CN112374825A - 3D printing tough concrete material and preparation method thereof - Google Patents
3D printing tough concrete material and preparation method thereof Download PDFInfo
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- CN112374825A CN112374825A CN202011182884.9A CN202011182884A CN112374825A CN 112374825 A CN112374825 A CN 112374825A CN 202011182884 A CN202011182884 A CN 202011182884A CN 112374825 A CN112374825 A CN 112374825A
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- 239000004567 concrete Substances 0.000 title claims abstract description 58
- 239000000463 material Substances 0.000 title claims abstract description 55
- 238000010146 3D printing Methods 0.000 title claims abstract description 51
- 238000002360 preparation method Methods 0.000 title claims description 8
- 239000000835 fiber Substances 0.000 claims abstract description 28
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 15
- 239000011707 mineral Substances 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 239000004568 cement Substances 0.000 claims abstract description 7
- 239000008030 superplasticizer Substances 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 238000003756 stirring Methods 0.000 claims description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 16
- 239000000843 powder Substances 0.000 claims description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000003638 chemical reducing agent Substances 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 12
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 12
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 12
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 12
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 12
- 239000011268 mixed slurry Substances 0.000 claims description 12
- 239000004743 Polypropylene Substances 0.000 claims description 10
- 239000006004 Quartz sand Substances 0.000 claims description 10
- 239000010881 fly ash Substances 0.000 claims description 10
- -1 polypropylene Polymers 0.000 claims description 10
- 229920001155 polypropylene Polymers 0.000 claims description 10
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 6
- 229920005646 polycarboxylate Polymers 0.000 claims description 6
- 239000011863 silicon-based powder Substances 0.000 claims description 6
- 239000011398 Portland cement Substances 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 4
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 2
- 239000002956 ash Substances 0.000 claims description 2
- 229920000570 polyether Polymers 0.000 claims description 2
- 239000004576 sand Substances 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000007639 printing Methods 0.000 description 22
- 239000002245 particle Substances 0.000 description 20
- 238000005516 engineering process Methods 0.000 description 9
- 238000011161 development Methods 0.000 description 5
- 230000018109 developmental process Effects 0.000 description 5
- 239000000956 alloy Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 229920003086 cellulose ether Polymers 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910021487 silica fume Inorganic materials 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000011664 nicotinic acid Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Composite Materials (AREA)
- Manufacturing & Machinery (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a 3D printing tough concrete material which is characterized by comprising the following components in percentage by weight: 25-45% of cement; 8-25% of a mineral admixture; 1.5-5.0% of fibers; 25-50% of fine aggregate; 0.8-1.5% of a superplasticizer. The concrete raw material composition is simple and rich in source, the consumption of 3D printing concrete materials can be reduced, and the production cost is reduced. The 3D printed concrete material disclosed by the invention has excellent impermeability, and the whole concrete structure has good integrity, ductility and seismic resistance and energy consumption.
Description
Technical Field
The invention belongs to the technical field of novel building materials, and particularly relates to a 3D printing tough concrete material and a preparation method thereof.
Background
In recent years, 3D printing technology has been rapidly developed in various industries as a rapidly-developed additive manufacturing technology. Relates to automobile manufacturing, aerospace parts, bones, food, shoes, houses, bridges and the like.
3D printing was derived from the 1860 multi-camera solid sculpturing technology and 1892 landscape forming technology. At the end of the 20 th century, a variety of practical 3D printing technologies and 3D printing devices were invented in succession and developed rapidly. $ 227 billion is expected to cost globally by 2022 for 3D printing technology.
In the field of engineering construction, the 3D printing technology has the advantages of full automation, high modeling freedom, less manual template-free property and the like. With the development of global 3D printing technology and the upgrading and upgrading of 3D printing equipment, more and more 3D printing entity engineering is applied. The method is used for building single-layer and multi-layer buildings, pedestrian bridges, personalized sculptures and 3D printing bionic parts. Further developments in 3D printing technology re-engineering depend on improvements in printing accuracy, speed, stability and security. First, 3D printers need to have precise control and reasonable mechanical construction to meet the requirements of size, precision, stability. Secondly, the program can reasonably determine the path of the spray head and the internal filling mode, so that the macroscopic mechanical property of the component can meet the related requirements, and meanwhile, the structure can be optimized and the materials can be fully utilized. Most importantly, the material needs to be suitable for the 3D printing process with a suitable "time window" (there is a suitable period of time during which the material has fluidity and mechanical properties to ensure that the printing process is not clogged, printable, constructable).
At present, mortar or concrete is basically used in general 3D printing production, a cement-based material is a porous material, the risk of shrinkage cracking exists, the brittleness is high, the crack width is large, particularly the durability after cracking is poor, the performances of shock resistance, impact resistance and fatigue resistance are poor, and the development requirement of modern novel building engineering application cannot be met. The 3D printing special engineering needs individuation, and for a non-curve complex-shaped structure body, particularly a part with high impact frequency, the requirements on the shock resistance, the impact resistance and the fatigue resistance are high, so that the 3D printing concrete is required to have high toughness, and the critical part is required to be reduced in thickness and height and reduce load. The toughening of 3D printing concrete is an important development direction in the future, so that the development of 3D printing toughened concrete materials has important theoretical significance and application value.
Disclosure of Invention
The invention mainly aims to overcome the defects of high brittleness, easy cracking, low strength, poor ductility and long curing time in the existing 3D printing concrete and provide a novel 3D printing tough concrete material and a preparation method thereof. The invention can effectively reduce the consumption of 3D printing concrete materials, improve the impermeability and reduce the production cost, thereby being more practical and having industrial utilization value.
The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme.
The invention provides a 3D printing tough concrete material which is characterized by comprising the following components in percentage by weight:
the 3D printing flexible concrete material is characterized in that the type of the cement is ordinary silicic acid cement PO 42.5 or PO 52.5.
The 3D printing toughened concrete material is characterized in that the mineral admixture mainly comprises the following raw materials in percentage by weight: 15-25% of micro silicon powder, 40-60% of fly ash and 8-20% of mineral powder; wherein, the silicon dioxide in the micro silicon powder is more than or equal to 90 percent; the fly ash is I-grade ash; the mineral powder is S95 grade, and the fineness of the mineral powder is more than or equal to 800 meshes.
The 3D printing tough concrete material is characterized in that the fiber mainly comprises the following raw materials in percentage by weight: 60-80% of steel fiber and 20-40% of polypropylene fiber; wherein the steel fiber is a copper-plated micro-wire with an end hook, the length of the steel fiber is 12mm, and the diameter of the steel fiber is 0.5 mm; the length of the polypropylene fiber is 12-19 mm.
The 3D printing tough concrete material is characterized in that the fine aggregate mainly comprises the following raw materials in percentage by weight: 60-80% of quartz sand and 20-40% of carborundum; the quartz sand is the sand in the second area, the fineness modulus is 2.6-2.9, and the grain size of the carborundum is less than or equal to 4.75 mm.
The 3D printing tough concrete material is characterized in that the superplasticizer mainly comprises the following raw materials in percentage by weight: 65-80% of a polycarboxylic acid water reducing agent and 15-25% of hydroxypropyl methyl cellulose ether; the polycarboxylate superplasticizer is a polyether high-dewatering type, and the viscosity of the hydroxypropyl methyl cellulose ether is 400Pa & s.
The purpose of the invention and the technical problem to be solved are also realized by adopting the following technical scheme.
The invention also provides a preparation method of the 3D printing tough concrete material, which comprises the following steps:
(1) weighing and mixing cement, micro silicon powder, fly ash, mineral powder, quartz sand, carborundum and polypropylene fiber according to a ratio to obtain a mixture;
weighing and mixing a polycarboxylic acid water reducing agent, hydroxypropyl methyl cellulose ether and water according to a ratio to obtain mixed slurry;
(2) and pre-stirring the mixed material, adding the mixed slurry, stirring, adding the steel fiber, and continuously stirring uniformly to obtain the 3D printing tough concrete dry mixed material.
In the preparation method, the mass ratio of the polycarboxylic acid water reducer, the hydroxypropyl methyl cellulose ether and the water is 6: 2: 125.
by the technical scheme, the invention at least has the following advantages: the concrete raw material composition is simple and rich in source, the consumption of 3D printing concrete materials can be reduced, and the production cost is reduced. The 3D printed concrete material disclosed by the invention has excellent impermeability, and the whole concrete structure has good integrity, ductility and seismic resistance and energy consumption.
In conclusion, the special 3D printing tough concrete material has good toughness and impermeability. The concrete has the advantages and practical values, does not have similar design publication or use in similar products, is innovative, has great improvement on the method or the product performance, has great technical progress, produces good and practical effects, has multiple enhanced effects compared with the existing concrete, is more suitable for practical use, has industrial wide utilization value, and is a novel, improved and practical new design.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a detailed description of the preferred embodiments of the present invention.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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, 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
(1) Mixing 400 parts by weight of ordinary Portland cement with the strength grade of 42.5, 40 parts by weight of micro-silica powder with the particle size of 4-8 microns, 120 parts by weight of fly ash with the particle size of 345-390 microns, 40 parts by weight of mineral powder with the particle size of 800-1000 microns, 246 parts by weight of quartz sand with the particle size of 0.08-0.20 mm, 106 parts by weight of carborundum with the particle size of 0.15-0.30 m and 8 parts by weight of polypropylene fiber with the length of 17mm to obtain a mixed material; mixing 6 parts by weight of a polycarboxylate water reducer SUNBO PC1021 type, 2 parts by weight of hydroxypropyl methyl cellulose ether HEDA HP400 type and 125 parts by weight of water (the mass ratio of the water reducer to the cellulose ether to the water is 6: 2: 125) to obtain mixed slurry;
(2) pre-mixing the obtained mixed material in a stirring pot for 180 s; then adding the obtained mixed slurry into the pre-stirred mixed material at a constant speed within 15s, and stirring for 300 s; and finally, pouring 32 parts of steel fibers with the diameter of 0.5mm, the length of 12mm and the tensile strength into a stirring pot uniformly within 15s, and stirring for 15min to obtain the 3D printing tough concrete material.
(3) 3D printing is carried out on the concrete material, the diameter of a printing nozzle is set to be 20mm, and the basic speed of printing parameters of printing equipment is set to be 0.25m3H, horizontal printing speed ofAnd 12m/min, and then printing to obtain the 3D printing toughened concrete. The mechanical properties of the alloy are tested, and the results are shown in Table 1.
Example 2
(1) Mixing 400 parts by weight of ordinary portland cement with the strength grade of 52.5, 40 parts by weight of micro-silica powder with the particle size of 4-8 microns, 120 parts by weight of fly ash with the particle size of 345-390 microns, 40 parts by weight of mineral powder with the particle size of 800-1000 microns, 246 parts by weight of quartz sand with the particle size of 0.08-0.20 mm, 106 parts by weight of carborundum with the particle size of 0.15-0.30 m and 8 parts by weight of polypropylene fiber with the length of 17mm to obtain a mixed material; mixing 6 parts by weight of a polycarboxylate water reducer SUNBO PC1021 type, 2 parts by weight of hydroxypropyl methyl cellulose ether HEDA HP400 type and 125 parts by weight of water (the mass ratio of the water reducer to the cellulose ether to the water is 6: 2: 125) to obtain mixed slurry;
(2) pre-mixing the obtained mixed material in a stirring pot for 180 s; then adding the obtained mixed slurry into the pre-stirred mixed material at a constant speed within 15s, and stirring for 300 s; and finally, pouring 32 parts of steel fibers with the diameter of 0.5mm, the length of 12mm and the tensile strength into a stirring pot uniformly within 15s, and stirring for 15min to obtain the 3D printing tough concrete material.
(3) 3D printing is carried out on the concrete material, the diameter of a printing nozzle is set to be 20mm, and the basic speed of printing parameters of printing equipment is set to be 0.25m3And h, horizontally printing at the speed of 12m/min, and then printing to obtain the 3D printing toughened concrete. The mechanical properties of the alloy are tested, and the results are shown in Table 1.
Example 3
(1) Mixing 400 parts by weight of ordinary Portland cement with the strength grade of 42.5, 40 parts by weight of micro-silica powder with the particle size of 4-8 microns, 120 parts by weight of fly ash with the particle size of 345-390 microns, 40 parts by weight of mineral powder with the particle size of 800-1000 microns, 246 parts by weight of quartz sand with the particle size of 0.08-0.20 mm, 106 parts by weight of carborundum with the particle size of 0.15-0.30 m and 8 parts by weight of polypropylene fiber with the length of 17mm to obtain a mixed material; mixing 6 parts by weight of a polycarboxylate water reducer SUNBO PC1021 type, 2 parts by weight of hydroxypropyl methyl cellulose ether HEDA HP400 type and 125 parts by weight of water (the mass ratio of the water reducer to the cellulose ether to the water is 6: 2: 125) to obtain mixed slurry;
(2) pre-mixing the obtained mixed material in a stirring pot for 180 s; then adding the obtained mixed slurry into the pre-stirred mixed material at a constant speed within 15s, and stirring for 300 s; and finally, uniformly pouring 40 parts of steel fibers with the diameter of 0.5mm, the length of 12mm and the tensile strength into a stirring pot within 15s, and stirring for 15min to obtain the 3D printing tough concrete material.
(3) 3D printing is carried out on the concrete material, the diameter of a printing nozzle is set to be 20mm, and the basic speed of printing parameters of printing equipment is set to be 0.25m3And h, horizontally printing at the speed of 12m/min, and then printing to obtain the 3D printing toughened concrete. The mechanical properties of the alloy are tested, and the results are shown in Table 1.
Comparative example 1
(1) Mixing 400 parts by weight of ordinary Portland cement with the strength grade of 42.5, 40 parts by weight of micro-silica powder with the particle size of 4-8 microns, 120 parts by weight of fly ash with the particle size of 345-390 microns, 40 parts by weight of mineral powder with the particle size of 800-1000 microns, 246 parts by weight of quartz sand with the particle size of 0.08-0.20 mm and 106 parts by weight of carborundum with the particle size of 0.15-0.30 m to obtain a mixed material; mixing 6 parts by weight of a polycarboxylate water reducer SUNBO PC1021 type, 2 parts by weight of hydroxypropyl methyl cellulose ether HEDA HP400 type and 125 parts by weight of water (the mass ratio of the water reducer to the cellulose ether to the water is 6: 2: 125) to obtain mixed slurry;
(2) pre-mixing the obtained mixed material in a stirring pot for 180 s; and then adding the obtained mixed slurry into the pre-stirred mixed material at a constant speed within 15s, and stirring for 300s to obtain the 3D printing flexible concrete material.
(3) 3D printing is carried out on the concrete material, the diameter of a printing nozzle is set to be 20mm, and the basic speed of printing parameters of printing equipment is set to be 0.25m3And h, horizontally printing at the speed of 12m/min, and then printing to obtain the 3D printing toughened concrete. The mechanical properties of the alloy are tested, and the results are shown in Table 1.
TABLE 13D mechanical property measurements of the printed tough concretes
From the results in table 1, it can be seen that the concrete of the present invention exhibits excellent properties in terms of properties such as compressive strength, tensile strength and tensile strain. Compared with the concrete of comparative example 1, the 3D printed concrete (examples 1 to 3) of the present invention has significantly better properties in compressive strength, tensile strain, etc., than the concrete obtained without the addition of steel fibers and polypropylene fibers. Therefore, the fiber can improve the impermeability of concrete and improve the structural integrity, ductility and seismic and energy consumption resistance. The concrete can obviously reduce the consumption of 3D printing concrete materials and reduce the cost.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. The 3D printing tough concrete material is characterized by comprising the following components in percentage by weight:
2. the 3D printed flexible concrete material according to claim 1, wherein the type of the cement is ordinary portland cement PO 42.5 or PO 52.5.
3. The 3D printed flexible concrete material according to claim 1, wherein the mineral admixture is mainly composed of the following raw materials in percentage by weight: 15-25% of micro silicon powder, 40-60% of fly ash and 8-20% of mineral powder; wherein, the silicon dioxide in the micro silicon powder is more than or equal to 90 percent; the fly ash is I-grade ash; the mineral powder is S95 grade, and the fineness of the mineral powder is more than or equal to 800 meshes.
4. The 3D printed flexible concrete material according to claim 1, wherein the fibers are mainly composed of the following raw materials in percentage by weight: 60-80% of steel fiber and 20-40% of polypropylene fiber; wherein the steel fiber is a copper-plated micro-wire with an end hook, the length of the steel fiber is 12mm, and the diameter of the steel fiber is 0.5 mm; the length of the polypropylene fiber is 12-19 mm.
5. The 3D printed flexible concrete material according to claim 1, wherein the fine aggregate is mainly composed of the following raw materials by weight percent: 60-80% of quartz sand and 20-40% of carborundum; the quartz sand is the sand in the second area, the fineness modulus is 2.6-2.9, and the grain size of the carborundum is less than or equal to 4.75 mm.
6. The 3D printed flexible concrete material according to claim 1, wherein the superplasticizer consists essentially of the following raw materials in weight percent: 65-80% of a polycarboxylic acid water reducing agent and 15-25% of hydroxypropyl methyl cellulose ether; the polycarboxylate superplasticizer is a polyether high-dewatering type, and the viscosity of the hydroxypropyl methyl cellulose ether is 400Pa & s.
7. A preparation method of a 3D printing tough concrete material comprises the following steps:
(1) weighing and mixing cement, micro silicon powder, fly ash, mineral powder, quartz sand, carborundum and polypropylene fiber according to a ratio to obtain a mixture;
weighing and mixing a polycarboxylic acid water reducing agent, hydroxypropyl methyl cellulose ether and water according to a ratio to obtain mixed slurry;
(2) and pre-stirring the mixed material, adding the mixed slurry, stirring, adding the steel fiber, and continuously stirring uniformly to obtain the 3D printing tough concrete dry mixed material.
8. The preparation method of claim 7, wherein the mass ratio of the polycarboxylic acid water reducer to the hydroxypropyl methyl cellulose ether to the water is 6: 2: 125.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113173756A (en) * | 2021-04-26 | 2021-07-27 | 天津城建大学 | High-temperature-resistant 3D printing fiber concrete with steel slag waste as aggregate and preparation method thereof |
| CN117623713A (en) * | 2023-11-27 | 2024-03-01 | 华润水泥技术研发有限公司 | Concrete for 3D printing and preparation method and application thereof |
| CN118791274A (en) * | 2024-09-13 | 2024-10-18 | 河北量子智能科技有限公司 | A mortar material and its preparation method and application |
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