CN113860768A - Paste filling cementing material and paste filling slurry - Google Patents
Paste filling cementing material and paste filling slurry Download PDFInfo
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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
- C04B7/00—Hydraulic cements
- C04B7/345—Hydraulic cements not provided for in one of the groups C04B7/02 - C04B7/34
- C04B7/3456—Alinite cements, e.g. "Nudelman"-type cements, bromo-alinite cements, fluoro-alinite cements
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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
- C04B28/02—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
- C04B28/028—Alinite cements, i.e. "Nudelman"-type cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/17—Mixtures thereof with other inorganic cementitious materials or other activators with calcium oxide containing activators
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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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
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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
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of mining engineering, and particularly discloses a pasty filling cementing material and pasty filling slurry. The paste filling cementing material comprises the following components in percentage by mass: high alite portland cement clinker: 55-65%, steel slag: 25 to 35 percent of nano SiO2: 2% -5% of nano CaCO3:2 to 3 percent of modified gypsum, 2 to 6 percent of modified gypsum and 0.1 to 0.5 percent of composite additive. The invention takes the industrial solid waste steel slag as the raw material, has simple process, not only greatly reduces the production cost, provides guarantee for green mining of mines, but also provides industrial solid waste steel slagThe comprehensive utilization of the solid waste provides a new way. The paste filling cementing material is used for preparing paste filling slurry, and the problems of low early strength, poor slurry fluidity, high cost and energy consumption and the like of the paste filling material are solved.
Description
Technical Field
The invention relates to the technical field of mining engineering, in particular to a pasty filling cementing material and pasty filling slurry.
Background
The solid matters discarded by the steel making industry are called steel slag, and the accumulated amount of the Chinese steel slag reaches nearly 20 hundred million tons by 2020. Because the early strength and the stability of the steel slag are low, the total utilization rate of the steel slag in China is only about 22 percent, and the long-term discharge of the steel slag causes a large amount of occupied land and serious environmental pollution, so that how to realize sustainable and high-efficiency utilization of the steel slag is urgent.
On the other hand, most of domestic mines adopt a paste filling mining method for mining, so that the ground pressure activity of the mines can be effectively controlled, and the problem of how to mine 'three lower' coal resources is effectively solved. The key point of the paste filling mining method lies in the performance of a paste filling material, and the currently commonly used paste filling material is a paste slurry material which is prepared by mixing coal mine waste rock serving as a main material with solid wastes such as power plant fly ash and the like according to a certain proportion and then adding components such as cement, an additive and the like. However, the paste filling material has the following disadvantages: (1) the paste filling requires high slurry concentration, so that the slurry has poor fluidity and is easy to block pipes, a high-power filling pump is needed for conveying the slurry, and the requirements on filling processes and equipment are high; (2) the cement consumption is high, so that the production cost is improved, the carbon emission in the cement industry is second to that in the power industry, the problems of resource consumption and ecological damage are obvious, and the environmental protection pressure is extremely high; (3) the early strength of the paste filling body is low, and the application range of the paste filling body is limited.
Disclosure of Invention
In view of the above, the invention provides a paste filling cementing material and a paste filling slurry, which promote the early crystallization nucleation of the hydration of the paste cementing material by adopting a composite additive formed by naphthalenesulfonate, sodium carbonate and calcium hydroxide, and solve the problems of low early strength, poor slurry fluidity, high cost and energy consumption and the like of the paste filling material.
In order to achieve the purpose of the invention, the embodiment of the invention adopts the following technical scheme:
the application provides a paste filling cementing material, which comprises the following components in percentage by mass: high alite portland cement clinker: 55-65%, steel slag: 25 to 35 percent of nano SiO2: 2% -5% of nano CaCO3:2 to 3 percent of modified gypsum, 2 to 6 percent of modified gypsum and 0.1 to 0.5 percent of composite additive; the composite additive is a mixture of naphthalene sulfonate, sodium carbonate and calcium hydroxide.
Compared with the prior art, the paste filling cementing material provided by the application has the following advantages:
under the action of the composite additive, the steel slag and the high-alite silicate cement clinker in the paste filling cementing material promote early crystallization nucleation of hydration of the paste cementing material, so that the early strength is improved; meanwhile, the diffusion of cement hydration products is inhibited, the structure of the hydration products is more compact, and microscopic gaps between cement particles and the hydration products are not easy to appear, so that the cement paste filling material has good effects on the improvement of the strength and the microstructure of the paste filling material; in addition, the additive can promote the generation of hydrates such as ettringite and the like, change the flocculation structure of particles, increase the free water amount, reduce the coagulation speed, ensure that materials are uniformly mixed and can fully react, and ensure that the slurry has good fluidity; in addition, the nano silicon dioxide and the nano calcium carbonate are added to cooperate with a composite additive, so that the early strength and the stability of the paste cementing material are further improved.
The method takes the industrial solid waste steel slag as the raw material, has simple process, not only greatly reduces the production cost, provides guarantee for green mining of mines, but also provides a new way for comprehensive utilization of industrial solid waste.
Optionally, the mass ratio of the naphthalene sulfonate to the sodium carbonate to the calcium hydroxide is 5-6: 1-3.
Because of steel slag and nano SiO2And nano CaCO3The addition of the additive can increase the viscosity of the slurry, so that the composite additive formed by naphthalene sulfonate, sodium carbonate and calcium hydroxide in a specific proportion is adopted to promote the generation of hydrates such as ettringite and the like, change the flocculation structure of particles, release water held by fine powder particles (such as nano silicon dioxide and nano calcium carbonate), increase the free water amount, reduce the coagulation speed, ensure that the materials are uniformly mixed and can fully react, and ensure that the slurry has good fluidity.
Optionally, the high alite portland cement clinker has a specific surface area of 300m2/Kg～400m2/Kg。
The preparation method of the high-alite portland cement clinker comprises the following steps:
weighing the components in the following proportion: 78-87% of limestone raw material, 6-19% of lead-zinc tailings, 2-11% of shale and 3-5% of furnace slag;
crushing and grinding the components, and uniformly mixing to obtain a raw material;
preheating by a suspension preheater, and then feeding the raw materials into a cement kiln to calcine until part of the raw materials are molten, wherein the calcining temperature is 1400-1550 ℃, and the calcining time is 30-50 min, so as to obtain clinker;
and (3) quenching the clinker to room temperature, and grinding in a ball mill to obtain the high-alite silicate cement clinker.
The shale has low alkali content, high aluminum content, low aluminum content in lead-zinc tailings and high silicon content, and the cement clinker with high alite content suitable for rotary kiln production is prepared by reasonably matching the shale with the lead-zinc tailings.
The optimized preparation method ensures that the content of tricalcium silicate in the high-alite cement clinker is up to 66 percent, and the content of free calcium oxide is lower than 1.3 percent, thereby providing a foundation for obtaining the paste filling cementing material with short setting time and high early strength.
Optionally, the alkalinity of the steel slag is more than 1.8 and less than 3, the content of free CaO is 2 to 3 weight percent, and the specific surface area is 450m2/Kg～550m2/Kg。
The preparation method of the steel slag comprises the following steps:
the high-temperature liquid steel slag is cooled to 300-500 ℃ on the ground by water or naturally, then is filled into a hot stuffy tank, and simultaneously water is added into the hot stuffy tank, so that free calcium oxide and free magnesium oxide in the steel slag respectively react with the water to generate calcium hydroxide and magnesium hydroxide, the content of the free calcium oxide and the content of the free magnesium oxide are greatly reduced, and the stability of the steel slag is further improved.
The preferable steel slag enables the cementing material to reduce the hydration heat release rate and the hydration heat in the acceleration period, thereby reducing the heat release in the paste filling slurry and the thermal stress, and further reducing the probability of the occurrence of cracks.
Optionally, the nano CaCO3The particle size of (A) is 10 nm-100 nm.
Preferred nano CaCO3Can provide crystal nucleus of early hydration product and promote C3Hydration of S improves the early strength of the cementing material slurry; part of nano CaCO along with the progress of hydration reaction3Can be mixed with C in paste filling slurry3A reacts to generate calcium monocarbonate aluminate which is arranged in the slurry in a lamellar and irregular mode and reacts with unreacted nano CaCO3The particles are filled in gaps of the paste filling slurry, and the slurry is helped to form a continuous and compact solidified body.
Optionally, the nano SiO2The particle size of (A) is 1nm to 100 nm.
Further optionally, the nano SiO2Has a particle diameter of 15 nm.
Preferred nano SiO2Can react with hydration products Ca (OH)2The reaction is carried out to generate C-S-H gel, thereby reducing Ca (OH)2Content and refinement of Ca (OH)2The crystal size promotes the hydration process of the cement-based material, so that the early strength of the paste filling material is improved; and nano SiO2The surface active bonds are more, and can be used as 'seed crystals' in the hydration process, so that the hydration process does not need to have a 'process of forming C-S-H stable crystal nucleus', but directly on the nano SiO2Surface of (2) continuing to growThe long and formed C-S-H phase changes the loose calcium silicate hydrate gel into a network structure with nano particles as cores to form an optimal state of an integral, uniform and compact secondary interface, thereby improving the early strength of the paste filling material.
Optionally, the fineness of the modified gypsum is 70-90 μm.
Further optionally, the fineness of the modified gypsum is 80 μm, and the negative pressure screen residue is less than 2%.
The optional pretreatment process of the modified gypsum comprises the following steps: heating the mixture to 100-150 ℃/50-70 min to expel about 75% of water contained in the chemical structure of the mixture, wherein the reaction of dehydration is as follows:
CaSO4·2H2o + Heat → CaSO4·1/2H2O+11/2H2O (steam)
Alpha hemihydrate and beta hemihydrate with basically consistent chemical structures can be generated through dehydration, so that the crystal of the desulfurized gypsum is completely developed and grows compactly, and the desulfurized gypsum has excellent performances in the aspects of setting time, standard consistency, strength and the like.
The second aspect of the present application provides a paste filling slurry, which comprises the following components by mass: the paste filling cementing material comprises the following components: 5% -8%, gangue: 40-50%, fly ash 20-25% and water: 20 to 30 percent.
The steel slag and the cement in the pasty filling cementing material are used as 'coarse aggregates', and the nano SiO2And nano CaCO3The filling material has excellent micro-filling effect, can reduce the total porosity in the cement-based material, effectively refine the pores and reduce the critical pore diameter, thereby improving the compactness and the durability of the paste filling material.
The paste filling slurry has the characteristics of no critical flow rate and no dehydration, and has the following specific indexes:
(1) fluidity, the slump of the prepared paste filling slurry is more than 180 mm;
(2) setting time: calculating from the beginning of adding water and mixing, standing for 2h, wherein the slurry has no obvious layering and the slump is more than 150 mm;
(3) standing bleeding rate: 3% -5%;
(4) the compressive strength is 0.5MPa to 1MPa in 1d uniaxial compressive strength, and 10MPa to 15MPa in 28d tensile strength.
Optionally, the particle size of the gangue is less than 10 mm.
Optionally, the content of the gangue with the particle size less than or equal to 5mm in the gangue is 35-45%.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The embodiment of the invention provides a paste filling cementing material which comprises the following components in percentage by mass: high alite portland cement clinker: 55%, steel slag: 34.5% of nano SiO2: 5% of nano CaCO3:2 percent of modified gypsum and 0.5 percent of composite additive.
The composite additive is naphthalene sulfonate, sodium carbonate and calcium hydroxide in a mass ratio of 5:2: 2.
The preparation method of the high-alite portland cement clinker comprises the following steps:
weighing the components in the following proportion: 78% of limestone raw material, 8% of lead-zinc tailings, 11% of shale and 3% of slag;
crushing and grinding the components, and uniformly mixing to obtain a raw material;
preheating by a suspension preheater, and then feeding the raw materials into a cement kiln to calcine until part of the raw materials are molten, wherein the calcining temperature is 1400-1450 ℃, and the calcining time is 30min, so as to obtain clinker;
rapidly cooling the clinker to room temperature, and grinding in a ball mill until the specific surface area is 350m2/Kg～400m2and/Kg, obtaining the high alite Portland cement clinker.
The steel slag has basicity of 1.9, free CaO content of 2 wt%, and specific surface area of 500m2/Kg～550m2/Kg。
The above-mentioned nano CaCO3The particle size of (A) is 10 nm-30 nm.
The above-mentioned nano SiO2The particle size of (A) is 15 nm-20 nm.
The treatment process of the modified gypsum comprises the following steps: the desulfurized gypsum is heated to 100 ℃ to 150 ℃/1 hour to drive off about 75% of the water contained in its chemical structure.
Example 2
The embodiment of the invention provides a paste filling cementing material which comprises the following components in percentage by mass: high alite portland cement clinker: 60%, steel slag: 30% of nano SiO2: 3% of nano CaCO3:3 percent of modified gypsum and 0.2 percent of composite additive.
The composite additive comprises naphthalene sulfonate, sodium carbonate and calcium hydroxide in a mass ratio of 6:3: 3.
The preparation method of the high-alite portland cement clinker comprises the following steps:
weighing the components in the following proportion: 87% of limestone raw material, 6% of lead-zinc tailings, 4% of shale and 3% of furnace slag;
crushing and grinding the components, and uniformly mixing to obtain a raw material;
preheating by a suspension preheater, and then feeding the raw materials into a cement kiln to calcine until partial melting, wherein the calcining temperature is 1500-1550 ℃, and the calcining time is 40min, so as to obtain clinker;
quenching the clinker to room temperature, and grinding in a ball mill until the specific surface area is 300m2/Kg～350m2and/Kg, obtaining the high alite Portland cement clinker.
The steel slag has basicity of 2.5, free CaO content of 3 wt% and specific surface area of 450m2/Kg～500m2/Kg。
The above-mentioned nano CaCO3The particle size of (A) is 30 nm-50 nm.
The above-mentioned nano SiO2The particle size of (A) is 30-60 nm.
The treatment process of the modified gypsum comprises the following steps: the desulfurized gypsum is heated to 100 ℃ to 150 ℃/1 hour to drive off about 75% of the water contained in its chemical structure.
Example 3
The embodiment of the invention provides a paste filling cementing material which comprises the following components in percentage by mass: high alite portland cement clinker: 64.9%, steel slag: 25% of nano SiO2: 2% of nano CaCO3:2 percent of modified gypsum and 0.1 percent of composite additive.
The composite additive comprises naphthalene sulfonate, sodium carbonate and calcium hydroxide in a mass ratio of 5:1: 1.
The preparation method of the high-alite portland cement clinker comprises the following steps:
weighing the components in the following proportion: 80% of limestone raw material, 15% of lead-zinc tailings, 2% of shale and 3% of furnace slag;
crushing and grinding the components, and uniformly mixing to obtain a raw material;
preheating by a suspension preheater, and then feeding the raw materials into a cement kiln to calcine until part of the raw materials are molten, wherein the calcining temperature is 1450-1500 ℃, and the calcining time is 50min, so as to obtain clinker;
quenching the clinker to room temperature, and grinding in a ball mill until the specific surface area is 300m2/Kg～350m2and/Kg, obtaining the high alite Portland cement clinker.
The steel slag has basicity of 2.9, free CaO content of 2.5 wt% and specific surface area of 450m2/Kg～470m2/Kg。
The above-mentioned nano CaCO3The particle size of (A) is 50 nm-100 nm.
The above-mentioned nano SiO2The particle size of (A) is 60 nm-100 nm.
The treatment process of the modified gypsum comprises the following steps: the desulfurized gypsum is heated to 100 ℃ to 150 ℃/1 hour to drive off about 75% of the water contained in its chemical structure.
Example 4
The embodiment provides paste filling slurry which comprises the following components in percentage by mass: the above-described paste-filled cementitious material prepared in example 1: 5% and gangue: 46%, fly ash 23% and water: 26 percent.
Example 5
The embodiment provides paste filling slurry which comprises the following components in percentage by mass: the above-described paste-filled cementitious material prepared in example 2: 8% of gangue: 40%, fly ash 25% and water: 27 percent.
Example 6
The embodiment provides paste filling slurry which comprises the following components in percentage by mass: the above-described paste-filled cementitious material prepared in example 3: 7% of gangue: 50%, fly ash 20% and water: 23 percent.
In order to better illustrate the technical solution of the present invention, further comparison is made below by means of a comparative example and an example of the present invention.
Comparative example 1
The comparative example provides a paste filling cementing material, which comprises the following components in percentage by mass: ordinary portland cement clinker: 55%, steel slag: 34.5% of nano SiO2: 5% of nano CaCO3:2 percent of modified gypsum and 0.5 percent of composite additive.
The steel slag and the nano SiO2Nano CaCO, nano-grade CaCO3The parameters of the modified gypsum and the composite admixture are the same as those of example 1 and are not described in detail.
The ordinary portland cement clinker manufacturer is from the company chenge kuning cement limited.
Comparative example 2
The comparative example provides a paste filling cementing material, which comprises the following components in percentage by mass: high alite portland cement clinker: 55%, steel slag: 34.5% of nano SiO2: 5% of nano CaCO3:2 percent to percent, 2 percent of modified gypsum and 0.5 percent of composite additive.
The high alite silicate cement clinker, steel slag and nano SiO2Nano CaCO, nano-grade CaCO3And the parameters of the modified gypsum were the same as those of example 1 and are not described in detail.
The composite additive is lignosulfonate, sodium carbonate and calcium hydroxide in a ratio of 5:2: 2.
Comparative example 3
The comparative example provides a paste filling slurry, which comprises the following components in percentage by mass: the above-described paste-filled cementitious material prepared in comparative example 1: 5% and gangue: 46%, fly ash 23% and water: 26 percent.
Comparative example 4
The comparative example provides a paste filling slurry, which comprises the following components in percentage by mass: the above-mentioned paste-filled cementitious material prepared in comparative example 2: 5% and gangue: 46%, fly ash 23% and water: 26 percent.
Comparative example 5
The comparative example provides a paste filling slurry, which comprises the following components in percentage by mass: paste filling cementing material: 5% and gangue: 46%, fly ash 23% and water: 26 percent.
The paste filling cementing material is produced by Shandong De Cheng in the mining engineering materials Co., Ltd and named as coal mine filling cementing powder.
In order to better illustrate the characteristics of the paste-filled cementitious material provided in the embodiment of the present invention, the paste-filled slurries prepared in the embodiments 4 to 6 and the comparative examples 3 to 5 were subjected to performance tests, and the test results are shown in table 1 below. As can be seen from Table 1, the paste filling slurry prepared by the method has high early strength and excellent slurry fluidity, the 1d uniaxial compressive strength of the paste filling slurry reaches 0.81MPa, the 28d strength of the paste filling slurry reaches 12.14MPa, the initial slump value reaches 192mm, and the slump value after standing for 2 hours is 165 mm.
TABLE 1 test results
Note: the 1d strength, the 3d strength, the 7d strength and the 28d strength are all uniaxial compressive strength, and the detection method is carried out according to GB/T17671-1999.
The detection method of the slump value is carried out according to GB/T50080-2016.
The paste filling slurries prepared in the embodiments 4 to 6 all have the characteristics of no critical flow rate and no dehydration, and meet the following indexes:
(1) fluidity, the slump of the prepared paste filling slurry is more than 180 mm;
(2) setting time: calculating from the beginning of adding water and mixing, standing for 2h, wherein the slurry has no obvious layering and the slump is more than 150 mm;
(3) standing bleeding rate: 3 to 5 percent.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A paste filling cementing material is characterized in that: the composite material comprises the following components in percentage by mass: high alite portland cement clinker: 55-65%, steel slag: 25 to 35 percent of nano SiO2: 2% -5% of nano CaCO3:2 to 3 percent of modified gypsum, 2 to 6 percent of modified gypsum and 0.1 to 0.5 percent of composite additive; the composite additive is a mixture of naphthalene sulfonate, sodium carbonate and calcium hydroxide.
2. The paste-filled cementitious material of claim 1, wherein: the mass ratio of the naphthalenesulfonate, the sodium carbonate and the calcium hydroxide is 4-6: 1-3.
3. The paste-filled cementitious material of claim 1, wherein: the specific surface area of the high-alite Portland cement clinker is 300m2/Kg～400m2/Kg。
4. The paste-filled cementitious material of claim 1, wherein: the alkalinity of the steel slag is more than 1.8 and less than 3, the content of free CaO is 2 to 3 weight percent, and the specific surface area is 450m2/Kg～550m2/Kg。
5. The paste-filled cementitious material of claim 1, wherein: the nano CaCO3The particle size of the (B) is 10 nm-100 nm; and/or
The nano SiO2The particle size of (A) is 1nm to 100 nm.
6. The paste-filled cementitious material of claim 1, wherein: the preparation method of the modified gypsum comprises the following steps: and dehydrating the desulfurized gypsum for 50-70 min at 100-150 ℃ to obtain the modified gypsum.
7. The paste-filled cementitious material according to claim 1 or 6, wherein: the fineness of the modified gypsum is 70-90 mu m.
8. A paste filling slurry characterized by comprising: the composite material comprises the following components in percentage by mass: the paste-filled cementitious material according to any one of claims 1 to 7: 5% -8%, gangue: 40-50%, fly ash 20-25% and water: 20 to 30 percent.
9. The paste filler slurry according to claim 8, wherein: the particle size of the gangue is less than 10 mm.
10. The paste filler slurry according to claim 9, wherein: the content of the gangue with the grain diameter less than or equal to 5mm in the gangue is 35-45 percent.
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| CN202111162701.1A CN113860768B (en) | 2021-09-30 | 2021-09-30 | Paste filling cementing material and paste filling slurry |
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| CN202111162701.1A CN113860768B (en) | 2021-09-30 | 2021-09-30 | Paste filling cementing material and paste filling slurry |
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| CN113860768A true CN113860768A (en) | 2021-12-31 |
| CN113860768B CN113860768B (en) | 2022-06-24 |
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| US20060288912A1 (en) * | 2002-12-24 | 2006-12-28 | Henghu Sun | Two-component wet cement, process and application thereof |
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| CN103342481A (en) * | 2013-07-08 | 2013-10-09 | 武汉理工大学 | Mine filling cementing material slurry and preparation method thereof |
| WO2020250141A1 (en) * | 2019-06-12 | 2020-12-17 | Holcim Technology Ltd | Process of preparing a cemented paste backfill material |
| CN113250744A (en) * | 2021-06-04 | 2021-08-13 | 许泽胜 | Application of coal-based solid waste filling material in filling and repairing of mine roadway |
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| CN1424275A (en) * | 2003-01-10 | 2003-06-18 | 中国矿业大学（北京校区） | Cementing materials for filling, slurry and preparing and filling processes |
| CN101492261A (en) * | 2008-12-17 | 2009-07-29 | 武汉钢铁(集团)公司 | Steel scoria tail mud composite slag micro mist agglutination material |
| CN101935172A (en) * | 2010-08-25 | 2011-01-05 | 武汉钢铁(集团)公司 | Roller steel slag fine aggregate and composite slag powder cemented material |
| CN103342481A (en) * | 2013-07-08 | 2013-10-09 | 武汉理工大学 | Mine filling cementing material slurry and preparation method thereof |
| WO2020250141A1 (en) * | 2019-06-12 | 2020-12-17 | Holcim Technology Ltd | Process of preparing a cemented paste backfill material |
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