CN112321188A - Special additive for concrete for 3D printing and concrete thereof - Google Patents
Special additive for concrete for 3D printing and concrete thereof Download PDFInfo
- Publication number
- CN112321188A CN112321188A CN202011221111.7A CN202011221111A CN112321188A CN 112321188 A CN112321188 A CN 112321188A CN 202011221111 A CN202011221111 A CN 202011221111A CN 112321188 A CN112321188 A CN 112321188A
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- concrete
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- printing
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- kaolin calcined
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
- B33Y70/10—Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Civil Engineering (AREA)
- Composite Materials (AREA)
- Manufacturing & Machinery (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a special additive for 3D printing concrete and concrete thereof, and provides the special additive for 3D printing concrete and the concrete using the special additive, so that the 3D printing concrete has good fluidity during 3D printing construction, and can lose fluidity and even plasticity in a relatively short time after construction is finished, and the setting time of the concrete is properly reduced. The special additive is prepared from kaolin calcined tailings, anhydrous sodium sulfate and triethanolamine, and comprises the following components in percentage by mass: 97-99% of kaolin calcined tailings, 1-2% of anhydrous sodium sulfate and 0.1-1% of triethanolamine. The invention is suitable for 3D printing building construction.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of building materials, in particular to a concrete special additive for 3D printing and concrete thereof.
[ background of the invention ]
Compared with the traditional construction process, the 3D printing of the building has the advantages of digital informatization accurate construction, standardized automatic construction of machine equipment, simplified construction process and the like. Therefore, the development of 3D printing construction technology meets the requirements of building industrialization, and is one of the future development directions of the building industry.
In order to satisfy the pumpability, the conventional concrete material must have sufficient fluidity and low plastic viscosity and yield strength. In order to achieve layer-by-layer printing of concrete, the fluidity of the concrete must be reduced so that the concrete has high yield strength and plastic viscosity. The requirements of 3D printing construction on materials are more strict than that of common concrete in traditional construction, and the printing materials need to have good strength and rigidity and good crack resistance and plasticity. The building 3D printing material needs to meet the following material properties: (1) extrudability and better flowability; (2) a controllable setting time; (3) good stacking property and high interlayer connection property; (4) high strength.
The concrete for 3D printing needs to be prepared by centralized mixing in a concrete mixing plant and transported to a construction site by adopting a concrete transport vehicle, a certain time is needed, in order to ensure the relevant performance of the concrete and ensure that the concrete can be transported, the concrete must have larger fluidity, namely, the concrete needs larger slump and longer slump retaining capacity, in order to meet the requirements of layer-by-layer printing and construction speed and ensure the mechanical and other performances of hardened concrete, the concrete is required to have faster performance of losing fluidity and plasticity after being printed, controllable setting time and higher early strength are ensured, and the two have larger contradiction and are not controlled by a mature technology at present.
The present invention has been made based on such a situation.
[ summary of the invention ]
The invention aims to overcome the defects of the prior art, and provides the special additive for the 3D printing concrete and the concrete using the special additive, so that the 3D printing concrete has good fluidity during 3D printing construction, the fluidity and even the plasticity can be lost in a relatively short time after the construction is finished, and the setting time of the concrete is properly reduced.
The invention is realized by the following technical scheme:
the special additive for the concrete for 3D printing is prepared from kaolin calcined tailings, anhydrous sodium sulfate and triethanolamine, and comprises the following components in percentage by mass: 97-99% of kaolin calcined tailings, 1-2% of anhydrous sodium sulfate and 0.1-1% of triethanolamine.
The special additive for the concrete for 3D printing comprises the following components in percentage by mass: 97.5-98.75% of kaolin calcined tailings, 1-2% of anhydrous sodium sulfate and 0.25-0.5% of triethanolamine.
The additive special for the concrete for 3D printing is characterized in that the kaolin calcined tailings meet the following requirements: the fineness is less than or equal to 5 percent, the loss on ignition is less than or equal to 4 percent, the content of free calcium oxide is less than or equal to 1 percent, and the 28-day activity index of the concrete with the mixing amount of 30 percent of kaolin calcined tailings is more than or equal to 90 percent.
The invention can also be realized by the following technical scheme:
the concrete for 3D printing comprises the special additive, and further comprises a cementing material, sand, broken stone, a water reducing agent and water.
The concrete for 3D printing comprises cement, slag powder and fly ash, wherein the sand is continuous graded sand with fineness modulus of 2.5, the broken stone is granite broken stone with thickness of 5-10 mm, and the water reducing agent is a polycarboxylic acid high-performance water reducing agent.
The concrete for 3D printing comprises the following components in parts by weight: 225-355 parts of cement, 70-105 parts of slag powder, 95-120 parts of fly ash, 675-760 parts of sand, 975-995 parts of granite macadam, 8-16 parts of polycarboxylic acid high-performance water reducing agent and 145-175 parts of water, wherein the mass parts of the special additive account for 4-6% of the mass parts of the cementing material.
According to the concrete for 3D printing, the mass part of the special additive accounts for 5.1% of that of the cementing material.
Compared with the prior art, the invention has the following advantages:
the invention relates to a concrete special additive for 3D printing, which can be used for adjusting the working performance of concrete for 3D printing of buildings, the special additive is added into the concrete through a secondary stirring technology during 3D printing construction so as to realize that the 3D printing concrete has good fluidity during 3D printing construction, and the fluidity and even plasticity can be lost in a relatively short time after the construction is finished, so that the concrete setting time is properly reduced.
The invention also relates to 3D printing concrete which uses the special additive and has the advantages of low slump, short hardening time, high compressive strength and the like.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
The first embodiment is as follows:
the special additive for the concrete for 3D printing is prepared from kaolin calcined tailings, anhydrous sodium sulfate and triethanolamine, and comprises the following components in percentage by mass: 97.5-98.75% of kaolin calcined tailings, 1-2% of anhydrous sodium sulfate and 0.25-0.5% of triethanolamine. The concrete for 3D printing added with the special additive can realize good fluidity during 3D printing construction, and can lose fluidity and even plasticity in a relatively short time after construction is finished, thereby properly reducing the setting time of the concrete.
Specifically, the kaolin calcined tailings meet the following requirements: the fineness is less than or equal to 5 percent, the loss on ignition is less than or equal to 4 percent, the content of free calcium oxide is less than or equal to 1 percent, and the 28-day activity index of the concrete with the mixing amount of 30 percent of kaolin calcined tailings is more than or equal to 90 percent. Preferably, the kaolin calcined tailings are low-quality kaolin calcined tailings.
Specifically, the kaolin calcined tailings are similar to cement clinker, the amount of the cement coagulation regulator added into the concrete is equivalent to that of the cement coagulation regulator in the system, and the setting time of the concrete can be shortened by using the special additive of the kaolin calcined tailings. Moreover, the kaolin calcined tailings have strong adsorbability, can adsorb common concrete additives and water, play a role in reducing the content of free water and the common additives in the concrete, can greatly reduce the slump of the concrete, can make the concrete lose fluidity in a short time by using the special additives of the kaolin calcined tailings, and shorten the setting time of the concrete. In addition, the low-quality kaolin calcined tailings have higher chemical activity, so that the special additive can properly improve the strength of concrete.
Specifically, the anhydrous sodium sulfate has a chemical formula of Na2SO4The anhydrous sodium sulfate can be used as an inorganic concrete early strength agent, can promote the hydration of cement and low-quality kaolin calcined tailings, and can excite the chemical activity, and the special additive using the anhydrous sodium sulfate can improve the early strength of concrete. Meanwhile, the fluidity loss of the concrete is increased, and the setting time is shortened.
Specifically, the chemical formula of triethanolamine is (HOCH)2CH2)3The triethanolamine can be used as an organic concrete early strength agent, can promote the hydration of cement and low-quality kaolin calcined tailings, and can stimulate chemical activity, and the special additive using the triethanolamine can improve the early strength of concrete. Meanwhile, the fluidity loss of the concrete is increased, and the setting time is shortened.
Example two:
the concrete for 3D printing comprises the special additive, and further comprises a cementing material, sand, broken stone, a water reducing agent and water.
Specifically, the cementing material comprises cement, slag powder and fly ash, the sand is continuous graded sand with a fineness modulus of 2.5, the broken stone is granite broken stone with a thickness of 5 mm-10 mm, the water reducing agent is a polycarboxylic acid high-performance water reducing agent, and the water is tap water.
Specifically, the concrete comprises the following components in parts by weight: 230 parts of cement, 75 parts of slag powder, 110 parts of fly ash, 755 parts of sand, 990 parts of granite broken stone, 9 parts of polycarboxylic acid high-performance water reducing agent and 170 parts of water, wherein the mass part of the special additive accounts for 5.1% of that of the cementing material.
Example three:
the concrete for 3D printing is different from the second embodiment in that: the concrete comprises the following components in parts by weight: 280 parts of cement, 90 parts of slag powder, 115 parts of fly ash, 725 parts of sand, 980 parts of granite broken stone, 11 parts of polycarboxylic acid high-performance water reducing agent and 160 parts of water, wherein the mass part of the special additive accounts for 5.1% of the mass part of the cementing material.
Example four:
the concrete for 3D printing is different from the second embodiment in that: the concrete comprises the following components in parts by weight: 350 parts of cement, 100 parts of slag powder, 100 parts of fly ash, 680 parts of sand, 980 parts of granite broken stone, 15 parts of polycarboxylic acid high-performance water reducing agent and 150 parts of water, wherein the mass part of the special additive accounts for 5.1% of the mass part of the cementing material.
The effects of the present invention are illustrated by experimental data, wherein the numbers 1, 2, and 3 in Table 1 are data measured by using concrete of examples II, III, and IV, respectively, without adding a special admixture; the numbers 4, 5 and 6 in Table 2 represent data obtained by using the concrete of examples two, three and four, respectively.
Table 1:
table 2:
table 2 continues the table:
as can be seen by comparing the data in the table: the special additive of the invention is added, so that the slump constant can be obviously reduced, the hardening time can be reduced, and in addition, the concrete using the special additive has higher compressive strength.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (7)
1. The utility model provides a special admixture of concrete for 3D prints which characterized in that: the kaolin calcined tailing is prepared from kaolin calcined tailing, anhydrous sodium sulfate and triethanolamine, and the components in percentage by mass are as follows: 97-99% of kaolin calcined tailings, 1-2% of anhydrous sodium sulfate and 0.1-1% of triethanolamine.
2. The admixture special for the concrete for 3D printing according to claim 1, which is characterized in that: the special additive comprises the following components in percentage by mass: 97.5-98.75% of kaolin calcined tailings, 1-2% of anhydrous sodium sulfate and 0.25-0.5% of triethanolamine.
3. The admixture special for the concrete for 3D printing according to claim 2, wherein: the kaolin calcined tailings meet the following requirements: the fineness is less than or equal to 5 percent, the loss on ignition is less than or equal to 4 percent, the content of free calcium oxide is less than or equal to 1 percent, and the 28-day activity index of the concrete with the mixing amount of 30 percent of kaolin calcined tailings is more than or equal to 90 percent.
4. The utility model provides a 3D prints and uses concrete which characterized in that: the special admixture for concrete comprises any one of claims 1 to 3, wherein the concrete further comprises a cementing material, sand, gravel, a water reducing agent and water.
5. The concrete for 3D printing according to claim 4, wherein: the cementing material comprises cement, slag powder and fly ash, the sand is continuous graded sand, the fineness modulus of the sand is 2.5, the broken stone is granite broken stone with the thickness of 5-10 mm, and the water reducing agent is a polycarboxylic acid high-performance water reducing agent.
6. The concrete for 3D printing according to claim 5, wherein: the concrete comprises the following components in parts by weight: 225-355 parts of cement, 70-105 parts of slag powder, 95-120 parts of fly ash, 675-760 parts of sand, 975-995 parts of granite macadam, 8-16 parts of polycarboxylic acid high-performance water reducing agent and 145-175 parts of water, wherein the mass parts of the special additive account for 4-6% of the mass parts of the cementing material.
7. The concrete for 3D printing according to claim 6, wherein: the mass portion of the special additive accounts for 5.1% of that of the cementing material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011221111.7A CN112321188B (en) | 2020-11-05 | 2020-11-05 | Special additive for concrete for 3D printing and concrete thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011221111.7A CN112321188B (en) | 2020-11-05 | 2020-11-05 | Special additive for concrete for 3D printing and concrete thereof |
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| Publication Number | Publication Date |
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| CN112321188A true CN112321188A (en) | 2021-02-05 |
| CN112321188B CN112321188B (en) | 2022-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011221111.7A Active CN112321188B (en) | 2020-11-05 | 2020-11-05 | Special additive for concrete for 3D printing and concrete thereof |
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Citations (5)
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|---|---|---|---|---|
| US20050059757A1 (en) * | 2003-08-29 | 2005-03-17 | Z Corporation | Absorbent fillers for three-dimensional printing |
| CN108249847A (en) * | 2017-12-25 | 2018-07-06 | 芜湖林电子科技有限公司 | A kind of 3D printing mortar of high compressive strength |
| CN109057078A (en) * | 2018-09-06 | 2018-12-21 | 江苏建筑职业技术学院 | A kind of method of 3D printing building heat preservation sound-insulation wall |
| WO2019237970A1 (en) * | 2018-06-12 | 2019-12-19 | 中铁四局集团有限公司 | Highly thixotropic 3d printing concrete and manufacturing method therefor |
| CN111302709A (en) * | 2020-02-28 | 2020-06-19 | 中国建筑材料科学研究总院有限公司 | Alkali-activated cementing material for 3D printing and printing method thereof |
-
2020
- 2020-11-05 CN CN202011221111.7A patent/CN112321188B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050059757A1 (en) * | 2003-08-29 | 2005-03-17 | Z Corporation | Absorbent fillers for three-dimensional printing |
| CN108249847A (en) * | 2017-12-25 | 2018-07-06 | 芜湖林电子科技有限公司 | A kind of 3D printing mortar of high compressive strength |
| WO2019237970A1 (en) * | 2018-06-12 | 2019-12-19 | 中铁四局集团有限公司 | Highly thixotropic 3d printing concrete and manufacturing method therefor |
| CN109057078A (en) * | 2018-09-06 | 2018-12-21 | 江苏建筑职业技术学院 | A kind of method of 3D printing building heat preservation sound-insulation wall |
| CN111302709A (en) * | 2020-02-28 | 2020-06-19 | 中国建筑材料科学研究总院有限公司 | Alkali-activated cementing material for 3D printing and printing method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 魏德洲主编: "《固体物料分选学》", 31 August 2015, 冶金工业出版社 * |
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