A material suitable for 3D printing concrete shear walls and its preparation method

Abstract

The present invention uses Portland cement, sulphoaluminate cement, silica fume, quicklime, 20-40 mesh quartz sand, 50-80 mesh quartz sand, water reducer, retarder, dispersible latex powder, polypropylene short Fiber and water are used as raw materials, and by adjusting the types of cementitious materials, admixtures, aggregates and admixtures, the preparation has high mechanical strength, good initial fluidity, convenient printing and construction, and achieves the strength and durability of concrete for high-rise buildings. Performance requirements, while ensuring the collapse resistance and aesthetics of the printed components, suitable for 3D printed concrete materials in cast-in-place construction operations.

Description

technical field [0001] The invention relates to the technical field of cement-based building materials, in particular to a material suitable for 3D walls with a shear force greater than concrete and a preparation method thereof. Background technique [0002] With the advancement of science and technology and the development of technology, 3D printing technology has advanced by leaps and bounds and entered various fields of the manufacturing industry. 3D printing technology refers to the use of a printer that can "print" a real three-dimensional object, using layered processing and superposition molding to add materials layer by layer to finally create a three-dimensional object. Since there are many forms of specific stacking, a variety of 3D printing processes have been produced, and the types of materials that can be printed by each process are different, but the basic principle is the same, that is, "layer-by-layer manufacturing, layer-by-layer stacking", also known as "...

AI Technical Summary

Problems solved by technology

However, if the printing materials can meet the safety requirements of multi-storey or even small high-rise buildings in areas with an earthquake intensity of 7 degrees, the minimum compressive strength of materials suitable for building 3D printing must reach 20.0MPa, which must meet the requirements of high-rise and super high-rise buildings in the same earthquake intensity area. According to regional safety requirements, the compressive strength should reach above 35.0MPa. The standards for building 3D printing materials have been blank. Most of the foreign research on building 3D printing uses Portland cement and then adds admixtures for improvement. There is no problem with the printing effect at all, but the production cost of printing materials is very high, and it is unrealistic to popularize such a technology in an all-round way

[0005] The existing general Portland cement materials have a long setting time, usually 6 to 10 hours, and the final setting time is about 24 hours, which usually cannot meet the performance requirements of the rapid setting of the material in a short time during the 3D printing process; and the cement paste It is generally fluid and cannot meet the vertical stacking performance in the 3D printing process

In order to make the cement slurry meet the printing requirements, it is necessary to add a large amount of admixtures, which will lead to a significant increase in its cost, so it is not the best choice for architectural 3D printing materials

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