CN114702287A - Printing material and preparation method and application thereof - Google Patents
Printing material and preparation method and application thereof Download PDFInfo
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- CN114702287A CN114702287A CN202210411376.6A CN202210411376A CN114702287A CN 114702287 A CN114702287 A CN 114702287A CN 202210411376 A CN202210411376 A CN 202210411376A CN 114702287 A CN114702287 A CN 114702287A
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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
- C04B28/06—Aluminous cements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
- B33Y70/10—Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/05—Materials having an early high strength, e.g. allowing fast demoulding or formless casting
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
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- Manufacturing & Machinery (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
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Abstract
The invention belongs to the technical field of building 3D printing materials, and discloses a printing material and a preparation method and application thereof. The printing material comprises the following components in parts by mass: 100 parts of rapid hardening sulphoaluminate cement (SAC), 23-27 parts of fly ash, 8-12 parts of silica fume, 130-180 parts of quartz sand, 30-50 parts of mixing water, 0.4-0.6 part of polycarboxylic acid water reducing agent, 0.08-0.12 part of thickening agent HPMC, 0.8-1.2 parts of thixotropic agent attapulgite and 0.05-0.1 part of coagulant lithium carbonate, so that a retarder is omitted, the cost can be greatly reduced, and the economic benefit is improved; the initial setting time is controllable within 3-5 minutes, and compared with the setting time of 40-100 minutes of the existing printing material, the initial setting time is shortened greatly; the printer can print 5kg of dry materials within 1 minute, the printing component can be quickly condensed and has strength and printing efficiency, the 3D printing and quick construction advantages are fully exerted, the construction period is shortened, the cost is reduced, and the printer is applied to the 3D printing of buildings in engineering environments needing quick construction, such as municipal emergency, building repair and reinforcement, and in special environments, such as severe cold areas, underwater and the like.
Description
Technical Field
The invention relates to the technical field of building 3D printing materials, in particular to a printing material and a preparation method and application thereof.
Background
The building 3D printing technology has the remarkable advantages of high intelligent degree, high building speed, labor force demand reduction, cost saving and the like, has huge application potential, and gradually becomes a research hotspot which rapidly rises all over the world. The 3D printing cement-based material needs to control key performance indexes such as flowability, extrudability, constructability, setting time and strength in the preparation process, wherein the setting time and the strength serve as two main performance indexes, and the method has important influence on the exertion of the advantage of rapid construction of 3D printing. The existing printing equipment is mostly composed of a storage system, a pumping system, a discharging system and a printing system, stirred concrete slurry needs to be loaded into a storage bin, the concrete is transported to a printing head through the pumping system, and finally the printing head extrudes printing materials to realize 3D printing. Therefore, the printing material often needs to be added with a retarder during the preparation process to prolong the setting time of the printing material so as to ensure smooth extrusion.
After research on related fields at home and abroad, the existing printing material is found to have the setting time generally about 40-70 min or longer, for example, a cement-based material with the setting time of 45min is obtained by mixing 60% of calcium sulphoaluminate and 40% of common Portland cement by the professor Zareiyan of the university of California of the United states, and the 28d compressive strength is 26.2 MPa; professor Sanjayan of Australian Si Wei Ben Ke technical university utilizes ordinary portland cement to develop a cement-based material, and the initial setting time and the final setting time of the cement-based material are 142/284min respectively; the Khalil professor of the university of Ricel, France uses 93 percent of ordinary portland cement and 7 percent of calcium sulphoaluminate cement to prepare 3D printing mortar, the initial setting time and the final setting time of the 3D printing mortar are 110/150min respectively, and the compressive strength of a printing sample and a pouring sample 28D is 79MPa and 88MPa respectively; chinese building Co., Ltd develops a printing material which takes sulphoaluminate cement and slag powder as main substrates, and necessary chemical additives such as a water reducing agent, a composite volume stabilizer and the like are added, so that the setting time of the printing material can be realized within 20-60 min; the Jinxi of the Jinnan university adds 0.5 percent of nano silicon dioxide in a white cement-based material, and is supplemented with additives such as a water reducing agent, a thickening agent and the like to prepare 3D printing mortar, wherein the setting time is 114-182 min, and the 3D compressive strength is 46.9 MPa; professor Wanghai dragon of Zhejiang university develops 3D printing high-performance PVA fiber concrete, and adds retarder and other additives to control the setting time of the printing material within 20-80 min.
In the existing printing system, the printing material enters the printing system in a flowing state after being stirred by adding water, and in a severe cold area, the cement-based printing material cannot be normally hydrated and condensed because the hydration temperature required by cement cannot be reached, so that the 3D printing of a component cannot be realized; in the underwater environment, cement-based printing materials are long in setting time and cannot be rapidly molded, and components collapse due to impact of water flow, so that 3D printing cannot be achieved. These are all problems to be solved by the existing conventional architectural 3D printing technology.
In addition, the existing 3D printing technology requires pipeline transportation for stirring and extruding cement-based materials in printing equipment, requires the used printing materials to have longer setting time, and needs to add additives such as retarders in the materials, which not only increases the cost and reduces the performance of the product, but also cannot realize 3D printing in special environments such as cold and underwater.
Disclosure of Invention
In order to solve the technical problems mentioned in the background art, the retarder is removed from the prepared rapid-setting 3D printing cement-based material, the setting time is controlled to be 3-5 min, the 3D printing performance requirement is met, and particularly, rapid printing is realized by combining a 3D printing device which is independently researched and developed by the inventor and simultaneously used for stirring and extruding materials, so that the printed member can be rapidly set and hardened and has strength, the working efficiency can be greatly improved while the material cost is saved and the product performance is improved, and the rapid construction advantage of 3D printing is fully exerted. Because the material enters the printing system in a dry powder state, the building 3D printing application in special environments such as cold and underwater can be realized.
The technical scheme adopted by the invention is as follows:
a printing material comprises the following components in parts by mass: 100 parts of rapid hardening sulphoaluminate cement SAC, 23-27 parts of fly ash, 8-12 parts of silica fume, 130-180 parts of quartz sand, 30-50 parts of mixing water, 0.4-0.6 part of polycarboxylic acid water reducing agent, 0.08-0.12 part of thickening agent HPMC, 0.8-1.2 parts of thixotropic agent attapulgite and 0.05-0.1 part of coagulant lithium carbonate.
Preferably, the composition comprises the following components in parts by mass: 100 parts of rapid hardening sulphoaluminate cement SAC, 25 parts of fly ash, 10 parts of silica fume, 150 parts of quartz sand, 40 parts of mixing water, 0.5 part of polycarboxylic acid water reducing agent, 0.1 part of thickening agent hydroxypropyl methyl cellulose, 1 part of thixotropic agent attapulgite and 0.06 part of coagulant lithium carbonate.
Further, the fly ash is I-grade fly ash with the fineness of 11.6 percent and the residue of a square-hole sieve of 45 mu m. The polycarboxylate superplasticizer is selected from light yellow powder of Tianjin Weihe scientific and technological development Limited company with the specification model of WH-A (standard type).
The main chemical components of the cementing material consisting of the rapid hardening sulphoaluminate cement SAC, the fly ash and the silica fume are shown in the table 1, and the cement performance index is shown in the table 2.
TABLE 1 chemical composition of the Binder
TABLE 2SAC Cement Performance index
Furthermore, the quartz sand with three different meshes of 20-40 meshes, 40-70 meshes and 70-120 meshes is selected and mixed according to the mass mixing ratio of 180:165:255 for use as the aggregate of the invention, and the main indexes of the aggregate are shown in Table 3.
TABLE 3 Main physical Properties of aggregates
A method of preparing a printing material, comprising the steps of:
(1) weighing: respectively weighing 400g of SAC cement, 520-720 g of quartz sand, 92-108 g of fly ash, 32-48 g of silica fume, 1.6-2.4 g of polycarboxylic acid high-performance water reducing agent, 0.32-0.48 g of HPMC (hydroxy propyl methyl cellulose) thickener, 3.2-4.8 g of thixotropic agent and 0.2-0.4 g of coagulant, and adding the materials into a stirring pot of a JJ-5 type cement mortar stirrer at one time;
(2) stirring: stirring the dry powder with a stirring speed of 62 +/-5 r/min by adopting manual control, starting a stirrer, stirring for 2-3min to uniformly mix the dry powder material, and then pouring the stirred dry powder into a plastic barrel for storage;
(3) printing: the method comprises the steps of printing by adopting a 3D printing device which simultaneously stirs and extrudes materials, inputting a target model code in a CNC (computer numerical control) system of a printer during printing, filling a water tank of the printer with water, ensuring that a water supply system has sufficient water during printing, adjusting a flow meter to control water flow per minute to be 150mL, filling printing materials stored in a plastic barrel in the step (2) into a storage bin of the 3D printing device which simultaneously stirs and extrudes the materials until 2/3 of the volume of the storage bin, starting the printer after all preparation work is done, clicking a starting button of a control screen of the printer, and automatically printing by the printer until printing of a target model is completed. The amount of the dry powder in the storage bin is observed in the printing process, and timely supplement is needed if the amount of the dry powder is not enough, so that printing interruption is avoided. After printing, pull down and beat printer head and wash the inside residual slurry of stirring chamber, make things convenient for next use.
The application of the printing material is used for 3D printing of buildings, the fields of buildings and decoration, municipal emergency repair engineering and the like in severe cold areas, underwater and other special environments.
Furthermore, the material is used as a special matched printing material for a 3D printing device which is independently researched and developed by the inventor and is used for simultaneously stirring and extruding materials.
Compared with the prior art, the invention has the beneficial effects that:
the material stirring and extruding device can be used as a special matched printing material for a 3D printing device which is independently researched and developed by an inventor and is used for simultaneously stirring and extruding materials. As shown in fig. 1, a 3D printing head device in which material stirring and extrusion are simultaneously performed, which is a core component in the printing device, is applied to the following applications: 201811559067.3, granted by the invention patent, has the main technical characteristics that dry powder can be adopted to enter the device to be mixed with liquid and then extruded, thereby greatly reducing or removing the consumption of retarder in the traditional 3D printing concrete, being beneficial to improving various performance indexes of printing components, and having unique advantages for printing quick-setting cement-based materials with the setting time of less than 5 min.
According to the 3D printing quick-setting cement-based material, quick-hardening sulphoaluminate cement is used as a main cementing material, and a water reducing agent, a thixotropic agent, a thickening agent and the like are used as auxiliary materials, so that the setting time can be controlled within 3-5 min, the fluidity is 170-182 mm, and the fluidity requirement is met; continuously printing a long test piece of 9 round-trip paths each having a length of 800mm and a total length of 7200mm as shown in FIG. 2(a) without interruption to evaluate the extrudability of the printed material. As shown in fig. 2(b), the phenomena of cement strip breakage, print head blockage and the like do not occur in the printing process, indicating that the extrusion performance is good; the constructivity test was carried out by printing a hollow circular ring having a height of 300mm and a diameter of 300mm as shown in FIG. 3 (a). FIG. 3(b) is a printed solid component, which has a measured total height of 296mm and a theoretical height of 98.67%, and the change rate of the printed component in the total height direction is 1.33%, the diameter of the upper opening and the diameter of the lower opening are not changed basically, and the component is not inclined or collapsed, which indicates that the building performance is good and the printing requirement is satisfied; the printed sample has high early and later strength, the compression strength and the bending strength of 7 days are 32.8MPa and 9.11MPa, the compression strength and the bending strength of 28 days are 42.3MPa and 10.25MPa, and the engineering application can be met.
Compared with the conventional cement-based printing material, the product of the invention omits a retarder in the ingredients, can greatly reduce the cost and improve the economic benefit; the initial setting time can be controlled within 3-5 minutes, and compared with the setting time of 40-100 minutes of the existing printing material, the initial setting time is shortened greatly; the printer can print 5kg of dry materials within 1 minute, and the printing component can be quickly condensed and has strength, so that the printing efficiency is higher, the 3D printing quick construction advantage can be fully exerted, the construction period is shortened, the cost is reduced, and the printing component is applied to the engineering environment needing quick construction, such as municipal emergency, building repair and reinforcement and the like; the printing material enters the printing system in a dry powder state, is instantly mixed with water in the printing head, is stirred and extruded, has large hydration heat release and strong water requirement, can be quickly molded within 5 minutes after being extruded, and can be used for building 3D printing in severe cold areas, underwater and other special environments by being matched with a constant temperature maintaining system in the printing head.
Drawings
Fig. 1 is a 3D printing nozzle device with an authorization notice number of 109366999B, in which material stirring and extrusion are performed simultaneously, (a) is a schematic diagram of a 3D printing nozzle, and (B) is a structural diagram of the 3D printing nozzle;
FIG. 2 is a diagram showing the extrudability test of the present invention, (a) is a schematic diagram showing the extrudability test, and (b) is a diagram showing an object of the extrudability test;
FIG. 3 is a construction test chart of the present invention, (a) a schematic view of a construction test, (b) a physical view of a construction test;
FIG. 4 is a drawing of a JJ-5 cement mortar mixer;
FIG. 5 is a drawing of a stir-extrusion integrated concrete 3D printer;
FIG. 6 is a printing view of a circular member, (a) is a process diagram, and (b) is a solid view of the circular member;
FIG. 7 is a diagram of a printed solid component of the fiber quick setting cementitious material of the present invention;
FIG. 8 is a diagram of a printed physical component of a material having a fiber volume loading of 0% in accordance with the present invention;
FIG. 9 is a diagram of a printed physical component of a material having a fiber volume loading of 0.5% in accordance with the present invention;
FIG. 10 is a diagram of a printed physical component of a material having a fiber volume loading of 1.0% in accordance with the present invention;
FIG. 11 is a diagram of a printed physical component of a material having a fiber volume loading of 1.5% in accordance with the present invention;
fig. 12 is a diagram of a prior art conventional cement-based material printed solid component.
The specific implementation mode is as follows:
the technical solution of the present invention will be described in further detail with reference to examples. The description is intended to be illustrative of the features and advantages of the invention, and should not be taken to limit the scope of the invention. Unless otherwise specified, the experimental methods adopted by the invention are all conventional methods, and experimental equipment, materials, reagents and the like used in the experimental method can be obtained from commercial sources.
The SAC is prepared from 42.5 composite rapid-hardening sulphoaluminate cement from Hebei Tangshan polar bears; the I-grade fly ash is produced by the cabbage leaf containing environment-friendly building materials Co.Ltd; the silica fume is produced by Sanyuan silicon materials, Inc.; the quartz sand is from Xinlian quartz sand ore in Zhuang river city; the water reducing rate of the polycarboxylate superplasticizer is more than 30 percent; the thickener hydroxypropyl methylcellulose has a viscosity of 10 ten thousand.
Example 1
(1) Weighing: 400g of SAC cement, 600g of quartz sand, 100g of fly ash, 40g of silica fume, 2.0g of polycarboxylic acid high-performance water reducing agent, 0.4g of HPMC thickening agent, 4g of thixotropic agent and 0.24g of coagulant which are dry powder materials required by the test are respectively weighed and added into a stirring pot of a JJ-5 type cement mortar stirrer shown in figure 4 at one time.
(2) Stirring: manually stirring at low speed of 62 + -5 r/min, controlling stirring time with stopwatch, stirring the dry powder, starting the stirrer, stirring for 2-3min to mix the dry powder material uniformly, stopping stirring, and slowly pouring the stirred dry powder into plastic bucket for storage.
(3) Printing: printing is performed by using a 3D printing device which is simultaneously stirred and extruded by materials and invented by the inventor as shown in FIG. 5. When printing, firstly, inputting a target model code in a computer numerical control system (CNC) of a printer, secondly, filling a water tank of the printer with water, ensuring that a water supply system has sufficient water sources during printing, adjusting a flow meter to control the flow rate of water per minute to be 150mL, then filling a printing material stored in a plastic barrel into a bin of the stirring-extruding integrated concrete 3D printer until 2/3 of the volume of the bin, starting the printer after all preparation work is done, clicking a starting button (green button) of a control screen of the printer, and automatically printing by the printer until the printing of the target model is finished. The amount of the dry powder in the storage bin is observed in the printing process, and timely supplement is needed if the amount of the dry powder is not enough, so that printing interruption is avoided. After printing, pull down and beat printer head and wash the inside residual slurry of stirring chamber, make things convenient for next use.
Example 2
The printing material dry powder is prepared by the following mixing ratio: 100 parts of rapid hardening sulphoaluminate cement SAC, 25 parts of fly ash, 10 parts of silica fume, 150 parts of quartz sand, 40 parts of mixing water, 0.5 part of polycarboxylic acid water reducing agent, 0.1 part of thickening agent hydroxypropyl methyl cellulose, 1 part of thixotropic agent attapulgite and 0.06 part of coagulant lithium carbonate. The printing of the hollow circles was performed for one hour continuously on the autonomously developed printer shown in fig. 5, and the printing results are shown in fig. 6. The printing process is continuous and complete, and the phenomena of printing interruption, blockage and the like do not occur. The printed component has no phenomena of inclined collapse and the like, the surface has corrugated textures, the interior of the component is smooth, and the printing effect is good.
Example 3
The series of materials has the fluidity of 174mm after being tested; final setting time at 22 ℃ under 60% humidity is <5 min; the compressive strength of the pouring samples 3d and 28d are respectively as follows: 45.7MPa and 56.6 MPa; the breaking strength is respectively as follows: 6.65MPa and 7.39 MPa.
Example 4
On the basis of the mixing ratio of the embodiment 2, the chopped basalt fibers with different volume mixing amounts of 0.5 percent, 1.0 percent and 1.5 percent are respectively added to prepare the quick-setting fiber cement-based printing material dry powder, and the material mixing ratio is shown in table 4. Printing of rectangular members having dimensions of 800mm × 200mm × 48mm is accomplished on a self-developed printer as shown in fig. 5, and the printing process is as shown in fig. 8-11, as shown in fig. 7. The whole printing process is continuous, the phenomena of printing blockage and fracture do not occur, when the volume content of the fiber is increased to 1.5%, a few tiny cracks appear on the surface of the component, and the whole printing effect is good.
TABLE 4 mixing proportion of 3D printing cement-based material under different basalt fiber mixing amount
Note: all numerical values are the ratio of the mass of the SAC cement; b represents basalt fiber; the length of the B6 basalt fiber is 6 mm; b6-0.5 represents the 0.5 volume percent of basalt fiber doped with 6 mm.
Comparative example 1
To further verify that the product of the invention is a special matching material for a rapid-hardening concrete 3D printer, a conventional 3D printing cement-based material with a setting time of about 30-53min is adopted, the material matching ratio is shown in Table 5, a circular ring member with a diameter of 200mm is printed on a self-developed printer shown in FIG. 5 for testing, and the printing result is shown in FIG. 12. It can be seen that the printing process is accompanied by severe bleeding, the printing strip is discontinuous, the printing strip is broken, the printing component collapses, and the printing of the whole component cannot be completed.
The implementation case further proves that the material can be a special printing material for a matched 3D printer, can ensure that the printing of related products and components is finished, and has a good printing effect.
TABLE 53D printing Material mix ratios
Note: all values are ratios to the mass of SAC cement.
The embodiments of the present invention are not limited to the above-described embodiments, and various changes, modifications, substitutions and alterations in form and detail may be made by those skilled in the art without departing from the spirit and scope of the invention, and these are considered to fall within the scope of the invention.
Claims (7)
1. A printing material is characterized by comprising the following components in parts by mass: 100 parts of rapid hardening sulphoaluminate cement SAC, 23-27 parts of fly ash, 8-12 parts of silica fume, 130-180 parts of quartz sand, 30-50 parts of mixing water, 0.4-0.6 part of polycarboxylic acid water reducing agent, 0.08-0.12 part of thickening agent HPMC, 0.8-1.2 parts of thixotropic agent attapulgite and 0.05-0.1 part of coagulant lithium carbonate.
2. The printing material according to claim 1, wherein the printing material comprises the following components in parts by mass: 100 parts of rapid hardening sulphoaluminate cement SAC, 25 parts of fly ash, 10 parts of silica fume, 150 parts of quartz sand, 40 parts of mixing water, 0.5 part of polycarboxylic acid water reducing agent, 0.1 part of thickening agent hydroxypropyl methyl cellulose, 1 part of thixotropic agent attapulgite and 0.06 part of coagulant lithium carbonate.
3. The marking material according to claim 1, wherein said fly ash is class i fly ash having a fineness of 11.6% and a 45 μm square mesh sieve residue.
4. The printing material of claim 1, wherein the quartz sand is selected from 20-40 mesh, 40-70 mesh and 70-120 mesh quartz sand, and is mixed according to a mass mixing ratio of 180:165: 255.
5. A preparation method of a printing material is characterized by comprising the following steps:
(1) weighing: respectively weighing 400g of SAC cement, 520-720 g of quartz sand, 92-108 g of fly ash, 32-48 g of silica fume, 1.6-2.4 g of polycarboxylic acid high-performance water reducing agent, 0.32-0.48 g of HPMC (hydroxy propyl methyl cellulose) thickener, 3.2-4.8 g of thixotropic agent and 0.2-0.4 g of coagulant, and adding the materials into a stirring pot of a JJ-5 type cement mortar stirrer at one time;
(2) stirring: stirring the dry powder with a stirring speed of 62 +/-5 r/min by adopting manual control, starting a stirrer, stirring for 2-3min to uniformly mix the dry powder material, and then pouring the stirred dry powder into a plastic barrel for storage;
(3) printing: the method comprises the steps of printing by adopting a 3D printing device which simultaneously performs material stirring and extrusion, firstly inputting a target model code in a computer numerical control system (CNC) of a printer during printing, secondly filling a water tank of the printer with water and adjusting a flow meter to control water flow per minute to be 150mL, then filling a printing material stored in a plastic barrel in the step (2) into a storage bin of the 3D printing device which simultaneously performs material stirring and extrusion, starting the printer until 2/3 of the volume of the storage bin, clicking a starting button of a control screen of the printer, and automatically printing by the printer until the printing of the target model is completed.
6. The application of the printing material is characterized by being used for 3D printing of buildings in severe cold areas and underwater, the fields of buildings and decoration and municipal emergency repair engineering.
7. The application of the printing material is characterized in that the printing material is used as a special matched printing material of a 3D printing device for simultaneously stirring and extruding materials.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116003076A (en) * | 2023-01-30 | 2023-04-25 | 大连工业大学 | 3D printed concrete shell powder modified quick-setting composite concrete material |
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