CN109531769A - A kind of anisotropic design of reduction 3D printing concrete and detection method - Google Patents

A kind of anisotropic design of reduction 3D printing concrete and detection method Download PDF

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Publication number
CN109531769A
CN109531769A CN201811335051.4A CN201811335051A CN109531769A CN 109531769 A CN109531769 A CN 109531769A CN 201811335051 A CN201811335051 A CN 201811335051A CN 109531769 A CN109531769 A CN 109531769A
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China
Prior art keywords
printing
concrete
detection
anisotropic
reduction
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CN201811335051.4A
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Chinese (zh)
Inventor
张云升
张宇
钱如胜
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东南大学
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Priority to CN201811335051.4A priority Critical patent/CN109531769A/en
Publication of CN109531769A publication Critical patent/CN109531769A/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG, OR MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00Producing shaped prefabricated articles from the material
    • B28B1/001Rapid manufacturing of 3D objects by additive depositing, agglomerating or laminating of material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B33ADDITIVE MANUFACTURING TECHNOLOGY
    • B33YADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00Processes of additive manufacturing

Abstract

The invention discloses a kind of anisotropic design of reduction 3D printing concrete and detection methods.The design method includes: (1) setting printing path CAD modeling;(2) printing path is set, the printing path uses non-parallel printing path, that is, the concrete upper and lower level for printing completion is non-parallel state, there are intersecting angle α, 0 ° < α≤90 °;(3) printed material is set;(4) specific print parameters are set;(5) dimensional parameters of print component are set.It is printed with above-mentioned Method of printing and completes concrete cuboid component, resistance to compression detection test specimen and anti-folding detection test specimen are made after hardening, then carry out resistance to compression and the detection of anti-folding respectively, stress load in detection process;A kind of loading direction for perpendicular to printing concrete layer, a kind of loading direction to be parallel to printing concrete even level or odd-level, compressive resistance loading velocity are 0.1 ~ 10KN/min, and fracture resistence force loading velocity is 0.1 ~ 1KN/min.This method can effectively reduce the anisotropy of printing concrete component.

Description

A kind of anisotropic design of reduction 3D printing concrete and detection method

Technical field:

The present invention relates to a kind of anisotropic design of reduction 3D printing concrete and detection methods, belong to concrete technology neck Domain.

Background technique:

Concrete is the most large construction material of today's society, most important in the development and construction of human society.And with The development of science and technology, 3D printing concrete technology are shown up prominently, and the technology abandoning tradition concrete branch mold process, is a kind of nothing Mold forming technology.

3D printing concrete be based on 3D printing technique and be applied to construction new technology, mainly using concrete as " ink " material and the print routine pre-set in accordance with three-dimensional softwares such as CAD, squeeze out concrete layer by nozzle, by continuous The accumulation of layer is built into 3D printing concrete component.

However, not only to have good printing performance, and print and complete after-hardening to 3D printing concrete component Performance is most important, especially the mechanical strengths such as its resistance to compression, anti-folding.And the mechanical strength of 3D printing concrete component by it is a variety of because The influence of element such as prints the material property of " ink ", the printing path of spray head, print speed, the size and shape of printing head, High slice width of printable layer etc.;And 3D printing concrete component lacks as ribs such as reinforcing bars, so that component strength is to a certain extent It reduces, and the different anisotropy to printing concrete component in 3D printing nozzle printing path have a significant impact.

Therefore most important for the anisotropy research of 3D printing concrete component mechanical strength.

Summary of the invention

The object of the present invention is to provide a kind of anisotropic design of reduction 3D printing concrete and detection methods, it is intended to logical It crosses and designs the modes of different printing paths to reduce the anisotropy of printing concrete component.

Above-mentioned purpose is achieved through the following technical solutions:

A kind of anisotropic design method of reduction 3D printing concrete, this method comprises:

(1) setting printing path CAD modeling;

(2) printing path is set, the printing path uses non-parallel printing path, that is, prints the concrete upper and lower level of completion For non-parallel state, there are intersecting angle α, 0 ° < α≤90 °;

(3) printed material is set;

(4) specific print parameters are set, including print speed, the size and shape of printing head, the high slice width of printable layer;

(5) dimensional parameters of print component are set;

The anisotropic design method of reduction 3D printing concrete, the printing path CAD modeling: being that will print spray The run trace of head is set as between upper and lower level that there are intersecting angle α, the run trace of 0 ° < α≤90 °, the i.e. second layer and first There are intersecting angle α for layer run trace, that is, between odd-level in parallel, parallel between even level, and odd-level and even level Between there are intersecting angle α, such alternately reciprocal printing concrete layer.

The anisotropic design method of reduction 3D printing concrete, the specific print parameters of the setting, packet Include print speed, the size and shape of printing head, the high slice width of printable layer;Wherein print speed is controlled in 8-10 m/min, and Corresponding screw feed rotation speed is 10-30 r/min, and spray head extruded velocity is 1-10L/min, and the size of printing head is 5-30mm, shape are round extruder head, and the corresponding high slice width of printable layer is respectively a height of 4-30mm of one-course concrete printable layer, is beaten The slice width of print is 5-30mm, and the total a height of 80-200mm of layer of printing concrete component, total slice width is 100-600mm.

The anisotropic design method of reduction 3D printing concrete, the size ginseng of the setting print component Number: the concrete component size of printing should meet (300-600) × (300-600) × (100-200) mm3Cuboid component.

The anisotropic design method of reduction 3D printing concrete, the printed material are mixed by following material Stirring is made: taking 20-65 parts of cement according to parts by weight, 0.4-8 parts of Mineral admixture, partial size is no more than the Machine-made Sand 23- of 5mm 40 parts, partial size is no more than 25-50 parts of coarse aggregate of 10mm, and 0.1-0.8 parts of additive, 0.2-1 parts of polymer fiber, water 10-24 Part.

The anisotropic design method of reduction 3D printing concrete, the Mineral admixture include silicon ash, stick The combination of one or more of soil, flyash, slag, the additive include water-reducing agent, thickener, thixotropic agent, The combination of one or more of retarder, early strength agent.

A kind of anisotropic test specimen detection method of reduction 3D printing concrete, this method are as follows:

It is printed with above-mentioned Method of printing and completes concrete cuboid component, resistance to compression detection test specimen and the detection examination of anti-folding are made after hardening Then part carries out resistance to compression and the detection of anti-folding respectively, stress load is set as at least two Impact directions, Yi Zhongwei in detection process Perpendicular to the loading direction of printing concrete, a kind of loading direction to be parallel to even level or odd-level, compressive resistance load speed Degree is 0.1 ~ 10KN/min, and fracture resistence force loading velocity is 0.1 ~ 1KN/min.

The anisotropic test specimen detection method of reduction 3D printing concrete, the resistance to compression detection test specimen and the inspection of anti-folding The dimensional parameters of test block are respectively as follows: (40 ~ 160) × (40 ~ 160) × (40 ~ 160) mm3Resistance to compression test specimen and (40 ~ 160) × (40 ~ 160) × (100 ~ 550) mm3Anti- folding test specimen.

The utility model has the advantages that

Compared with prior art, a kind of anisotropic design of reduction 3D printing concrete and detection method of the invention, have Following advantage: 1) devising the printing technique of non-parallel printing path, so that there are the angles of the crossing between printing concrete upper and lower level It spends α (0 ° < α≤90 °);2) non-parallel printing path resulting product is designed in the present invention, has been reduced at least one stress feelings Condition, so that at least one for reducing 3D printing concrete is weak to stress.

Detailed description of the invention

Fig. 1 is the method concrete component printed of parallel printing path and the load schematic diagram of detection process power.

Fig. 2 is the method concrete component printed of non-parallel printing path and the load schematic diagram of detection process power.

Specific embodiment

With reference to embodiment, the present invention is furture elucidated, it should be understood that following specific embodiments are only used for It is bright the present invention rather than limit the scope of the invention.

A kind of anisotropic design method of reduction 3D printing concrete of the present embodiment, this method comprises:

(1) setting printing path CAD modeling;

(2) printing path is set, the printing path uses non-parallel printing path, that is, prints the concrete upper and lower level of completion For non-parallel state, there are intersecting angle α, 0 ° < α≤90 °;

(3) printed material is set;

(4) specific print parameters are set, including print speed, the size and shape of printing head, the high slice width of printable layer;

(5) dimensional parameters of print component are set;

The anisotropic design method of reduction 3D printing concrete, the printing path CAD modeling: being that will print spray The run trace of head is set as between upper and lower level that there are intersecting angle α, the run trace of 0 ° < α≤90 °, the i.e. second layer and first There are intersecting angle α for layer run trace, that is, between odd-level in parallel, parallel between even level, and odd-level and even level Between there are intersecting angle α, such alternately reciprocal printing concrete layer.

The anisotropic design method of reduction 3D printing concrete, the specific print parameters of the setting, packet Include print speed, the size and shape of printing head, the high slice width of printable layer;Wherein print speed is controlled in 8-10 m/min, and Corresponding screw feed rotation speed is 10-30 r/min, and spray head extruded velocity is 1-10L/min, and the size of printing head is 5-30mm, shape are round extruder head, and the corresponding high slice width of printable layer is respectively a height of 4-30mm of one-course concrete printable layer, is beaten The slice width of print is 5-30mm, and the total a height of 80-200mm of layer of printing concrete component, total slice width is 100-600mm.

The anisotropic design method of reduction 3D printing concrete, the size ginseng of the setting print component Number: the concrete component size of printing should meet (300-600) × (300-600) × (100-200) mm3Cuboid component.

The anisotropic design method of reduction 3D printing concrete, the printed material are mixed by following material Stirring is made: taking 20-65 parts of cement according to parts by weight, 0.4-8 parts of Mineral admixture, partial size is no more than the Machine-made Sand 23- of 5mm 40 parts, partial size is no more than 25-50 parts of coarse aggregate of 10mm, and 0.1-0.8 parts of additive, 0.2-1 parts of polymer fiber, water 10-24 Part.

The anisotropic design method of reduction 3D printing concrete, the Mineral admixture include silicon ash, stick The combination of one or more of soil, flyash, slag, the additive include water-reducing agent, thickener, thixotropic agent, The combination of one or more of retarder, early strength agent.

A kind of anisotropic test specimen detection method of reduction 3D printing concrete, this method are as follows:

It is printed with above-mentioned Method of printing and completes concrete cuboid component, resistance to compression detection test specimen and the detection examination of anti-folding are made after hardening Then part carries out resistance to compression and the detection of anti-folding respectively, stress load is set as at least two Impact directions, Yi Zhongwei in detection process Perpendicular to the loading direction of printing concrete, a kind of loading direction to be parallel to even level or odd-level, compressive resistance load speed Degree is 0.1 ~ 10KN/min, and fracture resistence force loading velocity is 0.1 ~ 1KN/min.

The anisotropic test specimen detection method of reduction 3D printing concrete, the resistance to compression detection test specimen and the inspection of anti-folding The dimensional parameters of test block are respectively as follows: (40 ~ 160) × (40 ~ 160) × (40 ~ 160) mm3Resistance to compression test specimen and (40 ~ 160) × (40 ~ 160) × (100 ~ 550) mm3Anti- folding test specimen.

Embodiment:

A kind of anisotropic design of reduction 3D printing concrete and detection method, set according to the printing path difference of printing head Parallel printing path and non-parallel printing path are counted to prepare 3D printing concrete cuboid cube component, respectively for preparation detection Anisotropy test specimen.

(300 ~ 600) × (300 ~ 600) × (100 ~ 200) mm is prepared using parallel printing path3Cuboid component, hardening After be cut into (40 ~ 160) × (40 ~ 160) × (40 ~ 160) mm3Resistance to compression test specimen and (40 ~ 160) × (40 ~ 160) × (100 ~ 550) mm3Anti- folding test specimen, test result find there are 3 kinds of stress loading directions under the parallel printing path, such as attached drawing 1, T1, T2, T3。

(300 ~ 600) × (300 ~ 600) × (100 ~ 200) mm is prepared using non-parallel printing path3Cuboid component, (40 ~ 160) × (40 ~ 160) × (40 ~ 160) mm3Resistance to compression test specimen and (40 ~ 160) × (40 ~ 160) × (100 ~ 550) mm3Anti- folding Test specimen, test result finds there are 2 kinds of stress loading directions under the parallel printing path, such as attached drawing 2, T4, T5.

Comparative test result: each test specimen resistance to compression and flexural strength are tested after 28d standard curing, comparison of test results is such as Table,

Test result in contrast table is it is found that resistance to compression and flexural strength are with Impact direction under the lower three groups of stress of parallel printing path Difference, strength reduction is significant, and the two groups of resistance to compressions and flexural strength reduction under non-parallel printing path are less, and considerably reduce A kind of stress condition.

Claims (8)

1. a kind of anisotropic design method of reduction 3D printing concrete, it is characterised in that: this method comprises:
(1) setting printing path CAD modeling;
(2) printing path is set, the printing path uses non-parallel printing path, that is, prints the concrete upper and lower level of completion For non-parallel state, there are intersecting angle α, 0 ° < α≤90 °;
(3) printed material is set;
(4) specific print parameters are set, including print speed, the size and shape of printing head, the high slice width of printable layer;
(5) dimensional parameters of print component are set.
2. the anisotropic design method of reduction 3D printing concrete according to claim 1, it is characterised in that: described Printing path CAD modeling: being that the run trace of printing head is set as between upper and lower level there are intersecting angle α, 0 ° < α≤ There are intersecting angle α with first layer run trace for 90 ° of run trace, the i.e. second layer, that is, parallel, even number between odd-level It is parallel between layer, and there are intersecting angle α, the so reciprocal printing concrete layer of alternating between odd-level and even level.
3. the anisotropic design method of reduction 3D printing concrete according to claim 1, it is characterised in that: described Specific print parameters are set, including print speed, the size and shape of printing head, the high slice width of printable layer;Wherein printing speed Degree control is in 8-10 m/min, and corresponding screw feed rotation speed is 10-30 r/min, and spray head extruded velocity is 1-10L/ Min, the size of printing head are 5-30mm, and shape is round extruder head, and the corresponding high slice width of printable layer is respectively single layer coagulation The native a height of 4-30mm of printable layer, the slice width of printing are 5-30mm, the total a height of 80-200mm of layer of printing concrete component, total layer Width is 100-600mm.
4. the anisotropic design method of reduction 3D printing concrete according to claim 1, it is characterised in that: described Set the dimensional parameters of print component: the concrete component size of printing should meet (300-600) × (300-600) × (100- 200) mm3Cuboid component.
5. the anisotropic design method of reduction 3D printing concrete according to claim 1, it is characterised in that: described Printed material is made of the mixing of following material: take 20-65 parts of cement according to parts by weight, 0.4-8 parts of Mineral admixture, and grain Diameter is no more than 23-40 parts of Machine-made Sand of 5mm, and partial size is no more than 25-50 parts of coarse aggregate of 10mm, 0.1-0.8 parts of additive, polymerize 0.2-1 parts of fibres, 10-24 parts of water.
6. the anisotropic design method of reduction 3D printing concrete according to claim 1, it is characterised in that: described Mineral admixture includes the combination of one or more of silicon ash, clay, flyash, slag, and the additive includes The combination of one or more of water-reducing agent, thickener, thixotropic agent, retarder, early strength agent.
7. a kind of anisotropic test specimen detection method of reduction 3D printing concrete, it is characterised in that: this method are as follows:
It is printed with above-mentioned Method of printing and completes concrete cuboid component, resistance to compression detection test specimen and the detection examination of anti-folding are made after hardening Then part carries out resistance to compression and the detection of anti-folding respectively, stress load is set as at least two Impact directions, Yi Zhongwei in detection process Perpendicular to the loading direction of printing concrete, a kind of loading direction to be parallel to even level or odd-level, compressive resistance load speed Degree is 0.1 ~ 10KN/min, and fracture resistence force loading velocity is 0.1 ~ 1KN/min.
8. the anisotropic test specimen detection method of reduction 3D printing concrete according to claim 7, it is characterised in that: institute The dimensional parameters for stating resistance to compression detection test specimen and anti-folding detection test specimen are respectively as follows: (40 ~ 160) × (40 ~ 160) × (40 ~ 160) mm3 Resistance to compression test specimen and (40 ~ 160) × (40 ~ 160) × (100 ~ 550) mm3Anti- folding test specimen.
CN201811335051.4A 2018-11-10 2018-11-10 A kind of anisotropic design of reduction 3D printing concrete and detection method CN109531769A (en)

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