CN109180112A - A kind of light-high-strength cement hollow wall plank stuff production technology and wall board - Google Patents
A kind of light-high-strength cement hollow wall plank stuff production technology and wall board Download PDFInfo
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- CN109180112A CN109180112A CN201811368219.1A CN201811368219A CN109180112A CN 109180112 A CN109180112 A CN 109180112A CN 201811368219 A CN201811368219 A CN 201811368219A CN 109180112 A CN109180112 A CN 109180112A
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- Prior art keywords
- hollow wall
- light
- raw material
- mold
- cement hollow
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Classifications
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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
- C04B28/04—Portland cements
-
- 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
- B33Y70/00—Materials specially adapted for additive manufacturing
-
- 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
-
- 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
- C04B2111/40—Porous or lightweight materials
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Finishing Walls (AREA)
Abstract
The present invention provides a kind of light-high-strength cement hollow wall plank stuff production technology and wall boards, are related to building material technical field.The main preparation by raw material, empty mold, 3D printing obtain bottom, arrange core pipe, and 3D printing obtains surface layer, whole to carry out steam curing, remove mold, core pipe finally up to cement hollow wall plate.The production technology, on the basis of combining mold, mainly formed by the way of 3D printing, gained wall board lightweight, high intensity, it is waterproof, do not crack, antidetonation, good toughness, installation assembled can be used, multi-layer board installation when interlayer can increase fire-blocking belt, and plate can carry decorative cover, it is at low cost, easy to install, can Reusability, to reduce building waste, while can also customize personalized wallboard according to the demand of user.
Description
Technical field
The present invention relates to building material technical fields, refer in particular to a kind of light-high-strength cement hollow wall plate production
Technique and wall board.
Background technique
In the prior art, there are mainly three types of moulding process currently on the market for brick body (wall) material product:
1. dry-pressing formed: material plus a small amount of adhesive being granulated, is then charged into mold, pressurizes on press machine, make powder
Grain is close to each other in mold, and is securely joined with by means of internal friction, forms the green body of certain shapes.At induction heating surface heat
Reason.
Feature: simple production
Performance: it is big to be pressed into rear density
Advantage: with short production cycle
It is insufficient: to lay particular stress on, construction and installation is slow and high labor cost, mold cost is high, product strength is low, the close property of interiors of products
Inconsistent, uniform texture is poor, frangibility.
2. extrusion molding: being to pass through molding die orifice, a kind of technique of extrusion molding with extruder.
Cement hollow wall panel is squeezed out, surface is smooth, but (because forming die orifice, adds fiber meeting because reinforcing material can not be added
Block) so product is also not affected by the favor in market, or even have security risk, market and national dependent part are not all obtained so far
The approval of door unit.
3. cast molding: in mounted model in advance, concrete is poured into, by again will be external after solidifying for a long time
Model is removed.
Feature: volume is big
Performance: sound insulation is good
Advantage: bearing capacity is good
Insufficient: construction is complicated, time-consuming, removes after needing to install model, the later period needs artificial watering to safeguard, volume
Greatly, thick and heavy, no decoration function, at high cost, low efficiency is easy cracking, and density is inconsistent.
Prior art is not possible to produce ultra-thin cement hollow wallboard at present, and wall thickness can not use substantially in 8mm or less
Prior art molding, so lightweight, high intensity and the cement wall plate for having certain flexibility can not be produced.
Summary of the invention
The technical problems to be solved by the present invention are: how to produce lightweight, high-intensitive cement wall plate out in enormous quantities.
In order to solve the above-mentioned technical problem, the invention discloses a kind of light-high-strength cement hollow wall plates to produce work
Skill includes the following steps:
S1, preparation form the raw material of cement hollow wall plate, prepare empty mold；
S2, raw material is gradually injected into mold by the way of 3D printing, and forms bottom；
S3, hollow core pipe is used to form in arrangement on bottom；
S4, it gradually injects raw material into mold by the way of 3D printing again, and forms surface layer；
S5, whole progress steam curing；
S6, mold is removed, extracts core pipe out, obtains cement hollow wall plate.
In further embodiment, in S2 the and S4 step, when containing fiber in raw material, fiber and remaining raw material
It is injected separately into mold from different 3D printing heads, and remaining raw material need to be uniformly mixed before printing.
In further embodiment, the S2 step inject raw material before, into the mold be placed in bottom screen cloth and/or
Deformed steel bar, to enhance the performance of bottom.
In further embodiment, the S4 step inject raw material before, into the mold be placed in surface layer screen cloth and/or
Deformed steel bar, to enhance the performance on surface layer.
In further embodiment, in the S4 step, including the surface layer is surface-treated, obtains required table
Face pattern or surface texture.
In further embodiment, in the S5 step, the steam curing 11-13h at 70-90 DEG C.
In addition, on this basis, also disclosing a kind of light-high-strength cement hollow wall plate adopting the technique and being formed
Material, by weight, the raw material components include:
In further embodiment, the cement is 42.5R cement, and the wood powder is 60-80 mesh wood powder.
In further embodiment, SiO in the flyash2And Al2O3Total content be greater than 78%, loss on ignition less than 8%,
0.08mm is tailed over less than 15%.
In further embodiment, the additive is waterproofing agent, fireproof agent, preservative, water-reducing agent, one in cellulose
Kind is a variety of.
In further embodiment, the cement hollow wall plate with a thickness of 40-250mm, width 300mm-
The two sides of 1200mm, height/length 1000mm-3300mm, wall thickness 5mm-20mm, wall are respectively provided with splicing
The two sides of fin and groove or wall are respectively provided with the groove of splicing.
Light-high-strength cement hollow wall plate disclosed by the invention and its production technology, on the basis for combining mold
On, mainly formed by the way of 3D printing, gained wall board lightweight, high intensity, it is waterproof, do not crack, be antidetonation, tough
Property it is good, installation can be used assembled, and interlayer can increase fire-blocking belt when multi-layer board is installed, and plate can carry decorative cover, at
This is low, easy to install, can Reusability, to reduce building waste, while can also customize personalized wall according to the demand of user
Plate.
Detailed description of the invention
Specific structure of the invention is described in detail with reference to the accompanying drawing
Fig. 1 is the moulding process figure of light-high-strength cement hollow wall plate of the invention；
Fig. 2 is a kind of hollow double sheets structure schematic diagram of round hole of the present invention；
Fig. 3 is a kind of hollow three ply board material structural schematic diagram of round hole of the present invention；
Fig. 4 is a kind of hollow double sheets structure schematic diagram of square hole of the present invention；
Fig. 5 is the hollow double sheets structure schematic diagram of another square hole of the present invention；
Fig. 6 is a kind of hollow three ply board material structural schematic diagram of round hole of the present invention.
In figure, including the surface layer 1-, 2- groove, the hole 3-, 4- bottom, 5- fin.
Specific embodiment
In order to describe the technical content, the structural feature, the achieved object and the effect of this invention in detail, below in conjunction with embodiment
And attached drawing is cooperated to be explained in detail.
Embodiment 1
In conjunction with the moulding process figure in Fig. 1, firstly, carrying out the preparation of various raw materials and mold.By weight, raw material packet
It includes and meets 60-70 parts of 42.5R cement as defined in GB175-92；Meet as defined in JC/T409-92 flyash 20-30 parts, and fine coal
SiO in ash2And Al2O3Total content is greater than 78%, and loss on ignition is tailed over less than 8%, 0.08mm less than 15%, and the addition of flyash can
The compound with hydraulic gelling performance is generated, as a kind of material for increasing intensity and durability；20-30 parts of silicon ash, as
A kind of efficient active blending material can significantly improve intensity, impermeability, frost resistance and the durability of concrete；Fiber 5-10
Part, fiber can increase intensity, improve impervious, shock resistance, fracture resistance, and pre- crack resistence reinforces the solidifying conjunction of mixture；Additive 5-
6 parts, and wherein additive is one of waterproofing agent, fireproof agent, preservative, water-reducing agent, cellulose or a variety of, can enhance plate
Corresponding property then can suitably increase the amount of fireproof agent if the wall board is mainly used as firewall in additive,
Finally obtained wall board due to fireproof agent addition, even wall board itself is also nonflammable at a higher temperature
It burns, simultaneously because the presence of hollow structure, after the kindling of the one side region of materials for wall, even if at a higher temperature, wall
Plate itself will not only burn, and the combustion zone heat of wall board one side will not conduct easily it is another to wall board
On one side, to play fire prevention, heat insulation well；4-6 parts of 60-80 mesh wood powder can be used as water-retaining agent use；Aglite 15-
25 parts；24-28 parts of water.And add the raw material into mixing apparatus, first dry-mixed stirring, then adds water-wet puddling and mixes, so that
Mixture sufficiently merges mixing, obtains raw material ready for use.Prepare empty mold simultaneously, such as a rectangular channel, the length, width and height of rectangular channel
Can plate specification according to actual needs be configured, holding has needed corresponding structure to design in slot, so that final plate
Side wall can form groove and fin, convenient for splicing installation.Meanwhile rectangular channel can be horizontally placed to work top or production line
On.After later period plate forming, the abjection of mold can be in spraying release agent in a mold at this time.
Then, it is fed injection into above-mentioned rectangle groove mould by the way of 3D printing using print head or spray head, gradually
Inject and formed the bottom of plate.At this point, by the flow of the raw material of control spray head injection and the movement speed of spray head, to control
The thickness of bottom.The characteristics of due to the technique itself, can easily by the wall thickness control of bottom in 8mm hereinafter, simultaneously can be same
When guarantee bottom raw material solidify after plate intensity.
Furthermore arrangement forms hollow core pipe on bottom.Core pipe need to be easy to and cement after in view of later period molding
On the one hand plate separation, demoulding need to be sprayed release agent on the surface of core pipe, be on the other hand preferably made using polyurethane material
Core pipe, be not easy viscous viscous with cement, detached convenient for core pipe after molding.When arranging core pipe, need according to actual needs, such as plate pair
The design of hollow hole selects the core pipe of dimension, such as cylindrical core pipe.Meanwhile core pipe of rationally arranging, as core pipe and core pipe are shown in
Spacing, the spacing between core pipe and mould inner wall need to guarantee finally formed plate uniform wall thickness as far as possible.
Then, it gradually injects raw material into mold by the way of 3D printing again, and forms surface layer.That is, arranging
Formed hollow core pipe and then it is secondary raw material is injected into rectangular mould by the way of 3D printing, not only need so that each core pipe
Between the gap met personally of gap, core pipe and mold wall filled.Meanwhile it also needing to form one layer of tool on core pipe according to design
Have it is specific after surface layer.And the wall thickness on surface layer is preferably the consistency of thickness with bottom, so that the wall thickness of entire wall board
Uniformly.
Then, whole to carry out steam curing.That is, by mold together with injection mold in raw material, core pipe make a gift to someone together it is steam-cured
Room carries out steam curing, specifically can at 70-90 DEG C steam curing 11-13h so that cement hollow plate obtain it is fully hard
Change.
Finally, will integrally remove from steaming oxygen room, and mold is removed, internal core pipe is extracted out, to obtain cement hollow wall
Body plate, structure is as shown in Fig. 2, the hollow wall plate includes the surface layer 1-, 2- groove, the hole 3-, 4- bottom, 5- fin.Its
In, the design of fin 5 and groove 2 is primarily to convenient for the splicing installation between adjacent sheet metal.It is of course also possible in wall
Groove is respectively set in the two sides of plate, specific as shown in Figure 5 for splicing.Meanwhile 3 overall distribution of circular hole therein is uniform,
But also corresponding plate wall thickness is also more uniform.
Embodiment 2
The number of plies of hollow wall plate that the present embodiment 2 is formed needed for essentially consisting in from the difference of embodiment 1 is different, implements
It is only bottom and surface layer in example 1, is then hollow circular hole between bottom and surface layer.In example 2, after forming bottom, the bottom of in
Round core pipe is set on layer, gradually injects raw material into mold by the way of 3D printing again, and form middle layer；In formation
Round core pipe is set in middle layer again after interbed, and gradually injects raw material into mold by the way of 3D printing again, shape
At surface layer.It in this way, it includes bottom, middle layer and surface layer that obtained hollow wall plate, which is then, and is all round between adjacent two layers
To form hollow structure, specific structure can be as shown in Figure 3 in shape hole.
In view of sometimes requiring that the thickness of hollow wall plate entirety is thicker according to different application scenarios.Have plenty of straight
It connects and increases aperture, have plenty of the wall thickness for directly increasing plate, similar to directly simply multiple amplifies by the structure in such as Fig. 2.
But in the present solution, preferred design multilayer.I.e. by increasing a middle layer and corresponding hollow aperture layer, so that entire hollow
The thickness of wall board is increased, to meet the application of different scenes.And this hollow wall plate, have more preferably every
Sound, heat insulation.
Embodiment 3
The present embodiment 3 is essentially consisted in the difference for implementing 1, and rectangular core pipe is used in embodiment 3, so finally obtained
Hollow wall plate then has rectangular hollow hole, and specific structure is as shown in Figure 4 and Figure 5.
Meanwhile also screen cloth can be laid in a mold as reinforcing material before raw material is injected in 3D printing.Screen cloth and injection
Raw material be incorporated in, the mechanical property of finally obtained hollow wall plate can be remarkably reinforced.In the present embodiment, right
When including fiber in raw material, it is contemplated that if fiber and remaining raw material are pre-mixed uniformly carries out 3D printing again, can easily snap off
Fiber in mixture.Therefore preferably before 3D printing, remaining raw material is pre-mixed uniformly, and fiber is individually from another print head
Injection (is not added in mixed slurry) into mold, can so keep tenacity of fibre, it is not easy to and it is disconnected, and eject
Fiber distribution it is also relatively uniform.
Furthermore in the present embodiment 3, surface layer can also be surface-treated after forming surface layer.Such as, surface is struck off,
So that plate surface is more smooth.Can also take advantage of it is unhardened before, surface formed it is various required for plane patterns, space pattern
Or other surface textures, so that the surface can be directly as decorative cover.
Embodiment 4
The present embodiment 4 is essentially consisted in the difference for implementing 2, and rectangular core pipe is used in embodiment 4, so finally obtained
Hollow wall plate then has rectangular hollow hole, and specific structure is as shown in figure 4, include two layers of rectangular hollow pore structure.
Meanwhile also deformed steel bar can be laid in mold as reinforcing material before raw material is injected in 3D printing.Deformed steel bar and injection
Raw material be incorporated in, deformed steel bar can hinder the contraction of raw material, and finally obtained hollow wall board can be remarkably reinforced
The mechanical property of material.
The wall that light-high-strength cement hollow wall plate in the present invention is formed compared with the prior art in aerating
Mixed mud brick is made for wall, and light-high-strength cement hollow wall plate is light, high-intensitive, not only the material of every square meter wall
Expect that cost is lower, and due to light and easy to install, so also cost is also lower for construction, overall cost is substantially aerating mixed mud brick
The one third of wall is made.Therefore the light-high-strength cement hollow wall plate in the present invention more has market economy valence
Value.
Herein, up, down, left, right, before and after only represents its relative position without indicating its absolute position.The foregoing is merely
The embodiment of the present invention is not intended to limit the scope of the invention, all to utilize description of the invention and accompanying drawing content institute
The equivalent structure or equivalent flow shift of work is applied directly or indirectly in other relevant technical fields, and is similarly included in
In scope of patent protection of the invention.
Claims (10)
1. a kind of light-high-strength cement hollow wall plank stuff production technology, which comprises the steps of:
S1, preparation form the raw material of cement hollow wall plate, prepare empty mold；
S2, raw material is gradually injected into mold by the way of 3D printing, and forms bottom；
S3, hollow core pipe is used to form in arrangement on bottom；
S4, it gradually injects raw material into mold by the way of 3D printing again, and forms surface layer；
S5, whole progress steam curing；
S6, mold is removed, extracts core pipe out, obtains cement hollow wall plate.
2. light-high-strength cement hollow wall plank stuff production technology as described in claim 1, it is characterised in that: the S2 and
In S4 step, when containing fiber in raw material, fiber is injected separately into mold from remaining raw material from different 3D printing heads, and
Remaining raw material need to be uniformly mixed before printing.
3. light-high-strength cement hollow wall plank stuff production technology as claimed in claim 2, it is characterised in that: in the S2
Before step injects raw material, it is placed in bottom screen cloth and/or deformed steel bar, into the mold to enhance the performance of bottom.
4. light-high-strength cement hollow wall plank stuff production technology as claimed in claim 2, it is characterised in that: in the S4
Before step injects raw material, it is placed in surface layer screen cloth and/or deformed steel bar, into the mold to enhance the performance on surface layer.
5. light-high-strength cement hollow wall plank stuff production technology as described in claim 3 or 4, it is characterised in that: described
In S4 step, including the surface layer is surface-treated, obtains required picture on surface or surface texture.
6. light-high-strength cement hollow wall plank stuff production technology as claimed in claim 5, it is characterised in that: the S5 step
In rapid, the steam curing 11-13h at 70-90 DEG C.
7. a kind of light-high-strength cement hollow wall plate formed using the technique as described in claim any one of 1-6,
It is characterized in that, by weight, used raw material components include:
8. light-high-strength cement hollow wall plate as claimed in claim 7, it is characterised in that: the cement is 42.5R
Cement；The wood powder is 60-80 mesh wood powder；SiO in the flyash2And Al2O3Total content is greater than 78%, and loss on ignition is less than
8%, 0.08mm are tailed over less than 15%.
9. light-high-strength cement hollow wall plate as claimed in claim 7, it is characterised in that: the additive is waterproof
One of agent, fireproof agent, preservative, water-reducing agent, cellulose are a variety of.
10. light-high-strength cement hollow wall plate as claimed in claim 7, it is characterised in that: the cement hollow wall
Body plate with a thickness of 40-250mm, width 300mm-1200mm, height/length 1000mm-3300mm, wall thickness 5mm-
The two sides of 20mm, fin and groove or wall that the two sides of wall are respectively provided with splicing are respectively provided with splicing
Groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811368219.1A CN109180112A (en) | 2018-11-16 | 2018-11-16 | A kind of light-high-strength cement hollow wall plank stuff production technology and wall board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811368219.1A CN109180112A (en) | 2018-11-16 | 2018-11-16 | A kind of light-high-strength cement hollow wall plank stuff production technology and wall board |
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| Publication Number | Publication Date |
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| CN109180112A true CN109180112A (en) | 2019-01-11 |
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| CN201811368219.1A Pending CN109180112A (en) | 2018-11-16 | 2018-11-16 | A kind of light-high-strength cement hollow wall plank stuff production technology and wall board |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110331887A (en) * | 2019-08-01 | 2019-10-15 | 河北昊瑞坤数字科技有限公司 | A kind of multifunctional all 3D printing building enclosure wall |
| CN110397159A (en) * | 2019-08-01 | 2019-11-01 | 河北昊瑞坤数字科技有限公司 | A kind of 3D printing structure |
| CN111452181A (en) * | 2020-06-01 | 2020-07-28 | 上海言诺建筑材料有限公司 | 3D printing building and preparation method thereof |
| CN111485667A (en) * | 2019-01-25 | 2020-08-04 | 杨猛 | 3d printing customized building block brick and method for building complex wall body by same |
| CN112976223A (en) * | 2021-03-11 | 2021-06-18 | 常州纺织服装职业技术学院 | Method for preparing noise reduction barrier for expressway |
| EP4011581A1 (en) * | 2020-12-14 | 2022-06-15 | Saint-Gobain Weber France | 3d printing method for producing an object from concrete or mortar with a feedthrough |
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| CN1272470A (en) * | 2000-05-09 | 2000-11-08 | 袁同新 | Aerated concrete light wall panel and its production method |
| CN106186974A (en) * | 2016-07-11 | 2016-12-07 | 南京理工大学 | Green building material for 3D printing and printing method thereof |
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| CN1272470A (en) * | 2000-05-09 | 2000-11-08 | 袁同新 | Aerated concrete light wall panel and its production method |
| CN106186974A (en) * | 2016-07-11 | 2016-12-07 | 南京理工大学 | Green building material for 3D printing and printing method thereof |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111485667A (en) * | 2019-01-25 | 2020-08-04 | 杨猛 | 3d printing customized building block brick and method for building complex wall body by same |
| CN110331887A (en) * | 2019-08-01 | 2019-10-15 | 河北昊瑞坤数字科技有限公司 | A kind of multifunctional all 3D printing building enclosure wall |
| CN110397159A (en) * | 2019-08-01 | 2019-11-01 | 河北昊瑞坤数字科技有限公司 | A kind of 3D printing structure |
| CN110331887B (en) * | 2019-08-01 | 2024-07-12 | 河北昊瑞坤数字科技有限公司 | Multifunctional integrated 3D printing building enclosure wall |
| CN111452181A (en) * | 2020-06-01 | 2020-07-28 | 上海言诺建筑材料有限公司 | 3D printing building and preparation method thereof |
| EP4011581A1 (en) * | 2020-12-14 | 2022-06-15 | Saint-Gobain Weber France | 3d printing method for producing an object from concrete or mortar with a feedthrough |
| WO2022128472A1 (en) * | 2020-12-14 | 2022-06-23 | Saint Gobain Weber France | 3d printing method for producing an article made of concrete or mortar and having a through-opening |
| CN112976223A (en) * | 2021-03-11 | 2021-06-18 | 常州纺织服装职业技术学院 | Method for preparing noise reduction barrier for expressway |
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Application publication date: 20190111 |