Bi-component cement based composite material for 3D printing as well as preparation method and application thereof

Abstract

The invention discloses a bi-component cement based composite material for 3D (three dimensional) printing as well as a preparation method and application thereof. The bi-component cement based composite material for 3D printing comprises a component A and a component B, wherein the component A is prepared from 34 to 40 percent of sulphate aluminium cement, 0 to 6 percent of inorganic powder, 40 to 44 percent of tailing machine-made sand, 2.5 to 3 percent of high-molecular polymer and the balance of a retarder, a water reducer, a size stabilizer, a defoaming agent and water, the pumping performance can be well kept for a long time, an industrialized process of pre-stirring production in a mixing plant, transportation, and using in a construction site can be realized; the B component is prepared from a coagulate promoting agent, a thixotropic agent, a defoaming agent and water, the component is stable in form and can be stored for a long time or produced in a concentrated manner. After A and B are respectively pumped in a 3D printer, through high-speed stirring and being mixed by an extrusion head, the composite printing material can be extruded out, the time of coagulation is short, the strength is high, the adhesion is good, the stability is strong, the constructive continuity and building strength requirements of building 3D printing can be met, the industrial production and promotion of the cement based 3D printing material are facilitated, and the application of a 3D printing technology in buildings can be effectively promoted.

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 pre-designed 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 aerospace, ...

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