Cement-based composite material used for 3D printing technology as well as preparation method and application thereof

A 3D printing and composite material technology, which is applied in the field of cement-based composite materials and its preparation, can solve the problems of environmental and human hazards, poor building livability, and high requirements for printing conditions

Active Publication Date: 2015-01-28
CHINA STATE CONSTRUCTION ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a cement-based composite material for 3D printing technology and its preparation method and application, to solve the problem that most of the materials used in 3D printing technology in the prior art are organic materials, which are printed in a molten state at high temperature , Chemical reactions such as oxidation and decomposition are prone to occur, and unpleasant toxic gases are released during the preparation and construction process, which is harmful

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] 30% sulfoaluminate cement, 3% ordinary portland cement, 8% mineral powder, 38% tailings machine-made sand, 2.7% polymer, 0.2% naphthalene-based high-efficiency water reducer, 0.05% lithium carbonate, Sodium tetraborate 0.1%, sodium gluconate 0.1%, tartaric acid 0.05%, thixotropic agent 0.5%, starch ether 0.2%, polypropylene fiber 0.1%, shrinkage reducing agent 1%, mixing water 16.2%.

[0061] The preparation method of the above-mentioned 3D printing materials is as follows: pre-mix the above powdery raw materials, add water and fully stir them, and then pump them and extrude them for construction by a construction 3D printer. The amount of stirring each time can be controlled according to the printing speed. The specific steps are as follows: Step 1. Preparation of retarder: Weigh or measure sodium tetraborate, sodium gluconate and tartaric acid in proportion, mix them evenly, and prepare retarder for use;

[0062] Step 2, preparing a composite coagulation regulator: ad...

Embodiment 2

[0070] 40% sulfoaluminate cement, 5% fly ash, 32% tailings machine-made sand, 3% polymer, 0.25% naphthalene superplasticizer, 0.1% lithium carbonate, 0.1% sodium tetraborate, glucose Sodium saccharate 0.1%, tartaric acid 0.05%, thixotropic agent 1%, starch ether 0.1%, polypropylene fiber 0.1%, shrinkage reducing agent 1.2%, mixing water 17%.

[0071] The specific implementation steps are the same as those in Embodiment 1, and the amount of stirring each time can be controlled according to the printing speed.

[0072] The performance of the cement-based composite material printed by 3D in this embodiment is tested, and the test results are as follows:

[0073] The initial setting time is 25min, the end time is 37min,

[0074] Compressive strength R 2h =18.3MPa, R3d=43.1MPa, R 28d =57.2MPa

[0075] Free expansion rate: 0.010%.

Embodiment 3

[0077] Sulphoaluminate cement 30%, ordinary Portland cement 5%, S95 grade mineral powder 8%, tailings machine-made sand 35%, high molecular polymer 2.5%, naphthalene-based superplasticizer 0.2%, lithium carbonate 0.05% , sodium tetraborate 0.1%, sodium gluconate 0.1%, thixotropic agent 0.5%, polypropylene fiber 0.1%, starch ether 0.25%, shrinkage reducing agent 1%, mixing water 17.2%.

[0078] The specific implementation steps are the same as those in Embodiment 1, and the amount of stirring each time can be controlled according to the printing speed.

[0079] The performance of the cement-based composite material printed by 3D in this embodiment is tested, and the test results are as follows:

[0080] The initial setting time is 35 minutes, and the final time is 48 minutes;

[0081] Compressive strength R 2h =16.5MPa, R3d=43.2MPa, R 28d =53.6MPa;

[0082] Free expansion rate: 0.013%.

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Abstract

The invention provides a cement-based composite material used for a 3D printing technology as well as a preparation method and application thereof. The cement-based composite material is prepared from the following raw materials based on the total weight of the composite material: 33%-40% of cement, 0%-8% of inorganic powder, 32%-38% of tailing machine-made sand, 2.5%-3% of a high-molecular polymer, 0.1%-0.5% of a water reducing agent and 16.7%-20% of mixing water; a composite thickening time control agent, a thixotropic agent, a volume stabilizer and the like are added into a mixture to prepare an inorganic composite material; and then the inorganic composite material can be directly pumped into a 3D printer for building to be applied to construction. The cement-based composite material is an inorganic material and the materials are easily available; a lot of industrial waste materials can be used; therefore, the cement-based composite material is low in cost, energy-saving and environment-friendly; the condensation time can be flexibly controlled, and the material has super early strength, good caking property and strong stability; the requirements of 3D printing construction continuity of the building and the building strength are met so that the house building has good global stability and use safety; and the application and popularization of 3D printing technology can be greatly promoted.

Description

technical field [0001] The invention relates to the technical field of 3D printing materials, in particular to a cement-based composite material used in 3D printing technology and its preparation method and application. Background technique [0002] 3D printing (3D printing) is a kind of rapid prototyping technology. Based on digital model files, it uses powdered metal or plastic and other bondable materials to construct objects by layer-by-layer printing, and finally turns the blueprint on the computer into into a real thing. There are applications in jewelry, footwear, industrial design, architectural engineering and construction, automotive, aerospace, dental and medical industries, education, geographic information systems, civil engineering, firearms, and others. 3D printing architecture is a building constructed by 3D printing technology, consisting of a giant three-dimensional extrusion machine, using gear transmission on the extrusion head of the system to create th...

Claims

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Application Information

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IPC IPC(8): C04B28/06C04B28/04C04B18/12
CPCC04B28/06C04B2111/00181Y02W30/91C04B7/02C04B14/06C04B14/104C04B18/08C04B18/141C04B18/146C04B22/0013C04B22/10C04B24/04C04B24/383C04B2103/32
Inventor 蔺喜强李景芳张涛霍亮张楠廖娟李国友
Owner CHINA STATE CONSTRUCTION ENGINEERING CORPORATION
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