CN114633360A - Preparation method of special-shaped light-transmitting concrete based on concrete 3D printing - Google Patents
Preparation method of special-shaped light-transmitting concrete based on concrete 3D printing Download PDFInfo
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- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical group C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 5
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Classifications
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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
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/0037—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects with elements being able to conduct light, e.g. light conducting fibers
-
- 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
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/001—Rapid manufacturing of 3D objects by additive depositing, agglomerating or laminating of material
-
- 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
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/04—Producing shaped prefabricated articles from the material by tamping or ramming
- B28B1/045—Producing shaped prefabricated articles from the material by tamping or ramming combined with vibrating or jolting
-
- 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
-
- 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
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
-
- 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
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
- B28B7/346—Manufacture of moulds
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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
- B28C5/40—Mixing specially adapted for preparing mixtures containing fibres
- B28C5/402—Methods
-
- 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
- B33Y10/00—Processes of additive manufacturing
-
- 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
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
- B33Y40/10—Pre-treatment
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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
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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
-
- 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
- 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
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
-
- 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
- C04B2111/80—Optical properties, e.g. transparency or reflexibility
- C04B2111/805—Transparent material
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Producing Shaped Articles From Materials (AREA)
Abstract
The invention discloses a preparation method of special-shaped light-transmitting concrete based on concrete 3D printing, which has the technical scheme that: the method comprises the following steps: s1, selecting materials: selecting the following components by mass for later use, 160-180 parts of water, 350-370 parts of portland cement, 10-15 parts of sulphoaluminate cement, 60-70 parts of silica fume, 4-8 parts of short fiber, 2-4 parts of polycarboxylic acid water reducing agent, 4-8 parts of expanding agent, 10-20 parts of cellulose and 1300-1400 parts of medium sand; s2, feeding; s3, laying light guide materials: arranging a light guide material on the bottom template according to a design pattern; s4, 3D printing; s5, modifying: cutting off redundant light guide materials in the formed concrete block; s6, maintenance: and (5) building a greenhouse. The preparation method of the special-shaped light-transmitting concrete based on the concrete 3D printing has the advantages of simple process and capability of manufacturing the special-shaped light-transmitting concrete, and the formed special-shaped concrete has better quality; the preparation process of the special-shaped light-transmitting concrete block is simplified, and the production cost is reduced.
Description
Technical Field
The invention relates to the field of concrete production, in particular to a preparation method of special-shaped light-transmitting concrete based on concrete 3D printing.
Background
The transparent concrete is also called transparent cement, is a product made of cement, aggregate, stones and sand, and the most common product is a transparent concrete floor tile.
The prior chinese patent publication No. CN104827565B discloses a preparation process of light-transmitting concrete based on optical fiber coating. The method comprises the following steps: passing the straightened optical fiber through the cement paste to enable the paste to be adhered to the surface of the optical fiber; the optical fiber adhered with the cement paste passes through the shaping cylinder to scrape off the redundant paste; after the cement slurry wrapped on the surface of the optical fiber is hardened, cutting the optical fiber into optical fiber core strips with equal length; aligning two ends of the optical fiber core strip, and tightly arranging the two ends of the optical fiber core strip together in a bundling or stacking mode in a mould; injecting cement paste into gaps among the optical fiber core strips; after the cement paste is hardened, grinding the two ends of the concrete along the arrangement direction of the optical fibers, and exposing the ends of the optical fibers to obtain the light-transmitting concrete
The preparation process of the light-transmitting concrete based on the optical fiber coating paste has some disadvantages, such as: the special-shaped light-transmitting concrete cannot be produced, the production process is complex, and the molding quality is poor.
Disclosure of Invention
Aiming at the problems mentioned in the background art, the invention aims to provide a preparation method of special-shaped light-transmitting concrete based on concrete 3D printing, so as to solve the problems mentioned in the background art.
The technical purpose of the invention is realized by the following technical scheme:
a preparation method of special-shaped light-transmitting concrete based on concrete 3D printing comprises the following steps:
s1, selecting materials: selecting the following components by mass for later use, 160-180 parts of water, 350-370 parts of portland cement, 10-15 parts of sulphoaluminate cement, 60-70 parts of silica fume, 4-8 parts of short fiber, 2-4 parts of polycarboxylic acid water reducing agent, 4-8 parts of expanding agent, 10-20 parts of cellulose and 1300-1400 parts of medium sand;
s2, feeding: adding water, ordinary portland cement, sulphoaluminate cement, silica fume, short fibers, a polycarboxylic acid water reducing agent, an expanding agent, cellulose and medium sand into a concrete mixer, uniformly mixing the materials by using the concrete mixer, and then conveying the mixed raw materials into a charging barrel in a 3D printer by using a screw type pulp shooting machine;
s3, laying light guide materials: arranging a light guide material on a bottom template according to a design pattern, and placing the template on a printing platform;
s4, 3D printing: starting a 3D printer, forming a shell and an internal connection on a template by using a 3D printer nozzle according to design, arranging reinforced connection screw-thread steel inside the shell, pouring self-compacting mortar inside the formed shell, covering the screw-thread steel and a light guide material, and vibrating;
s5, modifying: cutting off redundant light guide materials in the formed concrete block;
s6, maintenance: and (4) building a greenhouse, and moving the formed concrete blocks to be maintained by using the printing platform.
Preferably, when the S1 is selected, 170 parts of water, 364.5 parts of Portland cement, 13.5 parts of sulphoaluminate cement, 65.25 parts of silica fume, 6.75 parts of short fibers, 2.9 parts of a polycarboxylic acid water reducing agent, 6.3 parts of an expanding agent, 10 parts of cellulose and 1350 parts of medium sand are selected for standby.
Preferably, in the feeding step of S2, the mixed raw material is conveyed into a barrel of the 3D printer by using a screw-type shotcrete machine, and the splashed material is conveyed into the screw-type shotcrete machine by using a circulating pump.
Preferably, in the step S3, when the light guide material is laid, the light guide material is laid according to a design pattern, and a plastic optical fiber is used as the light guide material.
Preferably, when the S1 is selected, 5-10 parts of a thickening rheological agent is also selected, and the thickening rheological agent is a sodium cellulose salt thickening rheological agent.
Preferably, when the S1 is selected, the particle size of the silica fume is 0.1-0.3 mm.
Preferably, after the curing in S6, an inspection step S7 is performed, and the inspection step S7 includes: whether the concrete block has cracks or not is detected, and meanwhile, the compactness of the concrete block is detected.
Preferably, when the material is selected by the S1, the material also comprises 30-40 parts of steel fiber.
In summary, the invention mainly has the following beneficial effects:
the preparation method of the special-shaped light-transmitting concrete based on the concrete 3D printing has the advantages of simple process and capability of manufacturing the special-shaped light-transmitting concrete, and the formed special-shaped concrete has better quality; through adopting steps such as selecting materials, pay-off, laying leaded light material, 3D prints, trimming, maintenance, utilizes concrete 3D to print the building block forming die of technique preparation integral structure, and 3D prints preparation dysmorphism concrete block mould, and the size is accurate, has solved the problem of dysmorphism building block forming die preparation difficulty, has simplified the preparation technology of dysmorphism printing opacity concrete block, has reduced manufacturing cost. The cross section of the building block in the light transmission direction can be in various shapes, the limitation of a die in the traditional method is broken through, and diversification and individuation are realized; the matrix adopts self-compacting mortar with high fluidity and good cohesiveness, and the formulation scheme of make internal disorder or usurp suitable for light-transmitting concrete is researched by starting from two aspects of adjusting the mixing proportion of the mortar and adding the additive. The good crack resistance of the concrete is ensured, so that the prepared light-transmitting concrete product has good apparent effect.
Drawings
FIG. 1 is a block flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, a preparation method of special-shaped light-transmitting concrete based on concrete 3D printing includes the following steps:
s1, selecting materials: selecting the following components by mass for later use, 160 parts of water, 350 parts of portland cement, 15 parts of sulphoaluminate cement, 60 parts of silica fume, 4 parts of short fibers, 4 parts of a polycarboxylic acid water reducing agent, 4 parts of an expanding agent and 1300 parts of medium sand;
s2, feeding: adding water, ordinary portland cement, sulphoaluminate cement, silica fume, short fibers, a polycarboxylate water reducer, an expanding agent, cellulose and medium sand into a concrete mixer, uniformly mixing the materials by using the concrete mixer, and then conveying the mixed raw materials into a charging barrel in a 3D printer by using a screw type pulp shooting machine;
s3, laying light guide materials: arranging a light guide material on a bottom template according to a design pattern, and placing the template on a printing platform;
s4, 3D printing: starting a 3D printer, forming a shell and an internal connection on a template by using a 3D printer nozzle according to design, arranging reinforced connection screw-thread steel inside the shell, pouring self-compacting mortar inside the formed shell, covering the screw-thread steel and a light guide material, and vibrating;
s5, modifying: cutting off redundant light guide materials in the formed concrete block;
s6, maintenance: and (4) building a greenhouse, and moving the formed concrete blocks to be maintained by using the printing platform.
When feeding, the S2 conveys the mixed raw materials into a charging barrel of the 3D printer by using the screw type pulp shooting machine, and conveys the splashed materials into the screw type pulp shooting machine by using the circulating pump in a circulating manner.
And S3, when the light guide material is laid, the light guide material is laid according to the design pattern, and the plastic optical fiber is used as the light guide material.
And when the S1 is selected, 5 parts of a thickening rheological agent is also selected, wherein the thickening rheological agent is a sodium cellulose salt thickening rheological agent.
Wherein, when the S1 is selected, the particle size of the silica fume is 0.1 mm.
Wherein, after the curing in S6, an S7 detection step is performed, and the S7 comprises: whether the concrete block has cracks or not is detected, and meanwhile, the compactness of the concrete block is detected.
And when the S1 is selected, 40 parts of steel fiber is also included.
The preparation method of the special-shaped light-transmitting concrete based on the concrete 3D printing has the advantages of simple process and capability of manufacturing the special-shaped light-transmitting concrete, and the formed special-shaped concrete has better quality; through adopting steps such as selecting materials, pay-off, laying leaded light material, 3D prints, trimming, maintenance, utilizes concrete 3D to print the building block forming die of technique preparation integral structure, and 3D prints preparation dysmorphism concrete block mould, and the size is accurate, has solved the problem of dysmorphism building block forming die preparation difficulty, has simplified the preparation technology of dysmorphism printing opacity concrete block, has reduced manufacturing cost. The cross section of the building block in the light transmission direction can be in various shapes, the limitation of a die in the traditional method is broken through, and diversification and individuation are realized; the matrix adopts self-compacting mortar with high fluidity and good cohesiveness, and the formulation scheme of make internal disorder or usurp suitable for light-transmitting concrete is researched by starting from two aspects of adjusting the mixing proportion of the mortar and adding the additive. The good crack resistance of the concrete is ensured, so that the prepared light-transmitting concrete product has a good appearance effect.
Example 2
Referring to fig. 1, a preparation method of special-shaped light-transmitting concrete based on concrete 3D printing includes the following steps:
s1, selecting materials: the production method comprises the following steps of selecting the following components, by mass, 170 parts of water, 370 parts of Portland cement, 10 parts of sulphoaluminate cement, 70 parts of silica fume, 8 parts of short fibers, 4 parts of a polycarboxylic acid water reducing agent, 8 parts of an expanding agent and 1350 parts of medium sand for later use;
s2, feeding: adding water, ordinary portland cement, sulphoaluminate cement, silica fume, short fibers, a polycarboxylic acid water reducing agent, an expanding agent, cellulose and medium sand into a concrete mixer, uniformly mixing the materials by using the concrete mixer, and then conveying the mixed raw materials into a charging barrel in a 3D printer by using a screw type pulp shooting machine;
s3, laying light guide materials: arranging a light guide material on a bottom template according to a design pattern, and placing the template on a printing platform;
s4, 3D printing: starting a 3D printer, forming a shell and an internal connection on a template by using a 3D printer nozzle according to design, arranging reinforced connection screw-thread steel inside the shell, pouring self-compacting mortar inside the formed shell, covering the screw-thread steel and a light guide material, and vibrating;
s5, modifying: cutting off redundant light guide materials in the formed concrete block;
s6, maintenance: and (4) building a greenhouse, and moving the formed concrete blocks to be maintained by using the printing platform.
When feeding, the S2 conveys the mixed raw materials into a charging barrel of the 3D printer by using the screw type pulp shooting machine, and conveys the splashed materials into the screw type pulp shooting machine by using the circulating pump in a circulating manner.
And S3, when the light guide material is laid, the light guide material is laid according to the design pattern, and the plastic optical fiber is used as the light guide material.
And 7 parts of a thickening rheological agent is also selected when the S1 is selected, wherein the thickening rheological agent is a sodium cellulose salt thickening rheological agent.
Wherein, when the S1 is selected, the particle size of the silica fume is 0.2 mm.
Wherein, after the curing in S6, an S7 detection step is performed, and the S7 comprises: whether the concrete block has cracks or not is detected, and meanwhile, the compactness of the concrete block is detected.
And when the S1 is selected, the material also comprises 36 parts of steel fibers.
The preparation method of the special-shaped light-transmitting concrete based on the concrete 3D printing has the advantages of simple process and capability of manufacturing the special-shaped light-transmitting concrete, and the formed special-shaped concrete has better quality; through adopting steps such as selecting materials, pay-off, laying leaded light material, 3D prints, trimming, maintenance, utilizes concrete 3D to print the building block forming die of technique preparation integral structure, and 3D prints preparation dysmorphism concrete block mould, and the size is accurate, has solved the problem of dysmorphism building block forming die preparation difficulty, has simplified the preparation technology of dysmorphism printing opacity concrete block, has reduced manufacturing cost. The cross section of the building block in the light transmission direction can be in various shapes, the limitation of a die in the traditional method is broken through, and diversification and individuation are realized; the matrix adopts self-compacting mortar with high fluidity and good cohesiveness, and the formulation scheme of make internal disorder or usurp suitable for light-transmitting concrete is researched by starting from two aspects of adjusting the mixing proportion of the mortar and adding the additive. The good crack resistance of the concrete is ensured, so that the prepared light-transmitting concrete product has good apparent effect.
Example 3
Referring to fig. 1, a preparation method of special-shaped light-transmitting concrete based on concrete 3D printing includes the following steps:
s1, selecting materials: the production method comprises the following steps of selecting the following components, by mass, 170 parts of water, 364.5 parts of Portland cement, 13.5 parts of sulphoaluminate cement, 65.25 parts of silica fume, 6.75 parts of short fibers, 2.9 parts of a polycarboxylic acid water reducing agent, 6.3 parts of an expanding agent, 10 parts of cellulose and 1350 parts of medium sand for later use;
s2, feeding: adding water, ordinary portland cement, sulphoaluminate cement, silica fume, short fibers, a polycarboxylic acid water reducing agent, an expanding agent, cellulose and medium sand into a concrete mixer, uniformly mixing the materials by using the concrete mixer, and then conveying the mixed raw materials into a charging barrel in a 3D printer by using a screw type pulp shooting machine;
s3, laying light guide materials: arranging a light guide material on a bottom template according to a design pattern, and placing the template on a printing platform;
s4, 3D printing: starting a 3D printer, forming a shell and an internal connection on a template by using a 3D printer nozzle according to design, arranging reinforced connection screw-thread steel inside the shell, pouring self-compacting mortar inside the formed shell, covering the screw-thread steel and a light guide material, and vibrating;
s5, modifying: cutting off redundant light guide materials in the formed concrete block;
s6, maintenance: and (4) building a greenhouse, and moving the formed concrete blocks to be maintained by using the printing platform.
When feeding, the S2 conveys the mixed raw materials into a charging barrel of the 3D printer by using the screw type pulp shooting machine, and conveys the splashed materials into the screw type pulp shooting machine by using the circulating pump in a circulating manner.
And S3, when the light guide material is laid, the light guide material is laid according to the design pattern, and the plastic optical fiber is used as the light guide material.
When the S1 is selected, 10 parts of a thickening rheological agent is also selected, and the thickening rheological agent is a sodium cellulose salt thickening rheological agent.
Wherein, when the S1 is selected, the particle size of the silica fume is 0.3 mm.
Wherein, after the curing in S6, an S7 detection step is performed, and the S7 comprises: whether the concrete block has cracks or not is detected, and meanwhile, the compactness of the concrete block is detected.
Wherein, when S1 is selected, 40 parts of steel fiber is also included.
The preparation method of the special-shaped light-transmitting concrete based on the concrete 3D printing has the advantages of simple process and capability of manufacturing the special-shaped light-transmitting concrete, and the formed special-shaped concrete has better quality; through adopting steps such as selecting materials, pay-off, laying leaded light material, 3D prints, trimming, maintenance, utilizes concrete 3D to print the building block forming die of technique preparation integral structure, and 3D prints preparation dysmorphism concrete block mould, and the size is accurate, has solved the problem of dysmorphism building block forming die preparation difficulty, has simplified the preparation technology of dysmorphism printing opacity concrete block, has reduced manufacturing cost. The cross section of the building block in the light transmission direction can be in various shapes, the limitation of a die in the traditional method is broken through, and diversification and individuation are realized; the matrix adopts self-compacting mortar with high fluidity and good cohesiveness, and the formulation scheme of make internal disorder or usurp suitable for light-transmitting concrete is researched by starting from two aspects of adjusting the mixing proportion of the mortar and adding the additive. The good crack resistance of the concrete is ensured, so that the prepared light-transmitting concrete product has good apparent effect.
In order to fully compare the preparation process of the light-transmitting concrete block with a comparison file, the invention carries out the following experiments and researches:
1. the light-transmitting concrete blocks were subjected to compression testing according to GB11968-2006 and the following table 1 was drawn.
TABLE 1
The building block has larger promotion compared with a comparison document comprehensively, wherein a compression resistance experiment method is adopted by adopting a press machine.
2. To ensure the smooth performance of experiment 1, the blocks tested according to examples 1, 2 and 3 first meet the following self-setting criteria:
3. the concrete samples obtained in examples 1 to 3 and comparative document 1 were subjected to an interfacial tensile bond strength test by the following method: in the test, a phi 45mm multiplied by 80mm cylindrical die is adopted, cement mortar is poured in the die, then light-transmitting spherical particles are placed on the cement mortar, a CMT series microcomputer control electronic universal (tensile) testing machine produced by Shanghai Xingsi measuring instrument manufacturing limited company is utilized to test 28-day tensile failure load of a tensile bonding strength test block, and interface bonding strength is calculated; the formula: t ═ F/a, where T is the tensile bond strength in MPa, F is the tensile force at tensile failure in KN, a is the cross-sectional area of the test piece in m, where the test piece is cylindrical with a diameter of 4.5 cm. After the test, the experimental results obtained are shown in table 3.
TABLE 3
| Tensile bond strength | |
| Example 1 | 4.8MPa |
| Example 2 | 5.1MPa |
| Example 3 | 4.9MPa |
| Comparison document | 4.4MPa |
4. Fire resistance test the concrete samples prepared in examples 1 to 3 and comparative document 1 were subjected to a fire resistance test and the data were normalized with reference to the comparative document, wherein the results after normalization are shown in the table below:
TABLE 4
| Fire resistance | |
| Example 1 | 125％ |
| Example 2 | 135％ |
| Example 3 | 128％ |
| Comparison document | 100％ |
5. Light transmission, the concrete samples from examples 1 to 3 and comparative document 1 were subjected to a fire resistance test and the data were normalized with reference to the comparative document, wherein the results after normalization are shown in the table below:
TABLE 4
The light-transmitting concrete prepared from the raw material components and by the preparation method is good in compressive strength, good in fire resistance and good in light transmission, the use safety of the light-transmitting concrete is improved, the interface bonding strength between a light-transmitting body and the concrete is high, the service life of the concrete is prolonged, and the light-transmitting effect is improved.
The fire resistance limit of the product prepared without adding the polycarboxylic acid water reducing agent and the expanding agent is obviously reduced, so that the fire resistance of the product can be obviously improved by adding the fire retardant. It can be seen from example 1, comparative example 2 and example 3 in combination with table 1/2/3/4 that the absence of the polycarboxylic acid water reducer and the swelling agent results in a significant decrease in the interfacial bond strength between the concrete and the light-transmitting spherical particles, and therefore it can be seen that the cured binder formed by the formed cementitious powder layer in the cement mortar system can achieve good bonding at the interface transition region between the concrete and the light-transmitting spherical particles, and significantly improve the interfacial bond strength.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A preparation method of special-shaped light-transmitting concrete based on concrete 3D printing is characterized by comprising the following steps: the method comprises the following steps:
s1, selecting materials: selecting the following components by mass for later use, 160-180 parts of water, 350-370 parts of portland cement, 10-15 parts of sulphoaluminate cement, 60-70 parts of silica fume, 4-8 parts of short fiber, 2-4 parts of polycarboxylic acid water reducing agent, 4-8 parts of expanding agent, 10-20 parts of cellulose and 1300-1400 parts of medium sand;
s2, feeding: adding water, ordinary portland cement, sulphoaluminate cement, silica fume, short fibers, a polycarboxylic acid water reducing agent, an expanding agent, cellulose and medium sand into a concrete mixer, uniformly mixing the materials by using the concrete mixer, and then conveying the mixed raw materials into a charging barrel in a 3D printer by using a screw type pulp shooting machine;
s3, laying light guide materials: arranging a light guide material on a bottom template according to a design pattern, and placing the template on a printing platform;
s4, 3D printing: starting a 3D printer, forming a shell and an internal connection on a template by using a 3D printer nozzle according to design, arranging reinforced connection screw-thread steel inside the shell, pouring self-compacting mortar inside the formed shell, covering the screw-thread steel and a light guide material, and vibrating;
s5, modifying: cutting off redundant light guide materials in the formed concrete block;
s6, maintenance: and (4) building a greenhouse, and moving the formed concrete blocks to be maintained by using the printing platform.
2. The preparation method of the special-shaped light-transmitting concrete based on the concrete 3D printing according to claim 1, characterized by comprising the following steps: when the S1 is selected, the following components are selected for standby use, by mass, 170 parts of water, 364.5 parts of portland cement, 13.5 parts of sulphoaluminate cement, 65.25 parts of silica fume, 6.75 parts of short fibers, 2.9 parts of a polycarboxylic acid water reducing agent, 6.3 parts of an expanding agent, 10 parts of cellulose and 1350 parts of medium sand.
3. The preparation method of the special-shaped light-transmitting concrete based on the concrete 3D printing, according to claim 1, is characterized in that: and when the S2 is used for feeding, the mixed raw materials are conveyed into a charging barrel of the 3D printer by using a screw type pulp shooting machine, and the 3D printer is used for printing to finish the special-shaped structure.
4. The preparation method of the special-shaped light-transmitting concrete based on the concrete 3D printing according to claim 1, characterized by comprising the following steps: and S3, when the light guide material is distributed, distributing the light guide material according to the design pattern, and adopting the plastic optical fiber as the light guide material.
5. The preparation method of the special-shaped light-transmitting concrete based on the concrete 3D printing according to claim 1, characterized by comprising the following steps: and when the S1 is selected, 5-10 parts of a thickening rheological agent is also selected, wherein the thickening rheological agent is a sodium cellulose salt thickening rheological agent.
6. The preparation method of the special-shaped light-transmitting concrete based on the concrete 3D printing according to claim 1, characterized by comprising the following steps: when the S1 is selected, the particle size of the silica fume is 0.1-0.3 mm.
7. The preparation method of the special-shaped light-transmitting concrete based on the concrete 3D printing according to claim 1, characterized by comprising the following steps: after the curing in S6, performing S7 a test step, wherein S7 includes: whether the concrete block has cracks or not is detected, and meanwhile, the compactness of the concrete block is detected.
8. The preparation method of the special-shaped light-transmitting concrete based on the concrete 3D printing according to claim 1, characterized by comprising the following steps: when the S1 is selected, 30-40 parts of steel fiber are also included.
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