CN116771031A - Negative poisson ratio light partition wall and preparation method thereof - Google Patents
Negative poisson ratio light partition wall and preparation method thereof Download PDFInfo
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- CN116771031A CN116771031A CN202310732529.1A CN202310732529A CN116771031A CN 116771031 A CN116771031 A CN 116771031A CN 202310732529 A CN202310732529 A CN 202310732529A CN 116771031 A CN116771031 A CN 116771031A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 11
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- 239000004567 concrete Substances 0.000 claims abstract description 6
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 5
- 239000004677 Nylon Substances 0.000 claims abstract description 5
- 239000004917 carbon fiber Substances 0.000 claims abstract description 5
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Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application discloses a light partition wall with negative poisson ratio and a preparation method thereof, belonging to the technical field of building materials, and comprising the following steps: the inner support bracket with the negative poisson ratio comprises a plurality of unit cell units, wherein the light filler is filled in the inner part and the peripheral side of the inner support bracket with the negative poisson ratio; the unit cell unit includes: the upper component, the lower component and the central supporting rod are symmetrically arranged about the midpoint of the central supporting rod. The negative poisson ratio internal support bracket has the advantages that when the negative poisson ratio internal support bracket is pressed, the negative poisson ratio internal support bracket is contracted inwards, the light filler is damaged by the pressing and expands outwards, the negative poisson ratio internal support bracket provides a double-shaft compression state for the light filler, so that additional support is provided, the compressive strength is improved, and due to the characteristic that the negative poisson ratio internal support bracket is contracted inwards, the initial strength of cracks when concrete is pressed can be effectively increased, the generation of the cracks is reduced, and in the aspect of material selection, the negative poisson ratio internal support bracket is made of nylon carbon fiber, so that the light high-strength performance is met, and meanwhile, the high recovery performance is achieved.
Description
Technical Field
The application belongs to the technical field of building materials, and particularly relates to a negative poisson ratio light partition wall and a preparation method thereof.
Background
The negative poisson ratio material means that the material transversely contracts (expands) when being pressed (pulled), namely the material gathers inwards when being pressed, the instantaneous density is increased, and the outer part shows higher rigidity, so that the negative poisson ratio material has good stress diffusion effect, stronger impact resistance and toughness enhancement capability. This is contrary to the deformation characteristics of most materials in nature, but there are still many similar structures such as cat skin, cow nipple skin, cubic metallic elements, etc., which were originally proposed in the 3D polymer foam research of Lakes, followed by the appearance of a large number of artificial negative poisson's ratio structures from macroscopic to molecular fields such as concave regular hexagonal structures, star-shaped structures, chiral structures, etc.
However, the negative poisson ratio concave structure reduces the rigidity of the structure while endowing the structure with good retraction performance, and each composition phase can contribute to the overall performance of the composite material in a very independent mode by reasonably designing the composite material. For example, using a negative poisson's ratio auxetic structure as the endoskeleton and a geopolymer material with a higher modulus of elasticity as the composite material of the matrix, the negative poisson's ratio structure contracts inward when compressed and the geopolymer matrix expands outward when compressed, the negative poisson's ratio structure places the matrix in a biaxially compressed state, thus providing additional support.
The negative poisson ratio honeycomb structure is more complex in structure, so that the manufacturing process is difficult, the common 3D printing is often formed into a dense support and is difficult to disassemble, but in recent years, the continuous development of additive manufacturing technology provides more possibilities and freedom for the printing of a space structure, the complex structural design can be carried out through software on the structural level, the slicing optimization can be carried out on the structure on the model processing, more and more high-performance composite materials are added into the printing materials on the material selection, and the 3D printing composite structure is also increasingly noticed by researchers.
While meeting the high-speed development of economy, people attach more and more importance to the development of economy and greenness, sustainability and low carbonization, the traditional heat-preservation panel is mainly made of cement, a large amount of dust and greenhouse gases are generated in the manufacturing process, the development of green economy is not facilitated, the existing cement partition wall material is mainly made of a foaming structure to reduce the overall density, but the air hole structure reduces the weight and simultaneously causes the loss of the overall strength, and the sound insulation is only produced by irregular holes generated by the foaming agent, so that the effect is general.
With the increase of energy demand, the discharge amount of some industrial wastes is increased sharply, the discharge amount of the ninety-year fly ash is 1.25 hundred million tons, about 3 hundred million tons are produced annually in the twentieth century, and the discharge amount of the waste is about 6 hundred million tons in recent years, the reuse of the wastes is an urgent problem, while the geopolymer is active waste materials generated by the energy industry, such as fly ash and slag, and the Si-O bonds and the Al-O bonds in the waste materials are broken and recombined through the activation of an alkali excitant to form a cementing phase M { - (SiO 2) -zAlO2} n.wH2O, and then the cementing phase M { SiO 2) -zAlO 2O is solidified and hardened to form strength, so that the geopolymer has a prospect of replacing cement in the future.
Disclosure of Invention
The application aims to provide a light partition wall with negative poisson ratio and a preparation method thereof, which are used for solving the defects in the prior art.
In order to achieve the aim of the application, the application adopts the following technical scheme:
a negative poisson's ratio lightweight partition wall comprising: the inner support bracket with the negative poisson ratio comprises a light filler filled in the inner part and the peripheral side of the inner support bracket with the negative poisson ratio, and the inner support bracket with the negative poisson ratio comprises a plurality of unit cell units;
the unit cell unit includes: the upper component and the lower component are symmetrically arranged about the midpoint of the central supporting rod.
Preferably, the upper assembly and the lower assembly are identical in structure, and the upper assembly comprises: four indent poles, the inboard midpoint of four indent poles end to end and every indent pole all is connected with the straight-bar, and the other end of four straight-bars all is connected with the top of central bracing piece, and the hookup point of four indent poles all is provided with the diagonal bracing, and the other end of four diagonal bracing all is connected with the midpoint of central bracing piece, and the bottom midpoint of four indent poles still is connected with the stiffening rod, the stiffening rod fixed connection that the stiffening rod of upper assembly corresponds with lower subassembly.
Preferably, a plurality of grooves are formed in the outer side face of the concave rod, and magnet stones are adhered in the grooves.
Preferably, adjacent unit cells share a concave bar in the horizontal direction, and are stacked layer by layer through a common plane in the vertical direction.
Preferably, the included angle between the concave rod and the horizontal line is theta 1 The included angle between the reinforcing rod of the upper assembly and the reinforcing rod corresponding to the lower assembly is theta 2 Wherein θ is 1 ≤90°，θ 2 ≤180°。
Preferably, the light filler is composed of the following materials in parts by mass:
preferably, the content of hydrogen peroxide is 7.5% or more.
Preferably, the fineness of the fly ash is 9.6%, and the quality grade is first grade.
Preferably, the self-made alkali-activated agent is prepared from natrolite powderPowder, na 2 CO 3 Mixing the solution with NaOH solution to obtain albite powder, na 2 CO 3 The mass ratio of the solution to the NaOH solution is 1:4:3, the Na is 2 CO 3 The mass fraction of solute in the solution and NaOH solution was 10%.
A preparation method of a light partition wall with negative poisson ratio comprises the following steps:
s1: negative poisson's ratio internal support bracket printing
Modeling by SOLIWORKS software, wherein the export format is STL, the printing material is nylon carbon fiber powder, 3D printing is carried out by adopting a laser sintering technology, and after the printing, the magnet is adhered in the groove;
s2: preparation of light-weight filler
According to the proportion requirement, albite powder and Na 2 CO 3 Mixing the solution with NaOH solution, fully reacting to obtain self-made alkali excitant, mixing and stirring fly ash and kaolin to obtain a mixture, adding water and the self-made alkali excitant, stirring to form geopolymer slurry, adding prepared hydrogen peroxide and calcium stearate, further stirring, adding hollow glass beads and chopped glass fibers in the stirring process to obtain geopolymer slurry, and finally adding latex and iron powder, mixing and stirring to obtain light filler;
s3: grouting maintenance
Fixing the negative poisson ratio internal support bracket in a film, setting a protective layer with the thickness d=2cm, injecting light filler after the complete fixation, then placing the film on a concrete vibrating table for vibrating compaction, curing for 36 hours in a curing box at 60 ℃, spraying calcium hydroxide solution for curing every 12 hours, removing the film after the complete curing, and curing for 14 days at normal temperature to obtain the negative poisson ratio light partition wall.
Compared with the prior art, the negative poisson ratio light partition wall and the preparation method thereof provided by the application have the following advantages:
according to the application, the negative poisson ratio internal support is manufactured by a 3D printing technology based on a bionics principle, the light filler with larger elastic modulus is used as a matrix, when the negative poisson ratio internal support is pressed, the light filler is compressed and damaged to expand outwards, the negative poisson ratio internal support provides a double-shaft compression state for the light filler, so that extra support is provided, the compressive strength is improved, and the initial strength of cracks when concrete is pressed can be effectively increased due to the inward shrinkage characteristic of the negative poisson ratio internal support, the generation of the cracks is reduced, and the negative poisson ratio internal support selects nylon carbon fiber in material selection, so that the light high-strength performance is met, and meanwhile, the high-recovery performance is achieved;
compared with the existing single foaming cement light partition wall, the light filler in the application adopts the cementing material which is waste fly ash in the energy industry, thereby realizing solid waste utilization, conforming to the concept of green development, and in the aspect of reducing weight, hollow glass beads (ELF light embedded parts) are selected to be mixed with chemical foaming, so that the density of the light partition wall is further reduced, and meanwhile, the sound insulation effect is enhanced;
in order to enhance the coupling degree of the light filler and the negative poisson ratio internal support, grooves are formed in the concave rods of the negative poisson ratio internal support, after printing is finished, the grooves are bonded with the magnet, the magnet interacts with the light filler, and the added chopped glass fibers and latex further enhance the integrity of the negative poisson ratio light partition wall material and improve the compressive strength and the shearing strength.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the structure of the present application;
FIG. 2 is a top view of the present application;
FIG. 3 is a schematic diagram of the structure of the unit cell of the present application;
FIG. 4 is an enlarged view of a portion of FIG. 3 at A;
FIG. 5 is a flow chart of the preparation of the present application.
In the figure: 1-negative poisson ratio internal support, 2-light filler, 3-unit cell unit, 4-central support rod, 5-concave rod, 6-straight rod, 7-diagonal support, 8-reinforcing rod, 9-magnet and 10-common plane.
Detailed Description
The technical scheme of the application is further described below with reference to the accompanying drawings and examples:
example 1
Referring to fig. 1-4, the present application provides a negative poisson's ratio light partition wall comprising: the negative poisson ratio inner support bracket 1 is characterized in that the inside and the peripheral side of the negative poisson ratio inner support bracket 1 are filled with light filler 2, and the negative poisson ratio inner support bracket 1 consists of a plurality of unit cell units 3;
the unit cell unit 3 includes: the upper component, the lower component and the central supporting rod 4 are symmetrically arranged about the midpoint of the central supporting rod 4. The structure of the upper assembly is identical with that of the lower assembly, and the upper assembly comprises: the four indent poles 5, the head and the tail of four indent poles 5 meet and the inboard midpoint of every indent pole 5 all is connected with straight-bar 6, and the other end of four straight-bars 6 all is connected with the top of center bracing piece 4, and the tie point of four indent poles 5 all is provided with diagonal bracing 7, and the other end of four diagonal bracing 7 all is connected with the midpoint of center bracing piece 4, and the bottom midpoint of four indent poles 5 still is connected with stiffener 8, stiffener 8 and the stiffener 8 fixed connection that the lower subassembly corresponds of upper assembly. Further, the vertical projection length of the concave rod 5 is L 1 The length of the central support rod 4 is L 2 The thicknesses of the central supporting rod 4, the concave rod 5, the straight rod 6, the inclined supporting rod 7 and the reinforcing rod 8 are all L 3 。
A plurality of grooves are formed in the outer side face of the concave rod 5, and a magnet 9 is bonded in each groove. In the horizontal direction, adjacent unit cells 3 share a concave bar 5, and in the vertical direction, adjacent unit cells 3 are stacked layer by layer through a common plane 10. The included angle between the concave rod 5 and the horizontal line is theta 1 The reinforcing rod 8 of the upper component is clamped with the corresponding reinforcing rod 8 of the lower componentThe angle is theta 2 Wherein θ is 1 ≤90°，θ 2 Less than or equal to 180 degrees. Further explaining that the poisson ratio of the negative poisson ratio inner support bracket 1 is a negative value, deriving the equivalent poisson ratio according to a material mechanics formula, and obtaining the equivalent poisson ratio as follows:
wherein ε is x For transverse strain, ε y Is the longitudinal strain, L is the length of the diagonal support 7, F is the stress of the diagonal support, L 3 For the thickness of the concave bar 5, θ 2 For the included angle between the upper component reinforcing rod 8 and the lower component reinforcing rod 8, the value of L is far greater than L 3 Can obtain that the numerator is positive and the denominator is positive, and can obtain v eq And < 0, the component is a negative poisson's ratio material.
The light filler 2 is composed of the following materials in parts by mass:
as a preferred embodiment, the hydrogen peroxide content is 7.5% or more. The fineness of the fly ash is 9.6%, and the quality grade is first grade. The self-made alkali-activated agent is prepared from albite powder and Na 2 CO 3 Mixing the solution with NaOH solution to obtain albite powder, na 2 CO 3 The mass ratio of the solution to the NaOH solution is 1:4:3, the Na is 2 CO 3 The mass fraction of solute in the solution and NaOH solution was 10%. Compared with the conventional alkali excitant, the self-made alkali excitant provided by the application adopts albite powder and Na 2 CO 3 The solution and NaOH solution are prepared by reaction, and the reaction equation is that
2-Al 2 O 3 +2NaOH＝2NaAlO 2 +H 2 O
3-2NaOH+CO2＝Na 2 CO 3 +H 2 O
Na formed in the third reaction 2 CO 3 The method has the advantages that the method plays a role in promoting the first reaction, improves the reaction proceeding rate, and prepares the alkali-exciting agent through mineral powder, so that the using amount of the conventional alkali-exciting agent is obviously reduced, and the strength of the geopolymer cementing material is improved.
Referring to fig. 5, the application provides a method for preparing a light partition wall with negative poisson ratio, which comprises the following steps:
s1: printing of negative poisson ratio inner support bracket 1
Modeling by SOLIWORKS software, and taking the values of all parameters as L 1 ＝10cm，L 2 ＝5cm，L 3 ＝8mm，θ 1 ＝30°，θ 2 STL, the printing material is nylon carbon fiber powder, 3D printing is carried out by adopting a laser sintering technology, and the magnet 9 is adhered in the groove after the printing;
s2: preparation of light Filler 2
According to the proportion requirement, albite powder and Na 2 CO 3 Mixing the solution with NaOH solution, fully reacting to obtain self-made alkali excitant, mixing and stirring fly ash and kaolin for 30s to obtain a mixture, adding water and the self-made alkali excitant, stirring to form geopolymer slurry, adding prepared hydrogen peroxide and calcium stearate, further stirring, adding hollow glass beads and chopped glass fibers in the stirring process to obtain geopolymer slurry, and finally adding latex and iron powder, mixing and stirring to obtain light filler 2;
s3: grouting maintenance
Fixing the negative poisson ratio internal support bracket 1 in a film, setting a protective layer with the thickness d=2cm, injecting light filler 2 after the complete fixation, then placing the film on a concrete vibrating table for vibrating compaction, curing for 36 hours in a curing box at 60 ℃, spraying calcium hydroxide solution every 12 hours for curing, removing the film after the complete curing, and curing for 14 days at normal temperature.
Example 2
Example 2 differs from example 1 in that the light filler 2 consists of the following materials in parts by mass:
example 3
Example 3 differs from example 1 in that the light filler 2 consists of the following materials in parts by mass:
comparative example 1
Comparative example 1 is a reinforced concrete wall made of C20 concrete.
Comparative example 2
Comparative example 2 is a conventional red brick block wall.
The experimental data for examples 1-3 and comparative examples 1-2 are summarized in the following table:
TABLE 1
As shown by the data in the table, the negative Poisson's ratio light partition wall has mechanical properties which are not input into the traditional reinforced concrete wall and the building block wall in the compressive strength, is obviously reduced in the dry density compared with the traditional reinforced concrete wall and the red brick wall, and the number of cracks with 0.1mm-3mm in the compressive test is obviously lower than that of the traditional concrete brick wall, so that the negative Poisson's ratio light wall has a higher application prospect.
In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present application and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
It should be noted that in the present application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A lightweight partition wall of negative poisson's ratio, comprising: the negative poisson ratio inner support (1) is filled with light filler (2) at the inner side and the peripheral side of the negative poisson ratio inner support (1), and the negative poisson ratio inner support (1) is composed of a plurality of unit cell units (3);
the unit cell unit (3) includes: the upper component, the lower component and the central supporting rod (4) are symmetrically arranged about the midpoint of the central supporting rod (4).
2. The lightweight partition wall of negative poisson's ratio according to claim 1, wherein the upper assembly has exactly the same structure as the lower assembly, and the upper assembly includes: four indent poles (5), the head and the tail phase-connection of four indent poles (5) and the inboard midpoint of every indent pole (5) all are connected with straight-bar (6), the other end of four straight-bars (6) all is connected with the top of center bracing piece (4), the tie point of four indent poles (5) all is provided with diagonal bracing (7), the other end of four diagonal bracing (7) all is connected with the midpoint of center bracing piece (4), the bottom midpoint of four indent poles (5) still is connected with stiffener (8), stiffener (8) of last subassembly and stiffener (8) fixed connection that the subassembly corresponds down.
3. The lightweight partition wall with negative poisson ratio according to claim 2, wherein a plurality of grooves are formed in the outer side face of the concave rod (5), and magnet (9) is adhered in the grooves.
4. A lightweight partition wall with negative poisson's ratio according to claim 2, characterized in that adjacent unit cells (3) share a concave bar (5) in the horizontal direction, and adjacent unit cells (3) are stacked layer by layer in the vertical direction by means of a common plane (10).
5. The lightweight partition wall according to claim 2, wherein said inner wall is of a negative poisson's ratioThe included angle between the concave rod (5) and the horizontal line is theta 1 The included angle between the reinforcing rod (8) of the upper component and the reinforcing rod (8) corresponding to the lower component is theta 2 Wherein θ is 1 ≤90°，θ 2 ≤180°。
6. The negative poisson's ratio light partition wall according to claim 1, wherein the light filler (2) consists of the following materials in parts by mass:
7. the lightweight partition wall according to claim 6, wherein the hydrogen peroxide is contained in an amount of 7.5% or more.
8. The lightweight partition wall according to claim 6, wherein the fly ash has a fineness of 9.6% and a quality grade of first grade.
9. The lightweight partition wall according to claim 6, wherein the self-made alkali-exciting agent is made of albite powder, na 2 CO 3 Mixing the solution with NaOH solution to obtain albite powder, na 2 CO 3 The mass ratio of the solution to the NaOH solution is 1:4:3, the Na is 2 CO 3 The mass fraction of solute in the solution and NaOH solution was 10%.
10. The method for preparing a lightweight partition wall with negative poisson's ratio according to any one of claims 1 to 9, comprising the steps of:
s1: printing by negative poisson ratio inner support bracket (1)
Modeling by SOLIWORKS software, wherein the export format is STL, the printing material is nylon carbon fiber powder, 3D printing is carried out by adopting a laser sintering technology, and after the printing, the magnet (9) is adhered in the groove;
s2: preparation of light Filler (2)
According to the proportion requirement, albite powder and Na 2 CO 3 Mixing the solution with NaOH solution, fully reacting to obtain self-made alkali excitant, mixing and stirring fly ash and kaolin to obtain a mixture, adding water and the self-made alkali excitant, stirring to form geopolymer slurry, adding prepared hydrogen peroxide and calcium stearate, further stirring, adding hollow glass beads and chopped glass fibers in the stirring process to obtain geopolymer slurry, and finally adding latex and iron powder, mixing and stirring to obtain light filler (2);
s3: grouting maintenance
Fixing the negative poisson ratio internal support bracket (1) in a film, setting a protective layer with the thickness d=2cm, injecting light filler (2) after the complete fixation, then placing the film on a concrete vibrating table for vibrating compaction, curing for 36 hours in a curing box at 60 ℃, spraying calcium hydroxide solution for curing every 12 hours, removing the film after the complete curing, and curing for 14 days at normal temperature to obtain the negative poisson ratio light partition wall.
Priority Applications (1)
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