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Submicron inorganic whisker reinforced aerogel foam concrete and preparation method thereof

A foam concrete and inorganic whisker technology, which is applied in the field of submicron inorganic whisker-reinforced airgel foam concrete and its preparation, can solve the contradiction between density, thermal conductivity and compressive strength, complex preparation process, airgel and concrete Combining the problems of low degree to achieve the effects of enhancing mechanical properties and flexibility, simplifying the preparation process, and reducing thermal bridges

Active Publication Date: 2019-03-15
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Overcome the contradiction between foam concrete density, thermal conductivity and compressive strength in the prior art
Overcome the problems of complex preparation process and low degree of combination of airgel and concrete in the prior art

Method used

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  • Submicron inorganic whisker reinforced aerogel foam concrete and preparation method thereof
  • Submicron inorganic whisker reinforced aerogel foam concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This embodiment prepares calcium sulfate submicron whisker / SiO 2 Airgel foam concrete, based on SiO 2 Airgel powder is used as filling material, its particle size is 60 mesh (about 250μm), porosity is 90%, pore diameter is 100nm; calcium sulfate submicron whiskers are used as reinforcement, its diameter is 100nm, aspect ratio is 100. In a uniformly dispersed state. Concrete preparation steps are as follows:

[0042] (1) Mix water and sodium bentonite according to a mass ratio of 1000:1, and stir evenly to obtain thickened water;

[0043] (2) Combine the composite Portland PO42.5 cement with SiO 2 The airgel powder is dry-mixed, then the thickened water obtained in step (1) is added, and stirred evenly to obtain SiO 2 Airgel concrete paste; among them composite Portland PO42.5 cement, SiO 2 The mass ratio between airgel powder and thickening water is 1:0.10:0.7;

[0044] (3) Slowly add the dispersed calcium sulfate submicron whiskers to the SiO obtained in step (2)...

Embodiment 2

[0048] This example prepares SiC submicron inorganic whisker / clay airgel foam concrete, using clay airgel powder as the filling material, its particle size is 70 mesh (about 212 μm), porosity is 93%, and pore diameter is 60nm ; SiC submicron inorganic whiskers are used as reinforcements, with a diameter of 500nm, an aspect ratio of 1000, and a uniformly dispersed state. Concrete preparation steps are as follows:

[0049] (1) Mix water and diatomaceous earth in a mass ratio of 1000:5, and stir evenly to obtain thickened water;

[0050] (2) dry-mix magnesium oxychloride PO42.5 cement with clay airgel powder, then add the thickening water prepared in step (1), stir evenly, and obtain clay airgel concrete slurry; The mass ratio between magnesium PO 42.5 cement, clay airgel powder and thickening water is 1:0.2:0.8;

[0051] (3) Slowly add dispersed SiC submicron inorganic whiskers into the clay airgel concrete slurry obtained in step (2), and stir evenly to obtain SiC submicron i...

Embodiment 3

[0055] This embodiment prepares Si 3 N 4 Submicron inorganic whisker / carbon airgel foam concrete is filled with carbon airgel powder, with a particle size of 80 mesh (about 180μm), a porosity of 95%, and a pore diameter of 30nm; Si 3 N 4 Submicron inorganic whiskers are reinforcements with a diameter of 1um and an aspect ratio of 10,000 in a uniformly dispersed state. Concrete preparation steps are as follows:

[0056] (1) Mix water and parsley soil in a mass ratio of 100:1, and stir evenly to obtain thickened water;

[0057] (2) dry-mix sulfoaluminate PO 42.5 cement with carbon airgel powder, then add the thickening water prepared in step (1), stir evenly, and obtain carbon airgel concrete slurry; The mass ratio between salt PO 42.5 cement, carbon airgel powder and thickening water is 1:0.3:0.9;

[0058] (3) Dispersed Si 3 N 4 Submicron whiskers are slowly added to the carbon airgel concrete slurry obtained in step (2), and stirred evenly to obtain Si 3 N 4 Submicron...

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Abstract

The invention discloses submicron inorganic whisker reinforced aerogel foam concrete and a preparation method thereof. The preparation raw materials of the submicron inorganic whisker reinforced aerogel foam concrete comprise a cementing material, aerogel powder, submicron inorganic whiskers, a thickening agent, a foaming agent and water, wherein the mass ratio of the cementing material to the aerogel powder to the submicron inorganic whiskers is 1:(0.01-0.3):(0.001-0.01); the diameter of the submicron inorganic whiskers is 100 nm-1 [mu]m, and the length-diameter ratio of the submicron inorganic whiskers is 10-10000; and the size of the submicron inorganic whiskers is closer to the size of nanopores of the aerogel, so that the reinforcement effect is better. The submicron inorganic whiskerreinforced aerogel foam concrete disclosed by the invention has ultralow density and ultralow heat conductivity and also has good compressive strength, and can be applied to the fields such as heat preservation of building walls, road filling, and sound insulation of barriers, thereby having broad application prospects.

Description

technical field [0001] The invention belongs to the field of light-weight, thermal insulation materials, and in particular relates to a submicron inorganic whisker-reinforced airgel foam concrete and a preparation method thereof. Background technique [0002] Foamed concrete is widely used in the construction industry. Because of its low density and low thermal conductivity, it is often used as building insulation materials or wall filling materials. Taking my country, which has a vast territory, as an example, in northern China, foamed concrete is often used as building insulation material; while in southern China, foamed concrete is mainly used for heat insulation of walls. Foam concrete is a lightweight and self-insulating building energy-saving material, but lightweight foam concrete also has certain limitations, such as low strength, water absorption and cracking, etc. Make certain changes in other aspects to optimize its thermal performance. Therefore, the study of f...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B28/06C04B28/32C04B28/08C04B28/02C04B28/10C04B28/14C04B28/26C04B26/00C04B38/10C04B14/38C04B111/28C04B111/52
CPCC04B26/00C04B28/021C04B28/04C04B28/065C04B28/08C04B28/10C04B28/14C04B28/26C04B28/32C04B2111/28C04B2111/52C04B2201/20C04B2201/32C04B2201/50C04B14/104C04B14/064C04B14/383C04B24/34C04B38/106C04B14/10C04B14/08C04B24/14C04B14/102C04B14/028C04B24/10
Inventor 吴会军付平杨丽修徐涛
Owner GUANGZHOU UNIVERSITY
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