3D concrete material for printing

Abstract

The invention discloses a 3D concrete material for printing, which is prepared from the following components in percentage by weight: 20 to 30 percent of Portland cement, 12 to 16 percent of sulphoaluminate cement, 6 to 8 percent of compound fiber, 10 to 20 percent of mineral admixture, 20 to 40 percent of compound fine aggregate, 0.5 to 1 percent of water reducing agent, 0 to 1 percent of accelerator, 1 to 2 percent of cellulose ether and 10 to 12 percent of water. According to the 3D printing concrete material disclosed by the invention, the formula of the cementing material is adjusted, and the Portland cement and the sulphoaluminate cement with the early strength characteristic are jointly used as the cementing material, so that the early hydration speed and the early strength of concrete can be adjusted, and a rapid hardening effect is achieved; the recycled fine aggregate is used for partially replacing traditional fine aggregate such as natural river sand, smooth pumping of materials in the 3D printing process is facilitated, and recycling of waste resources can be achieved; the steel fibers and the basalt fibers are used together, so that the investment cost can be reduced, the composite material is more suitable for being used in various environments, and the fiber reinforcement effect can be fully exerted.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and in particular relates to a 3D concrete material for printing. Background technique [0002] Concrete is the most widely used and most economical building material in contemporary architecture. Although it has a history of less than 200 years, it has become the most widely used construction material in the world today, and has made an invaluable contribution to the development and progress of human society. superseded contribution. However, with the continuous acceleration of engineering construction, the disadvantages of high energy consumption and high pollution in the production and application of concrete have gradually emerged, seriously hindering its development. In order to meet the development needs of green manufacturing, the concrete manufacturing process needs to continuously inject fresh blood. [0003] 3D printing (3D-printing), as an important symbol of the third industrial...

AI Technical Summary

Problems solved by technology

The composition of concrete raw materials is simple and rich in sources, which can reduce the amount of 3D printing concrete materials and reduce production costs; the addition of fibers may improve the impermeability of concrete, improve the integrity, ductility and seismic energy consumption of structures; but in actual construction It was found that the hydration rate of Portland cement as the main gel material is too slow, which will directly slow down the construction progress; and the single-mixed fiber has little effect on the interlayer bonding performance, and the interface performance of concrete materials is relatively low. Poor, the bonding strength of the interface is relatively low, and the integrity of the concrete material needs to be improved; moreover, the fine aggregate used in this document is a secondary mix of quartz sand and corundum, and the cost is relatively high. If recycled materials can be used in 3D In the process of printing and construction, it will help the country achieve higher goals of resource optimization, environmental protection and automated construction