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

A 3D printing and composite material technology, applied in the field of magnesium oxychloride aeolian sand composite material and its preparation, can solve the problems of difficult molding, environmental pollution, large early shrinkage, etc.

Active Publication Date: 2021-04-16
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a 3D printable magnesium oxychloride aeolian sand composite material and its preparation method and application. The 3D printable magnesium oxychloride aeolian sand composite material prepared by the technical scheme of the present invention can use aeolian sand Replacing river sand or machine-made sand as aggregate can avoid the environmental pollution problems caused by the use of ordinary Portland cement and the development of river sand or the manufacture of machine-made sand, and overcome the problems of difficult molding and early shrinkage caused by the use of aeolian sand. The printed product has good 3D printing performance, crack resistance and high strength

Method used

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

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preparation example Construction

[0037] The present invention also provides a preparation method of the 3D-printable magnesium oxychloride aeolian sand composite material described in the above technical solution, comprising the following steps:

[0038] (1) mixing magnesium oxide powder, aeolian sand, fly ash and silica fume to obtain a mixed powder;

[0039] (2) Magnesium chloride hexahydrate is dissolved in water, then mixed with the mixed powder obtained in the step (1), to obtain a prefabricated slurry;

[0040] (3) mixing the prefabricated slurry obtained in the step (2) with cellulose ether to obtain a 3D printable magnesium oxychloride aeolian sand composite material.

[0041] The invention mixes magnesium oxide powder, drift sand, fly ash and silica fume to obtain mixed powder.

[0042] In the present invention, the equipment for mixing the magnesium oxide powder, aeolian sand, fly ash and silica fume is preferably a concrete mixer. In the present invention, the mixing time of the magnesium oxide p...

Embodiment 1

[0055] In Example 1, the magnesium oxychloride aeolian sand composite material that can be printed in 3D is calculated in parts by weight, and its components are as follows:

[0056] 0.9 parts of magnesium oxide powder of 80-120 μm (MgO mass percentage content is 71.2%, the balance is MgCO 3 and CaO), 0.4 parts of magnesium chloride hexahydrate (mass percentage of magnesium chloride is 45.5%), 0.4 parts of water, 0.1 part of Class I fly ash of 50-100 μm, 0.1 part of silica fume of 10-35 μm, and wind of 100-150 μm 2.0 parts of accumulated sand and 0.005 parts of hydroxypropyl methylcellulose with a water content of 2.1%, a pH value of 6.5 (1% solution, 25°C), and a viscosity of 95 Pa·s (2% aqueous solution, 20°C);

[0057] The preparation method of described 3D printable magnesium oxychloride aeolian sand composite material, concrete steps are as follows:

[0058] (1) Pour magnesium oxide powder, aeolian sand, fly ash and silica fume into a concrete mixer and mix for 2 minutes...

Embodiment 2

[0063] In Example 2, the magnesium oxychloride aeolian sand composite material that can be printed by 3D is calculated in parts by weight, and its components are as follows:

[0064] 1.0 parts of 80-120 μm magnesium oxide powder (MgO mass percentage content is 71.2%, the balance is MgCO 3 and CaO), 0.5 parts of magnesium chloride hexahydrate (mass percentage of magnesium chloride is 45.5%), 3.0 parts of 100-150 μm aeolian sand, 0.5 parts of water, 0.15 parts of 50-100 μm Class I fly ash, 10-35 μm 0.15 parts of silica fume and 0.005 parts of hydroxypropyl methylcellulose with a water content of 2.1%, a pH value of 6.5 (1% solution, 25°C), and a viscosity of 95 Pa·s (2% aqueous solution, 20°C);

[0065] The preparation method of described 3D printable magnesium oxychloride aeolian sand composite material, concrete steps are as follows:

[0066] (1) Pour magnesium oxide powder, aeolian sand, fly ash and silica fume into a concrete mixer and mix for 2 minutes to obtain a mixed po...

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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 ...

Claims

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Application Information

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IPC IPC(8): C04B28/32B33Y70/10B33Y10/00
Inventor 马国伟冯舵王里
Owner HEBEI UNIV OF TECH
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