CN113501699A - High-toughness concrete 3D printing composite material and coordinated printing process thereof - Google Patents
High-toughness concrete 3D printing composite material and coordinated printing process thereof Download PDFInfo
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- CN113501699A CN113501699A CN202110867332.XA CN202110867332A CN113501699A CN 113501699 A CN113501699 A CN 113501699A CN 202110867332 A CN202110867332 A CN 202110867332A CN 113501699 A CN113501699 A CN 113501699A
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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
- C04B28/06—Aluminous cements
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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
- B33Y10/00—Processes of additive manufacturing
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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
- 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
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Abstract
The invention discloses a high-toughness concrete 3D printing composite material and a coordinated printing process thereof, wherein the high-toughness concrete 3D printing composite material comprises conventional 3D printing concrete and high-toughness 3D printing concrete, and the conventional 3D printing concrete comprises the following components: portland cement, sulphoaluminate cement, silica fume, quartz sand, fine aggregate, a water reducing agent and water; the high-toughness 3D printing concrete comprises the following components: portland cement, sulphoaluminate cement, silica fume, quartz sand, fine aggregate, PE fiber, steel fiber, a water reducing agent, cellulose and water. According to the high-toughness concrete 3D printing composite material and the coordinated printing process thereof, the high-toughness 3D concrete material is used for strengthening the conventional 3D printing concrete by virtue of excellent mechanical toughness, so that the problem that a reinforcing steel bar net rack is difficult to implant synchronously is solved, the high-toughness 3D printing concrete and the conventional 3D printing material are used for preparing the composite material, the problem of new and old interfaces of the material can be effectively solved, and the synergistic bearing of the composite material is realized.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a high-toughness concrete 3D printing composite material and a coordinated printing process thereof.
Background
The concrete 3D printing technology has been expanded to the field of bearing structure engineering as an efficient, economic and intelligent construction mode, but is difficult to adapt to engineering application due to the defects that the synchronous implantation of a reinforcing steel bar net rack is difficult to realize in the construction process, the ductility of a 3D printing structure is insufficient, the structure is easy to crack, the bearing performance is low and the like. High-ductility concrete (such as engineering cement-based composite material (ECC), ultra-high performance concrete (UHPC) and hardened cement-based composite material (SHCC) and the like) is a cement-based composite material with good mechanical property and high toughness, the high-ductility concrete has excellent mechanical property at present, and is highly compatible and complementary with a building 3D printing technology in the aspect of intelligent building concept, the design and the building of a structure are flexible, fine and sustainable, but the high-ductility concrete is expensive in manufacturing cost and is difficult to adapt to large-scale production and application. Along with the deep development of the concrete 3D printing structural application, the integrated concrete 3D printing structure with higher structural bearing performance and economy is built, and the integrated concrete 3D printing structure becomes a new power for boosting intelligent building development.
Disclosure of Invention
The invention aims to provide a high-toughness concrete 3D printing composite material and a coordinated printing process thereof, and aims to solve the problems that a high-ductility concrete structure used in the concrete 3D printing technology is low in bearing performance and economical efficiency.
In order to achieve the aim, the invention provides a high-toughness concrete 3D printing composite material, which comprises conventional 3D printing concrete and high-toughness 3D printing concrete,
the conventional 3D printing concrete comprises the following components in parts by weight:
710 to 730 parts of Portland cement,
70-90 parts of sulphoaluminate cement,
180-210 parts of silica fume,
300-1500 parts of quartz sand,
1000-2000 parts of fine aggregate,
4-10 parts of a water reducing agent,
350-450 parts of water;
the high-toughness 3D printing concrete comprises the following components in parts by weight:
680-720 parts of Portland cement,
60-80 parts of sulphoaluminate cement,
190-210 parts of silica fume,
330-1500 parts of quartz sand,
350-370 parts of fine aggregate,
7-10 parts of PE fiber,
70-80 parts of steel fiber,
8-22 parts of a water reducing agent,
1-3 parts of cellulose,
300-400 parts of water.
Preferably, the strength grade of the portland cement is not lower than 42.5.
Preferably, the sulphoaluminate cement is one or more of quick-hardening sulphoaluminate cement and high-strength sulphoaluminate cement.
Preferably, the particle size of the silica fume is 0.2-35 μm; the particle size of the quartz sand is 0.075-0.15 mm, and the bulk density of the quartz sand is 1430-1450 kg/m3。
Preferably, the particle size of the fine aggregate is 0.15-0.3 mm, the fineness modulus is 1.8, and the bulk density is 1610-1630 kg/m3。
Preferably, the length of the steel fiber is 9-15 mm, the diameter of the steel fiber is 0.1-0.3 mm, and the tensile strength of the steel fiber is 2754-3154 MPa; the length of the PE fiber is 9-13 mm.
Preferably, the water reducing agent is a polycarboxylic acid water reducing agent with the water reducing rate of more than 30% and the solid content of less than 40%.
Preferably, the viscosity of the cellulose is 10 to 20 ten thousand.
A coordinated printing process of a high-toughness concrete 3D printing composite material comprises the following steps,
(1) preparation of conventional 3D printing concrete: mixing portland cement, sulphoaluminate cement, silica fume, fine aggregate and quartz sand according to corresponding weight parts to obtain a mixed material; mixing a water reducing agent with water according to corresponding weight parts to obtain a mixed solution; pre-stirring the obtained mixed material in a stirring pot, adding the mixed solution at a constant speed within a period of time, and stirring to obtain the conventional 3D printing concrete;
(2) preparation of high-toughness 3D printing concrete: mixing portland cement, sulphoaluminate cement, silica fume, fine aggregate and quartz sand according to corresponding weight parts to obtain a mixed material; mixing a water reducing agent, cellulose and water according to corresponding weight parts to obtain a mixed solution; pre-stirring the obtained mixed material in a stirring pot, then adding the mixed solution at a constant speed within a period of time, stirring, and finally uniformly adding the PE fibers and the steel fibers into the mixed material, and stirring to obtain the high-toughness 3D printing concrete;
(3) preparing a concrete 3D printing composite material: the regular 3D printing concrete and the high-toughness 3D printing concrete adopt an extrusion nozzle and a screw rod communicated with the extrusion nozzle to perform 3D printing, the extrusion nozzle is nested inside and outside, the screw rod is a hollow screw rod, and the extrusion nozzle of the high-toughness 3D printing concrete passes through the hollow screw rod of the regular 3D printing concrete.
Further, the conventional 3D printing concrete is arranged outside the high-toughness 3D printing concrete, and the extrusion speed ratio of the extrusion nozzle of the conventional 3D printing concrete and the high-toughness 3D printing concrete is the same as the area ratio of the internally and externally nested nozzles.
Therefore, the high-toughness 3D printing composite material for the concrete and the coordinated printing process thereof with the structure are adopted, the excellent mechanical toughness of the high-toughness 3D concrete material is used for toughening the conventional 3D printing concrete, and the difficult problem of material reinforcement under the condition that a reinforcing steel bar net rack is difficult to implant synchronously is solved; the preparation of the composite material is realized by the high-toughness 3D printing concrete and the conventional 3D printing material in a newly-mixed state, so that the problem of new and old interfaces of the material can be effectively avoided, and the cooperative bearing of the composite material is realized; the two materials are concrete materials, and compared with reinforced concrete materials, the two materials have more consistent properties, so that the problem of an interface caused by the physical difference of the two materials can be effectively avoided; high toughness 3D concrete increases tough conventional 3D and prints the concrete, has promoted the mechanical properties that 3D printed the concrete by a wide margin.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a three-dimensional schematic view of a high-toughness concrete 3D printed composite material according to the present invention;
FIG. 2 is a cross-sectional view of a high-toughness concrete 3D printed composite of the present invention;
FIG. 3 is a load-mid-span deflection curve of a finished high-toughness concrete 3D-printed composite provided in examples 1-3;
FIG. 4 is a load-mid-span deflection curve of a finished high-toughness concrete 3D printed composite material provided by a comparative example.
In the figure: 1. 3D printing the concrete with high toughness; 2. concrete was printed conventionally 3D.
Detailed Description
The present invention will be further described below, and it should be noted that the present embodiment is based on the technical solution, and a detailed implementation manner and a specific operation process are provided, but the present invention is not limited to the present embodiment.
Example 1
720 parts of portland cement, 80 parts of sulphoaluminate cement, 200 parts of silica fume and 1200 parts of quartz sand are mixed according to parts by weight to obtain a mixed material; according to the weight portion, 10 portions of water reducing agent, 3 portions of cellulose and 300 portions of water are mixed to obtain a mixed solution. Pre-stirring the obtained mixed material in a stirring pot for 2 minutes; then adding the mixed solution at a constant speed within 10s, and stirring for 10 minutes; and finally, uniformly adding 9 parts of PE fibers and 78 parts of steel fibers into the mixture and stirring for 2 minutes to obtain the high-toughness 3D printing concrete 1.
720 parts of portland cement, 80 parts of sulphoaluminate cement, 200 parts of silica fume and 1400 parts of quartz sand are mixed according to parts by weight to obtain a mixed material; and mixing 4 parts of water reducing agent and 350 parts of water according to parts by weight to obtain a mixed solution. Pre-stirring the obtained mixed material in a stirring pot for 2 minutes; and then adding the mixed solution at a constant speed within 10s, and stirring for 10 minutes to obtain the conventional 3D printing concrete 2.
3D printing is carried out on the high-toughness 3D printing concrete 1 and the conventional 3D printing concrete 2 through a special extrusion nozzle, the extrusion speed ratio of the extrusion nozzles of the conventional 3D printing concrete and the high-toughness 3D printing concrete is the same as the area ratio of the inner nested nozzle and the outer nested nozzle, the extrusion nozzles are nested inside and outside, the diameter of the built-in printing nozzle is set to be 2cm, the built-in printing nozzle is used for extruding the high-toughness 3D printing concrete 2, the diameter of the external printing nozzle is set to be 3cm, the conventional 3D printing concrete 1 is used for extruding the conventional 3D printing concrete 1, in order to ensure that the conventional 3D printing concrete 2 and the high-toughness printing concrete 1 are extruded simultaneously on the same cross section, reasonable printing parameters are set, the extrusion speed of the conventional 3D printing concrete 2 is 11.3L/min, and the extrusion speed of the high-toughness 3D printing concrete 1 is 7.3L/min for printing. The cross-sectional schematic diagram of the printed product is shown in fig. 2, and the mechanical property is characterized in fig. 3, namely example 1.
Example 2
Example 2 is different from example 1 in that "720 parts of portland cement and 80 parts of sulphoaluminate cement" in the high-toughness 3D printing concrete are replaced by "760 parts of portland cement and 40 parts of sulphoaluminate cement", and other steps are the same as those in example 1, so as to obtain the composite material of the invention. The composite material was printed using the 3D printing parameters of example 1 and the mechanical properties were characterized as in example 2 of fig. 3.
Example 3
Example 3 is different from example 1 in that "720 parts of portland cement and 80 parts of sulphoaluminate cement" in the high-toughness 3D printing concrete are replaced by "700 parts of portland cement and 100 parts of sulphoaluminate cement", and other steps are the same as those in example 1, so that the composite material of the invention is obtained. The composite material was printed using the 3D printing parameters of example 1 and the mechanical properties were characterized as in example 3 of fig. 3.
Comparative example
720 parts of portland cement, 80 parts of sulphoaluminate cement, 200 parts of silica fume and 1400 parts of quartz sand are mixed according to parts by weight to obtain a mixed material; and mixing 4 parts of water reducing agent and 350 parts of water according to parts by weight to obtain a mixed solution. Pre-stirring the obtained mixed material in a stirring pot for 2 minutes; and then adding the mixed solution at a constant speed within 10s, stirring for 10 minutes to obtain the conventional 3D printing concrete 2, printing the comparative example by adopting the 3D printing parameters in the example 1, and representing the mechanical properties of the comparative example shown in the figure 4.
From fig. 4, it can be seen that the 3D printing mechanical properties of the conventional 3D printed concrete material prepared by the same method as in example 1 in the comparative example are lower, while the load-mid-span deflection curve of the composite material provided in examples 1 to 3 of the present invention is significantly improved, and the composite material has the characteristics of high strength and high toughness. According to the invention, the high-toughness 3D concrete material is used for toughening the conventional 3D printing concrete by virtue of excellent mechanical toughness, so that the difficult problem of material reinforcement under the condition that a reinforcing steel bar net rack is difficult to implant synchronously is realized, and the defect of the conventional 3D printing in the aspect of mechanical property can be greatly improved.
Therefore, the high-toughness 3D printing composite material for the concrete and the coordinated printing process thereof with the structure are adopted, the excellent mechanical toughness of the high-toughness 3D concrete material is used for toughening the conventional 3D printing concrete, and the difficult problem of material reinforcement under the condition that a reinforcing steel bar net rack is difficult to implant synchronously is solved; the preparation of the composite material is realized by the high-toughness 3D printing concrete and the conventional 3D printing material in a newly-mixed state, so that the problem of new and old interfaces of the material can be effectively avoided, and the cooperative bearing of the composite material is realized; the two materials are concrete materials, and compared with reinforced concrete materials, the two materials have more consistent properties, so that the problem of an interface caused by the difference of the two materials can be effectively avoided; high toughness 3D concrete increases tough conventional 3D and prints the concrete, has promoted the mechanical properties that 3D printed the concrete by a wide margin.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the invention without departing from the spirit and scope of the invention.
Claims (10)
1. The high-toughness concrete 3D printing composite material is characterized in that: including conventional 3D printed concrete and high toughness 3D printed concrete,
the conventional 3D printing concrete comprises the following components in parts by weight:
710 to 730 parts of Portland cement,
70-90 parts of sulphoaluminate cement,
180-210 parts of silica fume,
300-1500 parts of quartz sand,
1000-2000 parts of fine aggregate,
4-10 parts of a water reducing agent,
350-450 parts of water;
the high-toughness 3D printing concrete comprises the following components in parts by weight:
680-720 parts of Portland cement,
60-80 parts of sulphoaluminate cement,
190-210 parts of silica fume,
330-1500 parts of quartz sand,
350-370 parts of fine aggregate,
7-10 parts of PE fiber,
70-80 parts of steel fiber,
8-22 parts of a water reducing agent,
1-3 parts of cellulose,
300-400 parts of water.
2. The high-toughness concrete 3D printing composite material according to claim 1, wherein: the strength grade of the portland cement is not lower than 42.5.
3. The high-toughness concrete 3D printing composite material according to claim 1, wherein: the sulphoaluminate cement is one or more of quick-hardening sulphoaluminate cement and high-strength sulphoaluminate cement.
4. The high-toughness concrete 3D printing composite material according to claim 1, wherein: the particle size of the silica fume is 0.2-35 mu m; the particle size of the quartz sand is 0.075-0.15 mm, and the bulk density of the quartz sand is 1430-1450 kg/m3。
5. The high-toughness concrete 3D printing composite material according to claim 1, wherein: the particle size of the fine aggregate is 0.15-0.3 mm, the fineness modulus is 1.8, and the bulk density is 1610-1630 kg/m3。
6. The high-toughness concrete 3D printing composite material according to claim 1, wherein: the length of the steel fiber is 9-15 mm, the diameter of the steel fiber is 0.1-0.3 mm, and the tensile strength of the steel fiber is 2754-3154 MPa; the length of the PE fiber is 9-13 mm.
7. The high-toughness concrete 3D printing composite material according to claim 1, wherein: the water reducing agent is a polycarboxylic acid water reducing agent with the water reducing rate of more than 30 percent and the solid content of less than 40 percent.
8. The high-toughness concrete 3D printing composite material according to claim 1, wherein: the viscosity of the cellulose is 10-20 ten thousand.
9. A coordinated printing process of the high toughness concrete 3D printing composite material as claimed in claims 1-8, wherein: comprises the following steps of (a) carrying out,
(1) preparation of conventional 3D printing concrete: mixing portland cement, sulphoaluminate cement, silica fume, fine aggregate and quartz sand according to corresponding weight parts to obtain a mixed material; mixing a water reducing agent with water according to corresponding weight parts to obtain a mixed solution; pre-stirring the obtained mixed material in a stirring pot, adding the mixed solution at a constant speed within a period of time, and stirring to obtain the conventional 3D printing concrete;
(2) preparation of high-toughness 3D printing concrete: mixing portland cement, sulphoaluminate cement, silica fume, fine aggregate and quartz sand according to corresponding weight parts to obtain a mixed material; mixing a water reducing agent, cellulose and water according to corresponding weight parts to obtain a mixed solution; pre-stirring the obtained mixed material in a stirring pot, then adding the mixed solution at a constant speed within a period of time, stirring, and finally uniformly adding the PE fibers and the steel fibers into the mixed material, and stirring to obtain the high-toughness 3D printing concrete;
(3) preparing a concrete 3D printing composite material: the regular 3D printing concrete and the high-toughness 3D printing concrete adopt an extrusion nozzle and a screw rod communicated with the extrusion nozzle to perform 3D printing, the extrusion nozzle is nested inside and outside, the screw rod is a hollow screw rod, and the extrusion nozzle of the high-toughness 3D printing concrete passes through the hollow screw rod of the regular 3D printing concrete.
10. The coordinated printing process of the high toughness concrete 3D printing composite material according to claim 9, wherein: the conventional 3D printing concrete is arranged outside the high-toughness 3D printing concrete, and the extrusion speed ratio of the extrusion nozzle of the conventional 3D printing concrete and the high-toughness 3D printing concrete is the same as the area ratio of the internally and externally nested nozzles.
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| CN116477903B (en) * | 2023-04-25 | 2024-05-31 | 河北工业大学 | 3D printing tough concrete of lining support structure and preparation method thereof |
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