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A kind of fiber concrete material and preparation method thereof for 3D printing

A technology of fiber concrete and 3D printing, applied in the direction of additive processing, etc., can solve the problems of limited structural types, rapid construction design and increased technical obstacles, etc., to achieve strong integrity, change the failure form of bending resistance, and excellent cohesion Effect

Active Publication Date: 2020-07-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the layer-by-layer nature of 3D printing and the automatic setting of printing construction, the addition of steel skeletons will increase technical obstacles to the entire rapid construction design. Only ordinary-strength concrete materials are used, and the structural types that can be realized are very limited.

Method used

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  • A kind of fiber concrete material and preparation method thereof for 3D printing
  • A kind of fiber concrete material and preparation method thereof for 3D printing
  • A kind of fiber concrete material and preparation method thereof for 3D printing

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preparation example Construction

[0081] The preparation method for the fiber concrete material that the present invention provides for 3D printing comprises the following steps:

[0082] (1) After weighing cement, mineral powder, silica fume, quartz sand and setting retarder in proportion, mix them to obtain solid powder for use;

[0083] (2) Weigh the water reducing agent, water and fiber in proportion before use;

[0084] (3) Add water reducer and 3 / 4 of water to the mixed solid powder, stir for 90-120s, then add the remaining 1 / 4 of water, stir for 60-90s to obtain the mixture;

[0085] (4) Add fibers into the mixture obtained in step (3), and stir for 120-180s to obtain the fiber concrete material.

[0086] Refer to the standard "Measurement Method for Fluidity of Cement Mortar Sand" (GB_T2419-2005) to test the fluidity of fiber concrete materials, and "Standards for Test Methods of Basic Properties of Building Mortar" (JGJ / T70-2009) to test the initial setting time and final temperature of fiber concret...

Embodiment 1

[0090] In parts by weight, weigh 8.1 parts of sulfoaluminate cement, 6.5 parts of mineral powder, 1.6 parts of silica fume, 4.9 parts of quartz sand, 2.6 parts of water, 0.34 parts of polycarboxylate superplasticizer, and 0.0081 parts of tartaric acid retarder , 0.16 parts of fiber.

[0091] The specific construction method is to weigh cement, mineral powder, silica fume, quartz sand, and setting retarder in proportion, and then mix them to obtain solid powder for use. Weigh the water reducing agent, water and fiber in proportion before use. Add water reducer and 3 / 4 water to the mixed solid powder, stir for 90-120s, then add the remaining 1 / 4 water, stir for 60-90s. The fibers are added to the mixture obtained in the previous step and stirred for 120-180s to obtain the concrete.

[0092] The performance test results of the prepared fiber concrete material are: the fluidity is 158mm; the initial setting time is 27min, the final setting time is 47min; the 1-day compressive st...

Embodiment 2

[0095] In parts by weight, weigh 8.4 parts of sulfoaluminate cement, 6.7 parts of mineral powder, 1.7 parts of silica fume, 5.0 parts of quartz sand, 2.35 parts of mixing water, 0.39 parts of polycarboxylate superplasticizer, tartaric acid retarder 0.0084 parts, fiber 0.1 parts.

[0096] Concrete construction method is with embodiment 1.

[0097] The performance test results of the prepared fiber concrete material are: the fluidity is 158mm; the initial setting time is 28min, the final setting time is 45min; the 1-day compressive strength is 43.52MPa, the 3-day compressive strength is 60.57MPa, and the 7-day compressive strength is 73.85MPa. The 28-day compressive strength is 85.61MPa; the 1-day flexural strength is 8.02MPa, the 3-day flexural strength is 10.76MPa, the 7-day flexural strength is 12.97MPa, and the 28-day flexural strength is 12.90MPa.

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Abstract

The invention discloses a fiber concrete material for 3D (three-dimensional) printing and a preparation method of the fiber concrete material. The fiber concrete material comprises, by weight, 7.8-8.4parts of cement, 4.0-6.7 parts of mineral powder, 1.3-1.7 parts of silicon ash, 4.7-7.7 parts of quartz sand, 2.3-2.9 parts of water, 0.2-0.39 part of water reducing agent, 0.0065-0.0168 part of retarders, 0-0.004 part of thixotropic agents and 0.1-0.2 part of fibers. The fiber concrete material has suitable initial setting time and final setting time, high compressive strength, bending strengthand toughness, good workability and thixotropy, layers can be effectively cohered, deformation and collapse are avoided in the stacking process, condensation and thixotropic properties of the fiber concrete material can be accurately designed according to engineering requirements, and different printing speed and structure construction requirements can be met.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a fiber concrete material for 3D printing and a preparation method thereof. Background technique [0002] Over the past two decades, the traditional method of pouring concrete in situ has gradually been replaced by prefabricated concrete. People are constantly looking for more automated and convenient construction methods to reduce labor and construction time, improve construction quality and reduce the impact of construction on the environment. [0003] As an additive manufacturing technology, 3D printing has been developing continuously since its birth and has been applied in many fields. Because this technology has the advantages of no mold, rapid and fine molding, more and more attempts have been made in the civil engineering industry in recent years, and it has been proved to be a new construction technology that can complete engineering construction faster and better. Ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B28/06B33Y70/10
CPCB33Y70/00C04B28/04C04B28/06C04B2111/00181C04B2201/50C04B18/12C04B18/146C04B14/06C04B2103/302C04B24/06C04B2103/0085C04B16/0641
Inventor 王海龙孙晓燕汪群高超张治成
Owner ZHEJIANG UNIV
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