Cement-based material used for building 3D (three-dimensional) printing

Abstract

The invention provides a cement-based material used for building 3D (three-dimensional) printing; the cement-based material is high in plasticity and early strength, can be timely adjusted in setting time according to raw material composition and temperature of a construction environment, and is suitable for printing building components different in marks. The cement-based material used for building 3D printing is prepared from the following materials in mixing composition ratios: 400 kg of cementing material, 600 kg of machine-made sand, 3 to 5 kg of de-foaming agent, 3 to 5 kg of thickening agent, 0.9 to 1.0 kg of polypropylene staple fiber, a water reducing agent and a retarder; a water-binder ratio is 0.35 to 0.50, wherein the cementing material is prepared from 150 to 400 kg of sulphate aluminium cement and 0 to 250 kg of coal ash; the machine-made sand is 0.075 to 5 mm in grain size; the polypropylene staple fiber is 3 to 6 mm long; 10 min slump degree of the cement-based material is 90 to 110 mm, initial setting time is 15 to 80 min, and final setting time is 30 to 100 min.

Description

technical field [0001] The invention relates to a cement-based material used for building 3D printing, belonging to the field of building materials. Background technique [0002] 3D printing technology, a type of rapid prototyping technology, is a technology based on digital model files, using bondable materials such as powdered metal, plastic and cement-based materials, to construct objects by layer-by-layer printing. In the past, it was often used to make models in the fields of mold manufacturing and industrial design, and is now gradually being used in the direct manufacture of some products. [0003] The realization of concrete 3D printing technology is based on a cement-based paste material that can be precisely positioned according to computer data and has a highly controllable extrudability. After computer modeling, 3D printing technology can use this material to print layer by layer according to the model. First, the factory components are printed out, then transpo...

AI Technical Summary

Problems solved by technology

The application of 3D printing in the construction industry has not yet formed a scale, and 3D printing of physical buildings is still in the experimental stage

[0006] At present, the construction 3D printing engineering materials in use still have a cement-based concrete mix ratio that is rarely disclosed; the use of ordinary Portland cement and sulphoaluminate cement will cause an increase in the instantaneous loss of the printing material's fluidity, and give Material pumping and printing bring difficulties, and some studies have shown that the mixed cement of the two will cause the strength of cement-based materials to decrease later, so it is not advisable; there are also disadvantages such as high cost and brittleness of building components caused by the large amount of sulfoaluminate cement

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