and C30 concrete was prepared.
Example 47
143kg of the admixture prepared in comparative example 10, 215kg of Portland cement sold under the market designation of 42.5, 950kg of machine-made sand and 930kg of crushed stone were weighed, and C30 concrete was prepared.
Example 48
72kg of the admixture prepared in the comparative example 10, 286kg of Portland cement sold under the market reference number of 42.5, 950kg of machine-made sand and 930kg of broken stone are weighed, and C30 concrete is prepared.
Example 49
286kg of the admixture prepared in the comparative example 11, 72kg of portland cement with the commercial label of 42.5, 950kg of machine-made sand and 930kg of broken stone are weighed, and C30 concrete is prepared.
Example 50
215g of the admixture prepared in the comparative example 11, 143g of portland cement sold under the market designation 42.5, 950g of machine-made sand and 930g of crushed stone were weighed, and C30 concrete was prepared.
Example 51
143kg of the admixture prepared in comparative example 11, 215kg of Portland cement sold under the market designation 42.5, 950kg of machine-made sand and 930kg of crushed stone were weighed, and C30 concrete was prepared.
Example 52
72kg of the admixture prepared in the comparative example 11, 286kg of portland cement sold under the market designation 42.5, 950kg of machine-made sand and 930kg of broken stone are weighed, and C30 concrete is prepared.
The activity of the admixtures prepared in examples 26-28 and comparative examples 9-11 was tested according to the corresponding test methods and standards in GB/T18046-2000 "granulated blast furnace slag powder for use in cement and concrete", and the test results are shown in Table 3. The activity index refers to the ratio of standard mortar strength of natural stone powder admixture replacing 50% of cement to standard mortar strength.
TABLE 3 Activity testing of admixtures
7 day Activity index (%) 28 day Activity index (%)
Example 26 77.92 79.34
Example 27 78.03 80.21
Example 28 78.16 81.23
Comparative example 9 50.55 52.33
Comparative example 10 59.42 60.3
Comparative example 11 56.72 60.2
The concrete prepared in examples 29 to 52 was tested for strength according to the corresponding test methods and standards in the national standard GB/T50081 Standard for mechanical Properties test methods for general concrete, and the results are shown in Table 4:
TABLE 4 compressive strength test chart of concrete
Figure BDA0003049364700000191
As can be seen from the test data in tables 3 and 4, the activity of the admixture prepared by the technical scheme of the invention is high, the activity index in 7 days is 77.92% -78.16%, and the activity index in 28 days is 79.34% -81.23%. The concrete prepared by the admixture prepared in the embodiment 26-28 of the invention has 28-day compressive strength of more than 32MPa, and can meet the use requirements. In the process of preparing concrete, the mass ratio of the addition amount of the admixture to the cement can reach 4:1, and the use amount of the admixture in the concrete is larger, so that the utilization rate of the waste natural stone can be greatly improved. The concrete prepared by the admixture prepared in the comparative examples 9 to 11 has a small compressive strength in 28 days, and the compressive strength in 28 days is only about 30 MPa. The fineness of the admixture prepared by the technical scheme of the invention is finer than that of cement particles, so that the cement particles are more dispersed, the pore structure of concrete can be improved, the porosity is reduced, the pore size is reduced, and the concrete forms a self-compact stacking system with a compact filling structure and a microscopic level, so that the comprehensive performance of the concrete is effectively improved, and the concrete not only has good physical and mechanical properties, but also improves the durability of the concrete. Meanwhile, the natural stone powder as an admixture replaces cement, so that the manufacturing cost is reduced, the hydration heat is reduced, the resource utilization rate is improved, and the ecological environment is protected.
Example 53
(1) Drying the waste blocky natural stone and then crushing for later use;
(2) Putting the stone powder obtained in the step (1) into a ball mill for pre-grinding treatment to ensure that the specific surface area reaches 700-800 m 2 Per kg, obtaining waste natural stone powder for later use;
(3) 60kg of waste natural stone powder, 20kg of mineral powder, 10kg of steel slag, 10kg of desulfurized gypsum, 2kg of sodium aluminate and NaOH are weighed 2 2kg, 0.5kg lignosulfonate, drying in a 50 ℃ forced air drying oven for 2h, adding into a ball mill, mixing and ball milling until the specific surface area is 600-800 m 2 Kg, to give a cement.
Example 54
(1) Drying the waste blocky natural stone and then crushing for later use;
(2) Putting the stone powder obtained in the step (1) into a ball mill for pre-grinding treatment to ensure that the specific surface area of the stone powder reaches 700-800 m 2 Per kg, obtaining waste natural stone powder for later use;
(3) Weighing 50kg of waste natural stone powder, 30kg of mineral powder, 8kg of steel slag, 8kg of desulfurized gypsum, 1kg of sodium aluminate 2 1kg of the high-efficiency water reducing agent containing sulfamate 0.2kg is put into a forced air drying oven at 50 ℃ for drying for 2 hours, and then added into a ball mill for mixing and ball milling until the specific surface area is 600-800 m 2 Kg, to give a cement.
Example 55
(1) Drying the waste blocky natural stone and then crushing for later use;
(2) Putting the stone powder obtained in the step (1) into a ball mill for pre-grinding treatment to ensure that the specific surface area of the stone powder reaches 700-800 m 2 Per kg, obtaining waste natural stone powder for later use;
(3) Weighing 40kg of waste natural stone powder, 40kg of mineral powder, 5kg of steel slag, 10kg of desulfurized gypsum, 1kg of sodium aluminate, 1kg of KOH and 0.8kg of fatty acid-based superplasticizer, and drying in a 50 ℃ blast drying ovenDrying for 2h, adding the mixture into a ball mill, mixing and ball-milling the mixture until the specific surface area is 600-800 m 2 Kg, to give a cement.
Comparative example 12
Comparative example 12 is set on the basis of example 55, and the technical characteristics of comparative example 12 and example 55 are that no additive is added. The remaining technical features are the same as those of example 55.
Comparative example 13
Comparative example 13 is set on the basis of example 55, and comparative example 13 is different from example 55 in technical characteristics that no sodium aluminate is added. The remaining technical features are the same as those of example 55.
Comparative example 14
Comparative example 14 is set on the basis of example 55, and comparative example 14 is technically characterized by not adding KOH to example 55. The remaining technical features are the same as those of example 55.
Comparative example 15
In comparative example 15, a cement with a commercial designation of 42.5 was used as a cementing material.
According to GB/T17671-1999 cement mortar strength test method, pure cement and the cementing materials prepared in examples 53-55 and comparative examples 12-15 are prepared into mortar test strips according to the standard mortar mixing proportion, the water consumption is based on the mortar fluidity of 180 mm-200 mm, and the mortar test strips are horizontally placed in (20 +/-1) DEG C water and cured to 3d, 7d and 28d for respectively testing the flexural strength and the compressive strength of the mortar test strips. The results are shown in table 5 below:
TABLE 5 anti-bending and compression strength test meter for standard mortar test strip of cementing material
Figure BDA0003049364700000211
Figure BDA0003049364700000221
As can be seen from the experimental data in table 5, the present invention provides a method for preparing a cement using waste natural stones. From the test data, the breaking strength and compressive strength of the mortar test strip prepared from the cementing material synthesized in the embodiments 53 to 55 of the invention are not much different from those of the mortar test strip prepared from the Portland cement labeled 42.5 in the comparative example 15, and the 28-day compressive strength can reach about 40 MPa. Therefore, the cementing material prepared by the technical scheme of the invention can replace the cementing material in the prior art for use. Comparative example 12 is a cement prepared without adding an additive, comparative example 13 is a cement prepared without adding aluminate, and comparative example 14 is a cement prepared without adding an alkali activator. From the test results, it can be seen that the mortar test strips prepared from the gelled materials obtained in comparative examples 12 to 14 have low compressive strength and flexural strength, which are only about 20 MPa. Therefore, the strength of the prepared gelled material can not meet the use requirement without adding the additive or adding the aluminate or the alkaline activator in the additive.
The present invention has been further described with reference to specific embodiments, but it should be understood that the detailed description should not be construed as limiting the spirit and scope of the present invention, and various modifications made to the above-described embodiments by those of ordinary skill in the art after reading this specification are within the scope of the present invention.

Claims (2)

1. The building material prepared from the waste stone powder is characterized by comprising the following raw materials, by mass, 40-80 parts of the waste stone powder, 10-40 parts of mineral powder, 5-10 parts of steel slag, 5-10 parts of desulfurized gypsum and 1-5 parts of an additive; the building material is prepared by the following method: waste stone powder, mineral powder, steel slag, desulfurized gypsum and additive are mixed and ground until the specific surface area is 500-800 m 2 Per kg to obtain a building material;
the building material is an admixture and comprises the following raw materials in parts by weight: 60-80 parts of waste stone factory stone powder, 10-20 parts of mineral powder, 5-10 parts of steel slag, 5-10 parts of desulfurized gypsum, 1-2 parts of additive, quicklime accounting for 3-7% of the waste stone factory stone powder by mass and inorganic dispersant accounting for 0.2-0.5% of the waste stone factory stone powder by mass;
the admixture is prepared by the following method:
(1) Pulverizing the stone powder of the waste stone factory to the specific surface area of 500-600 m 2 Mixing quicklime and an inorganic dispersant, adding the mixture into ground waste stone mill stone powder, performing ball milling mixing, and aging to obtain modified waste stone mill stone powder;
(2) Mixing the waste stone factory stone powder, mineral powder, steel slag, desulfurized gypsum and additive modified in the step (1), and then ball-milling the mixture to 500-600 m 2 Per kg of admixture;
or the building material is an admixture and comprises the following raw materials in parts by weight: 70-80 parts of waste natural stone powder, 10-20 parts of mineral powder, 5-10 parts of steel slag, 5-10 parts of desulfurized gypsum and 1-5 parts of an additive;
the admixture is prepared by the following method:
(1) Respectively drying the waste natural stone powder, mineral powder, steel slag, desulfurized gypsum and additive until the water content of the raw materials is less than 1.0%;
(2) Weighing the waste natural stone powder, slag, steel slag, desulfurized gypsum and additive dried in the step (1), putting the waste natural stone powder, slag, steel slag, desulfurized gypsum and additive into a ball mill, mixing and ball-milling until the specific surface area is 600-800 m 2 Per kg, obtaining the admixture;
or the building material is a cementing material and comprises the following raw materials in parts by weight: 40-50 parts of waste stone factory stone powder, 20-40 parts of mineral powder, 5-10 parts of steel slag, 5-10 parts of desulfurized gypsum, 1-5 parts of additive, quicklime accounting for 3-7% of the waste stone factory stone powder by mass and inorganic dispersant accounting for 0.2-0.5% of the waste stone factory stone powder by mass;
the gel material is prepared by the following method:
(1) Pulverizing the stone powder of the waste stone factory to 550-600m of specific surface area 2 Per kg; mixing quicklime and an inorganic dispersant, adding the mixture into the crushed stone factory stone powder, mixing, ball-milling and aging to obtain modified waste stone factory stone powder;
(2) Mixing the modified waste stone factory stone powder, mineral powder, steel slag, desulfurized gypsum and additive in the step (1), and ball-milling until the specific surface area is 600-700 m 2 Kg, obtaining a cementitious materialFeeding;
or the building material is a cementing material and comprises the following raw materials in parts by weight: 40-60 parts of waste natural stone powder, 20-40 parts of mineral powder, 5-10 parts of steel slag, 5-10 parts of desulfurized gypsum and 1-5 parts of additive;
the gel material is prepared by the following method:
(1) Grinding the waste natural stone powder to ensure that the specific surface area reaches 700-800 m 2 (iv) kg; respectively drying the waste natural stone powder, the mineral powder, the steel slag, the desulfurized gypsum and the additive until the water content of the raw materials is less than 1.0%;
(2) Weighing the dried waste natural stone powder, slag, steel slag, desulfurized gypsum and additive in the step (1), putting the waste natural stone powder, the slag, the steel slag, the desulfurized gypsum and the additive into a ball mill, and mixing and ball-milling the mixture to 600-800 m 2 The gel material is obtained after the raw materials are subjected to the reaction; wherein the additive comprises an alkaline activator, aluminate and a water reducing agent, and the alkaline activator comprises NaOH and Ca (OH) 2 KOH and Na 2 SiO 3 The aluminate is sodium aluminate, and the water reducing agent is one or more of lignosulfonate, sulfamate-series high-efficiency water reducing agent, fatty acid-series high-efficiency water reducing agent and polycarboxylate-series high-efficiency water reducing agent;
the mass ratio of the alkali activator to the aluminate to the water reducing agent is (1-2): (1-2): (0.2-1).
2. The building material using waste stone powder according to claim 1, wherein the inorganic dispersant is one of sodium tripolyphosphate, sodium hexametaphosphate, and sodium pyrophosphate.
CN202110481301.0A 2021-04-30 2021-04-30 Building material prepared from waste stone powder Active CN115259722B (en)

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CN102745932A (en) * 2012-06-29 2012-10-24 张仲 Preparation method and application of PD composite mineral admixture containing silica fume
CN105366975A (en) * 2015-11-30 2016-03-02 武汉天意成再生资源有限公司 Non-calcinated solid waste high-activity mineral admixture and preparation method therefor
US11168029B2 (en) * 2017-01-10 2021-11-09 Roman Cement, Llc Use of mineral fines to reduce clinker content of cementitious compositions
CN111205003B (en) * 2020-01-19 2021-06-25 武汉理工大学 Preparation method of regenerated cementing material
CN111233364B (en) * 2020-03-06 2021-12-14 广州市圣丰混凝土有限公司 Composite mineral admixture, preparation method thereof and artificial sand concrete material containing composite mineral admixture

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