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Metakaolin-based polymer foam concrete and preparation method thereof

A technology of foam concrete and metakaolin, which is applied to ceramic products, other household appliances, household appliances, etc., can solve the problems of low strength, high thermal conductivity, and high energy consumption of foam concrete, and achieve low production energy consumption, low thermal conductivity, Early intensity high effect

Active Publication Date: 2012-10-03
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a metakaolin-based polymer foam concrete and its preparation method to solve the technical problems of existing foam concrete with low strength, high thermal conductivity, large bulk density and high energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A metakaolin-based polymer foam concrete, its components and mass percentage are as follows:

[0041] Metakaolin 64.27%, water glass 34.49%, quicklime 0.64%, foaming agent 0.6%.

[0042] Preparation method: stir and mix dry materials such as metakaolin and quicklime evenly, add alkali activator and water and stir to obtain a uniform slurry; at the same time, dilute the foaming agent and water at 1:15, and use a high-speed mixer to foam; The obtained foam is mixed into the slurry according to the volume ratio, and stirred for 2.5 to 3 minutes until the foam is evenly distributed in the slurry; the final injection molding is performed, the mold is removed after 24 hours, and the dry bulk density, compressive strength and flexural strength are measured after standard curing for 28 days.

[0043] Test result: dry bulk density 1049kg / m 3 , the compressive strength is 19.3MPa, and the flexural strength is 3.8MPa.

Embodiment 2

[0045] A metakaolin-based polymer foam concrete, its components and mass percentage are as follows:

[0046] Metakaolin 60%, water glass 36.20%, quicklime 3%, foaming agent 0.8%.

[0047] Preparation method: stir and mix dry materials such as metakaolin and quicklime evenly, add alkali activator and water and stir to obtain a uniform slurry; at the same time, dilute the foaming agent and water at 1:15, and use a high-speed mixer to foam; The obtained foam is mixed into the slurry according to the volume ratio, and stirred for 2.5 to 3 minutes until the foam is evenly distributed in the slurry; the final injection molding is performed, the mold is removed after 24 hours, and the dry bulk density, compressive strength and thermal conductivity are measured after standard curing for 28 days.

[0048] Test result: dry bulk density 730kg / m 3 , the compressive strength is 4.2MPa, and the thermal conductivity is 0.132 W / (m·K).

Embodiment 3

[0050] A metakaolin-based polymer foam concrete, its components and mass percentage are as follows:

[0051] Metakaolin 62.24%, water glass 33.40%, quicklime 3.11%, foaming agent 1.2%.

[0052] Preparation method: stir and mix dry materials such as metakaolin and quicklime evenly, add alkali activator and water and stir to obtain a uniform slurry; at the same time, dilute the foaming agent and water at 1:15, and use a high-speed mixer to foam; The obtained foam is mixed into the slurry according to the volume ratio, and stirred for 2.5-3 minutes until the foam is evenly distributed in the slurry; finally, it is formed by injection molding, and the mold is removed after 24 hours, and the dry bulk density and compressive strength are measured after standard curing for 28 days.

[0053] Test result: dry bulk density 453kg / m 3 , the compressive strength is 1.5MPa, and the flexural strength is 0.6MPa.

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Abstract

The invention relates to metakaolin-based polymer foam concrete and a preparation method thereof. Metakaolin, coal ash and a coagulation accelerating agent are added into a mixing machine in proportion to be mixed to be uniform, an alkali excitant and water are added in proportion, and mixing is carried out to prepare slurry; while the slurry is prepared, a foaming agent is diluted with water in proportion of 1: 15, a high-speed mixing machine or a vacuum foaming machine is adopted for preparing fine and stable foam; and according to density design requirement, the prepared foam is blended into the uniformly mixed slurry in volume ratio to be mixed and foamed, wherein the volume ratio of the foam to the slurry is (1-4):1, and mixing is carried out for 2.5-3min until the foam is uniformly dispersed in the slurry, thus freshly blended metakaolin-based polymer foam concrete is prepared. Compared with the traditional cement-based foam concrete taking silicate cement as a main cementing material, the metakaolin-based polymer foam concrete has the characteristics of environmental friendliness, higher strength, low thermal conductivity, good heat insulating property and the like, and can be used for producing various foam concrete products.

Description

technical field [0001] The invention relates to a concrete building thermal insulation material and a preparation method thereof, in particular to a foamed concrete building material and a preparation method thereof. Background technique [0002] With the promulgation and implementation of building energy-saving regulations, the development and application of building thermal insulation materials have received widespread attention from all over the world, and new thermal insulation materials have continued to emerge. As a lightweight, heat-insulating, energy-saving, noise-proof, and earthquake-resistant building material, foamed concrete has attracted widespread attention. More and more research has been invested in the development of foamed concrete with small bulk density, high strength and low thermal conductivity. [0003] At present, the cementing materials used in the preparation of foamed concrete are mainly cement, magnesite and gypsum, among which cement-based foame...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B38/02
Inventor 彭小芹黄涛陈超衍耿建强兰聪
Owner CHONGQING UNIV
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