CN115594469A - Low-drying-shrinkage 3D printing concrete and preparation method thereof - Google Patents
Low-drying-shrinkage 3D printing concrete and preparation method thereof Download PDFInfo
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- 238000010146 3D printing Methods 0.000 title claims description 20
- 238000002360 preparation method Methods 0.000 title description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000000843 powder Substances 0.000 claims abstract description 29
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 27
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 19
- 239000000835 fiber Substances 0.000 claims abstract description 18
- 239000002893 slag Substances 0.000 claims abstract description 17
- 239000004568 cement Substances 0.000 claims abstract description 15
- 239000004743 Polypropylene Substances 0.000 claims abstract description 14
- -1 polypropylene Polymers 0.000 claims abstract description 14
- 229920001155 polypropylene Polymers 0.000 claims abstract description 14
- 229920003086 cellulose ether Polymers 0.000 claims abstract description 13
- 239000011449 brick Substances 0.000 claims abstract description 12
- 239000000919 ceramic Substances 0.000 claims abstract description 12
- 239000010881 fly ash Substances 0.000 claims abstract description 11
- 239000011398 Portland cement Substances 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 8
- 239000010959 steel Substances 0.000 claims abstract description 8
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims description 32
- 238000002156 mixing Methods 0.000 claims description 21
- 238000001035 drying Methods 0.000 claims description 18
- 150000003839 salts Chemical class 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 11
- 239000011259 mixed solution Substances 0.000 claims description 10
- 238000005303 weighing Methods 0.000 claims description 9
- 239000000654 additive Substances 0.000 claims description 8
- 230000000996 additive effect Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 claims description 6
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000007639 printing Methods 0.000 claims description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 4
- BDAGIHXWWSANSR-UHFFFAOYSA-M Formate Chemical compound [O-]C=O BDAGIHXWWSANSR-UHFFFAOYSA-M 0.000 claims description 3
- 229920001732 Lignosulfonate Polymers 0.000 claims description 3
- 229910002651 NO3 Inorganic materials 0.000 claims description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 3
- ABLZXFCXXLZCGV-UHFFFAOYSA-N Phosphorous acid Chemical compound OP(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 125000002723 alicyclic group Chemical group 0.000 claims description 3
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 3
- 239000004327 boric acid Substances 0.000 claims description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000292 calcium oxide Substances 0.000 claims description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims description 3
- 229920002678 cellulose Polymers 0.000 claims description 3
- 239000001913 cellulose Substances 0.000 claims description 3
- CGBRHEMTHVMXEI-UHFFFAOYSA-L dicalcium oxygen(2-) sulfate Chemical compound [O-2].[Ca+2].S(=O)(=O)([O-])[O-].[Ca+2] CGBRHEMTHVMXEI-UHFFFAOYSA-L 0.000 claims description 3
- 239000003651 drinking water Substances 0.000 claims description 3
- 235000020188 drinking water Nutrition 0.000 claims description 3
- 239000006260 foam Substances 0.000 claims description 3
- 239000004519 grease Substances 0.000 claims description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 239000008030 superplasticizer Substances 0.000 claims 2
- 239000012190 activator Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 10
- 238000005336 cracking Methods 0.000 abstract description 3
- 229920006254 polymer film Polymers 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000228347 Monascus <ascomycete fungus> Species 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000002742 anti-folding effect Effects 0.000 description 1
- 238000013475 authorization Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 239000000243 solution Substances 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
- C04B28/06—Aluminous 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
- 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
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 relates to the technical field of 3D printed concrete, and discloses low-drying-shrinkage 3D printed concrete which comprises the following components in parts by weight: 80 to 100 parts of fly ash Portland cement, 10 to 30 parts of sulphoaluminate cement, 0.5 to 1.5 parts of silica fume, 90 to 120 parts of fine aggregate, 1.5 to 3.5 parts of polypropylene fiber, 3 to 5 parts of cellulose ether, 1 to 10 parts of ceramic polished brick powder, 1 to 20 parts of granulated blast furnace slag powder, 1 to 20 parts of steel slag powder, 0.2 to 0.4 part of admixture, 0.1 to 1 part of water reducing agent, 1 to 20 parts of expanding agent and 20 to 30 parts of concrete water. According to the invention, by adding the polypropylene fiber and the cellulose ether, the effects of internal curing and fiber toughening can be achieved, and simultaneously, the cellulose ether is used, so that a thin polymer film capable of preventing internal moisture from leaking outwards is formed between the cellulose ether and cement particles, and the phenomena of dry cracking and shrinkage of 3D printed concrete caused by film-free curing can be effectively reduced.
Description
Technical Field
The invention relates to the technical field of 3D printed concrete, in particular to low-drying-shrinkage 3D printed concrete and a preparation method thereof.
Background
The 3D printing technology is a new processing technology based on the additive manufacturing principle, and has been increasingly used in the civil engineering field in recent years. Compared with the traditional construction mode, the 3D printing construction technology has the advantages that the construction speed is high, templates and a large number of construction workers are not needed, curve buildings which are difficult to construct in other modes can be printed very easily, the production efficiency is greatly improved, and the method has the characteristics of low carbon, green, environmental protection and the like. Due to the unique molding process, the 3D printed concrete faces more serious shrinkage cracking risk than common pouring mode concrete; firstly, in the design process of the mix proportion of the 3D printed concrete, no coarse aggregate is generally used for meeting the requirement of extrudability, the proportion of the cementing material in a concrete system is large and generally reaches 45-50%, and the proportion of the cementing material in the common casting form concrete is generally only 15-25%, so that the shrinkage of the 3D printed concrete is higher than that of the casting form concrete, and in order to prevent the phenomenon, the 3D printed concrete with low drying shrinkage and the preparation method thereof are provided.
The Chinese patent discloses concrete for 3D printing and a preparation method thereof (with an authorization publication number of CN 113636811A), the technology of the patent adopts a dispersion body to disperse triethanolamine in the rest components of the concrete, so that cement particles are not easy to generate coagulation due to the addition of a quick-setting body, the occurrence of hydration reaction is facilitated, the quick-setting effect of the concrete can be improved, and the dispersion body is coated outside the quick-setting body, so that the quick-setting body and the dispersion body have larger combination area, the dispersibility of the quick-setting body in the concrete is further improved, but the compressive strength of the concrete is weaker, the service life and the safety of the concrete are reduced, the performance of resisting drying shrinkage is weaker, and the quality of the concrete is reduced.
Disclosure of Invention
The invention aims to provide 3D printing concrete with low drying shrinkage and a preparation method thereof, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the 3D printing concrete with low drying shrinkage comprises the following components in parts by weight: 80 to 100 parts of fly ash Portland cement, 10 to 30 parts of sulphoaluminate cement, 0.5 to 1.5 parts of silica fume, 90 to 120 parts of fine aggregate, 1.5 to 3.5 parts of polypropylene fiber, 3 to 5 parts of cellulose ether, 1 to 10 parts of ceramic polished brick powder, 1 to 20 parts of granulated blast furnace slag powder, 1 to 20 parts of steel slag powder, 0.2 to 0.4 part of admixture, 0.1 to 1 part of water reducing agent, 1 to 20 parts of expanding agent and 20 to 30 parts of concrete water.
As a still further scheme of the invention: the strength grade of the fly ash portland cement can be 42.5 grade, the initial setting time is not less than 45min, the final setting time is not more than 600min, the strength grade of the sulphoaluminate cement can be 42.5 grade, the initial setting time is 30-50min, and the final setting time is 40-90min.
As a still further scheme of the invention: the fine aggregate is preferably medium sand in a grading II area, the fineness modulus is 3.0-2.3, and the maximum particle size of the fine aggregate is not more than one third of the inner diameter of an outlet of the printing head.
As a still further scheme of the invention: the admixture comprises an early strength agent, a retarder and an accelerator, wherein the early strength agent comprises one or more of formate, chloride, sulfate or nitrate, the retarder comprises one or more of lignosulfonate and derivatives thereof, low molecular weight cellulose and derivatives thereof, hydroxycarboxylic acid (salt), organic phosphonic acid (salt) and boric acid (salt), the accelerator can adopt inorganic salts, the accelerator is initially solidified for 1-5 min and finally solidified for 5-12 min, the fineness of the accelerator is an 80 mu m pore sieve, and the screen residue is less than 10%.
As a still further scheme of the invention: the expanding agent comprises one or a combination of more of a calcium sulfate concrete expanding agent, a calcium sulfate-calcium oxide concrete expanding agent and a calcium oxide concrete expanding agent.
As a still further scheme of the invention: the concrete water comprises concrete mixing water and concrete curing water, wherein the concrete mixing water is municipal drinking water, and the concrete mixing water does not have obvious floating grease and foam and has no obvious color and peculiar smell.
As a still further scheme of the invention: the water reducing agent comprises one of naphthalene-based high-efficiency water reducing agent, alicyclic high-efficiency water reducing agent, hydroxyl speed-limiting water reducing agent and water reducing promoter, and the length of the polypropylene fiber is 20-35 mm.
A preparation method of 3D printing concrete with low drying shrinkage comprises the following steps: the method comprises the following steps:
s1, mixing for the first time: weighing fly ash portland cement, sulphoaluminate cement, fine aggregate, polypropylene fiber, cellulose ether, ceramic polished brick powder, granulated blast furnace slag powder and steel slag powder according to a proportion, pouring the materials into a concrete mixer, and stirring for at least 3 minutes until the materials are uniformly mixed to obtain a first mixture;
s2, mixing for the second time: weighing water for concrete, a water reducing agent and an expanding agent according to the proportion to obtain a mixed solution, adding the mixture into the first mixture of S1 easily, and mixing for 5-10min until the mixture is uniformly stirred to obtain a second mixture;
s3, mixing for the third time: and weighing the additive according to the proportion, introducing the additive into the second mixture of S2, mixing and stirring for 5-10min to obtain the 3D printing concrete with low drying shrinkage.
As a still further scheme of the invention: in the step S2, firstly, one half of the mixed solution is poured into the first mixture and stirred for 5-6min, after the mixed solution is uniformly stirred, the rest one half of the mixed solution is completely poured, and the stirring is continued for 5-6min, so that a uniform and sufficient second mixture is obtained.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, by adding mineral admixtures such as silica fume, ceramic polished brick powder and granulated blast furnace slag powder, the active ingredients can greatly improve the strength and the compactness of concrete and the durability and the service life of the concrete, wherein the ceramic polished brick powder improves the strength of the concrete and has outstanding early strength, in addition, the ceramic polished brick powder has good cohesiveness and water-retaining property, so that the quality of 3D printed concrete is improved, the use is facilitated, and the silica fume has high activity, and acts on the external admixture of the concrete, so that the ceramic polished brick powder plays a great role in enhancing the early strength of the 3D printed concrete, can improve the compactness and strength of the 3D printed concrete, and also improves the flexural strength value of the printed concrete at the later stage, so that the use strength of the 3D printed concrete is improved, and the use strength grade of the 3D printed concrete is met, thereby improving the service life and the safety.
2. According to the invention, by adding the polypropylene fiber and the cellulose ether, the effects of internal curing and fiber toughening can be achieved, the plastic shrinkage crack of concrete can be effectively prevented, and the problem of shrinkage deformation of 3D printed concrete is reduced.
Detailed Description
In the embodiment of the invention, the low-drying-shrinkage 3D printing concrete comprises the following components in parts by weight: 80 to 100 parts of fly ash Portland cement, 10 to 30 parts of sulphoaluminate cement, 0.5 to 1.5 parts of silica fume, 90 to 120 parts of fine aggregate, 1.5 to 3.5 parts of polypropylene fiber, 3 to 5 parts of cellulose ether, 1 to 10 parts of ceramic polished brick powder, 1 to 20 parts of granulated blast furnace slag powder, 1 to 20 parts of steel slag powder, 0.2 to 0.4 part of admixture, 0.1 to 1 part of water reducing agent, 1 to 20 parts of expanding agent and 20 to 30 parts of concrete water.
Preferably: the strength grade of the fly ash silicate cement can be selected to be 42.5 grade, the initial setting time is not less than 45min, the final setting time is not more than 600min, the strength grade of the sulphoaluminate cement can be selected to be 42.5 grade, the initial setting time is 30-50min, and the final setting time is 40-90min, so that the sulphoaluminate cement can obtain faster setting time and better early strength.
Preferably: the fine aggregate is preferably medium sand of grading II area, the fineness modulus is 3.0-2.3, and the maximum particle size of the fine aggregate should not exceed one third of the inner diameter of the outlet of the printing head.
Preferably: the admixture comprises an early strength agent, a retarder and an accelerator, wherein the early strength agent comprises one or more of formate, chloride, sulfate or nitrate, the early strength agent can promote the development of the early strength of concrete, the retarder comprises one or more of lignosulfonate and derivatives thereof, low molecular weight cellulose and derivatives thereof, hydroxycarboxylic acid (salt), organic phosphonic acid (salt) and boric acid (salt), the retarder can enable the concrete to keep plasticity for a long time so as to adjust the setting time of fresh concrete, the accelerator can adopt inorganic salts, the accelerator is initially set for 1-5 min and finally set for 5-12 min, the fineness is a 80 mu m pore sieve, the screen residue is less than 10%, a monascus I type accelerator can be selected, the admixture is one of essential components of modern concrete, and the admixture is an important method and technology for modifying the concrete.
Preferably: the expanding agent comprises one or a combination of more of a calcium sulfate concrete expanding agent, a calcium sulfate-calcium oxide concrete expanding agent and a calcium oxide concrete expanding agent, and can effectively compensate the shrinkage of the 3D printed concrete and improve the early cracking resistance of the 3D printed concrete.
Preferably: the concrete water comprises concrete mixing water and concrete curing water, the concrete mixing water is municipal drinking water, no obvious floating grease or foam is needed, no obvious color or peculiar smell is needed, the pH value, the chloride ion content, the sulfate ion content, the radioactivity index and the like of the concrete curing water are controlled in a key mode, and the water can be properly widened according to the mixing water.
Preferably: the water reducing agent comprises one of a naphthalene-based high-efficiency water reducing agent, an alicyclic high-efficiency water reducing agent, a hydroxyl rate-limiting water reducing agent and a water reducing stimulant, the water reducing agent can increase the hydration efficiency, reduce the unit water consumption, increase the strength, save the cement consumption and improve the workability of unset concrete, and the length of the polypropylene fiber is 20-35 mm.
A preparation method of 3D printing concrete with low drying shrinkage comprises the following steps:
s1, mixing for the first time: weighing fly ash portland cement, sulphoaluminate cement, fine aggregate, polypropylene fiber, cellulose ether, ceramic polished brick powder, granulated blast furnace slag powder and steel slag powder according to a proportion, pouring the materials into a concrete mixer, and stirring for at least 3 minutes until the materials are uniformly mixed to obtain a first mixture;
s2, mixing for the second time: weighing water for concrete, a water reducing agent and an expanding agent according to the proportion to obtain a mixed solution, adding the mixture into the first mixture of S1 easily, and mixing for 5-10min until the mixture is uniformly stirred to obtain a second mixture;
s3, mixing for the third time: weighing an additive according to the proportion, introducing the additive into the second mixture of S2, mixing and stirring for 5-10min to obtain the 3D printing concrete with low drying shrinkage;
s4, conveying concrete: and conveying the uniformly stirred second mixture to a 3D printer, and waiting for printing, wherein the feeding mode of pump or mechanical conveying can be selected, so that the continuity of the concrete during 3D printing can be ensured.
Preferably: and S2, firstly, pouring one half of the mixed solution into the first mixture, stirring for 5-6min, pouring all the rest one half of the mixed solution after uniformly stirring, and continuously stirring for 5-6min to obtain a uniform and sufficient second mixture.
To better illustrate the technical effect of the present invention, it is illustrated by the following tests:
in the invention, 90 parts of fly ash portland cement, 20 parts of sulphoaluminate cement, 1 part of silica fume, 100 parts of fine aggregate, 2.5 parts of polypropylene fiber, 4 parts of cellulose ether, 5 parts of ceramic polished brick powder, 10 parts of granulated blast furnace slag powder, 10 parts of steel slag powder, 0.3 part of additive, 0.5 part of water reducing agent, 10 parts of expanding agent and 25 parts of water for concrete are taken as an example one.
Selecting 3D printing concrete prepared by a concrete for 3D printing disclosed by a patent network and a preparation method thereof (published as 2018-05-10, and publication number of CN 108046720A) as a first comparative example;
the concrete products of the first embodiment and the first comparative embodiment are 3D printed to form concrete test pieces with a height of 50mm and a size of 600mm × 50mm × 200mm, and the fluidity of the concrete, the compressive strength, the flexural strength and the shrinkage rate of the concrete after one week are tested under the same environmental conditions of temperature, humidity and wind speed, and the test results are shown in table 1.
Table 1: concrete performance analysis meter
From table 1 it can be derived: the fluidity of the first example is lower than that of the first comparative example, and the fluidity of the concrete is reduced due to the addition of the fiber with the water-retaining property in the first example, but the 3D printing discharge is not influenced, and the setting time is shortened; the numerical values of the compressive strength and the flexural strength in the first embodiment are greater than those in the first comparative example, so that the compressive strength and the flexural strength of the concrete in the first embodiment are better, the strength grade of the 3D printed concrete is met, and the service life and the safety of the 3D printed concrete are improved; the shrinkage rate in the first embodiment is lower than that of the first comparative example, so that the effect of dry shrinkage resistance in the first embodiment is better, the polypropylene fiber and the cellulose ether are added in the first embodiment, the concrete is effectively prevented from generating plastic shrinkage cracks, and the effects of internal curing and fiber toughening can be achieved, so that the effect of low dry shrinkage is achieved, and the following effects can be obtained: this application can improve the problem of concrete shrink well, improves the 3D greatly and prints the effect that the concrete resistance to compression was anti-folding.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (9)
1. The 3D printing concrete with low drying shrinkage is characterized by comprising the following components in parts by weight: 80 to 100 parts of fly ash Portland cement, 10 to 30 parts of sulphoaluminate cement, 0.5 to 1.5 parts of silica fume, 90 to 120 parts of fine aggregate, 1.5 to 3.5 parts of polypropylene fiber, 3 to 5 parts of cellulose ether, 1 to 10 parts of ceramic polished brick powder, 1 to 20 parts of granulated blast furnace slag powder, 1 to 20 parts of steel slag powder, 0.2 to 0.4 part of admixture, 0.1 to 1 part of water reducing agent, 1 to 20 parts of expanding agent and 20 to 30 parts of concrete water.
2. The 3D printed concrete with low drying shrinkage as claimed in claim 1, wherein the strength grade of the fly ash portland cement can be selected from 42.5 grades, the initial setting time is not less than 45min, the final setting time is not more than 600min, the strength grade of the sulphoaluminate cement can be selected from 42.5 grades, the initial setting time is 30-50min, and the final setting time is 40-90min.
3. The 3D printing concrete with low drying shrinkage as claimed in claim 1, wherein the fine aggregate is medium sand of grading II area, the fineness modulus is 3.0-2.3, and the maximum particle size of the fine aggregate is not more than one third of the inner diameter of the outlet of the printing head.
4. The 3D printing concrete with low drying shrinkage as claimed in claim 1, wherein the admixture comprises an early strength agent, a retarder and an accelerator, the early strength agent comprises one or more of formate, chloride, sulfate or nitrate, the retarder comprises one or more of lignosulfonate and derivatives thereof, low molecular weight cellulose and derivatives thereof, hydroxycarboxylic acid (salt), organic phosphonic acid (salt) and boric acid (salt), the accelerator can adopt inorganic salts, the accelerator is initially set for 1-5 min and finally set for 5-12 min, the fineness of the accelerator is 80 μm of a pore sieve, and the screen residue is less than 10%.
5. The 3D printed concrete with low drying shrinkage as claimed in claim 1, wherein the expanding agent comprises one or more of a calcium sulfate concrete expanding agent, a calcium sulfate-calcium oxide concrete expanding agent and a calcium oxide concrete expanding agent.
6. The 3D printed concrete with low drying shrinkage as claimed in claim 1, wherein the concrete water comprises concrete mix water and concrete curing water, the concrete mix water is municipal drinking water, and the concrete mix water should not float obviously grease and foam, and should not have obvious color and peculiar smell.
7. The 3D printed concrete with low drying shrinkage as claimed in claim 1, wherein the water reducing agent comprises one of naphthalene-based superplasticizer, alicyclic superplasticizer, hydroxyl rate-limiting water reducing agent and water-reducing activator, and the length of the polypropylene fiber is 20-35 mm.
8. A method of preparing 3D printed concrete to achieve low drying shrinkage according to claim 1, characterized by the steps of:
s1, mixing for the first time: weighing fly ash portland cement, sulphoaluminate cement, fine aggregate, polypropylene fiber, cellulose ether, ceramic polished brick powder, granulated blast furnace slag powder and steel slag powder according to a proportion, pouring the materials into a concrete mixer, and stirring for at least 3 minutes until the materials are uniformly mixed to obtain a first mixture;
s2, mixing for the second time: weighing water for concrete, a water reducing agent and an expanding agent according to the proportion to obtain a mixed solution, adding the mixture into the first mixture of S1 easily, and mixing for 5-10min until the mixture is uniformly stirred to obtain a second mixture;
s3, mixing for the third time: weighing an additive according to the proportion, introducing the additive into the second mixture of S2, mixing and stirring for 5-10min to obtain the 3D printing concrete with low drying shrinkage;
s4, conveying concrete: and conveying the uniformly stirred second mixture to a 3D printer to wait for printing.
9. The method for preparing 3D printed concrete with low drying shrinkage as claimed in claim 8, wherein in S2, one half of the mixed solution is poured into the first mixture and stirred for 5-6min, after the mixture is stirred uniformly, the rest one half of the mixed solution is poured into the first mixture, and the stirring is continued for 5-6min, so as to obtain a uniform and sufficient second mixture.
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Application publication date: 20230113 |