Lightweight aggregate concrete used for 3D printing and preparation method and application thereof

Abstract

The invention relates to a lightweight aggregate concrete used for 3D printing and a preparation method and an application thereof. The concrete comprises the following components in parts by weight:100 parts of Portland cement, 30 parts of fly ash, 1-5 parts of silicon ash, 20-45 parts of water, 1-5 parts of an accelerator, 1-5 parts of an early strength agent, 1-3 parts of a flocculating agent,and 80-200 parts of a light aggregate. The preparation method comprises the following steps: mixing ceramsite to obtain the light aggregate, then mixing Portland cement, fly ash, silicon ash, the accelerator, and the early strength agent to obtain mixed powder, and uniformly mixing the light aggregate and the mixed powder to obtain a coagulation material, which can be used as the raw material ofa 3D printer construction concrete structure. Compared with the prior art, self weight of the lightweight aggregate concrete is light, pressure of the concrete at middle and upper layers on the concrete at a lower layer during a printing process can be greatly reduced, plastic deformation of the concrete at bottom is reduced, collapse possibility is reduced, and the concrete provides the heat insulation function for the concrete material.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a lightweight aggregate concrete for 3D printing and its preparation method and application. Background technique [0002] Concrete is the most widely used building material in contemporary architecture. With a history of 200 years, it has become a hugely used construction material in contemporary society and has made great contributions to construction projects. However, in traditional construction techniques, the use of concrete produces a high proportion of construction waste. China produces about 600 million tons of construction waste every year. Coupled with the increase in labor costs, the construction industry, which uses a very high amount of concrete, will face a huge challenge. Therefore, in the construction industry, it is necessary to develop a new type of construction material and construction technology to replace the traditional construction process, th...

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Problems solved by technology

[0003] However, there is no mold support for the printed structure during the molding process, which requires the concrete mixture to bear its own weight and other loads, and to set rapidly without deformation to reach the target strength

Traditional concrete materials can no longer meet the requirements of 3D printing technology, and the selection and proportion of concrete materials need to be improved urgently

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