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High-crack-resistance foam concrete and preparation method thereof

A foamed concrete, high crack resistance technology, applied in the field of building materials, can solve the problems of large drying shrinkage, limited application of foamed concrete, low strength of foamed concrete, etc., and achieve the effect of improving drying shrinkage and cracking resistance.

Active Publication Date: 2020-10-09
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the water-binder ratio of foamed concrete is large, there is more free water inside, and the lack of aggregates leads to low strength of foamed concrete, large dry shrinkage and easy cracking, which seriously limits the application of foamed concrete
Therefore, how to solve the problems of large dry shrinkage and easy cracking of foamed concrete is the key to solving the current application problems of foamed concrete.

Method used

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  • High-crack-resistance foam concrete and preparation method thereof

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Comparison scheme
Effect test

Embodiment approach 1

[0040] This embodiment provides a high-crack-resistant foam concrete, which consists of the following parts by mass: 1000 parts of cement, 300 parts of fly ash, 500 parts of slag powder, 2 parts of acrylic water-absorbing resin, 5 parts of nano-silica reinforced foaming agent, 300 parts of weakly alkaline water with PH=9, 900 parts of water, 360 parts of shale ceramsite smaller than 10mm and 8 parts of crop straw fiber.

[0041] The concrete preparation steps of above-mentioned high anti-cracking foam concrete are as follows:

[0042] 1) Stir the cement, fly ash, silica fume, water-absorbing resin and water at a speed of 90r / min for 30s in proportion;

[0043] 2) Gradually add shale ceramsite and crop straw fibers to the slurry prepared in step 1) and stir at a speed of 120r / min for 30s;

[0044] 3) Use nano-silica to enhance the foaming agent and PH = 9 weak alkaline water to form foam, and add it to the well-stirred slurry mixture and stir at a speed of 60r / min for 3 minute...

Embodiment approach 2

[0047] This embodiment provides a high-crack-resistant foam concrete, which consists of the following parts by mass: 1000 parts of cement, 100 parts of fly ash, 300 parts of slag powder, 3 parts of ammonium acrylate water-absorbing resin, and 2 parts of nano-zinc oxide reinforced foaming agent , 120 parts of weakly alkaline water with pH=9, 700 parts of water, 300 parts of rubber particles with a particle diameter less than 10mm and 5 parts of wood fiber.

[0048] The concrete preparation steps of above-mentioned high anti-cracking foam concrete are as follows:

[0049] 1) Stir the cement, fly ash, silica fume, water-absorbing resin and water at a speed of 90r / min for 30s in proportion;

[0050] 2) Gradually add rubber particles and wood fibers to the slurry prepared in step 1) and stir at a speed of 120r / min for 30s;

[0051] 3) Use nano-zinc oxide to enhance foaming agent and PH = 9 weak alkaline water to form foam, and add it to the well-stirred slurry mixture and stir at ...

Embodiment approach 3

[0054] This embodiment provides highly crack-resistant foam concrete, which consists of the following parts by mass: 800 parts of cement, 100 parts of fly ash, 200 parts of slag powder, 5 parts of methacrylamidopropyltrimethylammonium chloride water-absorbing resin, nano 4 parts of aluminum oxide reinforced foaming agent, 240 parts of weak alkaline water with pH=9, 500 parts of water, 200 parts of sand with particle diameter less than 10mm and 3 parts of hemp fiber.

[0055] The concrete preparation steps of above-mentioned high anti-cracking foam concrete are as follows:

[0056] 1) Stir the cement, fly ash, silica fume, water-absorbing resin and water at a speed of 90r / min for 30s in proportion;

[0057] 2) Gradually add sand and hemp fiber to the slurry prepared in step 1) and stir at a speed of 120r / min for 30s;

[0058] 3) Use nano-alumina to enhance the foaming agent and PH = 9 weak alkaline water to form foam, and add it to the well-stirred slurry mixture and stir at a...

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Abstract

The invention relates to high-crack-resistance foam concrete and a preparation method thereof. The high-crack-resistance foam concrete is prepared from the following components in parts by mass: 500 to 1800 parts of cementing material, 1 to 5 parts of water-absorbent resin, 100 to 500 parts of aggregate, 60 to 300 parts of weakly alkaline water, 250 to 900 parts of water, 1 to 5 parts of nano reinforced foaming agent and 2 to 10 parts of plant fiber. The preparation method comprises the following steps: 1) uniformly stirring the cementing material, the water-absorbent resin and the water in proportion to obtain slurry; 2) gradually adding aggregates and plant fibers into the slurry prepared in the step 1) on the basis, and stirring to form a slurry mixture which is fully stirred and rich in aggregates and plant fibers; 3) mixing the nano-reinforced foaming agent with weakly-alkaline water to generate foam, adding the foam into the fully-stirred slurry mixture rich in aggregate and plant fibers, and continuing to stir uniformly so that the foam is uniformly distributed in the slurry to form foam concrete slurry; and 4) pouring the foam concrete slurry into a mold, covering, and demolding after the foam concrete is solidified and hardened.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a high-crack-resistant foamed concrete and a preparation method thereof. Background technique [0002] Foam concrete is a kind of porous lightweight concrete material prepared by introducing a large amount of foam into the matrix with cement, fly ash, mineral powder and silica fume as the cementing material. Foamed concrete is widely used in construction projects because of its advantages of high fluidity, low density, heat preservation, sound insulation, earthquake resistance, fire resistance and energy saving. It is of great significance to promote the reform of wall materials and building energy-saving materials in my country. [0003] However, foamed concrete has a large water-to-binder ratio, more free water inside, and less aggregate, resulting in low strength of foamed concrete, large dry shrinkage and easy cracking, which severely limits the application of foam...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B38/00C04B111/40C04B111/34
CPCC04B28/00C04B2111/40C04B2111/343C04B2201/50C04B18/08C04B18/141C04B24/2641C04B20/004C04B18/24C04B22/002C04B22/06C04B2103/42C04B38/00C04B18/26C04B16/04C04B24/2652C04B14/06C04B18/248
Inventor 张亚梅熊远亮
Owner SOUTHEAST UNIV
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