CN115010445A - 3D printing Portland cement concrete and preparation method thereof - Google Patents

3D printing Portland cement concrete and preparation method thereof Download PDF

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Publication number
CN115010445A
CN115010445A CN202210845619.7A CN202210845619A CN115010445A CN 115010445 A CN115010445 A CN 115010445A CN 202210845619 A CN202210845619 A CN 202210845619A CN 115010445 A CN115010445 A CN 115010445A
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percent
portland cement
acid
concrete
water
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邢凯
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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
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/04—Silica-rich materials; Silicates
    • C04B14/042—Magnesium silicates, e.g. talc, sepiolite
    • 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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24—Macromolecular compounds
    • C04B24/38—Polysaccharides or derivatives thereof
    • C04B24/383—Cellulose or derivatives thereof
    • 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
    • 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

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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)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention discloses a 3D printing Portland cement concrete and a preparation method thereof, wherein the concrete comprises Portland cement, river sand, carboxymethyl cellulose ether, sepiolite powder, polycarboxylic acid water reducing agent and Na 2 SO 4 Citric acid, tartaric acid, boric acid, polypropylene microfiber, CSA and silicon powder, wherein the dosage of each component is as follows: 48 percent of Portland cement, 50 percent of river sand, 0.075 percent of carboxymethyl cellulose ether, 0.25 percent of sepiolite powder, 0.1 percent of polycarboxylic acid water reducing agent and Na 2 SO 4 0.1 percent of citric acid, 0.075 percent of tartaric acid, 0.065 percent of boric acid, 0.01 percent of polypropylene microfiber, 0.05 percent of CSA2 percent, 2 percent of silicon powder and the balance of water; wherein the water-cement ratio is 0.35. The concrete and the preparation method can reduce the dosage of the additive, improve the use efficiency of the additive, enhance the beneficial rheological property of the material and stabilize the material in the ringThe hydration time is effectively controlled under the influence of environmental change.

Description

3D printing Portland cement concrete and preparation method thereof
Technical Field
The invention belongs to the technical field of 3D printing, and particularly relates to 3D printing Portland cement concrete and a preparation method thereof.
Background
The performances of concrete materials in different areas can be completely different, and the special 3D concrete printing material meeting the printing requirements is very difficult to manufacture aiming at the raw materials which can be purchased in different areas.
For example, patent application 201710879265.7 discloses a 3D concrete printing material and process thereof, which is incorporated with steel fibers to replace the steel bars in the reinforced concrete for general use, thereby increasing the tensile strength of the 3D printed concrete and the bending, shearing and torsion strengths mainly controlled by the main tensile stress, and using crushed stones with a diameter of 8mm can improve the compression resistance of the 3D printed concrete. For another example, patent application 202111268243.X discloses a 3D concrete material for printing, which comprises the following components in percentage by weight: 20-30% of Portland cement, 12-16% of sulphoaluminate cement, 6-8% of compound fiber, 10-20% of mineral admixture, 20-40% of compound fine aggregate, 0.5-1% of water reducing agent, 0-1% of accelerating agent, 1-2% of cellulose ether and 10-12% of water. The 3D printing concrete material disclosed by the application adjusts the formula of the cementing material, uses Portland cement and sulphoaluminate cement with early strength characteristic as the cementing material, can adjust the early hydration speed and the early strength of the concrete, and has the effect of quick setting.
However, for the united states, the price of the existing products in the current market of the printing concrete is very high, and the strength of the existing materials is low, so that a hardening agent needs to be added to increase the strength of the materials, which in turn increases the cost of the products and promotes the price of the products to be increased.
As a building material, concrete for 3D printing is extremely high in material cost due to the cost of its additives. Meanwhile, the early strength and hydration time of the material need to be accurately controlled in terms of performance requirements. This results in a relatively small amount of material being able to meet the requirements. Too rapid hydration of the material before it is ejected can lead to printer clogging and significant losses. Too slow hydration of the material can result in the printed material failing to support subsequent material and collapsing. The difference in cohesion within the material can result in the material not being able to retain its morphology. And a conflict relationship exists among a plurality of performances, and a more reliable solution is needed. For example, increasing the cohesion of a material by adding thickening can have a severe effect on hydration time, while controlling hydration time by adding an excess amount of retarder can have an effect on strength and cohesion. Therefore, the existing 3D printing concrete material has the problems of high price, poor stability, poor strength performance and poor rheological mechanical property.
Disclosure of Invention
In order to solve the problems of high price, poor stability, poor strength performance and poor rheological mechanical property, the invention mainly aims to provide the 3D printing Portland cement concrete and the preparation method thereof.
Another object of the present invention is to provide a 3D printed portland cement concrete and a method for preparing the same, which can achieve overhanging printing without adding a hardening agent.
In order to achieve the above object, the technical solution of the present invention is as follows.
The 3D printing Portland cement concrete comprises Portland cement, river sand, carboxymethyl cellulose ether, sepiolite powder, a polycarboxylic acid water reducing agent and Na 2 SO 4 The composite material comprises citric acid, tartaric acid, boric acid, polypropylene microfiber, CSA and silicon powder, wherein the components are used in parts by weight: 48 parts of Portland cement, 50 parts of river sand, 0.075 part of carboxymethyl cellulose ether, 0.25 part of sepiolite powder, 0.1 part of polycarboxylic acid water reducing agent and Na 2 SO 4 0.05-0.1 part of citric acid, 0.075 part of tartaric acid, 0.065 part of boric acid, 0.001-0.01 part of polypropylene microfiber, 0.05 part of CSA2 part of silicon powder and the balance of water; wherein the water-cement ratio is 0.35.
Wherein the portland cement is produced in Mexico.
The river sand is bulk river sand of Vallun (Valcun).
The polypropylene microfibers had a length of 6 mm.
A preparation method of 3D printing Portland cement concrete comprises the steps of putting sepiolite powder, carboxymethyl cellulose ether, all retarders, water reducers and early strength agents into water, stirring for 1 minute by using a high shear mixer (emulsifying machine) to prepare a pre-emulsion, and mixing the pre-emulsion with sand, concrete and silicon powder to obtain the concrete material.
Further, the working temperature is 20 to 30 ℃.
Further, the blending time required was more than 4 minutes.
The invention firstly mixes the sepiolite powder with the carboxymethyl cellulose ether, all the retarders, the water reducing agent and the early strength agent, stirs to prepare the pre-emulsion, and uses the pre-emulsion to mix with the sand, the concrete and the silicon powder, the prepared concrete can be obtained by adding the pre-emulsion, so that the dosage of the additive is less, the rheological property (cantilever property) of the prepared material is good, the early strength property of the material is high, the influence of the material under the environmental change is stabilized, the hydration time is effectively controlled, and the small objects can be printed at high speed.
Meanwhile, the concrete material can realize overhanging printing under the condition of not adding a hardening agent.
Detailed Description
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 specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The additives adopted by the invention are purchased in the American market.
Example 1.
The Portland cement concrete for 3D printing realized by the invention comprises Portland cement, river sand, carboxymethyl cellulose ether, sepiolite powder, polycarboxylic acid water reducing agent and Na 2 SO 4 Citric acid, tartaric acid, boric acid, polypropylene microfiber, CSA and silicon powder, wherein the dosage of each component is as follows: in 2kg of material in the United states, 960g of Portland cement commonly produced in Mexico, 1000g of sand in Valcun bulk river sand, 1.5g of carboxymethyl cellulose ether, 5g of sepiolite powder, 2g of polycarboxylic acid water reducer, Na 2 SO 4 2g, 1.5g of citric acid, 1.3g of tartaric acid, 0.2g of boric acid, 6mm and 1g of polypropylene microfiber, 40g of CSA and 40g of silicon powder, wherein the water-cement ratio is 0.35.
The preparation method of the Portland cement concrete for 3D printing comprises the steps of putting sepiolite powder, carboxymethyl cellulose ether, all retarders, water reducers and early strength agents into water, stirring for 1 minute by using a high shear mixer (emulsifying machine) to prepare a pre-emulsion, and mixing the pre-emulsion with sand, concrete and silicon powder for more than 4 minutes.
The working temperature is 20-30 ℃.
Example 2.
The Portland cement concrete for 3D printing realized by the invention comprises Portland cement, river sand, carboxymethyl cellulose ether, sepiolite powder, polycarboxylic acid water reducing agent and Na 2 SO 4 Citric acid, tartaric acid, boric acid, polypropylene microfiber, CSA and silicon powder, wherein the dosage of each component is as follows: in 2kg of material in the United states, 960g of Portland cement commonly produced in Mexico, 1000g of sand in Valcun bulk river sand, 1.5g of carboxymethyl cellulose ether, 5g of sepiolite powder, 2g of polycarboxylic acid water reducer, Na 2 SO 4 1g, 1.5g of citric acid, 1.3g of tartaric acid, 0.01g of boric acid, 6mm of polypropylene microfiber 1g, 40g of CSA, 40g of silicon powder and 0.35 of water-cement ratio.
The preparation method of the 3D printing Portland cement concrete comprises the steps of putting sepiolite powder, carboxymethyl cellulose ether, all retarders, water reducers and early strength agents into water, stirring for 1 minute by using a high-shear stirrer (an emulsifying machine) to prepare a pre-emulsion, and mixing the pre-emulsion with sand, concrete and silica powder for more than 4 minutes.
The working temperature is 20-30 ℃.
Example 3.
The Portland cement concrete for 3D printing realized by the invention comprises Portland cement, river sand, carboxymethyl cellulose ether, sepiolite powder, polycarboxylic acid water reducing agent and Na 2 SO 4 Citric acid, tartaric acid, boric acid, polypropylene microfiber, CSA and silicon powder, wherein the dosage of each component is as follows: in 2kg of material in the United states, 960g of Portland cement commonly produced in Mexico, 1000g of sand in Valcun bulk river sand, 1.5g of carboxymethyl cellulose ether, 5g of sepiolite powder, 2g of polycarboxylic acid water reducer, Na 2 SO 4 1.2g, 1.5g of citric acid, 1.3g of tartaric acid, 0.1g of boric acid, 6mm of polypropylene microfiber, 1g of CSA, 40g of silicon powder and 0.35 of water-cement ratio.
The preparation method of the 3D printing Portland cement concrete comprises the steps of putting sepiolite powder, carboxymethyl cellulose ether, all retarders, water reducers and early strength agents into water, stirring for 1 minute by using a high-shear stirrer (an emulsifying machine) to prepare a pre-emulsion, and mixing the pre-emulsion with sand, concrete and silica powder for more than 4 minutes.
The working temperature is 20-30 ℃.
Example 4.
The Portland cement concrete for 3D printing realized by the invention comprises Portland cement, river sand, carboxymethyl cellulose ether, sepiolite powder, polycarboxylic acid water reducing agent and Na 2 SO 4 Citric acid, tartaric acid, boric acid, polypropylene microfiber, CSA and silicon powder, wherein the dosage of each component is as follows: in 2kg of material in the United states, 960g of Portland cement commonly produced in Mexico, 1000g of sand in Valcun bulk river sand, 1.5g of carboxymethyl cellulose ether, 5g of sepiolite powder, 2g of polycarboxylic acid water reducer, Na 2 SO 4 1.6g, 1.5g of citric acid, 1.3g of tartaric acid, 0.15g of boric acid, 6mm of polypropylene microfiber 1g, 40g of CSA, 40g of silicon powder and 0.35 of water-cement ratio.
The preparation method of the Portland cement concrete for 3D printing comprises the steps of putting sepiolite powder, carboxymethyl cellulose ether, all retarders, water reducers and early strength agents into water, stirring for 1 minute by using a high shear mixer (emulsifying machine) to prepare a pre-emulsion, and mixing the pre-emulsion with sand, concrete and silicon powder for more than 4 minutes.
The working temperature is 20-30 ℃.
In a word, the sepiolite powder, the carboxymethyl cellulose ether, all the retarders and the water reducing agent are stirred to prepare the pre-emulsion, and then the pre-emulsion is mixed with sand, concrete and silicon powder to obtain the sepiolite/carboxymethyl cellulose composite material.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. The 3D printing Portland cement concrete is characterized by comprising Portland cement, river sand, carboxymethyl cellulose ether, sepiolite powder, polycarboxylic acid water reducing agent and Na 2 SO 4 Citric acid, tartaric acid, boric acid, polypropylene microfiber, CSA and silicon powder, wherein the dosage of each component is as follows: 48 percent of Portland cement, 50 percent of river sand, 0.075 percent of carboxymethyl cellulose ether, 0.25 percent of sepiolite powder, 0.1 percent of polycarboxylic acid water reducing agent and Na 2 SO 4 0.1 percent of citric acid, 0.075 percent of tartaric acid, 0.065 percent of boric acid, 0.01 percent of polypropylene microfiber, 0.05 percent of CSA2 percent, 2 percent of silicon powder and the balance of water; wherein the water-cement ratio is 0.35.
2. 3D-printed portland cement concrete according to claim 1, wherein the portland cement is produced by mexico.
3. The 3D printed portland cement concrete of claim 1, wherein the river sand is waltzian bulk river sand.
4. The 3D printed portland cement concrete according to claim 1, wherein the polypropylene microfibers have a length of 6 mm.
5. A preparation method of 3D printing Portland cement concrete is characterized in that sepiolite powder, carboxymethyl cellulose ether, a polycarboxylate superplasticizer and Na 2 SO 4 Adding citric acid, tartaric acid, boric acid, polypropylene microfiber and CSA into water, stirring for 1 minute by using a high shear mixer to prepare a pre-emulsion, and mixing the pre-emulsion with sand, Portland cement and silicon powder to obtain the concrete material.
6. The method of preparing 3D printed portland cement concrete according to claim 5, wherein the mixing and blending is performed at a temperature of 20 to 30 degrees celsius.
7. The method of preparing a 3D printed portland cement concrete according to claim 6, wherein the mixing time is more than 4 minutes.
CN202210845619.7A 2022-07-19 2022-07-19 3D printing Portland cement concrete and preparation method thereof Pending CN115010445A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100782044B1 (en) * 2007-04-03 2007-12-04 (주)국민산업 High on the strength seal inorganic polymer mortar and it's manufacture method with cross sectional repair of a reinforcement concrete structure old part, and the class formation for waterproofing
CN104788045A (en) * 2014-01-18 2015-07-22 上海标仕新型建筑材料厂 Grouting material
CN107500687A (en) * 2017-10-19 2017-12-22 万玉君 A kind of high ductility fiber reinforced cement-based composite material for 3D printing and preparation method thereof
CN107963839A (en) * 2017-09-26 2018-04-27 芜湖天梦信息科技有限公司 A kind of 3D concrete printing raw material and its technique
CN114163201A (en) * 2021-10-29 2022-03-11 南京绿色增材智造研究院有限公司 3D concrete material for printing

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100782044B1 (en) * 2007-04-03 2007-12-04 (주)국민산업 High on the strength seal inorganic polymer mortar and it's manufacture method with cross sectional repair of a reinforcement concrete structure old part, and the class formation for waterproofing
CN104788045A (en) * 2014-01-18 2015-07-22 上海标仕新型建筑材料厂 Grouting material
CN107963839A (en) * 2017-09-26 2018-04-27 芜湖天梦信息科技有限公司 A kind of 3D concrete printing raw material and its technique
CN107500687A (en) * 2017-10-19 2017-12-22 万玉君 A kind of high ductility fiber reinforced cement-based composite material for 3D printing and preparation method thereof
CN114163201A (en) * 2021-10-29 2022-03-11 南京绿色增材智造研究院有限公司 3D concrete material for printing

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