CN113500698A - Light early-strength magnesium-based cement concrete mixing equipment and application thereof - Google Patents
Light early-strength magnesium-based cement concrete mixing equipment and application thereof Download PDFInfo
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- CN113500698A CN113500698A CN202110575368.0A CN202110575368A CN113500698A CN 113500698 A CN113500698 A CN 113500698A CN 202110575368 A CN202110575368 A CN 202110575368A CN 113500698 A CN113500698 A CN 113500698A
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- cement concrete
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
- B28C5/18—Mixing in containers to which motion is imparted to effect the mixing
- B28C5/26—Mixing in containers to which motion is imparted to effect the mixing rotating about a vertical or steeply inclined axis during the mixing, e.g. comprising a flat bottomplate rotating about a vertical axis, co-operating with blades or stirrers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
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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
- C04B28/30—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 magnesium cements or similar 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
- C04B28/34—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 cold phosphate binders
- C04B28/346—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 cold phosphate binders the phosphate binder being present in the starting composition as a mixture of free acid and one or more phosphates
- C04B28/348—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 cold phosphate binders the phosphate binder being present in the starting composition as a mixture of free acid and one or more phosphates the starting mixture also containing one or more reactive oxides
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- 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
Abstract
The invention discloses light early-strength magnesium-based cement concrete mixing equipment and application thereof, wherein the equipment comprises a hopper, wherein a temperature control facility is arranged at the lower part of the hopper, and the temperature control facility can regulate and control the temperature in the hopper; the hopper is spindle-shaped and can axially rotate; a hopper cover is arranged at one end of the hopper, and the hopper is provided with a barometer and a thermometer; the other end of the hopper is provided with a rotating shaft, and the rotating shaft is in transmission connection with a motor; the temperature control facility comprises a material tank, and temperature control materials are arranged in the material tank, the device can be used for closely mixing the cement concrete, and the mixing can be carried out at different temperatures and pressures, so that the application range of the magnesium-based cement concrete is expanded; the equipment makes the fresh slurry fully hydrated and carbonized, improves the internal microstructure of the magnesium-based cement, and improves the compactness, macroscopic mechanical property and durability of the magnesium-based cement; meanwhile, the grain slag sand and the engineering slag soil can be directly applied to concrete products; so that the magnesium-based standard sand can replace quartz standard sand and participate in hydration reaction.
Description
Technical Field
The invention relates to concrete mixing equipment, in particular to lightweight early-strength magnesium-based cement concrete mixing equipment and application thereof.
Background
The magnesium-based cement comprises magnesium oxychloride cement, magnesium oxysulfate cement, magnesium phosphate cement and the like; the magnesium-based cement is low-carbon cement and has good development prospect. The magnesium-based cement generally has the characteristic of large hydration heat, and the large hydration heat generates temperature stress in the magnesium-based cement product to cause the magnesium-based cement product to crack; the problem of cracking of the Portland cement due to temperature stress also exists after the Portland cement is poured in a large volume; how to solve the problem that portland cement and magnesium-based cement crack due to temperature stress is a technical problem which always puzzles the academic and engineering circles.
The prior art discloses a scheme for solving the problems that dicalcium silicate and tricalcium silicate in steel slag are difficult to hydrate, and free magnesium oxide and calcium oxide cause the strength reduction of concrete due to carbonization volume expansion; but at present, the problems of hydration and insufficient early carbonization of magnesium-based cement concrete and silicate cement products are not solved.
The existing portland cement concrete is generally stirred in a normal-temperature normal-pressure non-closed environment, free water volatilizes during stirring, water in a newly-stirred slurry body is not fully utilized, the slurry body is fully hydrated, the stirring method limits the application range of the portland cement concrete and the magnesium-based cement concrete in regions, and the quality and the durability of the concrete after pouring can not be ensured by the existing stirring technology in high-cold and strong-wind dry plateau, polar climate and tropical climate with high heat and much rain.
Disclosure of Invention
The invention provides light early-strength magnesium-based cement concrete mixing equipment and application thereof, which at least solve the problems that magnesium-based cement concrete fresh slurry mixed by the existing mixing equipment is early hydrated and insufficiently carbonized, and cannot meet the requirement of cement concrete mixing in extreme climatic regions.
The invention provides light early-strength magnesium-based cement concrete mixing equipment which comprises a hopper, wherein a temperature control facility is arranged at the lower part of the hopper and can regulate and control the temperature in the hopper.
Further, the hopper is spindle-shaped and can axially rotate.
Furthermore, one end of the hopper is provided with a hopper cover, and the other end of the hopper is provided with a rotating shaft which is in transmission connection with a motor; the hopper is provided with a barometer and a thermometer.
Further, the temperature control facility comprises a material tank, and a temperature control material is arranged in the material tank.
Furthermore, a hopper cover is arranged at the upper part of the trough, the trough and the hopper cover are combined into a temperature control cabin, and the hopper is arranged in the temperature control cabin.
Further, the temperature control material is one or more of liquid nitrogen, dry ice, anthracite and coke.
Further, the hopper cover is provided with a closed locking mechanism; the silo is provided with a cabin door.
Further, the rotation speed of the hopper is 20-300 r/min;
the temperature in the temperature control cabin is-190-2000 ℃.
The application of the lightweight early-strength magnesium-based cement concrete mixing equipment is characterized by comprising the following steps of:
s101, uniformly stirring powder particles with the particle size smaller than 2.36mm in the magnesium-based cement concrete raw material;
s102, adding the powder of the S101 into closed mixing equipment for closed mixing of the light early-strength magnesium-based cement concrete;
and S103, adding the slurry mixed in the step S102, water and particles with the particle size larger than 2.36mm into closed mixing equipment for sealed mixing uniformly to obtain the light early-strength magnesium-based cement concrete.
Further, the magnesium-based cement concrete raw material comprises the following raw materials in parts by weight: 100 parts of magnesia, 0-140 parts of phosphate, 0-130 parts of magnesium salt, 0-15 parts of additive, 0-70 parts of phosphogypsum, 0-150 parts of magnesium-based standard sand, 0-50 parts of granulated slag sand, 0-90 parts of stones, 0-40 parts of engineering muck, 0-25 parts of dry ice and 0-50 parts of water;
the magnesite comprises light-burned magnesia and heavy-burned magnesia;
the magnesium-based standard sand consists of light-burned magnesia and heavy-burned magnesia which have different particles, and the fineness modulus of the magnesium-based standard sand is 3.5; the fineness modulus of the grain slag sand is 3.8; the sand content of the engineering residue soil is 23.16%, and the fineness modulus of the sand is 1.2;
the phosphate comprises one or two of monopotassium phosphate and ammonium dihydrogen phosphate, and is an industrial raw material;
the magnesium salt comprises one or two of magnesium sulfate heptahydrate and magnesium chloride hexahydrate, and the magnesium salt is an industrial grade raw material;
the additive is one or a combination of more of anhydrous citric acid, citric acid monohydrate, citric acid dihydrate, anhydrous sodium carbonate, anhydrous sodium citrate, sodium citrate dihydrate, borax, boric acid, oxalic acid and sodium oxalate, and is chemically pure;
the dry ice is in a shape of rice grains and has a length of 5mm-15 mm.
Compared with the prior art, the light early-strength magnesium-based cement concrete closed mixing device provided by the invention can mix under different temperatures and pressures, expands the use area space of cement concrete, particularly magnesium-based cement concrete products, can fully hydrate and carbonize the fresh cement concrete slurry at an early stage, improves the internal microstructure of the light early-strength magnesium-based cement concrete, and improves the compactness, the macroscopic mechanical property and the durability.
Drawings
FIG. 1 is a schematic top view of a closed mixing plant for light early strength magnesium-based cement concrete;
FIG. 2 is a left side view of a closed mixing plant for lightweight early strength magnesium-based cement concrete.
1, a hopper; 2, a hopper cover; 3, sealing the locking mechanism; 4, a bracket; 5, a barometer; 6, a thermometer; 7, a rotating shaft; 8, a motor; 9, a hopper control device; 10, a temperature control cabin; 11, a cabin door; 12, controlling the temperature; 13, a trough; and 14, a hopper cover.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
Example 1
The closed mixing equipment for the light early-strength magnesium-based cement concrete disclosed by the embodiment 1 comprises a closable hopper, wherein a temperature control facility is arranged at the lower part of the hopper, and the temperature control facility can regulate and control the temperature in the hopper.
According to the embodiment, the cement concrete raw materials can be placed in the hopper, the temperature and the pressure of the hopper are adjusted by the temperature control facility, so that the temperature and the pressure of the hopper are suitable for mixing the cement concrete.
Preferably, the hopper is spindle-shaped and can rotate axially.
Wherein, the hopper lower part is equipped with the frame, and this embodiment still is equipped with controlling means, and control hopper is rotatory, regulation and control temperature.
When this embodiment hopper shape does benefit to the hopper rotation, the raw materials are stirred in the hopper, simple structure, convenient to use.
Preferably, hopper one end is equipped with the hopper lid, and the other end is equipped with the pivot, the pivot links to each other with motor drive, the hopper is equipped with barometer, thermometer.
This embodiment hopper internal seal improves moisture, temperature utilization and rates, can understand pressure, temperature in the hopper directly perceivedly simultaneously to obtain the raw materials mixing condition, and carry out the adjustment.
Preferably, the temperature control facility comprises a material tank, and a temperature control material is arranged in the material tank.
Preferably, a hopper cover is arranged at the upper part of the trough, the trough and the hopper cover are combined into a temperature control cabin, and the hopper is arranged in the temperature control cabin.
Wherein the hopper cover is provided with a closed locking mechanism; the silo is provided with a cabin door at the position below the hopper.
Wherein the temperature control material is one or more of liquid nitrogen, dry ice, anthracite and coke. Dry ice is preferred in the mixing of magnesium based cement.
The convenient hopper temperature of adjusting of this embodiment, make full use of simultaneously and energy saving, simple structure, it is convenient to implement.
Preferably, the rotation speed of the hopper is 20-300 r/min;
the temperature in the temperature control cabin is-190-2000 ℃.
Example 2, 3 application of a closed mixing device for light early strength magnesium-based cement concrete, comprising the following steps:
s101, weighing powder particles with the particle size of less than 2.36mm in the magnesium-based cement concrete raw material according to a proportion and then uniformly stirring;
s102, adding the powder of the S101 into closed mixing equipment for light early-strength magnesium-based cement concrete to carry out closed mixing;
and S103, adding the slurry of the S102, water and particles with the particle size larger than 2.36mm into closed mixing equipment for mixing uniformly in a closed manner, wherein the slurry after mixing can be poured or 3D printed.
Comparative examples 1 and 2 were prepared by a conventional method using a conventional concrete mixer.
The magnesium-based cement concrete raw materials of the embodiment 2 and the comparative example 1 comprise the following raw materials in parts by weight: 100 parts of light-burned magnesium oxide, 130 parts of magnesium sulfate heptahydrate, 5 parts of anhydrous citric acid, 50 parts of phosphogypsum, 100 parts of magnesium-based standard sand, 20 parts of granulated slag sand, 80 parts of stones, 30 parts of engineering slag soil, 15 parts of dry ice and 10 parts of water.
The magnesium-based cement concrete formula of the embodiment 3 and the comparative example 2 comprises the following raw materials in parts by weight: 100 parts of magnesia, 50 parts of phosphate, 100 parts of magnesium salt, 8 parts of citric acid monohydrate, 70 parts of phosphogypsum, 150 parts of magnesium-based standard sand, 50 parts of granulated slag sand, 50 parts of stones, 40 parts of engineering slag soil, 20 parts of dry ice and 20 parts of water;
wherein, the magnesite in the embodiment 2-3 and the comparison example 1-2 comprises light-burned magnesia and heavy-burned magnesia;
the magnesium-based standard sand consists of light-burned magnesia and heavy-burned magnesia which have different particles.
The fineness modulus of the magnesium-based standard sand is 3.5; the fineness modulus of the grain slag sand is 3.8; the sand content of the engineering residue soil is 23.16%, and the fineness modulus of the sand is 1.2; the content of the magnesium sulfate heptahydrate is 98 percent, and the fineness is 48 mu m; the additive is chemically pure; the dry ice is in a shape of rice grains and has a length of 10 mm.
In the examples 2 and 3, the rotation speed of the hopper is 50r/min, and the temperature in the temperature-controlled cabin is-60 ℃.
Performance test control:
the performance test comparison of the mixed Mg-based cement concrete of the examples 2-3 and the comparative examples 1-2 is shown in Table 1.
TABLE 1 results of performance test of magnesium-based cement concrete blended in examples 2-3 and comparative examples 1-2
Through the performance detection comparison of the embodiment and the comparison example, the fluidity of the light early-strength magnesium-based cement blended by the equipment is greatly improved compared with that of the comparison example blended by cement; the equipment can mix various cement concretes in a closed way, the mixing temperature and pressure can be adjusted, and the application region range of various cements, especially magnesium-based cement concrete, is expanded; the equipment makes the fresh slurry fully hydrated and carbonized, improves the microstructure in the magnesium-based cement, improves the compactness, the macroscopic mechanical property and the durability of the magnesium-based cement, improves the quality of cement concrete and prolongs the service life of the cement concrete.
The water granulated slag sand in a steel plant generally needs to be ground into mineral powder to be utilized, and an effective technical scheme for directly utilizing the water granulated slag sand in a high-efficiency resource manner is lacked; at present, the quartz standard sand can only be used as an aggregate to participate in 3D printing additive manufacturing, and because the quartz standard sand cannot participate in hydration reaction, a bonding interface between the quartz standard sand and cement paste becomes a microscopic defect of hardened paste. Meanwhile, a large amount of construction waste is generated in China every year, more than 70 percent of the construction waste is engineering residue soil, the engineering residue soil is harmful impurities in silicate concrete, the construction residue soil cannot be directly added into the silicate concrete, and the engineering residue soil is difficult to be recycled.
The equipment of the invention can directly apply the grain slag sand and the engineering slag soil to concrete products; the magnesium-based standard sand replaces quartz standard sand and can participate in hydration reaction; makes a contribution to the building field and the reduction of carbon emission of the whole society, and has very obvious technical advantages and economic and ecological benefits.
Finally, it should be noted that the above-mentioned embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the modifications and equivalents of the specific embodiments of the present invention can be made by those skilled in the art after reading the present specification, but these modifications and variations do not depart from the scope of the claims of the present application.
Claims (10)
1. The light early-strength magnesium-based cement concrete mixing equipment is characterized by comprising a hopper, wherein a temperature control facility is arranged at the lower part of the hopper, and the temperature control facility can regulate and control the temperature in the hopper.
2. A lightweight early strength magnesium based cement concrete mixing plant as recited in claim 1, wherein said hopper is spindle shaped and axially rotatable.
3. A lightweight early strength magnesium based cement concrete mixing apparatus as recited in claim 1, wherein said hopper is provided with a hopper cover at one end, and a rotating shaft at the other end, said rotating shaft being drivingly connected to a motor; the hopper is provided with a barometer and a thermometer.
4. A lightweight early strength magnesium based cement concrete mixing plant as recited in claim 1, wherein said temperature control means includes a tank, said tank having temperature control material disposed therein.
5. The lightweight early strength magnesium based cement concrete mixing apparatus as recited in claim 4, wherein said trough is provided with a hopper cover at the top, said trough and hopper cover are combined into a temperature controlled compartment, and said hopper is provided in said temperature controlled compartment.
6. A lightweight early strength magnesium based cement concrete mixing apparatus as claimed in claim 5, wherein the temperature control material is one or more of liquid nitrogen, dry ice, anthracite, coke.
7. A lightweight early strength magnesium based cement concrete mixing plant as recited in claim 5, wherein said hopper cover is provided with a closed locking mechanism; the silo is provided with a cabin door.
8. A lightweight early strength magnesium based cement concrete mixing apparatus as claimed in claim 1, characterised in that the rotational speed of said hopper is 20 to 300 r/min;
the temperature in the temperature control cabin is-190-2000 ℃.
9. Use of a closed mixing plant of a lightweight early strength magnesium based cement concrete according to any one of claims 1 to 8, characterised in that it comprises the steps of:
s101, uniformly stirring powder particles with the particle size smaller than 2.36mm in the magnesium-based cement concrete raw material;
s102, adding the powder of the S101 into closed mixing equipment for closed mixing of the light early-strength magnesium-based cement concrete;
and S103, adding the slurry mixed in the step S102, water and particles with the particle size larger than 2.36mm into closed mixing equipment for sealed mixing uniformly to obtain the light early-strength magnesium-based cement concrete.
10. The use according to claim 9, wherein the magnesium-based cement concrete raw material comprises the following raw materials in parts by weight: 100 parts of magnesia, 0-140 parts of phosphate, 0-130 parts of magnesium salt, 0-15 parts of additive, 0-70 parts of phosphogypsum, 0-150 parts of magnesium-based standard sand, 0-50 parts of granulated slag sand, 0-90 parts of stones, 0-40 parts of engineering muck, 0-25 parts of dry ice and 0-50 parts of water;
the magnesite comprises light-burned magnesia and heavy-burned magnesia;
the magnesium-based standard sand consists of light-burned magnesia and heavy-burned magnesia which have different particles, and the fineness modulus of the magnesium-based standard sand is 3.5; the fineness modulus of the grain slag sand is 3.8; the sand content of the engineering residue soil is 23.16%, and the fineness modulus of the sand is 1.2;
the phosphate comprises one or two of monopotassium phosphate and ammonium dihydrogen phosphate, and is an industrial raw material;
the magnesium salt comprises one or two of magnesium sulfate heptahydrate and magnesium chloride hexahydrate, and the magnesium salt is an industrial grade raw material;
the additive is one or a combination of more of anhydrous citric acid, citric acid monohydrate, citric acid dihydrate, anhydrous sodium carbonate, anhydrous sodium citrate, sodium citrate dihydrate, borax, boric acid, oxalic acid and sodium oxalate, and is chemically pure;
the dry ice is in a shape of rice grains and has a length of 5mm-15 mm.
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| CN202110575368.0A CN113500698A (en) | 2021-05-26 | 2021-05-26 | Light early-strength magnesium-based cement concrete mixing equipment and application thereof |
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