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Two-component cement-based composite material for 3D printing and its preparation method and use

A 3D printing and composite material technology, which is applied in the field of two-component cement-based composite materials for 3D printing and its supporting preparation, can solve the problems of high construction organization requirements, short setting time, equipment damage, etc., and achieve slump Good maintenance, reduced sliding resistance, good lubrication effect

Active Publication Date: 2017-12-05
CHINA STATE CONSTRUCTION ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, single-component cement-based 3D printing materials have a short setting time and rapid strength growth, which can meet the needs of small batches on site, but have high requirements for construction organization, and can only be prepared by mixing at the construction site. The material should be pumped and printed before the initial setting, otherwise it will condense in the mixing equipment and the conveying equipment of the 3D printer, causing damage to the equipment, and it will be used up in a short period of time, which requires a lot of personnel organization and construction management on the construction site. High, and the single-component fast-setting cement-based 3D printing materials cannot realize the ready-mixed production of concrete mixing plants, which limits the development of architectural 3D printing technology; in addition, due to the short setting time, it cannot be transported by concrete tank trucks after factory pre-mixing Construction site use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] 1. The weight percentage of each raw material of component A is as follows:

[0096] Sulphoaluminate cement 34%, S95 mineral powder 6%, tailings machine-made sand 44%, polymer 2.5%, polycarboxylate water reducer 0.15%, sodium tetraborate 0.2%, sodium gluconate 0.1% , 0.05% starch ether, 0.1% polypropylene fiber, 0.05% defoamer, 0.85% shrinkage reducing agent, and 12% mixing water.

[0097] Preparation of mixed component A: pre-mix the above powdered raw materials, add water and stir thoroughly.

[0098] Component A can be pre-mixed in the mixing station and loaded into the concrete mixer truck to be transported to the construction site for use, or it can be pumped into the construction 3D printer after being mixed on site. The amount of mixing can be controlled according to the printing speed. The specific steps are as follows:

[0099] Step 1. Prepare retarder: Weigh or measure sodium tetraborate, sodium gluconate and tartaric acid in proportion, mix them uniformly, a...

Embodiment 2

[0111] 1. The weight percentage of each raw material of component A is as follows:

[0112] Sulphoaluminate cement 36%, fly ash 4%, tailings machine-made sand 42%, polymer 3.0%, polycarboxylate superplasticizer 0.2%, sodium tetraborate 0.3%, sodium gluconate 0.1% , 0.2% starch ether, 0.1% polypropylene fiber, 1% shrinkage reducing agent, 0.1% defoamer, and 13% mixing water.

[0113] The specific preparation steps are the same as in Example 1.

[0114] 2. The weight percentage of each raw material of component B is as follows:

[0115] Lithium carbonate 2.5%, thixotropic agent 3.5%, defoamer 1%, mixing water 93%.

[0116] The specific preparation steps are the same as in Example 1.

[0117] 3. Preparation of two-component cement-based composite materials for 3D printing:

[0118] Pump the prepared A and B components into the two-component material building 3D printer according to the mass ratio of A:B=15:1, and then extrude A+B cement-based composite 3D printing after mixin...

Embodiment 3

[0121] 1. The weight percentage of each raw material of component A is as follows:

[0122] 40% sulfoaluminate cement, 40% tailings machine-made sand, 3.0% polymer, 0.5% sulfamate superplasticizer, 0.6% sodium tetraborate, 0.35% sodium gluconate, 0.05% tartaric acid, Starch ether 0.5%, polypropylene fiber 0.2%, shrinkage reducing agent 1.3%, defoamer 0.1%, mixing water 13.4%.

[0123] The specific preparation steps are the same as in Example 1.

[0124] 2. The weight percentage of each raw material of component B is as follows:

[0125] Lithium carbonate 3%, thixotropic agent 4%, defoamer 1.5%, mixing water 91.5%.

[0126] The specific preparation steps are the same as in Example 1.

[0127] 3. Preparation of two-component cement-based composite materials for 3D printing:

[0128] Pump the prepared A and B components into the two-component material building 3D printer according to the mass ratio of A:B=10:1, and then extrude A+B cement-based composite 3D printing after mix...

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Abstract

A two-component cement-based composite material for 3D printing and its preparation method and application, including two components A and B, A containing 34% to 40% sulfoaluminate cement, 0% to 6% inorganic powder, 40% to 44% tailings machine-made sand and 2.5% to 3% polymer, and the rest are retarder, water reducer, volume stabilizer, defoamer and water. Its pumping performance is good and the maintenance time is long. Realize the industrialization process of ready-mixed production-transportation-construction site use of mixing station; B includes coagulant, thixotropic agent, defoamer and water, and its stable form can be stored for a long time or concentrated production. A and B are pumped into the 3D printer and then mixed by the high-speed stirring extrusion head to extrude the composite printing material, which has short coagulation time, high strength, good cohesiveness, and strong stability, which meets the construction continuity and construction requirements of architectural 3D printing. Strength requirements, facilitate the industrial production and promotion of cement-based 3D printing materials, and effectively promote the application of 3D printing technology in construction.

Description

technical field [0001] The invention relates to the technical field of 3D printing, in particular to a two-component cement-based composite material for 3D printing and its supporting preparation method and application. Background technique [0002] 3D printing technology is an advanced manufacturing technology that realizes three-dimensional entities through continuous physical layer superposition and layer-by-layer addition of materials. It has the characteristics of digitalization, networking, personalization and customization. 3D printing technology is very similar to the ordinary printing process. The information of the product can be designed in advance on the computer and then printed by the machine. The difference is that the ordinary ink becomes plastic, fiber, powder and other materials, and these materials are sprayed through giant nozzles. Layers are superimposed to form a physical product. 3D printing technology has been used maturely in industries such as aero...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/06
CPCC04B2111/00181C04B28/065C04B14/06C04B40/065C04B2103/10C04B2103/30C04B2103/50
Inventor 蔺喜强李景芳张涛霍亮李国友张楠廖娟王宝华戢文占
Owner CHINA STATE CONSTRUCTION ENGINEERING CORPORATION
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