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Concrete based on micro-nano powder and preparation method of concrete

A concrete, micro-nano technology, applied in the field of building materials, can solve the problems of large specific surface energy, secondary agglomeration, poor durability, etc., achieve uniform strength distribution, compensate for self-shrinkage, and improve durability.

Active Publication Date: 2016-06-22
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The particle size of the above-mentioned ultra-fine powder is small, the specific surface area is large, and the specific surface energy is large, which easily leads to the secondary agglomeration of the ultra-fine powder particles, which makes the strength development of the concrete mixed with the above-mentioned ultra-fine powder uneven. Simultaneously, because of the large surface energy of the above-mentioned ultrafine powder, the self-shrinkage of the concrete mixed with the above-mentioned ultrafine powder increases significantly, which increases the risk of cracking of the concrete and reduces the durability of the concrete; therefore, the existing concrete is often There are problems of low strength, poor durability and easy cracking

Method used

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  • Concrete based on micro-nano powder and preparation method of concrete
  • Concrete based on micro-nano powder and preparation method of concrete
  • Concrete based on micro-nano powder and preparation method of concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In parts by weight, the raw materials are prepared according to the following formula: 1 part of acrylic acid, 0.5 part of acryloyloxyethyltrimethylammonium chloride, 25 parts of allyl polyoxyethylene ether, 0.01 part of ammonium persulfate, 0.01 part of ascorbic acid, 0.01 part of thioglycolic acid, 40 parts of water;

[0037] Mix 1 part of acrylic acid, 0.01 part of thioglycolic acid and 4 parts of water to obtain the second mixture, mix 0.5 parts of acryloyloxyethyltrimethylammonium chloride and 4.5 parts of water to obtain acryloyloxyethyltrimethylammonium chloride Solution, 0.01 part of ascorbic acid and 0.2 part of water are mixed to obtain ascorbic acid solution;

[0038] Put 25 parts of allyl polyoxyethylene ether, 0.01 part of ammonium persulfate and 31.3 parts of water into the reaction kettle, and mix to obtain the first mixture. When the temperature of the above-mentioned first mixture is controlled at 25°C, add Add the second mixture, the acryloyloxyethylt...

Embodiment 2

[0042] In parts by weight, prepare raw materials according to the following formula: 8 parts of methacrylic acid, 4 parts of acryloyloxyethyltrimethylammonium chloride, 45 parts of methallyl polyoxyethylene ether, 1.5 parts of ammonium persulfate, 1 part of ascorbic acid, 0.5 part of thioglycolic acid, 70 parts of water;

[0043] Mix 8 parts of methacrylic acid, 0.5 parts of thioglycolic acid and 15 parts of water to obtain the second mixture, and combine 4 parts of acryloyloxyethyltrimethylammonium chloride with 18 parts of water to obtain acryloyloxyethyltrimethylchloride Ammonium chloride solution, 1 part of ascorbic acid and 12 parts of water are mixed to obtain ascorbic acid solution;

[0044] Put 45 parts of methallyl polyoxyethylene ether, 1.5 parts of ammonium persulfate and 25 parts of water into the reactor, and mix to obtain the first mixture. When the temperature of the above-mentioned first mixture is controlled at 50°C, add Add the second mixture, the acryloylox...

Embodiment 3

[0048]In parts by weight, prepare raw materials according to the following formula: 4 parts of acrylic acid, 2 parts of acryloyloxyethyltrimethylammonium chloride, 40 parts of prenol polyoxyethylene ether, 0.25 part of hydrogen peroxide, 0.25 part of ascorbic acid , 0.1 part of thioglycolic acid, 53.4 parts of water;

[0049] Mix 4 parts of acrylic acid, 0.1 part of thioglycolic acid and 10 parts of water to obtain the second mixture, mix 2 parts of acryloyloxyethyltrimethylammonium chloride with 12 parts of water , mix 0.1 part of ascorbic acid with 2 parts of water to obtain ascorbic acid solution;

[0050] Add the above-mentioned 40 parts of isopentenol polyoxyethylene ether, 0.25 parts of hydrogen peroxide and 29.4 parts of water into the reaction kettle to obtain the first mixture, start stirring and heating, and when the temperature of the above-mentioned first mixture rises to 30 ° C, add to the reactor. The above-mentioned second mixture, the above-mentioned acryloylo...

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Abstract

The invention discloses concrete based on micro-nano powder and a preparation method of the concrete, relates to the field of building materials and solves the problems of low strength, poor durability and high probability of cracking of concrete. Raw materials of the provided concrete based on the micro-nano powder comprise components in percentage by mass as follows: 8%-20% of cement, 15%-30% of sand, 40%-60% of stone, 1%-5% of micro powder, 0.1%-2% of nano powder, 0.02%-0.2% of an amphoteric dispersing agent, 0.01%-0.5% of shrinkage reduction substances and 5%-10% of water, wherein the shrinkage reduction substances are shrinkage reducing agents or expanding agents. The provided concrete based on micro-nano powder has the advantages of high strength, good durability and low probability of cracking.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a concrete based on micro-nano powder and a preparation method thereof. Background technique [0002] Concrete is currently the most used building material in the world. It is widely used in many fields because of its low price, strong bearing capacity and good durability. Benchmark concrete is generally obtained by mixing cementitious material (cement), aggregate (sand and stone) and water in a certain proportion. With the development of concrete technology and the different needs of people, people add admixtures and / or admixtures to the reference concrete to improve the performance of concrete and meet people's use requirements. [0003] In particular, ultrafine powders such as fly ash, metakaolin, mineral powder, silica fume and nanoparticles are more and more widely used as admixtures in concrete. Usually ultrafine powders are distinguished by particle size, including micr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B14/02C04B14/06C04B18/08C04B14/04C04B2103/0068C04B24/04C04B24/12C04B24/023C04B22/14C04B18/146C04B22/10C04B22/068
Inventor 姚燕吴浩高瑞军王玲
Owner CHINA BUILDING MATERIALS ACAD
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