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Composite cementitious material and its preparation method and application

A technology of composite gelling materials and powders, which is applied in the field of new building materials, can solve problems such as the inability to apply 3D printing, and achieve the effects of alleviating poor thixotropy, improving compression resistance, and reducing costs

Active Publication Date: 2021-02-12
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first object of the present invention is to provide a composite cementitious material. By adding red mud, the composite cementitious material not only improves the compressive performance of 3D printing building materials, but also effectively relieves the pressure of existing cement-based materials. Thixotropy is not good, so it cannot be applied to 3D printing

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  • Composite cementitious material and its preparation method and application
  • Composite cementitious material and its preparation method and application
  • Composite cementitious material and its preparation method and application

Examples

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preparation example Construction

[0069] According to one aspect of the present invention, a kind of preparation method of above-mentioned composite gelling material, described preparation method comprises the following steps:

[0070] The solid powder material and the liquid material are evenly mixed to obtain a composite gel material.

[0071] In the preparation method of the composite gel material provided by the invention, the above preparation method uniformly mixes the solid powder material and the liquid material to obtain the composite gel material. The preparation method has the advantages of simple preparation process, convenient operation, easy implementation, no special processing equipment and the like in the preparation process.

[0072] In a preferred embodiment of the present invention, the preparation method comprises the following steps:

[0073] (a), mixing red mud, hydraulic cementitious material, admixture aggregate and water reducing agent to obtain solid powder;

[0074] (b), dissolvin...

Embodiment 1

[0084] A composite gelling material for 3D printing architecture, in parts by mass, the composite gelling material includes solid powder and liquid material, wherein:

[0085] The solid powder is composed of the following components in terms of mass percentage: red mud 15wt%, fly ash 9wt%, iron tailings 75wt%, FDN water reducer 1wt%;

[0086] The aqueous solution of the alkali activator is composed of the following components in terms of mass percentage: 20wt% sodium silicate and 80wt% water;

[0087] The mass ratio of the solid powder material to the liquid material is 100:16;

[0088] The preparation method of the above-mentioned composite cementitious material for 3D printing architecture comprises the following steps:

[0089] (a), red mud, admixture, aggregate and FDN water reducer are mixed to obtain solid powder;

[0090] (b) Mixing the solid powder obtained in step (a) with an aqueous solution of an alkali activator to obtain a composite gelling material.

Embodiment 2

[0092] A composite gelling material for 3D printing architecture, in parts by mass, the composite gelling material includes solid powder and liquid material, wherein:

[0093] The solid powder is composed of the following components in terms of mass percentage: red mud 25wt%, 42.5# ordinary Portland cement 7wt%, fly ash 9wt%, iron tailings 58wt%, FDN water reducer 1wt% ;

[0094] The aqueous solution of the alkali activator is composed of the following components in terms of mass percentage: 25wt% sodium silicate and 75wt% water;

[0095] The mass ratio of the solid powder material to the liquid material is 100:20;

[0096] The preparation method of this embodiment is the same as that of Example 1.

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Abstract

The invention provides a composite gelling material and its preparation method and application, and relates to the technical field of new building materials. The composite cementitious material includes solid powder and liquid material, wherein the solid powder includes red mud, hydraulic cementitious material, admixture, aggregate and water reducing agent, and the liquid material includes alkali activator aqueous solution. The composite cementitious material prepared from the above raw materials, by adding red mud, not only improves the compressive and flexural strength of 3D printing building materials, but also effectively alleviates the poor thixotropy and setting time of existing cement-based materials. Slower and cannot be applied to 3D printing problems. At the same time, turning waste into treasure reduces the cost of 3D printed buildings.

Description

technical field [0001] The invention relates to the technical field of new building materials, in particular to a composite gelling material and its preparation method and application. Background technique [0002] Red mud is the polluting waste slag discharged when the aluminum industry extracts alumina. Generally, for every ton of alumina produced, 1.0 to 2.0 tons of red mud will be produced incidentally. In recent years, with the continuous development of the aluminum smelting industry, the annual discharge of red mud is increasing. However, there is a lack of relatively mature and large-scale application technologies for red mud in the existing technology, which has resulted in a large amount of red mud that cannot be fully utilized. Effective utilization can only rely on large-area storage yards, which not only takes up a lot of land, but also causes serious pollution to the environment. [0003] 3D printing is an innovative rapid prototyping process that uses a 3D pri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/02C04B28/04
CPCC04B28/02C04B28/04C04B2111/00181C04B2201/50C04B18/0409C04B18/08C04B18/12C04B24/22C04B12/04
Inventor 张以河张娜袁健博魏琦宋帅
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)