CN115385635A - Lattice structure for cement composite material, cement composite material and preparation method thereof - Google Patents
Lattice structure for cement composite material, cement composite material and preparation method thereof Download PDFInfo
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- CN115385635A CN115385635A CN202211151561.2A CN202211151561A CN115385635A CN 115385635 A CN115385635 A CN 115385635A CN 202211151561 A CN202211151561 A CN 202211151561A CN 115385635 A CN115385635 A CN 115385635A
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- 239000004568 cement Substances 0.000 title claims abstract description 162
- 239000002131 composite material Substances 0.000 title claims abstract description 115
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 47
- 239000000835 fiber Substances 0.000 claims abstract description 22
- 229920005644 polyethylene terephthalate glycol copolymer Polymers 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 11
- 230000006835 compression Effects 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 9
- 238000010146 3D printing Methods 0.000 claims description 8
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 abstract description 3
- 238000011161 development Methods 0.000 abstract description 3
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- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 239000004566 building material Substances 0.000 abstract description 2
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- 238000006073 displacement reaction Methods 0.000 description 11
- 238000009826 distribution Methods 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000002585 base Substances 0.000 description 6
- 230000000737 periodic effect Effects 0.000 description 6
- 238000013001 point bending Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- -1 polypropylene Polymers 0.000 description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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- 229920001155 polypropylene Polymers 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 229920008790 Amorphous Polyethylene terephthalate Polymers 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
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- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Composite Materials (AREA)
- Manufacturing & Machinery (AREA)
- Panels For Use In Building Construction (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application provides a lattice structure for cement composite material, cement composite material and a preparation method thereof, relates to the field of building materials, and the cement composite material is embedded into a lattice structure prepared from PETG fibers in a cement-based material, so that the toughness of the cement-based material can be enhanced, the high-toughness lattice structure cement composite material is prepared, and compared with a cement material without a lattice structure, the toughness of the cement composite material in the scheme is increased by 2-3 times. Because the used PETG fiber has high toughness, the PETG fiber plays a good tensile action in a cement component, greatly promotes the toughness enhancement of the cement component and slows down the development of cracks. The lattice structure has high customization degree, and lattice structures with different shapes can be designed to be matched with cement components with special shapes. Compared with the traditional continuous toughening material (such as steel bars and the like), the process of cutting off, welding and the like is not needed, and time and labor are saved.
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 thereof.
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 following two toughening modes are adopted in the engineering:
(1) By arranging the continuous high-toughness material. For example, reinforcing steel bars, FRP bars and the like are arranged in cement to prepare corresponding cement composite materials (such as reinforced concrete materials) and the like so as to realize the toughening effect of the cement materials.
(2) By doping discrete fibers. For example, steel fibers, polypropylene (PP) fibers and Polyethylene (PE) fibers are added into a cement base material to prepare a corresponding fiber reinforced cement composite material so as to improve the toughness of the cement material.
Although the cement-based materials achieve better cement-based toughening effect, the following disadvantages still exist:
(1) The degree of customization is low. At present, most of the existing continuous high-toughness materials are produced industrially on a large scale, the materials are standardized production products, the geometric sizes and the like of the materials are very limited, and the materials are developed less aiming at toughening materials with special-shaped structures, have higher cost and cannot well adapt to diversified use requirements.
(2) Construction of discrete fiber materials is difficult. The dispersion of the discrete fibers in the cement-based material can greatly influence the toughening effect of the cement-based material, and the dispersion of the fiber material in actual construction is difficult to control. Secondly, excessive amounts of discrete fibers can further affect the use properties of the cementitious material, such as flowability, pumpability, rheology, setting time, etc., which is detrimental to the practical application of the cementitious material.
Disclosure of Invention
The application aims to provide a cement composite material, which aims to solve the problems of low customization degree, difficult construction and poor dispersibility of the existing cement-based materials although the existing cement-based materials have better cement-based toughening effect.
In order to achieve the above purpose, the present application provides a lattice structure for cement composite material, which comprises a plurality of lattice unit cells periodically and repeatedly arranged, wherein the lattice structure for 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 skeletons of the lattice unit cells arranged in periodic repetition have the same diameter.
Preferably, the dimension length of the lattice unit cell of the tension area of the lattice structure for the cement composite material is smaller than the dimension length of the lattice unit cell of the compression area of the lattice structure for the cement composite material.
Preferably, the dimension length of the lattice unit cell of the tension area is 5mm multiplied by 5mm; the dimension length of the lattice unit cell of the compression area is 10mm multiplied by 10mm.
Preferably, the diameter of the framework of the lattice unit cell is 2.5-3.5mm.
Preferably, the diameters of the skeletons of the lattice unit cells in the periodic repeated arrangement gradually decrease towards 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 above lattice structure for the cement composite material 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 and the cement paste in a cement mould to obtain the cement composite material.
Compared with the prior art, the beneficial effect of this application includes:
the application provides a cement composite imbeds the lattice structure that PETG fibre preparation obtained in cement base material, can strengthen the chemical corrosion resistance, toughness and the shock resistance of cement base material, prepares out lattice structure cement composite of high toughness, compares in the cement material that does not have lattice structure, and the toughness of the cement composite of this scheme has increased 2-3 times. Because the used PETG fiber has high toughness, the PETG fiber plays a good tensile role in a cement component, greatly promotes the toughness enhancement and slows down the development of cracks.
The lattice structure customization degree of this application scheme is high, with the help of 3D printing technique, designs and makes multiple dot matrix structure, has realized the flexibility in the lattice structure design, to the cement component of special shape, can design the lattice structure of different shapes and match with it. Compared with the traditional continuous toughening material (such as reinforcing steel bars and the like), processes such as cutting and welding are not needed, and time and labor are saved.
Drawings
To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments are briefly described below, and it should be understood that the following drawings only illustrate some 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 a lattice structure for a cement composite material of example 1;
FIG. 2 is a front view of a lattice structure for a cement composite of example 1;
FIG. 3 is a side view of a lattice structure for a cement composite of example 1;
FIG. 4 is a schematic perspective view of a cement composite of example 1;
FIG. 5 is a force-displacement graph of the cement composite of example 1;
FIG. 6 is a graph showing the results of fracture failure mode and strain distribution for the cementitious composite of example 1;
FIG. 7 is a schematic perspective view showing a lattice structure for a cement composite of example 2;
FIG. 8 is a front view of a lattice structure for a cement composite of example 2;
FIG. 9 is a side view of a lattice structure for a cement composite of example 2;
FIG. 10 is a schematic perspective view of a cement composite of example 2;
FIG. 11 is a force-displacement graph of the cement composite of example 2;
FIG. 12 is a graph showing the results of fracture failure mode and strain distribution for the cementitious composite of example 2;
FIG. 13 is a schematic perspective view showing a lattice structure for a cement composite according to example 3;
FIG. 14 is a front view of a lattice structure for a cement composite of example 3;
FIG. 15 is a side view of a lattice structure for a cement composite of example 3;
FIG. 16 is a schematic perspective view of a cement composite of example 3;
FIG. 17 is a force-displacement graph of the cement composite of example 3;
FIG. 18 is a graph showing the results of fracture failure mode and strain distribution for the cementitious composite of example 3;
FIG. 19 is a schematic perspective view of a lattice structure for a cement composite of example 4;
FIG. 20 is a front view of a lattice structure for a cement composite of example 4;
FIG. 21 is a side view of a lattice structure for a cement composite of example 4;
FIG. 22 is a schematic perspective view of a cement composite of example 4;
FIG. 23 is a force-displacement graph of the cementitious composite of example 4;
FIG. 24 is a graph showing the results of fracture failure mode and strain distribution for the cementitious composite of example 4;
FIG. 25 is a force-displacement plot of the cement composite of comparative example 1;
FIG. 26 is a graph showing the results of fracture failure mode and strain distribution of the cement composite of comparative example 1;
fig. 27 is a schematic diagram of a lattice unit cell-centered cubic truss structure of the lattice structure of the present application.
Detailed Description
The term as used herein:
"by 8230; \ 8230; preparation" is synonymous with "comprising". As used herein, the terms "comprises," "comprising," "includes," "including," "has," "having," "contains" or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, 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, process, method, article, or apparatus.
The conjunction "consisting of 823070, 8230composition" excludes any unspecified elements, steps or components. If used in a claim, the phrase is intended to claim as closed, meaning that it does not contain materials other than those described, except for the conventional impurities associated therewith. When the phrase "consisting of (8230) \8230; occurs in a clause of the subject matter of the claims rather than immediately after the subject matter, it only defines the elements described in the clause; no other elements are excluded from the claims as a whole.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or range defined 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 a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4," "1 to 3," "1 to 2 and 4 to 5," "1 to 3 and 5," and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
In the examples, the parts and percentages are by mass unless otherwise indicated.
"part by mass" means a basic unit of measure indicating a mass ratio of a plurality of components, and 1 part may represent an arbitrary unit mass, for example, 1g or 2.689 g. If we say that the part by mass of the component A is a part by mass and the part by mass of the component B is B part by mass, the ratio of the part by mass of the component A to the part by mass of the component B is a: 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 to be misunderstood that the sum of the parts by mass of all the components is not limited to the limit of 100 parts, unlike the parts by mass.
"and/or" is used to indicate that one or both of the illustrated conditions may occur, e.g., a and/or B includes (a and B) and (a or B).
The application provides a lattice structure for cement composite, including the lattice unit cell of a plurality of periodic repetitive row, lattice structure for cement composite is obtained through 3D printing by the PETG fibre.
The lattice structure is a periodic porous structure, and can be considered as a structure in which a large number of identical lattice unit cells are arranged and combined periodically in some form. The performance of the lattice structure has high design flexibility, and the perfect balance of the strength, rigidity, toughness, durability, static performance and dynamic performance of the structure is achieved by adjusting the relative density of the lattice, the configuration of the unit cell and the size of the connecting rod. The mechanical property 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 fibers, so that the lattice structure in any shape can be obtained by printing, the customization degree of the lattice structure for the cement composite material is high, and cement components in various shapes can be obtained.
The PETG is a copolymer of PET, namely amorphous polyethylene terephthalate, and is a heat-shrinkable polyester film, the PET is polyethylene terephthalate (polyethylene terephthalate), and the PETG fiber is more alkali-resistant and has stronger capability of resisting alkali corrosion of cement.
Constrained by the 3D printing process, the lattice unit cell configuration preferably does not have a cross-bar. Lattice unit cell configurations suitable for 3D printing are mainly Body Centered Cubic (BCC) and Face Centered Cubic (FCC) structures, and their deformed structures.
Preferably, the lattice unit cell is a body-centered cubic truss structure.
The body-centered cubic structure is a bending leading structure, and is characterized by strong energy absorption capacity and suitability for designing an impact-resistant structure. The most important advantage is that it exhibits high strength over a wide temperature range and under a large strain.
Fig. 27 is a schematic diagram of a lattice unit body-centered cubic truss structure of a lattice structure according to the present invention, where the body-centered cubic truss structure is formed by intersecting four skeletons b at a central point, so that eight vertexes of the four skeletons b are located at eight vertexes of a cube shape, respectively, and the intersection point of the four skeletons b is located at the center of the cube. The dimensions of the lattice unit cell-centered cubic truss structure refer to the side length a × a × a of the cube.
Preferably, the backbone of the lattice unit has a diameter of 1.5 to 5.0mm, such as 1.5 to 2.5mm, or 2.5 to 3.5mm, or 2.5 to 4.0, or 3.0 to 5.0mm, more particularly such as 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, or 5.0mm. The diameter of the skeleton of the lattice unit cell can be completely the same or gradually changed.
In a preferred embodiment, the skeletons of the lattice unit cells arranged in periodic repetition have the same diameter.
Preferably, the dimension length of the lattice unit cell of the tension area of the lattice structure for the cement composite material is smaller than the dimension length of the lattice unit cell of the compression area of the lattice structure for the cement composite material.
Wherein, the definition of the tension 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 surface where elongation occurs is a tension area, and the other surface where compression occurs is a compression area.
Preferably, the dimension length of the lattice unit cell of the tension area is 5mm multiplied by 5mm; the dimension length of the lattice unit cell of the compression area 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 lattice unit cells in the periodic repeated arrangement gradually decreases towards the same direction. The lattice structure for cement composite material has small compression area diameter and large tension area diameter.
Preferably, the diameter of the framework of the lattice unit cell is 1.5-2.5 mm.
The application provides a cement composite imbeds the lattice structure that PETG fibre preparation obtained in cement base material, can strengthen the toughness of cement base material, prepares out the lattice structure cement composite of high toughness, compares in the cement material that does not have lattice structure, and the toughness of the cement composite of this scheme has increased 2-3 times. Because the used PETG fiber has high toughness, the PETG fiber plays a good tensile role in a cement component, greatly promotes the toughness enhancement and slows down the development of cracks.
The lattice structure customization degree of this application scheme is high, with the help of 3D printing technique, designs and makes multiple dot matrix structure, has realized the flexibility in the lattice structure design, to the cement component of special shape, can design the lattice structure of different shapes and match with it. Compared with the traditional continuous toughening material (such as reinforcing steel bars and the like), processes such as cutting and welding are not needed, and time and labor are saved.
The application also provides a cement composite material, which comprises a cement-based material and the lattice structure for the cement composite material 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 10% to 30%, or 20% to 40%, more specifically 10%, 20%, 30%, 40% or 50%, for example.
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 and the cement paste in a cement mould to obtain the cement composite material.
Embodiments of the present application will be described in detail below with reference to specific examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present application and should not be construed as limiting the scope of the present application. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1
Cement base material: ordinary portland cement.
Toughening materials: PETG fiber with the diameter of 1.75mm, tensile strength of 49MPa and melting point of 230 ℃.
A printer: a thermoset melt (FDM) 3D printer.
The lattice structure for cement composite material of example 1 is shown in fig. 1 to 3, the lattice unit thereof is in the shape of a body-centered cubic truss structure, the diameter of each side of the lattice unit is the same 1.5mm, and the preparation process of the cement composite material of example 1 is as follows:
printing the lattice structure for the cement composite material of example 1 by using a thermosetting melting type (FDM) 3D printer;
placing the printed lattice structure in a 40 × 160mm hexahedral cement mold;
preparing cement paste, slowly injecting the cement paste into a mold, and vibrating the mold on a vibrating table until the cement paste is dense;
after 24 hours, the cement composite of example 1 was obtained by demolding and then curing under laboratory conditions for 28 days, as shown in FIG. 4.
A three-point bending test was performed on the cement composite of example 1 and the 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 cement composite of example 2 is shown in fig. 7 to 9, and the sides of the lattice unit have the same diameter of 2.5mm.
The resulting cement composite of example 2 is shown in FIG. 10.
A three-point bending test was performed on the cement composite of example 2 and the 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 figure 12.
Example 3
Unlike example 1, the lattice structure for cement composite of example 3 is shown in fig. 13 to 15, and the diameter of the sides of the lattice unit is gradually decreased from 2.5mm to 1.5mm in the same direction.
The resulting cement composite of example 3 is shown in FIG. 16.
A three-point bending test was performed on the cement composite 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 of example 4 has a lattice structure as shown in FIGS. 19 to 21, in which the side of lattice unit has a diameter of 2.5mm and the lattice is densified in the tension zone.
The resulting cement composite of example 4 is shown in FIG. 22.
A three-point bending test was performed on the cement composite 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 figure 24.
Comparative example 1
Unlike example 1, the cement material of comparative example 1 was not embedded in a lattice structure.
The cement material of comparative example 1 was subjected to a three-point bending test and the 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 geometrical characteristics of the lattice structure for the cement composite material of each example are shown in table 1.
TABLE 1 lattice structure geometry
According to the force-displacement curve results of each example and comparative example, the ultimate tensile strength and deformability of the lattice toughened cement composite material are increased to different degrees compared with the lattice-free cement material, wherein the toughness of the lattice-toughened cement composite material is enhanced by about 3 times at most, and the toughening effect of the uniform lattice structure with the diameter of 2.5mm is the best.
From the fracture failure mode and strain distribution results recorded under the high-speed camera and the digital image related instrument, the cement member without the lattice structure presents a typical brittle failure mode, only has one main fracture and rapidly expands to failure. And for the lattice toughened cement composite material, a multi-crack failure mode is presented, which indicates that the composite material is a plastic failure mode, namely the toughness of the composite material is obviously improved. Wherein, the effect of the uniform lattice structure with the diameter of 2.5mm is best; 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 used for illustrating the technical solutions 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 solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Moreover, those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims above, 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 that is already known to a person skilled in the art.
Claims (10)
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;
preferably, the lattice unit cell is a body-centered cubic truss structure.
2. The lattice structure for cement composite according to claim 1, wherein the lattice unit cell has a skeleton with a diameter of 1.5 to 5.0mm.
3. The lattice structure for cement composite according to claim 2, wherein the skeletons of the lattice unit cells arranged periodically and repeatedly have the same diameter.
4. The lattice structure for cement composite according to claim 3, wherein the dimensional length of lattice unit cells of the tensile region of the lattice structure for cement composite is smaller than the dimensional length of lattice unit cells of the compressive region of the lattice structure for cement composite.
5. The lattice structure for cement composite according to claim 4, wherein the lattice unit cell size length of the tension zone is 5mm x 5mm; the dimension length of the lattice unit cell of the compression area is 10mm multiplied by 10mm.
6. The lattice structure for cement composite according to claim 3 or 4, wherein the lattice unit cell has a skeleton with a diameter of 2.5 to 3.5mm.
7. The lattice structure for cement composite according to claim 2, wherein the skeletons of the lattice unit cells arranged periodically and repeatedly have diameters gradually decreasing toward the same direction;
preferably, the diameter of the framework of the lattice unit cell is 1.5-2.5 mm.
8. A cement composite material comprising a cement-based material and the lattice structure for cement composite material of any one of claims 1 to 7 embedded in the cement-based material.
9. The cement composite according to claim 8, wherein the percentage of the volume of the lattice structure for the cement composite to the volume of the cement composite is 10% to 50%.
10. A method of preparing a cementitious composite as claimed in claim 8 or 9, comprising:
the cement composite material is obtained by combining the lattice structure for cement composite material of any one of claims 1 to 7 with cement paste in a cement mold.
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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| 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 |
| US20200331165A1 (en) * | 2017-10-31 | 2020-10-22 | The Regents Of The University Of Michigan | Self-reinforced cementitious composite compositions for building-scale three dimensional (3d) printing |
| 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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| US20200331165A1 (en) * | 2017-10-31 | 2020-10-22 | The Regents Of The University Of Michigan | Self-reinforced cementitious composite compositions for building-scale three dimensional (3d) printing |
| 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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