CN112521114A - Fiber reinforced cement-based composite material for 3D printing and preparation method thereof - Google Patents

Fiber reinforced cement-based composite material for 3D printing and preparation method thereof Download PDF

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Publication number
CN112521114A
CN112521114A CN202011497713.5A CN202011497713A CN112521114A CN 112521114 A CN112521114 A CN 112521114A CN 202011497713 A CN202011497713 A CN 202011497713A CN 112521114 A CN112521114 A CN 112521114A
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cement
stirring
composite material
printing
water
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薛晓丽
叶林
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Jiangsu Jicui Composite Material Equipment Research Institute Co ltd
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Jiangsu Jicui Composite Material Equipment Research Institute Co ltd
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/06Aluminous cements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B33ADDITIVE MANUFACTURING TECHNOLOGY
    • B33YADDITIVE 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
    • B33Y70/00Materials specially adapted for additive manufacturing
    • B33Y70/10Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B33ADDITIVE MANUFACTURING TECHNOLOGY
    • B33YADDITIVE 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
    • B33Y80/00Products made by additive manufacturing
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00034Physico-chemical characteristics of the mixtures
    • C04B2111/00146Sprayable or pumpable mixtures
    • C04B2111/00155Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00034Physico-chemical characteristics of the mixtures
    • C04B2111/00181Mixtures specially adapted for three-dimensional printing (3DP), stereo-lithography or prototyping
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20Resistance against chemical, physical or biological attack
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20Resistance against chemical, physical or biological attack
    • C04B2111/27Water resistance, i.e. waterproof or water-repellent materials
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

Abstract

The invention discloses a fiber reinforced cement-based composite material for 3D printing, which comprises the following raw materials in parts by weight: 1 part of cement, 0.2-0.8 part of mineral admixture, 0.3-1.0 part of fine aggregate, 0.4-0.7 part of water, 0.001-0.006 part of water reducing agent, 0.0004-0.002 part of accelerating agent, 0.0008-0.004 part of retarder, 0.001-0.004 part of defoaming agent, 0.001-0.007 part of thickening agent, 0.01-0.07 part of latex powder and 0.01-0.06 part of stainless steel fiber. The material of the invention not only has better fluidity, extrudability and construction type, but also has higher mechanical property and chlorine salt erosion resistance, and is suitable for marine environment.

Description

Fiber reinforced cement-based composite material for 3D printing and preparation method thereof
Technical Field
The invention relates to the technical field of composite materials, in particular to a fiber reinforced cement-based composite material for 3D printing and a preparation method thereof.
Background
The 3D printing technology becomes the most important part in intelligent manufacturing as an innovative manufacturing process with great potential, and is applied to different industries; because of the advantages of freedom, no humanization, high efficiency, green environmental protection and the like, the composite material has wide application prospect in the building industry, prefabricated parts and other aspects, and has important strategic significance for ocean engineering and severe environmental engineering.
The 3D printing technology forming process is different from the traditional forming process, so higher requirements are put forward on the performance of the cement-based material. At present, mortar is mostly adopted for 3D printing of cement-based materials, coarse aggregate is rarely added, and reinforcement cannot be carried out, so that the mechanical strength is low, and the application of a 3D printing technology in the cement-based materials is seriously influenced. In the traditional forming process, a high-ductility cement-based composite material has the characteristics of multi-crack cracking and strain hardening and excellent crack control capability. Has obvious advantages in some engineering with larger tensile stress. The composite material is applied to 3D printing and can be applied to marine engineering environment, and has important strategic significance.
Patent CN107500687A discloses a high-ductility fiber reinforced cement-based composite material for 3D printing and a preparation method thereof, the main components of the high-ductility fiber reinforced cement-based composite material are rheology adjusting components, setting and hardening adjusting components, interlayer bonding strength adjusting components, volume stabilizers, water reducing agents and other additive compositions, and aggregate, and the high-ductility fiber reinforced cement-based composite material is obtained by optimization design. The prepared material can form ductility meeting structural requirements without reinforcing steel bars, and has excellent tensile ductility, but the used fibers are polyester fibers, polypropylene fibers, polyethylene fibers or polyvinyl alcohol fibers, and the like, the tensile strength is low, the high ductility characteristic is difficult to retain by adding the fibers, the engineering requirements of high strength and high ductility cannot be met, the common steel fibers are easy to rust, and particularly in the marine environment, when the steel fibers are corroded by chlorine salt, the tensile strength is reduced due to the rust corrosion of the steel fibers, and the service life of the steel fibers is influenced; in addition, a large amount of additive components are applied, the manufacturing process is complex, the material cost is high, and the concept of no humanization, saving and high efficiency in 3D printing is not met.
To sum up, can be fine solve the unable problem of arrangement of reinforcement of 3D printing cement-based material through mixing the fibre at present, however the polyethylene fiber that mostly uses, glass fiber, polypropylene fiber etc. its tensile strength is low, mix this kind of fibre and be difficult to keep high ductility characteristic, can not adapt to the engineering demand of high strength high ductility, ordinary steel fiber also obtains extensive application simultaneously, but it is in ocean engineering, stand the serious problem that the chlorion erodees, easy corrosion to influence its tensile strength, further influence its service life.
Disclosure of Invention
In view of the above problems in the prior art, the present applicant provides a fiber reinforced cement-based composite material for 3D printing and a method for preparing the same. The material of the invention not only has better fluidity, extrudability and construction type, but also has higher mechanical property and chlorine salt erosion resistance, and is suitable for marine environment. The preparation method is simple, convenient to construct and suitable for 3D printing of the high-ductility cement-based composite material under different working conditions.
The technical scheme of the invention is as follows:
the fiber reinforced cement-based composite material for 3D printing comprises the following raw materials in parts by weight:
1 part of cement, 0.2-0.8 part of mineral admixture, 0.3-1.0 part of fine aggregate, 0.4-0.7 part of water, 0.001-0.006 part of water reducing agent, 0.0004-0.002 part of accelerating agent, 0.0008-0.004 part of retarder, 0.001-0.004 part of defoaming agent, 0.001-0.007 part of thickening agent, 0.01-0.07 part of latex powder and 0.01-0.06 part of stainless steel fiber.
The cement is one or two mixtures of ordinary portland cement and quick-hardening sulphoaluminate cement; the 28-day flexural strength of the ordinary portland cement is 9-11 MPa, the 28-day compressive strength is 48-54 MPa, the water consumption for standard consistency is 22-27%, the initial setting time is 140-160 min, and the final setting time is 220-270 min; the quick-hardening sulphoaluminate cement comprises red mud, aluminum ash, carbide slag and desulfurized gypsum, the loss on ignition is 10-14%, and the 1-day compressive strength is 60-75 MPa.
The mineral admixture is one or more of blast furnace slag, fly ash and silica fume; the fine aggregate is ground quartz sand with the grain diameter of 6-20 meshes and SiO2The content is more than 98 percent; the water reducing agent is a liquid or solid polycarboxylic acid water reducing agent.
The accelerating agent is alkaline aluminate or lithium carbonate; the retarder is anhydrous citric acid; the defoaming agent is a quick defoaming type defoaming agent, and the main component is modified polysiloxane.
The thickening agent is one or more of modified starch ether, hydroxypropyl methyl cellulose, hydroxyethyl methyl cellulose and lignocellulose, wherein the viscosity of the modified starch ether is 1-5 ten thousand, and the viscosity of the hydroxypropyl methyl cellulose is 4-20 ten thousand.
The latex powder is a welt gum or a redispersible latex powder; the length of the stainless steel fiber is 3-18 mm, and the diameter of the stainless steel fiber is 0.03-0.12 mm.
A method of making a fiber cement-based composite material for 3D printing, the method comprising the steps of:
(1) mixing 1 part of cement, 0.2-0.8 part of mineral admixture, 0.3-1.0 part of fine aggregate, 0.0008-0.004 part of retarder, 0.001-0.004 part of defoaming agent and 0.01-0.07 part of latex powder, and stirring to obtain a mixture I;
(2) putting 0.001-0.006 part of water reducing agent and 0.001-0.007 part of thickening agent into required water, wherein the water accounts for 80% of the total water consumption (0.4-0.7 part), uniformly stirring, pouring into the mixture I prepared in the step (1), and stirring to obtain slurry I;
(3) dispersing 0.01-0.06 part of stainless steel fibers into the slurry I prepared in the step (2), and stirring to obtain slurry II with uniformly dispersed stainless steel fibers;
(4) and (3) conveying the slurry II obtained in the step (3) to a cement 3D printing spray head through a stirring pump, adding 0.0004-0.002 part of accelerator into the residual water, wherein the water accounts for 20% of the total water consumption, mixing the solution and the slurry II obtained in the step (2) at the spray head after stirring, and printing to obtain the composite material.
In the step (1), the stirring frequency is 140-280 r/min, and the stirring time is 3-5 min; in the step (2), the stirring frequency is 140-280 r/min, and the stirring time is 3-5 min; in the step (3), the stirring frequency is 140-280 r/min, and the stirring time is 5-10 min.
In the step (4), the initial setting time of the composite material is 20-60 min, and the final setting time is 50-100 min.
The beneficial technical effects of the invention are as follows:
the material meets the requirements of fluidity, extrudability and constructability, and simultaneously uses the stainless steel fiber reinforced cement-based material, so that the material is suitable for 3D printing, has higher mechanical property and has the remarkable advantage of resisting chlorine salt erosion.
The stainless steel fiber doped in the fiber reinforced cement-based material has high tensile strength and chlorine salt corrosion resistance, and the latex powder is matched to ensure that the material has certain waterproofness, so that seawater containing chlorine ions can be inhibited from permeating into the material in the chlorine salt environment such as seawater, and the material is not easy to rust and is suitable for the marine environment. The fiber reinforced cement-based material of the invention uses retarder and accelerator simultaneously, can continuously adjust the initial and final setting time of the material, and is suitable for different building projects.
The fiber reinforced cement-based material and the preparation method thereof enable the material to have good fluidity in a conveying system, have good viscosity and good accumulation at a nozzle, and balance the contradiction between fluidity and accumulation in the 3D printing process.
Drawings
FIG. 1 is a flow chart of the preparation method of the present invention.
FIG. 2 is a diagram showing an actual printing of a composite material obtained by printing according to the example.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
Example 1:
a method of making a fiber cement-based composite material for 3D printing, the method comprising the steps of:
(1) 0.9 portion of ordinary portland cement, 0.1 portion of sulphoaluminate cement and 0.2 portion of fly ash (class F first-grade fly ash with the specific surface area of 740m2Kg), 0.4 parts of ground quartz sand (granules)Diameter of 10 mesh, SiO2The content is more than 98 percent), 0.001 part of anhydrous citric acid, 0.002 part of quick defoaming type foam control agent (main component modified polysiloxane) and 0.04 part of welan gum are mixed, the stirring frequency is 140r/min, and the stirring time is 3min to obtain a mixture I; the 28-day flexural strength of the ordinary portland cement is 9-11 MPa, the 28-day compressive strength is 48-54 MPa, the water consumption for standard consistency is 22-27%, the initial setting time is 140-160 min, and the final setting time is 220-270 min; the sulphoaluminate cement comprises red mud, aluminum ash, carbide slag and desulfurized gypsum, the loss on ignition is 10-14%, and the 1-day compressive strength is 60-75 MPa.
(2) Putting 0.002 part of solid polycarboxylic acid water reducing agent and 0.001-0.007 part of hydroxypropyl methyl cellulose (the viscosity is 4 ten thousand) into 0.32 part of tap water, uniformly stirring, pouring into the mixture I prepared in the step (1), wherein the stirring frequency is 280r/min, and the stirring time is 5min to obtain slurry I;
(3) 0.06 part of stainless steel fiber (fiber length of 6mm, diameter of 0.1mm, tensile strength of 2850MPa, density of 7.9 g/cm)3) Dispersing into the slurry I prepared in the step (2), wherein the stirring frequency is 280r/min, and the stirring time is 6min, so as to obtain slurry II with uniformly dispersed stainless steel fibers;
(4) and (3) conveying the slurry II obtained in the step (3) to a cement 3D printing spray head through a stirring pump, adding 0.0005 part of lithium carbonate powder accelerator into 0.08 part of tap water, stirring, mixing the solution with the slurry II obtained in the step (2) at the spray head, and printing to obtain the composite material.
The fiber reinforced cement-based composite material of example 1 has good printing performance and stacking performance, and the printed slurry has good bearing capacity, so that when the fiber reinforced cement-based composite material is printed layer by layer, the lowest layer cannot deform and slump, and the layer-to-layer bonding force is good. Printing can be continuously carried out during extrusion until the slurry is used. According to the detection method for water consumption, setting time and stability of the standard consistency of cement (GB/T1346-2011), the initial setting time of the printing material is 40min, and the final setting time is 65 min. According to GB/T17671-1999 cement mortar strength test method, after test sample standard maintenance for 3d, the flexural strength is 12.64MPa, and the compressive strength is 35.45 MPa. According to JGJT 70-2009 'Standard test method for basic Performance of building mortar', the water absorption of the material is tested to be 6.5%, and the material has good waterproofness.
Example 2:
a method of making a fiber cement-based composite material for 3D printing, the method comprising the steps of:
(1) 0.8 part of ordinary portland cement, 0.2 part of sulphoaluminate cement, 0.3 part of ground blast furnace slag (specific surface area 430 m)2Perkg, 28 days activity index is more than or equal to 95), 0.2 part of fly ash (class F first class fly ash, specific surface area is 740m2Per kg), 0.5 parts of ground quartz sand (particle size 10 mesh, SiO)2The content of the citric acid is more than 98 percent), 0.0008 part of anhydrous citric acid, 0.002 part of quick defoaming type foam control agent (main component modified polysiloxane) and 0.05 part of welan gum are mixed, the stirring frequency is 140r/min, and the stirring time is 3min to obtain a mixture I; the 28-day flexural strength of the ordinary portland cement is 9-11 MPa, the 28-day compressive strength is 48-54 MPa, the water consumption for standard consistency is 22-27%, the initial setting time is 140-160 min, and the final setting time is 220-270 min; the sulphoaluminate cement comprises red mud, aluminum ash, carbide slag and desulfurized gypsum, the loss on ignition is 10-14%, and the 1-day compressive strength is 60-75 MPa.
(2) Putting 0.002 part of solid polycarboxylic acid water reducing agent and 0.005 part of modified starch ether (with the viscosity of 5 ten thousand) into 0.4 part of tap water, uniformly stirring, pouring into the mixture I prepared in the step (1), wherein the stirring frequency is 280r/min, and the stirring time is 5min, so as to obtain slurry I;
(3) 0.06 part of stainless steel fiber (fiber length 12mm, diameter 0.12mm, tensile strength 2850MPa, density 7.9 g/cm)3) Dispersing into the slurry I prepared in the step (2), wherein the stirring frequency is 280r/min, and the stirring time is 6min, so as to obtain slurry II with uniformly dispersed stainless steel fibers;
(4) and (3) conveying the slurry II obtained in the step (3) to a cement 3D printing spray head through a stirring pump, adding 0.0004 part of lithium carbonate powder accelerator into 0.1 part of tap water, stirring, mixing the solution and the slurry II obtained in the step (2) at the spray head, and printing to obtain the composite material.
And (3) test results: the fiber reinforced cement-based composite material of example 2 has good fluidity in the pipeline transportation link, good stacking performance after printing, and good bearing capacity, and after 6 layers are printed, the lowest layer still does not have great deformation and slump, and has good adhesion between layers. Printing can be continuously carried out during extrusion until the slurry is used. According to the detection method for water consumption, setting time and stability of the standard consistency of cement (GB/T1346-2011), the initial setting time of the printing material is 25min, and the final setting time is 50 min. According to GB/T17671-1999 cement mortar strength test method, after test sample standard maintenance for 3d, the flexural strength is 13.73MPa, and the compressive strength is 36.84 MPa. According to JGJT 70-2009 'Standard test method for basic Performance of building mortar', the water absorption of the material is tested to be 6.5%, and the material has good waterproofness.
Example 3:
a method of making a fiber cement-based composite material for 3D printing, the method comprising the steps of:
(1) 0.85 part of ordinary portland cement, 0.15 part of sulphoaluminate cement, 0.4 part of ground blast furnace slag (specific surface area 430 m)2Perkg, 28 days activity index is more than or equal to 95), 0.1 part of fly ash (class F first class fly ash, specific surface area is 740m2Kg), 0.1 part of silica fume (the specific surface area is 25000-29000 m)2Per kg, SiO thereof2Content is more than 90 percent) and 0.45 part of fine ground quartz sand (grain diameter is 15 meshes, SiO is used2The content is more than 98 percent), 0.001 part of anhydrous citric acid, 0.003 part of quick defoaming type foam control agent (main component modified polysiloxane) and 0.06 part of redispersible latex powder are mixed, the stirring frequency is 140r/min, and the stirring time is 3min to obtain a mixture I; the 28-day flexural strength of the ordinary portland cement is 9-11 MPa, the 28-day compressive strength is 48-54 MPa, the water consumption for standard consistency is 22-27%, the initial setting time is 140-160 min, and the final setting time is 220-270 min; the sulphoaluminate cement comprises red mud, aluminum ash, carbide slag and desulfurized gypsum, and the loss on ignition is 10-14% and 1%The compressive strength per day is 60-75 MPa.
(2) Putting 0.002 part of solid polycarboxylic acid water reducing agent and 0.001 part of hydroxypropyl methyl cellulose (with the viscosity of 10 ten thousand) into 0.425 part of tap water, uniformly stirring, pouring into the mixture I prepared in the step (1), wherein the stirring frequency is 280r/min, and the stirring time is 5min, so as to obtain slurry I;
(3) 0.03 part of stainless steel fiber (fiber length of 6mm, diameter of 0.12mm, tensile strength of 2850MPa, density of 7.9 g/cm)3) Dispersing into the slurry I prepared in the step (2), wherein the stirring frequency is 280r/min, and the stirring time is 6min, so as to obtain slurry II with uniformly dispersed stainless steel fibers;
(4) and (3) conveying the slurry II obtained in the step (3) to a cement 3D printing spray head through a stirring pump, adding 0.0005 part of alkaline aluminate accelerator into 0.075 part of tap water, stirring, mixing the solution and the slurry II obtained in the step (2) at the spray head, and printing to obtain the composite material.
And (3) test results: the fiber reinforced cement-based composite material of embodiment 3 has good fluidity in the pipeline transportation link, good stacking performance and good bearing capacity after printing, the lower layer does not deform and slump after stacking layer by layer, the actual printing height is basically equal to the design height, and good adhesion is provided between layers. Printing can be continuously carried out during extrusion until the slurry is used. According to the detection method for water consumption, setting time and stability of the standard consistency of cement (GB/T1346-2011), the initial setting time of the printing material is 55min, and the final setting time is 75 min. According to GB/T17671-1999 cement mortar strength test method, after test sample standard maintenance for 3d, the flexural strength is 12.53MPa, and the compressive strength is 35.18 MPa. According to JGJT 70-2009 'Standard test method for basic Performance of building mortar', the water absorption of the material is 7.0%, and the material has good waterproofness.
Comparative example 1:
a method of making a fiber cement-based composite material for 3D printing, the method comprising the steps of:
(1) mixing 0.9 parts of ordinary Portland cement and 0.1 part of sulfurAluminate cement, 0.2 fly ash (class F first-grade fly ash, specific surface area is 740 m)2Per kg), 0.4 parts of ground quartz sand (particle size of 10 mesh, SiO)2The content is more than 98 percent), 0.001 part of anhydrous citric acid and 0.002 part of quick defoaming type foam control agent (main component modified polysiloxane) are mixed, the stirring frequency is 140r/min, and the stirring time is 3min, so that a mixture I is obtained; the 28-day flexural strength of the ordinary portland cement is 9-11 MPa, the 28-day compressive strength is 48-54 MPa, the water consumption for standard consistency is 22-27%, the initial setting time is 140-160 min, and the final setting time is 220-270 min; the sulphoaluminate cement comprises red mud, aluminum ash, carbide slag and desulfurized gypsum, the loss on ignition is 10-14%, and the 1-day compressive strength is 60-75 MPa.
(2) Putting 0.002 part of solid polycarboxylic acid water reducing agent and 0.001-0.007 part of hydroxypropyl methyl cellulose (the viscosity is 4 ten thousand) into 0.32 part of tap water, uniformly stirring, pouring into the mixture I prepared in the step (1), wherein the stirring frequency is 280r/min, and the stirring time is 5min to obtain slurry I;
(3) 0.06 part of stainless steel fiber (fiber length of 6mm, diameter of 0.1mm, tensile strength of 2850MPa, density of 7.9 g/cm)3) Dispersing into the slurry I prepared in the step (2), wherein the stirring frequency is 280r/min, and the stirring time is 6min, so as to obtain slurry II with uniformly dispersed stainless steel fibers;
(4) and (3) conveying the slurry II obtained in the step (3) to a cement 3D printing spray head through a stirring pump, adding 0.0005 part of lithium carbonate powder accelerator into 0.08 part of tap water, stirring, mixing the solution with the slurry II obtained in the step (2) at the spray head, and printing to obtain the composite material.
And (3) test results: the fiber reinforced cement-based composite material of comparative example 1 has good printing performance and stacking performance, and the printed slurry has good bearing capacity, so that when the fiber reinforced cement-based composite material is printed layer by layer, the lowest layer cannot deform and slump, and the layers have good adhesion. Printing can be continuously carried out during extrusion until the slurry is used. According to the detection method for water consumption, setting time and stability of the standard consistency of cement (GB/T1346-2011), the initial setting time of the printing material is 40min, and the final setting time is 65 min. According to GB/T17671-1999 cement mortar strength test method, after test sample standard maintenance for 3d, the flexural strength is 12.98MPa, and the compressive strength is 36.15 MPa. According to JGJT 70-2009 Standard test method for basic Performance of building mortar, the water absorption of the material is 9.0%, compared with the material in example 1, the water absorption is improved by 2.5%, and the waterproofness is far inferior to that of the material in example 1.

Claims (9)

1. The fiber reinforced cement-based composite material for 3D printing is characterized by comprising the following raw materials in parts by weight:
1 part of cement, 0.2-0.8 part of mineral admixture, 0.3-1.0 part of fine aggregate, 0.4-0.7 part of water, 0.001-0.006 part of water reducing agent, 0.0004-0.002 part of accelerating agent, 0.0008-0.004 part of retarder, 0.001-0.004 part of defoaming agent, 0.001-0.007 part of thickening agent, 0.01-0.07 part of latex powder and 0.01-0.06 part of stainless steel fiber.
2. The composite material according to claim 1, wherein the cement is one or a mixture of ordinary portland cement and rapid hardening sulphoaluminate cement; the 28-day flexural strength of the ordinary portland cement is 9-11 MPa, the 28-day compressive strength is 48-54 MPa, the water consumption for standard consistency is 22-27%, the initial setting time is 140-160 min, and the final setting time is 220-270 min; the quick-hardening sulphoaluminate cement comprises red mud, aluminum ash, carbide slag and desulfurized gypsum, the loss on ignition is 10-14%, and the 1-day compressive strength is 60-75 MPa.
3. The composite material of claim 1, wherein the mineral admixture is one or more of blast furnace slag, fly ash, silica fume; the fine aggregate is ground quartz sand with the grain diameter of 6-20 meshes and SiO2The content is more than 98 percent; the water reducing agent is a liquid or solid polycarboxylic acid water reducing agent.
4. The composite material according to claim 1, wherein the accelerating agent is an alkali aluminate or lithium carbonate; the retarder is anhydrous citric acid; the defoaming agent is a quick defoaming type defoaming agent, and the main component is modified polysiloxane.
5. The composite material according to claim 1, wherein the thickener is one or more of modified starch ether, hydroxypropyl methyl cellulose, hydroxyethyl methyl cellulose and lignocellulose, wherein the viscosity of the modified starch ether is 1 to 5 ten thousand, and the viscosity of the hydroxypropyl methyl cellulose is 4 to 20 ten thousand.
6. The composite of claim 1, wherein the latex powder is a welt gum or a redispersible latex powder; the length of the stainless steel fiber is 3-18 mm, and the diameter of the stainless steel fiber is 0.03-0.12 mm.
7. A method of preparing a fiber cement-based composite material for 3D printing according to claim 1, comprising the steps of:
(1) mixing 1 part of cement, 0.2-0.8 part of mineral admixture, 0.3-1.0 part of fine aggregate, 0.0008-0.004 part of retarder, 0.001-0.004 part of defoaming agent and 0.01-0.07 part of latex powder, and stirring to obtain a mixture I;
(2) putting 0.001-0.006 part of water reducing agent and 0.001-0.007 part of thickening agent into required water, wherein the water accounts for 80% of the total water consumption (0.4-0.7 part), uniformly stirring, pouring into the mixture I prepared in the step (1), and stirring to obtain slurry I;
(3) dispersing 0.01-0.06 part of stainless steel fibers into the slurry I prepared in the step (2), and stirring to obtain slurry II with uniformly dispersed stainless steel fibers;
(4) and (3) conveying the slurry II obtained in the step (3) to a cement 3D printing spray head through a stirring pump, adding 0.0004-0.002 part of accelerator into the residual water, wherein the water accounts for 20% of the total water consumption, mixing the solution and the slurry II obtained in the step (2) at the spray head after stirring, and printing to obtain the composite material.
8. The preparation method according to claim 7, wherein in the step (1), the stirring frequency is 140 to 280r/min, and the stirring time is 3 to 5 min; in the step (2), the stirring frequency is 140-280 r/min, and the stirring time is 3-5 min; in the step (3), the stirring frequency is 140-280 r/min, and the stirring time is 5-10 min.
9. The preparation method according to claim 7, wherein in the step (4), the initial setting time of the composite material is 20-60 min, and the final setting time is 50-100 min.
CN202011497713.5A 2020-12-17 2020-12-17 Fiber reinforced cement-based composite material for 3D printing and preparation method thereof Pending CN112521114A (en)

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CN114988770A (en) * 2022-05-31 2022-09-02 哈尔滨理工大学 Extrusion curing type 3D printing fiber-alkali slag material and preparation method thereof

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CN114988770A (en) * 2022-05-31 2022-09-02 哈尔滨理工大学 Extrusion curing type 3D printing fiber-alkali slag material and preparation method thereof

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