Internal curing material of high-performance concrete and preparation method thereof

A technology of high-performance concrete and super-absorbent materials, applied in the field of building materials, to achieve the effect of strong applicability, no impact on strength and durability, and convenient use

Inactive Publication Date: 2012-03-28
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of engineering practices have shown that if the cracking problem of con

Method used

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  • Internal curing material of high-performance concrete and preparation method thereof
  • Internal curing material of high-performance concrete and preparation method thereof
  • Internal curing material of high-performance concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0055] Example 1:

[0056] A high-performance concrete internal curing material, the internal curing material includes the following components and contents (parts by mass):

[0057] Expanding agent 100;

[0058] Organic super absorbent material 1.25;

[0059] Inorganic water-absorbing material 10;

[0060] Water retention agent 0.25;

[0061] Filler 10.

[0062] A method for preparing high-performance concrete internal curing materials, the method includes the following steps:

[0063] (1) Add 6wt% acrylic acid to the three-necked flask under ice-water bath conditions, drop 30wt% sodium hydroxide solution with a mass concentration of 25% under stirring, and then add 18wt% acrylamide and 20wt% with a mass concentration of 0.1 % N,N'-methylenebisacrylamide, stir evenly, put the mixture into a constant temperature water bath at 35°C, bubbling nitrogen for 2 minutes, add 26wt% ammonium persulfate-sodium sulfite with a mass concentration of 0.5%, and stir After reacting for a period of time,...

Example Embodiment

[0065] Example 2:

[0066] A high-performance concrete internal curing material, the internal curing material includes the following components and contents (parts by mass):

[0067] Expanding agent 100;

[0068] Organic super absorbent material 2.5;

[0069] Inorganic water-absorbing material 10;

[0070] Water retention agent 0.25;

[0071] Filler 10.

[0072] A method for preparing high-performance concrete internal curing materials, the method includes the following steps:

[0073] (1) Add 6wt% acrylic acid to the three-necked flask under ice-water bath conditions, drop 30wt% sodium hydroxide solution with a mass concentration of 25% under stirring, and then add 18wt% acrylamide and 20wt% with a mass concentration of 0.1 % N,N'-methylene bisacrylamide, stir evenly, put the mixture into a constant temperature water bath at 35°C, bubbling nitrogen for 2 minutes, add 26wt% ammonium persulfate-sodium sulfite with a mass concentration of 0.5%, and stir After reacting for a period of time,...

Example Embodiment

[0075] Example 3:

[0076] A high-performance concrete internal curing material, the internal curing material includes the following components and contents (parts by mass):

[0077] Expanding agent 100;

[0078] Organic super absorbent material 2.5;

[0079] Inorganic water-absorbing material 10;

[0080] Water retention agent 0.375;

[0081] Filler 10.

[0082] A method for preparing high-performance concrete internal curing materials, the method includes the following steps:

[0083] (1) Add 6wt% acrylic acid to the three-necked flask under ice-water bath conditions, drop 30wt% sodium hydroxide solution with a mass concentration of 25% under stirring, and then add 18wt% acrylamide and 20wt% with a mass concentration of 0.1 % N,N'-methylenebisacrylamide, stir evenly, put the mixture into a constant temperature water bath at 35°C, bubbling nitrogen for 2 minutes, add 26wt% ammonium persulfate-sodium sulfite with a mass concentration of 0.5%, and stir After reacting for a period of time,...

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Abstract

The invention relates to an internal curing material of high-performance concrete and a preparation method thereof. The internal curing material comprises the following components in parts by mass: 100 parts of expanding agent, 1.0-5.0 parts of organic high water absorption material, 0-50 parts of inorganic water absorption material, 0-1.0 part of water-retaining agent and 0-10 parts of filler. The preparation method of the internal curing material comprises the following steps of: mixing a sodium hydroxide solution, acrylic acid and acrylamide according to a certain mass part, stirring, sequentially adding a cross-linking agent and an initiator, and preparing a acrylic acid/acrylamide copolymer through polymerization; drying, crushing and sieving a reaction product to obtain the organic high water absorption material; and mechanically mixing the water absorption material, the inorganic water absorption material, the expanding agent, the water-retaining agent and the filler to obtain the internal curing material of the high-performance concrete. Compared with the prior art, the concrete prepared by using the product provided by the invention has functions of water retaining, internal curing, crack resistance and the like, meanwhile, the strength and the durability of the concrete are not influenced, and the internal curing material has the main advantage that the concrete prepared by using the internal curing material still has favorable crack resistance under an extremely drought environment.

Description

[0001] Technical field: The present invention relates to building materials, in particular to a high-performance concrete internal curing material and a preparation method thereof. Background technique [0002] Since the introduction of high-performance concrete into our country in the 1990s, it has been more and more widely used in engineering because of its excellent workability and durability. As an important link in the construction process, the maintenance of concrete is the basis for realizing the durability of concrete. T.C.Powers, a famous American scholar, pointed out that the theoretical water-cement ratio of Portland cement hydration should not be less than 0.42. Due to the addition of high-efficiency water reducer and active mineral admixture, the water-cement ratio of high-performance concrete is greatly reduced. (much less than 0.42), there is not enough water in the concrete for the cement to fully hydrate. At the same time, due to the compact structure of high...

Claims

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Application Information

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IPC IPC(8): C04B24/38
Inventor 朱长华李享涛王保江王月华李连吉孔庆欣谢永江
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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