Magnesium oxychloride aeolian sand composite material capable of being subjected to 3D printing as well as preparation method and application thereof

Abstract

The invention provides a magnesium oxychloride aeolian sand composite material capable of being subjected to 3D printing, and relates to the technical field of building materials. The magnesium oxychloride aeolian sand composite material comprises the following components in parts by weight: 0.9-1.1 parts of magnesium oxide powder, 0.4-0.6 part of magnesium chloride hexahydrate, 2.0-4.0 parts of aeolian sand, 0.4-0.6 part of water, 0.1-0.2 part of fly ash, 0.1-0.2 part of silica fume and 0.003-0.008 part of cellulose ether; the magnesium oxide powder comprises MgO with the mass content of 70% or above and the balance being MgCO3 and CaO. The magnesium oxychloride aeolian sand composite material is extremely low in static yield stress, dynamic yield stress and plastic viscosity, extrudate is continuous and free of breakage, and the magnesium oxychloride aeolian sand composite material is more suitable for 3D printing; and the early shrinkage strain is -0.0028, the 28d compressive strength is 35-57 MPa and the breaking strength is 7-13.1 MPa within 8 hours under a high aggregate ratio.

Description

technical field

[0001] The invention relates to the technical field of building materials, in particular to a 3D-printable magnesium oxychloride aeolian sand composite material and a preparation method and application thereof. Background technique

[0002] In recent years, 3D printing technology has achieved remarkable development in the field of civil engineering. Examples of 3D printed bridges and 3D printed houses are often reported, which largely confirm the feasibility of applying 3D printing technology to the field of civil engineering. 3D printing concrete technology has also been widely concerned and promoted because of its many advantages such as design freedom, construction flexibility, fast construction speed, low labor cost, and high degree of automation. Among them, the preparation of 3D-printable cement-based materials is the key to promote the application of this technology in engineering practice. However, most of the aggregates used in existing 3D-printable ...

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