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Aerated concrete prepared from coal ash-nanosilicon dioxide-silica fume as main siliceous material

A technology of nano-silica and aerated concrete, which is applied in the field of building materials, can solve the problems of inability to improve thermal insulation performance and strength, and achieve the effects of improving crystallization degree and crystal quantity, thermal insulation performance and strength improvement, and low cost

Inactive Publication Date: 2014-08-06
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the air-entrained concrete prepared by the existing method improves the performance of the air-entrained concrete in a certain aspect, it cannot improve the thermal insulation performance and strength.

Method used

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  • Aerated concrete prepared from coal ash-nanosilicon dioxide-silica fume as main siliceous material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Put PII52.5 cement, quicklime powder, gypsum, fly ash, nano-silica, and silica fume into the mixer at one time in a dry mass ratio of 107 parts: 223 parts: 20 parts: 604 parts: 33 parts: 40 parts Uniform; then add 35 parts of polycarboxylate high-efficiency water reducer and 2.6 parts of sodium citrate and mix evenly; then add 370 parts of water at 50°C, the water-material ratio is 0.4; gradually increase the motor as the fluidity of the slurry increases Increase the homogenization degree of the slurry system; then add 1.94 parts of water glass and 2 parts of oleic acid-triethanolamine binary mixed solution, continue to stir the slurry, and control the temperature at 38 °C; stabilize 1.3 parts of gum arabic powder Foaming agent, 1.15 parts of aluminum powder and 30 parts of water at 37°C are prepared as a suspension and added into it; after stirring for 1.5 minutes, pour the slurry into a trial mold for casting, and cure for 1.5 hours (temperature 60°C, humidity >90% ),...

Embodiment 2

[0022] Put PII52.5 cement, quicklime powder, gypsum, fly ash, nano-silica, and silica fume into the mixer at one time according to the dry mass ratio of 104 parts: 217 parts: 20 parts: 588 parts: 34 parts: 48 parts Add 35 parts of naphthalene-based high-efficiency water reducer and 2.6 parts of sodium phosphate and mix evenly; then add 370 parts of water at 50°C, the water-material ratio is 0.4; gradually increase the speed of the motor as the fluidity of the slurry increases, Improve the homogenization of the slurry system; add 1.94 parts of water glass and 2 parts of oleic acid-triethanolamine binary mixed solution, and control the temperature at 37 °C; mix 1.4 parts of alkanolamide foam stabilizer, 1.15 parts of aluminum powder and 30 A portion of water at 37°C was made into a suspension and added into it; after stirring for 1.5 minutes, the slurry was poured into a trial mold for casting, cured for 1.5 hours (temperature 60°C, humidity >90%), taken out for static curing, an...

Embodiment 3

[0025] Put PII52.5 cement, quicklime powder, gypsum, fly ash, nano-silica, and silica fume into the mixer at one time according to the dry mass ratio of 102 parts: 223 parts: 21 parts: 576 parts: 34 parts: 48 parts Add 35 parts of high-efficiency fatty acid superplasticizer and 2.8 parts of lignin and mix evenly; then add 370 parts of water at 50°C, and the water-material ratio is 0.4; gradually increase the speed of the motor to increase the The degree of homogenization of the slurry system; add 1.94 parts of water glass and 2 parts of oleic acid-triethanolamine binary mixed solution, the temperature is controlled at 37 ° C; 1.35 parts of gum arabic powder foam stabilizer, 1.15 parts of aluminum powder and 30 parts Water at 37°C is made into a suspension and added into it; after stirring for 1.5 minutes, pour the slurry into a test mold and cast it, and cure it for 1.5 hours (temperature 60°C, humidity >90%), take it out and rest it, and then put it into the kettle at 190°C ,...

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Abstract

The invention provides aerated concrete prepared from coal ash-nanosilicon dioxide-silica fume as main siliceous materials. The aerated concrete comprises at least the following ingredients by weight: 80-150 parts of cement, 180-270 parts of lime, 15-25 parts of gypsum, 550-650 parts of coal ash, 30-45 parts of nanosilicon dioxide, 35-50 parts of silica fume, 30-40 parts of solid water reducers, 1.5-3 parts of retarders, 1.0-1.5 parts of foaming agents, 1.2-1.7 parts of foam stabilizers, 2.1-3.0 parts of water glass, 1.6-2.5 parts of oleic acid-triethanolamine binary mixed solutions and 400-500 parts of water. According to the invention, the aerated concrete is low in cost and simple in preparation technology, and improves the crystalline degree and crystalline quantity of an aerated concrete hydration product tobermorite, so that the thermal insulation property and strength of the aerated concrete are improved.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to an aerated concrete prepared with fly ash-nanometer silicon dioxide-silica fume as the main siliceous material. Background technique [0002] In the context of the sharp increase in energy consumption of buildings and the global call for energy conservation and emission reduction, air-entrained concrete has greatly reduced the energy consumption of buildings due to its good mechanical properties, excellent thermal properties, and superior machinability. consumption. In addition, a large amount of industrial by-products are used in the production process of air-entrained concrete, which protects the environment. As one of the green environmental protection materials, it can not only be used for the exterior wall enclosure, interior wall partition, and flat slope roof of civil buildings, but also can be used for the roof and exterior walls of industrial factories, and can also be...

Claims

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Application Information

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IPC IPC(8): C04B38/02C04B28/10C04B14/06C04B18/08
CPCY02W30/91
Inventor 李敏吴智深彭欢
Owner SOUTHEAST UNIV
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