CN116161921A - High-elastic-modulus concrete material for 3D printing and preparation method thereof - Google Patents
High-elastic-modulus concrete material for 3D printing and preparation method thereof Download PDFInfo
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- CN116161921A CN116161921A CN202211567091.8A CN202211567091A CN116161921A CN 116161921 A CN116161921 A CN 116161921A CN 202211567091 A CN202211567091 A CN 202211567091A CN 116161921 A CN116161921 A CN 116161921A
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- 239000000463 material Substances 0.000 title claims abstract description 50
- 238000010146 3D printing Methods 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000000835 fiber Substances 0.000 claims abstract description 31
- 239000000203 mixture Substances 0.000 claims abstract description 28
- 238000003756 stirring Methods 0.000 claims abstract description 28
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 21
- 229920003086 cellulose ether Polymers 0.000 claims abstract description 14
- 239000004743 Polypropylene Substances 0.000 claims abstract description 10
- -1 polypropylene Polymers 0.000 claims abstract description 8
- 229920001155 polypropylene Polymers 0.000 claims abstract description 8
- 239000004576 sand Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 2
- 239000013305 flexible fiber Substances 0.000 claims description 2
- 230000003068 static effect Effects 0.000 abstract description 3
- 238000005303 weighing Methods 0.000 description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 238000005336 cracking Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 238000007639 printing Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Images
Classifications
-
- 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
- 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
-
- 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
- C04B2111/50—Flexible or elastic materials
- C04B2111/503—Elastic materials
-
- 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
-
- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
-
- 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
Abstract
The invention discloses a high-elastic-modulus concrete material for 3D printing and a preparation method thereof, wherein the high-elastic-modulus concrete material comprises the following components in parts by weight: 0.2-0.3 part of water, 1.5-1.7 parts of coarse aggregate, 0.4 part of cementing material, 0.0003-0.0005 part of cellulose ether, 0.002-0.004 part of fiber and 0.002-0.003 part of water reducer. The preparation method comprises the following steps: according to the formula proportion of the concrete material, the cementing material, the coarse aggregate, the cellulose ether, the water and the polypropylene fiber are metered and taken, the pre-stirring is carried out for half a minute, the pre-mixture is obtained, the water reducing agent and the fiber are added and slowly stirred for 2 minutes, and after standing for 1 minute, the final mixture is obtained after quick stirring for 2 minutes. The static yield stress of the 3D printing concrete meets 2000-3000Pa, the fluidity meets 150-180mm, and the slump of the cylinder is smaller than 10mm, so that the 3D printing building structure is changed from traditional brittle fracture to ductile fracture, the printability is met, the material performance, the interface performance and the shrinkage crack resistance are improved, and the safety of the 3D printing building structure is ensured.
Description
Technical Field
The invention relates to the technical field of intelligent manufacturing of civil engineering materials, in particular to a high-elasticity-modulus concrete material for 3D printing and a preparation method thereof.
Background
In recent years, 3D printing technology has been developed at a high speed, and 3D printed concrete buildings are in the corner of the world, for example: a batch of concrete buildings for demonstration are printed on the places such as the Shanghai and Beijing in China, and as the 3D printing concrete technology has the advantages of high mechanization degree, labor cost reduction, efficiency improvement and the like, along with the continuous promotion of upgrading and transformation in the building industry, the 3D printing technology becomes a necessary development trend of industrialization and digitalization in the future building industry. If focusing on the research field, most domestic scholars only build research on the basis of the development trend and potential of the concrete 3D printing technology, but neglect the research on the 3D printing deep technology and mechanism; foreign scholars are more deeply researched than Chinese scholars, and the foreign scholars pay more attention to the influence of environment, printer parameters, material properties and the like on the 3D printing concrete performance, and explore the effect of adjusting other parameters on the basis of not doping fibers so as to achieve the concrete performance.
The defects of the existing 3D printing concrete technology are mainly concentrated on the fact that the bonding between layers is not tight in the printing process, so that the interface bonding force is weak, the overall mechanical property is anisotropic, the durability of a finished product is poor after printing is finished, and the shrinkage cracking risk is high. The main reasons are as follows:
1. in the aspect of material mix proportion design, most of researches only consider taking printability as a design index, and in order to meet the requirements of pumping and extrusion in the printing process, the dosage of cementing materials in 3D printing concrete is generally higher, and a series of shrinkage cracking and subsequent durability problems are easily caused;
2. because of a special lamination forming process or when printing parameters are not matched or material performance is poor, the actual printing process can cause the increase of interlayer area pores and the reduction of interlayer performance, so that the 3D printed concrete generates mechanical anisotropy.
Disclosure of Invention
The invention aims to provide a high-elastic-modulus concrete material for 3D printing and a preparation method thereof, which are used for solving the application problem of the traditional 3D printing concrete material as 3D printing ink in engineering. The 3D printing building structure is changed from traditional brittle fracture to ductile fracture, the printability is met, the material performance, the interface performance and the shrinkage cracking resistance are improved, and the safety of the 3D printing building structure is ensured.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention provides a high-elastic-modulus concrete material for 3D printing, which comprises the following components in parts by weight: 0.2-0.3 part of water, 1.5-1.7 parts of coarse aggregate, 0.4 part of cementing material, 0.0003-0.0005 part of cellulose ether, 0.002-0.004 part of fiber and 0.002-0.003 part of water reducer.
Further, the coarse aggregate is machine-made sand with the particle size smaller than 5 mm.
Further, the fibers are flexible fibers, including PP, PET, POM fibers.
Further, the cementing material is P.II 52.5R type cement.
The invention provides a preparation method of a high-elasticity-modulus concrete material for 3D printing, which comprises the following steps:
according to the formula proportion of the concrete material, the cementing material, the coarse aggregate, the cellulose ether, the water and the polypropylene fiber are metered and stirred for half a minute to obtain a pre-mixture, then the water and the fiber are added for slow stirring for 2 minutes, and after standing for 1 minute, the mixture is quickly stirred for 2 minutes to obtain the final mixture.
Further, the slow mixing rotating speed is 57-67r/min, and the fast mixing rotating speed is 115-135r/min.
Based on the technical scheme, the invention has the following beneficial effects:
(1) The printability is used as a design index, and meanwhile, the mechanical property and the shrinkage property of the 3D printed concrete are further tested, so that guidance is provided for engineering application of the 3D printed concrete structure to a certain extent.
(2) According to the invention, the rheological property of the concrete meets the printable requirement by regulating the mixing ratio. The mechanical property of the 3D printing shrinkage cracking is improved to a certain extent while the 3D printing shrinkage cracking is restrained, and the shrinkage value is reduced. The formula 28d has the highest compressive strength of 80MPa, the highest elastic modulus of 40GPa and the 3d shrinkage value of less than 1 per mill, and can meet the printing requirements of group landscape small products.
(3) The static yield stress of the 3D printing concrete meets 2000-3000Pa, the fluidity meets 150-180mm, the slump of the cylinder is smaller than 10mm (the cylinder size is 80 mm), the 3D printing building structure is changed from traditional brittle fracture to ductile fracture, the printability is met, the material performance, the interface performance and the shrinkage cracking resistance are improved, and the safety of the 3D printing building structure is ensured.
Drawings
FIG. 1 is a trend graph of the impact of rheological properties of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. Based on the examples herein, other embodiments will be apparent to those of ordinary skill in the art without undue burden from the present disclosure.
Example 1
According to the formula proportion of the concrete material, weighing 0.4 part of cementing material, 1.5 parts of machine-made sand coarse aggregate, 0.0005 part of cellulose ether, 0.3 part of weighing water, 0.003 part of 6mm polypropylene fiber and 0.0025 part of water reducer, pre-stirring for half a minute to obtain a pre-mixture, adding water, the water reducer and the fiber, slowly stirring for 2 minutes, standing for 1 minute, and quickly stirring for 2 minutes to obtain the final mixture.
Example 2
According to the formula proportion of the concrete material, weighing 0.4 part of cementing material, 1.5 parts of machine-made sand coarse aggregate, 0.0005 part of cellulose ether, 0.3 part of weighing water, 0.004 part of 6mm polypropylene fiber and 0.0025 part of water reducer, pre-stirring for half a minute to obtain a pre-mixture, adding water, the water reducer and the fiber, slowly stirring for 2 minutes, standing for 1 minute, and quickly stirring for 2 minutes to obtain the final mixture.
Example 3
According to the formula proportion of the concrete material, weighing 0.4 part of cementing material, 1.5 parts of machine-made sand coarse aggregate, 0.0005 part of cellulose ether, 0.3 part of weighing water, 0.002 part of 9mm polypropylene fiber and 0.0025 part of water reducer, pre-stirring for half a minute to obtain a pre-mixture, adding water, the water reducer and the fiber, slowly stirring for 2 minutes, standing for 1 minute, and quickly stirring for 2 minutes to obtain the final mixture.
Example 4
According to the formula proportion of the concrete material, weighing 0.4 part of cementing material, 1.5 parts of machine-made sand coarse aggregate, 0.0005 part of cellulose ether, 0.3 part of weighing water, 0.003 part of 9mm polypropylene fiber and 0.0025 part of water reducer, pre-stirring for half a minute to obtain a pre-mixture, adding water, the water reducer and the fiber, slowly stirring for 2 minutes, standing for 1 minute, and quickly stirring for 2 minutes to obtain the final mixture.
Example 5
According to the formula proportion of the concrete material, weighing 0.4 part of cementing material, 1.5 parts of machine-made sand coarse aggregate, 0.0005 part of cellulose ether, 0.3 part of weighing water, 0.004 part of 9mm polypropylene fiber and 0.0025 part of water reducer, pre-stirring for half a minute to obtain a pre-mixture, adding water, the water reducer and the fiber, slowly stirring for 2 minutes, standing for 1 minute, and quickly stirring for 2 minutes to obtain the final mixture.
Example 6
According to the formula proportion of the concrete material, weighing 0.4 part of cementing material, 1.5 parts of machine-made sand coarse aggregate, 0.0005 part of cellulose ether, 0.3 part of weighing water, 0.003 part of 9mm PET and 0.0025 part of water reducer, pre-stirring for half a minute to obtain a pre-mixture, adding water, the water reducer and the fiber, slowly stirring for 2 minutes, standing for 1 minute, and rapidly stirring for 2 minutes to obtain the final mixture.
Example 7
According to the formula proportion of the concrete material, weighing 0.4 part of cementing material, 1.5 parts of machine-made sand coarse aggregate, 0.0005 part of cellulose ether, 0.3 part of weighing water, 0.004 part of 9mm PET and 0.0025 part of water reducer, pre-stirring for half a minute to obtain a pre-mixture, adding water, the water reducer and the fiber, slowly stirring for 2 minutes, standing for 1 minute, and rapidly stirring for 2 minutes to obtain the final mixture.
Comparative example 1
According to the formula proportion of the concrete material, weighing 0.4 part of cementing material, 1.5 parts of machine-made sand coarse aggregate, 0.0005 part of cellulose ether, 0.3 part of weighing water and 0.0025 part of water reducer, pre-stirring for half a minute to obtain a pre-mixture, adding water, the water reducer and the fiber, slowly stirring for 2 minutes, standing for 1 minute, and rapidly stirring for 2 minutes to obtain the final mixture.
The concrete was tested for cylinder slump, static yield stress, fluidity with reference to 3D printed concrete mix performance test method to determine if printable requirements were met, and the results are shown in table 1.
The mechanical properties of the concrete formulation were tested with reference to the test method for basic mechanical properties of 3D printed concrete, and the results are shown in Table 1.
As shown in table 1, the rheological properties increased with the incorporation of the fibers, and in particular, the rheological properties increased with the increase in the amount of the incorporated fibers and the aspect ratio.
As shown in Table 1, comparative examples 1, 4 and 6 show that the mechanical properties are correspondingly increased along with the increase of the length-diameter ratio of the fiber, and the compression resistance, the flexural strength and the elastic modulus of 28d can reach 80MPa, 15MPa and 40GPa respectively.
As shown in fig. 1, the constructability and printability of the 3D printing formulation increases with the addition of silica fume, fiber; the mixing amount of the fly ash and the tungsten tailings is reduced along with the increase; the mixing amount of mineral powder is increased and then decreased.
Claims (6)
1. The high-elastic-modulus concrete material for 3D printing is characterized by comprising the following components in parts by weight: 0.2-0.3 part of water, 1.5-1.7 parts of coarse aggregate, 0.4 part of cementing material, 0.0003-0.0005 part of cellulose ether, 0.002-0.004 part of fiber and 0.002-0.003 part of water reducer.
2. The high elastic modulus concrete material for 3D printing according to claim 1, wherein the coarse aggregate is machine-made sand with a grain size of < 5 mm.
3. A high elastic modulus concrete material for 3D printing according to claim 1, wherein the fibers are flexible fibers, including PP, PET, POM fibers.
4. The high elastic modulus concrete material for 3D printing according to claim 1, wherein the cementing material is p.ii 52.5R type cement.
5. The preparation method of the high-elasticity-modulus concrete material for 3D printing is characterized by comprising the following steps of:
according to the formula proportion of the concrete material, the cementing material, the coarse aggregate, the cellulose ether, the water and the polypropylene fiber are metered and stirred for half a minute to obtain a pre-mixture, then the water, the water reducing agent and the fiber are added for slow stirring for 2 minutes, and after standing for 1 minute, the mixture is quickly stirred for 2 minutes to obtain the final mixture.
6. The method for preparing the high-elasticity-modulus concrete material for 3D printing according to claim 5, wherein the slow mixing rotating speed is 57-67r/min, and the fast mixing rotating speed is 115-135r/min.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211567091.8A CN116161921A (en) | 2022-12-07 | 2022-12-07 | High-elastic-modulus concrete material for 3D printing and preparation method thereof |
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| CN202211567091.8A CN116161921A (en) | 2022-12-07 | 2022-12-07 | High-elastic-modulus concrete material for 3D printing and preparation method thereof |
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Citations (6)
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|---|---|---|---|---|
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| CN108529968A (en) * | 2018-04-25 | 2018-09-14 | 浙江大学 | A kind of fiber concrete material and preparation method thereof for 3D printing |
| CN108658546A (en) * | 2018-06-05 | 2018-10-16 | 北京美斯顿科技开发有限公司 | A kind of 3D printing construction material and its application |
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| CN110317027A (en) * | 2019-07-01 | 2019-10-11 | 成都建工赛利混凝土有限公司 | A kind of lower shrinkage 3D printing mortar and preparation method thereof |
| RU2784503C1 (en) * | 2021-12-30 | 2022-11-28 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский государственный архитектурно-строительный университет" (КазГАСУ) | Concrete mix for layer-by-layer extrusion (3d printing) |
-
2022
- 2022-12-07 CN CN202211567091.8A patent/CN116161921A/en active Pending
Patent Citations (6)
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|---|---|---|---|---|
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| CN110317027A (en) * | 2019-07-01 | 2019-10-11 | 成都建工赛利混凝土有限公司 | A kind of lower shrinkage 3D printing mortar and preparation method thereof |
| RU2784503C1 (en) * | 2021-12-30 | 2022-11-28 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский государственный архитектурно-строительный университет" (КазГАСУ) | Concrete mix for layer-by-layer extrusion (3d printing) |
Non-Patent Citations (1)
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