CN113500687B - Method for curing magnesium-based cement concrete product and special system - Google Patents
Method for curing magnesium-based cement concrete product and special system Download PDFInfo
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- CN113500687B CN113500687B CN202110575370.8A CN202110575370A CN113500687B CN 113500687 B CN113500687 B CN 113500687B CN 202110575370 A CN202110575370 A CN 202110575370A CN 113500687 B CN113500687 B CN 113500687B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
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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
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00181—Mixtures specially adapted for three-dimensional printing (3DP), stereo-lithography or prototyping
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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
- C04B28/10—Lime cements or magnesium oxide cements
- C04B28/105—Magnesium oxide or magnesium carbonate 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
- C04B28/30—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
- C04B28/32—Magnesium oxychloride cements, e.g. Sorel cement
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a method and a special system for curing magnesium-based cement concrete products, which are used for carrying out temperature control carbonization curing, humidity control carbonization curing and storage carbonization curing on the magnesium-based cement concrete products; the method has the advantages that the magnesium-based cement concrete product is ensured to be in the environment with proper carbon dioxide gas concentration, carbon dioxide gas pressure, environment temperature and relative humidity in the hydration process, low-temperature curing and carbonization curing are combined, the microstructure in the magnesium-based cement is improved, and the compactness, macroscopic mechanical property and durability of the magnesium-based cement are improved; the maintenance method enables the grain slag sand and the engineering slag soil to be directly applied to concrete products; the magnesium-based standard sand can participate in hydration reaction instead of quartz standard sand; 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.
Description
Technical Field
The invention relates to concrete product curing, in particular to a magnesium-based cement concrete product curing method and a special system.
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 characteristics of high early hydration degree and early strength, and early temperature control and carbon dioxide curing of the magnesium-based cement are beneficial to reducing the temperature stress in the hardened slurry of the magnesium-based cement, so that early curing is particularly important; the 3D printing of the magnesium-based cement without the mold requires early temperature control and carbon dioxide curing of the printed product to reduce the occurrence of micro-cracks; the curing boxes on the market are mainly cured by presetting constant temperature or carbon dioxide gas with certain concentration, and cannot be cured at low temperature and by carbon dioxide according to the self hydration characteristics of magnesium-based cement, particularly curing systems of different magnesium-based cements in early period (within 3 days); there is a lack of curing methods and dedicated systems for different magnesium based cement products.
At present, a 3D printer in the field of buildings is designed based on a Portland cement-based material, magnesium-based cement has higher heat release rate and heat release amount than ordinary Portland cement after water is added, the requirements on 3D printers, particularly 3D printing nozzles are required to meet the requirements of magnesium-based cement carbonization reinforcement and hydration heat reduction, and the current 3D printer nozzles cannot meet the requirements.
In addition, the granulated slag sand in the steel plant generally needs to be ground into mineral powder to be utilized, and an effective technical scheme for directly utilizing the 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 the bonding interface between the quartz standard sand and cement paste becomes a microscopic defect of hardened paste due to the fact that the quartz standard sand cannot participate in hydration reaction.
Meanwhile, a large amount of construction waste is generated in China every year, more than 70 percent of the construction waste is engineering slag soil, and the construction slag soil is harmful impurities in silicate concrete and cannot be directly added into the silicate concrete, so that the problem of direct utilization of the engineering slag soil is difficult to solve at present.
Disclosure of Invention
The invention provides a method and a special system for curing magnesium-based cement concrete products, which at least solve the problems that in the prior art, a curing method and a special system for different magnesium-based cement products are lacked, grain slag sand and engineering slag soil cannot be directly utilized, and quartz standard sand cannot participate in hydration reaction.
The invention provides a method for curing magnesium-based cement concrete products, which comprises the following steps:
s101, setting a reference sample and a test sample for the concrete product;
s102, controlling temperature, carbonizing and maintaining, and adjusting the temperature of the sample according to the temperature of the reference sample; the concentration of carbon dioxide is 75-95% during the temperature control carbonization curing, and the pressure of carbon dioxide gas is 80-90 kPa; the temperature is lower than minus 60 ℃;
s103, carrying out humidity control carbonization curing on the concrete product cured in the step S102, wherein the relative humidity during the humidity control carbonization curing is 80-95%;
and S104, performing storage carbonization curing on the concrete product cured in the step S103, wherein the concentration of carbon dioxide is 80-95%, the temperature is 20-35 ℃, and the relative humidity is 80-96%.
Further, the wet-control carbonization curing is dry ice curing, and the temperature-control carbonization curing and storage carbonization curing is carbon dioxide gas curing;
the method comprises the following steps of preparing a reference sample, and pre-burying a temperature sensor in a concrete product before final setting; cutting the concrete product, wherein a reference sample with a temperature sensor is used as a reference sample, and a sample without the temperature sensor is used as a test sample;
the temperature control carbonization maintenance is carried out by connecting a temperature sensor of the reference sample with a temperature controller, and the temperature controller adjusts the temperature of the sample according to the temperature of the reference sample to carry out temperature control carbonization maintenance;
and when the surface temperature of the reference sample and the sample is reduced to the room temperature again, carrying out humidity-controlled carbonization maintenance on the reference sample and the sample.
A special system for curing magnesium-based cement concrete products comprises a temperature control carbonization chamber, a humidity control carbonization chamber and a storage carbonization chamber;
the temperature control carbonization chamber and the storage carbonization chamber are both provided with carbon dioxide devices, and the humidity control carbonization chamber is provided with a dry ice device.
Further, the temperature control carbonization chamber comprises a temperature controller, a cooling device and a heating device;
the temperature control carbonization chamber is provided with a reference sample placing table and a sample table; the temperature reducing device and the temperature raising device are positioned at the periphery of the sample table, the temperature controller is connected with the sample table through a temperature sensor, and the temperature reducing device and the temperature raising device are electrically connected with the temperature controller; dry ice is placed around the concrete product, and the concentration and the temperature of carbon dioxide in the temperature-controlled carbonization chamber are adjusted through the placement amount of the dry ice;
the humidity control carbonization chamber comprises a sample chamber, a dry ice storage chamber, a dry ice regulator and a relative humidity regulator; the sample chamber is connected with the dry ice storage chamber through a temperature sensor and a dry ice regulator; the sample chamber is connected with a relative humidity regulating instrument through a relative humidity sensor;
the storage curing room is provided with a temperature and humidity control instrument;
the carbon dioxide device comprises a carbon dioxide gas regulator, a carbon dioxide gas bottle and a carbon dioxide gas concentration sensor, and the carbon dioxide gas regulator is connected with the carbon dioxide gas bottle and the carbon dioxide gas concentration sensor.
Further, the maintenance system comprises an identification system, and the identification system comprises an identification device, an infrared volume measuring instrument, a quality measuring device and a classification screening machine.
Further, the maintenance system comprises a 3D printer;
3D printer is equipped with magnesium base cement special use and prints the shower nozzle, the shower nozzle includes: a hopper and a dry ice hopper; the dry ice hopper is connected with the hopper, a stirrer is arranged in the hopper, and the bottom of the hopper is connected with a nozzle;
a dry ice controller is arranged between the dry ice hopper and the hopper.
Further, the stirrer comprises a support rod and a spiral piece, the support rod is fixed at the bottom of the hopper, and the spiral piece is spirally fixed on the support rod;
the spiral piece is provided with at least one stirring blade.
When the stirring leaf is a plurality of, be close to the stirring leaf tip tilt up that the motor set up, the stirring leaf is close to the nozzle setting, stirring leaf tip downward sloping.
Further, the stirring blades are folded sheets which are convex outwards;
furthermore, an exhaust device is arranged at the middle lower part of the hopper, the exhaust device comprises an exhaust hole and an exhaust groove, and the exhaust groove is arranged at the lower part of the exhaust hole;
the exhaust hole is a filter screen, and the exhaust groove is annularly arranged with the hopper.
Furthermore, all the components of the special maintenance system are connected through a transmission device.
Compared with the prior art, the invention carries out temperature control carbonization curing, humidity control carbonization curing and storage carbonization curing on the magnesium-based cement concrete product, ensures that the magnesium-based cement concrete product is in the environment with proper carbon dioxide gas concentration, carbon dioxide gas pressure environment temperature and relative humidity in the hydration process, combines low-temperature curing and carbonization curing, improves the microstructure in the magnesium-based cement, and improves the compactness, the macroscopic mechanical property and the durability of the magnesium-based cement. The curing method can directly utilize the grain slag sand and the engineering slag soil into concrete products, and the magnesium-based standard sand can participate in the hydration reaction of the concrete instead of quartz standard sand, thereby contributing to the reduction of carbon emission in the building field and the whole society and having very obvious technical advantages and economic and ecological benefits.
Drawings
FIG. 1 is a flow chart of a system dedicated to magnesium-based cement concrete products.
FIG. 2 is a schematic view of a system dedicated to magnesium-based cement concrete products.
Fig. 3 is a schematic view of a magnesium-based cement 3D printer.
Fig. 4 is a schematic view of a magnesium-based cement 3D printing special nozzle.
Fig. 5 is a schematic view of an identifier for a mg-based cement concrete product.
FIG. 6 is a schematic view of a temperature controlled carbonization chamber for magnesium-based cement concrete products.
FIG. 7 is a schematic view of a humidity controlled carbonation chamber for a magnesium based cement concrete product.
FIG. 8 is a schematic view of a Mg-based cement concrete product storage curing room.
1, a spray head; 2, 3D printer support; 3, a motor; 4, controlling a motor wire; 5, a stirrer; 6, a hopper; 7, a nozzle; 8, a dry ice hopper; 9, a dry ice controller; 10, a 3D printing drive control system; 11, a support rod; 12, a helical sheet; 13, stirring blades; 14, a filter screen; 15, an exhaust groove; 16, dry ice; 17, a conveying device; 18, an identifier; 19, a temperature-controlled carbonization chamber; 20, a humidity control carbonization chamber; 21, storing and maintaining a room; 22, a print delivery device; 23, maintaining the conveying device; 24, a reference sample delivery device; 25, a conveying device; 26, an image recognition device; 27, an infrared volume meter; 28, a mass measuring device; 29, a classification screening machine; 30, controlling the display; 31, a reference sample placing table; 32, a sample stage; 33, a temperature controller; 34, a cooling device; 35, a temperature raising device; 36, a carbon dioxide gas bottle; 37, a carbon dioxide gas regulator; 38, a temperature-controlled carbonization display; 39, a temperature sensor; 40, a dry ice storage chamber; 41, a dry ice regulator; 42, a sample chamber; 43, carbon dioxide gas pressure sensor; 44, a pressure relief valve; 45, a carbon dioxide gas concentration sensor; 46, a relative humidity sensor; 47, relative humidity regulator; 48, a humidity controlled carbonation display; 49, a sample storage rack; 50, a temperature and humidity control instrument; and 51, storing and maintaining the display.
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.
Examples
The method for curing the magnesium-based cement concrete product in the embodiment of the invention is shown in figures 1 and 2 and comprises the following steps:
s101, setting a reference sample and a test sample for the concrete product;
s102, controlling temperature, carbonizing and maintaining, and adjusting the temperature of the sample according to the temperature of the reference sample; the concentration of carbon dioxide is 75-95% during the temperature control carbonization curing, and the pressure of carbon dioxide gas is 80-90 kPa; the temperature is lower than minus 60 ℃;
s103, performing humidity control carbonization curing on the concrete product cured in the step S102, wherein the relative humidity during the humidity control carbonization curing is 80-95%;
and S104, performing storage carbonization curing on the concrete product cured in the step S103, wherein the concentration of carbon dioxide is 80-95%, the temperature is 20-35 ℃, and the relative humidity is 80-96%.
Wherein the humidity control carbonization curing is dry ice curing, and the temperature control carbonization curing and storage carbonization curing is carbon dioxide gas curing;
s101, manufacturing a reference sample, and embedding a temperature sensor in a concrete product before final setting; cutting the concrete product, wherein a reference sample with a temperature sensor is used as a reference sample, and a sample without the temperature sensor is used as a test sample;
in the step S102, temperature control carbonization maintenance is performed, wherein a temperature sensor of the reference sample is connected with a temperature controller, and the temperature controller adjusts the temperature of the sample according to the temperature of the reference sample to perform temperature control carbonization maintenance; and when the surface temperature of the reference sample and the sample is reduced to the room temperature again, carrying out humidity-controlled carbonization maintenance on the reference sample and the sample.
This example in a carbon dioxide atmosphere, the gaseous carbon dioxide of the magnesium-based cement will undergo the following chemical reactions:
Mg(OH) 2 +CO 2 →MgCO 3 +H 2 O (2)
MgO+CO 2 +H 2 O→MgCO 3 +H 2 O (3)
2Mg 2+ +CO 3 2- +OH - +Cl - +3H 2 O→Mg 2 (CO 3 )Cl(OH)·3(H 2 O) (4)
because magnesium-based cement concrete products contain more unreacted magnesium oxide and magnesium hydroxide generated by reaction, the magnesium-based cement concrete products are beneficial to continuously carbonizing in carbon dioxide gas environments with certain temperature, humidity, concentration and pressure, the mechanical property and the water resistance of magnesium-based cement are enhanced, the carbon fixation amount of the magnesium-based cement concrete products is increased, greenhouse gases can be effectively reduced, and particularly, the carbon dioxide amount absorbed by each ton of magnesium-based cement 3D printed products is 11.76kg every year through a special magnesium-based cement 3D printing spray head and a special magnesium-based cement 3D printed product system.
Example 2, a magnesium-based cement concrete product curing special system, as shown in fig. 2, includes a temperature-controlled carbonization chamber, a humidity-controlled carbonization chamber, and a storage curing chamber;
the temperature control carbonization chamber and the storage curing chamber are both provided with carbon dioxide devices, and the humidity control carbonization chamber is provided with a dry ice device.
As shown in fig. 5 to 8, the system dedicated to mg-based cement concrete products comprises: a conveying device 17, an identifier 18, a temperature control carbonization chamber 19, a humidity control carbonization chamber 20 and a storage curing chamber 21;
the conveying device 17 comprises a printing conveying device 22 and a curing conveying device 23; the maintenance conveying device 23 includes: reference sample delivery device 24, delivery device 25; the printing and conveying device 22, the 3D printer and the identifier 18 are connected through a track; the curing and conveying device 23 is connected with the temperature control carbonization chamber 19, the humidity control carbonization chamber 20 and the storage curing chamber 21 through rails.
The identifier 18 includes: an image recognition device 26, an infrared volume measuring instrument 27, a quality measuring device 28, a classification screening machine 29 and a control display 30.
The temperature-controlled carbonization chamber 19 includes: a reference sample placing table 31, a sample table 32, a temperature controller 33, a temperature reducing device 34, a temperature raising device 35, a carbon dioxide gas bottle 36, a carbon dioxide gas regulator 37 and a temperature control carbonization display 38, wherein the temperature reducing device 34 and the temperature raising device 35 are positioned at the periphery of the sample table; the temperature controller 33 is connected with the sample table 32 through a temperature sensor 39, the temperature sensor 39 is embedded in a reference sample, the temperature controller 33 is connected with the reference sample through the temperature sensor 39, and the temperature reducing device 34 and the temperature increasing device 35 are connected with the temperature controller 33.
The wet-control carbonization chamber 20 comprises a dry ice storage chamber 40, a dry ice regulator 41, a sample chamber 42, a carbon dioxide gas pressure sensor 43, a pressure release valve 44, a carbon dioxide gas concentration sensor 45, a temperature sensor 39, a relative humidity sensor 46, a relative humidity regulator 47 and a wet-control carbonization display 48; the sample chamber 42 and the dry ice storage chamber 40 are connected through a pipeline with a valve; the sample chamber 42 is connected with a dry ice regulator 41 through a carbon dioxide gas concentration sensor 45, a carbon dioxide gas pressure sensor 43, a pressure relief valve 44 and a temperature sensor 39; the sample chamber 42 is connected to a relative humidity controller 47 via a relative humidity sensor 46.
The storage and maintenance room 21 comprises a sample storage rack 49, a carbon dioxide gas regulator 37, a temperature and humidity control instrument 50 and a storage and maintenance display 51, wherein the carbon dioxide gas regulator 37 is connected with a carbon dioxide gas bottle 36 and a carbon dioxide gas concentration sensor 45.
Wherein, during the specific maintenance: pre-embedding a temperature sensor 39 in a magnesium-based cement concrete product before final setting, cutting the magnesium-based cement concrete product into cubic test blocks of 40mm multiplied by 40mm, wherein the test block with the temperature sensor 39 is a reference sample, and the other test blocks are test samples; is transported to the identifier 18 by a print transport 22.
The image recognition device 26 comprises a camera with a photographing function and an image comparison recognition system, the camera photographs the magnesium-based cement concrete product and transmits the photograph to the image comparison recognition system, the image comparison recognition system compares the photograph photographed by the camera with a standard photograph and a reference sample photograph prestored in the image comparison recognition system, determines a reference sample and a sample of the magnesium-based cement concrete product according to color and appearance, and transmits a recognition result to the control display 30.
The infrared volume measuring instrument 27 measures the external volume of the magnesium-based cement concrete product and transmits the measurement result to the control display 30; the mass measuring device 29 weighs the mass of the mg-based cement concrete product and transmits the weighed result to the control display 30; the control display 30 automatically calculates the density of the magnesium-based cement concrete product according to the results measured by the infrared volume measuring instrument 27 and the quality measuring device 29, and judges the consistency by combining the magnesium-based cement concrete sample and the reference sample identified in the pattern identification device, and when the results are inconsistent, prompts to request manual judgment.
When the results are consistent, the identified reference sample and the sample are transmitted to a temperature control carbonization chamber through a maintenance transmission device; and after the surface temperature of the magnesium-based cement concrete product is reduced to room temperature, conveying the magnesium-based cement concrete product from the temperature control carbonization chamber to the humidity control carbonization chamber through the curing conveying device, and conveying the magnesium-based cement concrete product into the storage curing chamber for storage carbonization curing through the curing conveying device after curing for a certain age.
When temperature-controlled carbonization curing is carried out, dry ice is arranged around the magnesium-based cement concrete product in the temperature-controlled carbonization chamber, is in a shape of rice grains or rods, and has a length of 10-40 mm, so that the magnesium-based cement concrete sample chamber can reach the required carbon dioxide concentration, carbon dioxide pressure and temperature, and the magnesium-based cement concrete is carbonized more fully. The optimal carbon dioxide concentrations of the magnesium oxysulfate cement, the magnesium oxychloride cement and the magnesium phosphate cement during temperature-controlled carbonization curing are respectively 70%, 80% and 90%, and the carbon dioxide gas pressures are respectively 70kPa, 80kPa and 90 kPa; the temperature is minus 40 ℃, minus 50 ℃ and minus 60 ℃.
The dry ice regulator in the wet control carbonization chamber controls the adding amount of dry ice in the sample chamber through a carbon dioxide gas concentration sensor, a carbon dioxide gas pressure sensor and a temperature sensor; the relative humidity in the sample chamber is controlled by a relative humidity sensor and a relative humidity control instrument, so that the magnesium-based cement concrete sample chamber reaches proper relative humidity, and the optimal relative humidity in the magnesium oxysulfate cement sample chamber, the magnesium oxychloride cement test chamber and the magnesium phosphate cement sample chamber is 92%, 94% and 96% respectively.
The storage curing room regulates and controls the concentration, the temperature and the relative humidity of carbon dioxide in the storage curing room through a carbon dioxide gas regulator and a temperature and humidity regulator, the optimal carbon dioxide concentrations of the magnesium oxysulfate cement product storage curing room, the magnesium oxychloride cement product storage curing room and the magnesium phosphate cement product storage curing room are respectively 75%, 85% and 95%, the temperatures are respectively 10 ℃, 20 ℃ and 30 ℃, and the relative humidities are respectively 91%, 93% and 95%.
After the magnesium-based cement concrete of the embodiment is hardened, the storage curing room provides specific carbon dioxide concentration, temperature and relative humidity, so that the magnesium-based cement concrete can be continuously carbonized.
The special system of the embodiment of the invention is also provided with a magnesium-based cement 3D printing special nozzle, as shown in figures 3 and 4, the green magnesium-based cement concrete 3D printing special nozzle 1 is positioned on a 3D printer bracket 2, and the green magnesium-based cement concrete 3D printing special nozzle comprises: the automatic printing and drying machine comprises a motor 3, a motor control line 4, a stirrer 5, a hopper 6, a nozzle 7, a dry ice hopper 8 and a dry ice controller 9, wherein the motor 3 is connected with a 3D printing driving control system 10 through the motor control line 4, the stirrer 5 is positioned in the middle of the hopper 6, the hopper 6 is connected with the nozzle 7 through threads, the dry ice hopper 8 is connected with the dry ice controller 9, the dry ice controller 9 is connected with the hopper 6, and the dry ice controller 9 is connected with the motor control line 4; motor 3 fixes on 3D printer support 2, be connected for the detachable buckle between agitator 5 and the motor 3, be connected for the detachable buckle between hopper 6 and the 3D printer support 2.
The stirrer 5 comprises a supporting rod 11, a spiral sheet 12 and a stirring blade 13, wherein the supporting rod 11 is connected with the motor 3, the spiral sheet 12 is downwards coiled on the supporting rod 11, the stirring blade 13 is connected with the spiral sheet 12, the stirring blade 13 is in a shape of an outward convex folded sheet, the distance from one convex side of the stirring blade 13 to the inner wall of the hopper is 10mm, the stirring blade 13 is close to one end of the motor, the stirring blade 13 is upwards, the stirring blade 13 is close to one end of the nozzle, and the stirring blade 13 is downwards.
The middle part of the hopper 6 is provided with an exhaust groove 15 with a filter screen 14, the diameter of the mesh of the filter screen 14 is 35-74 μm, the width of the exhaust groove 15 is 10mm, and the height is 20 mm.
The exhaust groove is formed in the nozzle, so that bubbles generated in the stirring process of the slurry in the stirrer and larger carbon dioxide bubbles generated by volatilization of dry ice are guaranteed to be discharged from the slurry before the slurry is printed, a certain amount of carbon dioxide gas required by later carbonization is contained in a magnesium-based cement concrete product printed by 3D, and the influence of the larger bubbles on the printing performance, strength and durability of the magnesium-based cement 3D printed product is controlled.
According to the embodiment, the dry ice hopper and the dry ice controller are arranged on the 3D printing sprayer, the dry ice is added in the printing process to provide required carbon dioxide for magnesium-based cement carbonization, the temperature of the dry ice is lower than minus 60 ℃ and absorbs heat in the volatilization process, the carbonization of the magnesium-based cement in the 3D printing process and the requirement for reducing hydration heat are met, the temperature stress caused by overlarge temperature difference between the inside and the outside of a sample is avoided, the occurrence of micro cracks in the sample caused by the temperature stress is reduced, the early-stage carbon fixation amount of the magnesium-based cement is increased, meanwhile, the setting time of the magnesium-based cement is prolonged due to the low-temperature environment in the slurry hopper, and the 3D printing of the magnesium-based cement is facilitated; in addition, the dry ice added in the printing process introduces carbon dioxide into the 3D printed product, so that long-term carbonization inside the 3D printed product is facilitated, and the 3D printed magnesium-based cement has high compactness, macroscopic mechanical property and durability.
The special spray head for 3D printing of magnesium-based cement is beneficial to smoothly realizing 3D printing of magnesium-based cement, obviously improves the carbon fixing capacity in the 3D printing process of magnesium-based cement, improves the modern production process of magnesium-based cement products, contributes to reducing carbon emission in the building field and the whole society, and has very obvious technical advantages and economic and ecological benefits.
The magnesium-based cement concrete product is maintained by the temperature control carbonization chamber, the humidity control carbonization chamber and the storage maintenance chamber, so that the magnesium-based cement concrete product is effectively ensured to be at different carbon dioxide gas concentrations, carbon dioxide gas pressures, environmental temperatures and relative humidity in the hydration process of different magnesium-based cement 3D printed products, the low-temperature maintenance and the carbonization maintenance are effectively combined together, the microstructure in the magnesium-based cement is further improved, and the guarantee is provided for improving the compactness, the macroscopic mechanical property and the durability of the magnesium-based cement. The intelligent temperature and carbonization maintenance of the magnesium-based cement 3D printed product is very facilitated. The magnesium-based cement 3D printing and curing whole-process carbonization enhancement is realized through the magnesium-based cement 3D printing special nozzle and the magnesium-based cement concrete product curing system.
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 maintenance method of the magnesium-based cement concrete product is characterized by comprising the following steps of:
s101, setting a reference sample and a test sample for the concrete product;
s102, controlling temperature, carbonizing and maintaining, and adjusting the temperature of the sample according to the temperature of the reference sample; the concentration of carbon dioxide is 75-95% during the temperature control carbonization curing, and the pressure of carbon dioxide gas is 80-90 KPa; the temperature is lower than minus 60 ℃;
s103, carrying out humidity control carbonization curing on the concrete product cured in the step S102, wherein the relative humidity during the humidity control carbonization curing is 80-95%;
and S104, performing storage carbonization curing on the concrete product cured in the step S103, wherein the concentration of carbon dioxide is 80-95%, the temperature is 20-35 ℃, and the relative humidity is 80-96%.
2. The method for curing the magnesium-based cement concrete product as recited in claim 1, wherein the wet-controlled carbonation curing is dry ice curing, and the temperature-controlled carbonation curing, storage carbonation curing is carbon dioxide gas curing;
the method comprises the following steps of preparing a reference sample, and pre-burying a temperature sensor in a concrete product before final setting; cutting the concrete product, wherein a reference sample with a temperature sensor is used as a reference sample, and a sample without the temperature sensor is used as a sample;
the temperature control carbonization maintenance is carried out by connecting a temperature sensor of the reference sample with a temperature controller, and the temperature controller adjusts the temperature of the sample according to the temperature of the reference sample to carry out temperature control carbonization maintenance;
and when the surface temperature of the reference sample and the sample is reduced to the room temperature again, carrying out humidity-controlled carbonization maintenance on the reference sample and the sample.
3. A special system for maintaining the magnesium-based cement concrete product as claimed in claims 1-2, wherein the special system comprises a temperature-controlled carbonization chamber, a humidity-controlled carbonization chamber, a storage carbonization chamber;
the temperature control carbonization chamber and the storage carbonization chamber are both provided with carbon dioxide devices, and the humidity control carbonization chamber is provided with a dry ice device.
4. The system special for maintaining the magnesium-based cement concrete product as claimed in claim 3, wherein the temperature-controlled carbonization chamber comprises a temperature controller, a temperature-reducing device and a temperature-raising device;
the temperature control carbonization chamber is provided with a reference sample placing table and a sample table; the temperature reducing device and the temperature raising device are positioned at the periphery of the sample table, the temperature controller is connected with the sample table through a temperature sensor, and the temperature reducing device and the temperature raising device are electrically connected with the temperature controller; placing dry ice around the concrete product, and adjusting the concentration and temperature of carbon dioxide in the temperature-controlled carbonization chamber according to the amount of the dry ice;
the humidity control carbonization chamber comprises a sample chamber, a dry ice storage chamber, a dry ice regulator and a relative humidity regulator; the sample chamber is connected with the dry ice storage chamber through a temperature sensor and a dry ice regulator; the sample chamber is connected with a relative humidity regulating instrument through a relative humidity sensor;
the storage curing room is provided with a temperature and humidity control instrument;
the carbon dioxide device comprises a carbon dioxide gas regulator, a carbon dioxide gas bottle and a carbon dioxide gas concentration sensor, and the carbon dioxide gas regulator is connected with the carbon dioxide gas bottle and the carbon dioxide gas concentration sensor.
5. The system of claim 3, wherein the system comprises an identification system, the identification system comprises an identification device, an infrared volume measuring device, a quality measuring device, and a classification screening machine.
6. The system as claimed in claim 3, wherein said system comprises a 3D printer;
3D printer is equipped with magnesium base cement special use and prints the shower nozzle, the shower nozzle includes: a hopper and a dry ice hopper; the dry ice hopper is connected with the hopper, a stirrer is arranged in the hopper, and the bottom of the hopper is connected with a nozzle;
and a dry ice controller is arranged between the dry ice hopper and the hopper.
7. The system special for maintaining the magnesium-based cement concrete product as claimed in claim 6, wherein the stirrer comprises a support rod and a spiral blade, the support rod is fixed at the bottom of the hopper, and the spiral blade is spirally fixed on the support rod;
the spiral sheet is provided with at least one stirring blade;
when the stirring leaf is a plurality of, the stirring leaf tip that is close to the motor setting is upwards inclined, the stirring leaf is close to the nozzle setting, stirring leaf tip downward sloping.
8. The system as claimed in claim 7, wherein the mixing blade is a folded blade shape protruding outward.
9. The special system for maintaining the magnesium-based cement concrete product as claimed in claim 6, wherein an exhaust device is arranged at the middle lower part of the hopper, the exhaust device comprises an exhaust hole and an exhaust groove, and the exhaust groove is arranged at the lower part of the exhaust hole;
the exhaust hole is a filter screen, and the exhaust groove is annularly arranged with the hopper.
10. The system of claim 3, wherein the components of the system are connected by a transmission device.
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| CN202110575370.8A CN113500687B (en) | 2021-05-26 | 2021-05-26 | Method for curing magnesium-based cement concrete product and special system |
| NL2031562A NL2031562B1 (en) | 2021-05-26 | 2022-04-12 | Curing method for magnesium-based cement concrete products and dedicated system thereof |
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| CN202110575370.8A CN113500687B (en) | 2021-05-26 | 2021-05-26 | Method for curing magnesium-based cement concrete product and special system |
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| US4427610A (en) * | 1982-01-06 | 1984-01-24 | Conger/Murray Systems, Inc. | Method and apparatus for curing concrete products |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN113500687A (en) | 2021-10-15 |
| NL2031562B1 (en) | 2023-04-04 |
| NL2031562A (en) | 2022-12-08 |
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