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

Abstract

The invention discloses a cement-based composite material used for 3D printing as well as a preparation method and application thereof, and belongs to the field of building materials. The cemented-based composite material comprises the following components in percentage by weight: 19-25% of a composite gel material, 0.2-0.6% of a shrinkage inhibitor, 1-2% of an anti-carbonization agent, 57-66% of aggregates, 0.3-1.1% of fiber-reinforced materials, 0.9-1.8% of a liquid alkali-free accelerating agent, 0.8-1.7% of a retarder, 0.02-2% of a thickening agent, 0.2-0.4% of a plastic retaining agent, 0.04-0.09% of a defoaming agent, 0.04-0.2% of a water reducer and 5-14% of water. A cement product printed by the cement-based composite material has no holes and pitted surface in appearance.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a cement-based composite material for 3D printing and its preparation method and application. Background technique [0002] The existing 3D printing technology is a technology based on digital model files, using powdered metal or plastic-based adhesive materials to construct objects by layer-by-layer printing. Traditional 3D printing technologies are all Used in the field of metal and polymer materials. Now, 3D printing technology has begun to try to be used in the construction of houses. Compared with traditional construction technology, 3D printing construction technology can produce complex and diverse buildings without using templates, which reduces construction costs; reduces labor input and reduces costs; reduces waste of materials and saves costs; processing speed is faster than traditional The industry is fast. [0003] Building materials generally use cemen...

AI Technical Summary

Problems solved by technology

[0003] Building materials generally use cement as the cementitious material. During the production process, cement usually undergoes a high temperature of more than 1400 degrees Celsius. When it is used, it needs to undergo a chemical reaction with water to solidify and form strength. The hydration process is particularly long and the setting speed is slow. , it is difficult to achieve the requirements of 3D printing fused deposition forming, which limits the 3D printing of cement-based materials like metal materials or polymer materials; secondly, cement-based materials are not easy to form after adding water and cement paste is a brittle material, The hardened slurry has poor resistance to external load impact and low toughness, which will cause the mechanical properties of 3D printed cement-based materials to fail to meet the needs of building materials

[0004] At present, there are relatively few studies and reports on 3D printing cement-based materials. The 3D printing cement-based materials disclosed in the four patent documents with application numbers of 201410554607.4, 201510225639.4, 201510375110.0 and 201510228281.0 all have the disadvantage of easy generation of air bubbles during the printing process, which seriously affects The appearance of cement products is improved; in addition, the above-mentioned patent documents all use alkaline accelerators, which are highly corrosive, and the strength of cement printed products is poor in the later stage.

These limit the application of 3D printing technology in the production of cement products

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