CN115385635B - Lattice structure for cement composite material, cement composite material and preparation method of cement composite material - Google Patents
Lattice structure for cement composite material, cement composite material and preparation method of cement composite material Download PDFInfo
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- CN115385635B CN115385635B CN202211151561.2A CN202211151561A CN115385635B CN 115385635 B CN115385635 B CN 115385635B CN 202211151561 A CN202211151561 A CN 202211151561A CN 115385635 B CN115385635 B CN 115385635B
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- 239000004568 cement Substances 0.000 title claims abstract description 150
- 239000002131 composite material Substances 0.000 title claims abstract description 107
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 44
- 239000000835 fiber Substances 0.000 claims abstract description 21
- 229920005644 polyethylene terephthalate glycol copolymer Polymers 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000010146 3D printing Methods 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
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- 229910000831 Steel Inorganic materials 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 4
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- 239000004566 building material Substances 0.000 abstract description 2
- 210000004027 cell Anatomy 0.000 description 29
- 238000006073 displacement reaction Methods 0.000 description 11
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- 230000000052 comparative effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
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- 239000005020 polyethylene terephthalate Substances 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- -1 polypropylene Polymers 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002657 fibrous material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
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- 230000009286 beneficial effect Effects 0.000 description 1
- 210000005056 cell body Anatomy 0.000 description 1
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- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
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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
- C04B28/04—Portland 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
Abstract
The application provides a lattice structure for a cement composite material, the cement composite material and a preparation method thereof, and relates to the field of building materials. Because the PETG fiber has high toughness, the PETG fiber plays a good tensile role in cement components, greatly promotes the toughness enhancement and slows down the development of cracks. The lattice structure has high customization degree, and the lattice structures with different shapes can be designed and matched for the cement components with special shapes. Compared with the traditional continuous toughening material (such as steel bars, etc.), the continuous toughening material does not need cutting-off, welding, etc. processes, and is time-saving and labor-saving.
Description
Technical Field
The application relates to the field of building materials, in particular to a lattice structure for a cement composite material, the cement composite material and a preparation method of the lattice structure.
Background
At present, in general engineering practice, for the problem of natural brittleness of cement materials, high-toughness materials are generally adopted for toughening cement-based materials. The engineering adopts the following two toughening modes:
(1) By configuring the continuous high-toughness material. If the reinforced bars, FRP bars and the like are arranged in cement, corresponding cement composite materials (such as reinforced concrete materials) and the like are prepared, so that the toughening effect of the cement materials is realized.
(2) By doping the discrete fibers. If steel fiber, polypropylene (PP) fiber and Polyethylene (PE) fiber are mixed in cement base material, the corresponding fiber reinforced cement composite material is prepared to improve the toughness of cement material.
Although the above cement-based materials achieve a good cement-based toughening effect, the following disadvantages still exist:
(1) The degree of customization is low. At present, the existing continuous high-toughness materials are mostly produced in large scale by industrialization, the geometric dimensions and the like of the continuous high-toughness materials are very limited for standardized production products, and the continuous high-toughness materials aiming at special-shaped structures are less in development, higher in cost and cannot well adapt to diversified use requirements.
(2) Construction of discrete fibrous materials is difficult. The dispersion of discrete fibers in cement-based materials greatly affects the toughening effect, and the dispersion of fiber materials is difficult to control in actual construction. Second, excessive amounts of discrete fibers can further affect the practical properties of the cementitious material, such as flowability, pumpability, rheology, setting time, etc., which are detrimental to the practical application of the cementitious material.
Disclosure of Invention
The purpose of the application is to provide a cement composite material, and aims to solve the problems of low customization degree, difficult construction and poor dispersibility of the existing cement-based material although the existing cement-based material has a good cement-based toughening effect.
In order to achieve the above purpose, the application provides a lattice structure for a cement composite material, which comprises a plurality of lattice unit cells which are periodically and repeatedly arranged, wherein the lattice structure for the cement composite material is obtained by 3D printing of PETG fibers;
preferably, the lattice unit cell is a body centered cubic truss structure.
Preferably, the diameter of the framework of the lattice unit cell is 1.5-5.0 mm.
Preferably, the plurality of lattice unit cells arranged in a periodically repeating manner have the same diameter of the skeleton.
Preferably, the lattice unit of the tensile region of the lattice structure for cement composite material has a smaller dimensional length than the lattice unit of the compressive region of the lattice structure for cement composite material.
Preferably, the lattice unit cells of the tension zone have a dimensional length of 5mm by 5mm; the size length of the lattice unit cell of the pressed region is 10mm multiplied by 10mm.
Preferably, the framework of the lattice unit cell has a diameter of 2.5-3.5mm.
Preferably, the diameters of the skeletons of the plurality of lattice unit cells which are periodically and repeatedly arranged gradually decrease toward the same direction;
preferably, the diameter of the framework of the lattice unit cell is 1.5-2.5 mm.
The application also provides a cement composite material, which comprises a cement-based material and the lattice structure embedded in the cement-based material.
Preferably, the percentage of the volume of the lattice structure for the cement composite material to the volume of the cement composite material is 10% to 50%.
The application also provides a preparation method of the cement composite material, which comprises the following steps:
and compounding the lattice structure for the cement composite material with cement paste in a cement mold to obtain the cement composite material.
Compared with the prior art, the beneficial effects of this application include:
according to the lattice structure prepared by embedding PETG fibers into the cement-based material, chemical corrosion resistance, toughness and impact resistance of the cement-based material can be enhanced, and the high-toughness lattice structure cement composite material is prepared, so that the toughness of the cement composite material is increased by 2-3 times compared with that of the cement material without the lattice structure. Because the PETG fiber has high toughness, the PETG fiber plays a good tensile role in cement components, greatly promotes the toughness enhancement and slows down the development of cracks.
According to the scheme, the degree of customization of the lattice structure is high, the 3D printing technology is used for designing and manufacturing the multi-lattice structure, the flexibility in the design of the lattice structure is realized, and the lattice structure with different shapes can be designed and matched for the cement component with the special shape. Compared with the traditional continuous toughening material (such as steel bars, etc.), the continuous toughening material does not need cutting-off, welding, etc. processes, and is time-saving and labor-saving.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate certain embodiments of the present application and therefore should not be considered as limiting the scope of the present application.
FIG. 1 is a schematic perspective view of the lattice structure for cement composite materials of example 1;
FIG. 2 is a front view of the lattice structure for cement composite materials of example 1;
FIG. 3 is a side view of the lattice structure for cement composite materials of example 1;
FIG. 4 is a schematic perspective view of the cement composite material of example 1;
FIG. 5 is a force-displacement plot of the cement composite of example 1;
FIG. 6 is a graph of crack failure mode and strain distribution results for the cement composite of example 1;
FIG. 7 is a schematic perspective view of the lattice structure for cement composite materials of example 2;
FIG. 8 is a front view of the lattice structure for cement composite materials of example 2;
FIG. 9 is a side view of the lattice structure for cement composite materials of example 2;
FIG. 10 is a schematic perspective view of the cement composite material of example 2;
FIG. 11 is a force-displacement plot of the cement composite of example 2;
FIG. 12 is a graph of crack failure mode and strain distribution results for the cement composite of example 2;
FIG. 13 is a schematic perspective view of the lattice structure for cement composite materials of example 3;
FIG. 14 is a front view showing the lattice structure for cement composite materials of example 3;
FIG. 15 is a side view of the lattice structure for cement composite materials of example 3;
FIG. 16 is a schematic perspective view of the cement composite material of example 3;
FIG. 17 is a force-displacement plot of the cement composite of example 3;
FIG. 18 is a graph of crack failure mode and strain distribution results for the cement composite of example 3;
FIG. 19 is a schematic perspective view of the lattice structure for cement composite materials of example 4;
FIG. 20 is a front view of the lattice structure for cement composite materials of example 4;
FIG. 21 is a side view of the lattice structure for cement composite materials of example 4;
FIG. 22 is a schematic perspective view of the cement composite material of example 4;
FIG. 23 is a force-displacement plot of the cement composite of example 4;
FIG. 24 is a graph of crack failure mode and strain distribution results for the cement composite of example 4;
FIG. 25 is a force-displacement plot of the cement composite of comparative example 1;
FIG. 26 is a graph of crack failure mode and strain distribution results for the cement composite of comparative example 1;
FIG. 27 is a schematic view of a lattice unit cell-centered cubic truss structure of the lattice structure of the present embodiment.
Detailed Description
The term as used herein:
"prepared from … …" is synonymous with "comprising". The terms "comprising," "including," "having," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, step, method, article, or apparatus.
The conjunction "consisting of … …" excludes any unspecified element, step or component. If used in a claim, such phrase will cause the claim to be closed, such that it does not include materials other than those described, except for conventional impurities associated therewith. When the phrase "consisting of … …" appears in a clause of the claim body, rather than immediately following the subject, it is limited to only the elements described in that clause; other elements are not excluded from the stated claims as a whole.
When an equivalent, concentration, or other value or parameter is expressed as a range, preferred range, or a range bounded by a list of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when ranges of "1 to 5" are disclosed, the described ranges should be construed to include ranges of "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a numerical range is described herein, unless otherwise indicated, the range is intended to include its endpoints and all integers and fractions within the range.
In these examples, the parts and percentages are by mass unless otherwise indicated.
"parts by mass" means a basic unit of measurement showing the mass ratio of a plurality of components, and 1 part may be any unit mass, for example, 1g may be expressed, 2.689g may be expressed, and the like. If we say that the mass part of the a component is a part and the mass part of the B component is B part, the ratio a of the mass of the a component to the mass of the B component is represented as: b. alternatively, the mass of the A component is aK, and the mass of the B component is bK (K is an arbitrary number and represents a multiple factor). It is not misunderstood that the sum of the parts by mass of all the components is not limited to 100 parts, unlike the parts by mass.
"and/or" is used to indicate that one or both of the illustrated cases may occur, e.g., a and/or B include (a and B) and (a or B).
The application provides a lattice structure for a cement composite material, which comprises a plurality of lattice unit cells which are periodically and repeatedly arranged, wherein the lattice structure for the cement composite material is obtained by 3D printing of PETG fibers.
The lattice structure is a periodic porous structure, and it can be considered that a large number of identical lattice cells are formed by periodically arranging and combining in some form. The performance of the lattice structure has high design flexibility, and the perfect balance of the strength, the rigidity, the toughness, the durability, the statics performance and the dynamics performance of the structure is achieved by adjusting the relative density of the lattice, the configuration of unit cells and the size of the connecting rod. The mechanical properties of the cement material can be greatly enhanced by adding the lattice structure into the cement material.
The lattice structure for the cement composite material is obtained by 3D printing of PETG fiber, so that the lattice structure with any shape can be obtained by printing, the customization degree of the lattice structure for the cement composite material is high, and cement components with various shapes can be obtained.
Wherein, PETG is the copolymer of PET, also called non-crystallization poly (ethylene terephthalate), is a thermal shrinkage polyester film, PET is poly (ethylene terephthalate) (polyethylene terephthalate), PETG fiber is more alkali-proof, and the ability of resisting the alkaline corrosion of cement is stronger.
Constrained by the 3D printing process, the lattice unit cell configuration is preferably such that no transverse bars are present. Lattice unit cell configurations suitable for 3D printing are mainly Body Centered Cubic (BCC) and Face Centered Cubic (FCC) structures, as well as deformed structures of both.
Preferably, the lattice unit cell is a body centered cubic truss structure.
The body-centered cubic structure is a bending dominant structure and is characterized by strong energy absorbing capacity and is suitable for designing impact resistant structures. The main advantage is that it exhibits high strength over a wide temperature range and under a large strain state.
Fig. 27 is a schematic diagram of a lattice unit cell body-centered cubic truss structure of the lattice structure according to the present application, where the body-centered cubic truss structure is formed by intersecting four frameworks b at a central point, so that eight vertices of the four frameworks b are respectively located at eight vertices of a square shape on the outer shape of the body-centered cubic truss structure, and the intersecting point of the four frameworks b is located at the center of the square. The dimensions of the lattice unit cell body centered cubic truss structure refer to the side lengths of the cubes, a x a.
Preferably, the framework of the lattice unit cell has a diameter of 1.5 to 5.0mm, for example, 1.5 to 2.5mm, or 2.5 to 3.5mm, or 2.5 to 4.0, or 3.0 to 5.0mm, more specifically, for example, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, or 5.0mm. The diameter of the framework of the lattice unit cell can be identical or gradually changed.
In a preferred embodiment, the plurality of periodically repeating arranged lattice unit cells have the same diameter of the framework.
Preferably, the lattice unit of the tensile region of the lattice structure for cement composite material has a smaller dimensional length than the lattice unit of the compressive region of the lattice structure for cement composite material.
Wherein, definition of the tensile area and the compression area of the lattice structure for the cement composite material is as follows: when the lattice structure for the cement composite material is bent at three points, one side where extension occurs is a tension area, and the other side where compression occurs is a compression area.
Preferably, the lattice unit cells of the tension zone have a dimensional length of 5mm by 5mm; the size length of the lattice unit cell of the pressed region is 10mm multiplied by 10mm.
Preferably, the diameter of the framework of the lattice unit cell is 2.5-3.5mm.
Preferably, the diameter of the skeletons of the plurality of lattice unit cells arranged periodically and repeatedly gradually decreases toward the same direction. The lattice structure for the cement composite material has small diameter of the compression area and large diameter of the tension area.
Preferably, the diameter of the framework of the lattice unit cell is 1.5-2.5 mm.
According to the lattice structure prepared by embedding PETG fibers into the cement-based material, the toughness of the cement-based material can be enhanced, and the high-toughness lattice structure cement composite material is prepared, so that the toughness of the cement composite material is increased by 2-3 times compared with the cement material without the lattice structure. Because the PETG fiber has high toughness, the PETG fiber plays a good tensile role in cement components, greatly promotes the toughness enhancement and slows down the development of cracks.
According to the scheme, the degree of customization of the lattice structure is high, the 3D printing technology is used for designing and manufacturing the multi-lattice structure, the flexibility in the design of the lattice structure is realized, and the lattice structure with different shapes can be designed and matched for the cement component with the special shape. Compared with the traditional continuous toughening material (such as steel bars, etc.), the continuous toughening material does not need cutting-off, welding, etc. processes, and is time-saving and labor-saving.
The application also provides a cement composite material, which comprises a cement-based material and the lattice structure embedded in the cement-based material.
Preferably, the percentage of the volume of the lattice structure for the cement composite material to the volume of the cement composite material is 10% to 50%, for example, may be 10% to 30%, or 20% to 40%, more specifically, for example, may be 10%, 20%, 30%, 40% or 50%.
The application also provides a preparation method of the cement composite material, which comprises the following steps:
and compounding the lattice structure for the cement composite material with cement paste in a cement mold to obtain the cement composite material.
Embodiments of the present application will be described in detail below with reference to specific examples, but it will be understood by those skilled in the art that the following examples are only for illustration of the present application and should not be construed as limiting the scope of the present application. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Example 1
A cement base material: ordinary Portland cement.
Toughening material: PETG fiber, diameter of 1.75mm, tensile strength of 49MPa, melting point of 230 ℃.
A printer: a thermoset Fused (FDM) 3D printer.
The lattice structure for the cement composite material of example 1 is shown in fig. 1 to 3, the shape of lattice unit cell is a body-centered cubic truss structure, the diameter of each side of the lattice unit cell is 1.5mm, and the preparation process of the cement composite material of example 1 is as follows:
printing out the lattice structure for the cement composite material of example 1 using a thermoset Fused Deposition (FDM) 3D printer;
placing the printed lattice structure in a hexahedral cement mold with 40 x 160 mm;
preparing cement paste, slowly injecting the cement paste into a mold, and vibrating the cement paste on a vibrating table until the cement paste is compact;
after 24 hours, the cement composite material of example 1 was obtained by demolding and then curing for 28 days under laboratory conditions, as shown in fig. 4.
A three-point bending experiment was performed on the cement composite material of example 1, and a force-displacement curve was recorded as shown in fig. 5.
The fracture failure mode and strain distribution of the cement composite of example 1 were recorded under a high speed camera and Digital Image Correlation (DIC) instrument, as shown in fig. 6.
Example 2
Unlike example 1, the lattice structure for the cement composite material of example 2 is shown in FIGS. 7 to 9, and the diameters of the sides of the lattice unit cells are the same 2.5mm.
The resulting cement composite material of example 2 is shown in fig. 10.
A three-point bending experiment was performed on the cement composite material of example 2, and a force-displacement curve was recorded as shown in fig. 11.
The fracture failure mode and strain distribution of the cement composite of example 2 were recorded under a high speed camera and Digital Image Correlation (DIC) instrument, as shown in fig. 12.
Example 3
Unlike example 1, the lattice structure for the cement composite material of example 3 is shown in FIGS. 13 to 15, in which the diameter of the sides of the lattice unit cell is gradually reduced from 2.5mm to 1.5mm in the same direction.
The resulting cement composite material of example 3 is shown in fig. 16.
A three-point bending experiment was performed on the cement composite material of example 3, and a force-displacement curve was recorded as shown in fig. 17.
The fracture failure mode and strain distribution of the cement composite of example 3 were recorded under a high speed camera and Digital Image Correlation (DIC) instrument, as shown in fig. 18.
Example 4
Unlike example 1, the cement composite material of example 4 has a lattice structure as shown in FIGS. 19 to 21, the sides of the lattice unit cell having a diameter of 2.5mm, and the lattice is encrypted in the tension zone.
The resulting cement composite material of example 4 is shown in fig. 22.
A three-point bending experiment was performed on the cement composite material of example 4, and a force-displacement curve was recorded as shown in fig. 23.
The fracture failure mode and strain distribution of the cement composite of example 4 were recorded under a high speed camera and Digital Image Correlation (DIC) instrument, as shown in fig. 24.
Comparative example 1
Unlike example 1, the cement material of comparative example 1 was not embedded in the lattice structure.
The cement material of comparative example 1 was subjected to a three-point bending test, and a force-displacement curve was recorded as shown in fig. 25.
The fracture failure mode and strain distribution of the cement material of comparative example 1 were recorded under a high-speed camera and Digital Image Correlation (DIC) instrument, as shown in fig. 26.
The geometric characteristics of the lattice structure for cement composite materials of each example are shown in table 1.
TABLE 1 geometric features of lattice structures
From the force-displacement curve results of the examples and comparative examples, it is understood that the lattice toughened cement composite material has a different degree of increase in both ultimate tensile strength and deformability as compared to the non-lattice cement material, wherein the toughness is enhanced by a maximum of about 3 times, and wherein the uniform lattice structure having a diameter of 2.5mm is the best in toughening effect.
From the fracture failure mode and strain distribution results recorded under high-speed cameras and digital image related instruments, the cement component without lattice structure exhibits a typical brittle failure mode, has only one main fracture, and rapidly expands to failure. And for the lattice toughened cement composite material, the composite material presents a multi-crack damage mode, which indicates that the composite material is in a plastic damage mode, namely the toughness of the composite material is obviously improved. Wherein, the uniform lattice structure with the diameter of 2.5mm has the best effect; the effect of a uniform lattice structure with a diameter of 1.5mm is the worst.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the present application and form different embodiments. For example, in the claims below, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Claims (7)
1. The lattice structure for the cement composite material is characterized by comprising a plurality of lattice unit cells which are periodically and repeatedly arranged, wherein the lattice structure for the cement composite material is obtained by 3D printing of PETG fibers;
the lattice unit cell is a body-centered cubic truss structure, and the body-centered cubic truss structure is formed by intersecting four frameworks at a central point, so that eight vertexes of the four frameworks are respectively positioned at eight vertexes of a cube shape on the appearance of the body-centered cubic truss structure, and the intersecting points of the four frameworks are positioned at the center of the cube;
the diameter of the framework of the lattice unit cell is 1.5-5.0 mm;
the size length of lattice unit cells of a tension zone of the lattice structure for the cement composite material is smaller than that of lattice unit cells of a compression zone of the lattice structure for the cement composite material;
the length of the lattice unit cell of the tension zone is 5mm multiplied by 5mm; the size length of lattice unit cells of the pressed region is 10mm multiplied by 10mm;
the diameters of the frameworks of the lattice unit cells which are periodically and repeatedly arranged gradually decrease towards the same direction.
2. The lattice structure for cement composite materials according to claim 1, wherein the skeletons of the plurality of lattice unit cells arranged in a periodic repeating manner have the same diameter.
3. The lattice structure for cement composite materials according to claim 2, wherein the diameter of the framework of lattice unit cell is 2.5-3.5mm.
4. The lattice structure for cement composite materials according to claim 1, wherein,
the diameter of the framework of the lattice unit cell is 1.5-2.5 mm.
5. A cementitious composite comprising a cementitious material and a lattice structure for cementitious composites as claimed in any one of claims 1 to 4 embedded in said cementitious material.
6. The cement composite material according to claim 5, wherein the percentage of the volume of the lattice structure for cement composite material to the volume of the cement composite material is 10% to 50%.
7. A method of preparing a cementitious composite as claimed in claim 5 or 6, comprising:
and compounding the lattice structure of the cement composite material with cement paste in a cement mold to obtain the cement composite material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211151561.2A CN115385635B (en) | 2022-09-21 | 2022-09-21 | Lattice structure for cement composite material, cement composite material and preparation method of cement composite material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211151561.2A CN115385635B (en) | 2022-09-21 | 2022-09-21 | Lattice structure for cement composite material, cement composite material and preparation method of cement composite material |
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| CN115385635A CN115385635A (en) | 2022-11-25 |
| CN115385635B true CN115385635B (en) | 2024-03-08 |
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| CN111485667A (en) * | 2019-01-25 | 2020-08-04 | 杨猛 | 3d printing customized building block brick and method for building complex wall body by same |
| CN113816676A (en) * | 2021-09-06 | 2021-12-21 | 青岛理工大学 | Negative Poisson's ratio cement-based composite material and preparation method thereof |
| CN114507035A (en) * | 2022-01-14 | 2022-05-17 | 扬州大学 | 3D printing grid reinforced cement-based composite material and preparation method thereof |
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|---|---|---|---|---|
| CN111485667A (en) * | 2019-01-25 | 2020-08-04 | 杨猛 | 3d printing customized building block brick and method for building complex wall body by same |
| CN113816676A (en) * | 2021-09-06 | 2021-12-21 | 青岛理工大学 | Negative Poisson's ratio cement-based composite material and preparation method thereof |
| CN114507035A (en) * | 2022-01-14 | 2022-05-17 | 扬州大学 | 3D printing grid reinforced cement-based composite material and preparation method thereof |
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| 曹国强.《工程训练教程》.北京理工大学出版社,2019,第168-169页. * |
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