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Enhanced polycarboxylic acid system concrete reducing agent and preparation method therefor

A polycarboxylate-based concrete technology, applied in the field of concrete, can solve the problems of formaldehyde not being environmentally friendly, potential safety hazards, complex preparation process of melamine high-efficiency water reducer, etc., and achieve the effects of good adaptability, enhanced strength, and dense arrangement

Active Publication Date: 2015-11-04
JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of the melamine high-efficiency water reducer used in this invention is complicated, and the raw material formaldehyde used is not environmentally friendly and has potential safety hazards

Method used

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  • Enhanced polycarboxylic acid system concrete reducing agent and preparation method therefor
  • Enhanced polycarboxylic acid system concrete reducing agent and preparation method therefor
  • Enhanced polycarboxylic acid system concrete reducing agent and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Step (1): the preparation of a kind of reinforced polycarboxylate concrete reducer:

[0021] 22% of methallyl polyoxyethylene ether (number-average molecular weight: 1400) polycarboxylate water reducer, 9% N-hydroxyethyl ethylenediamine, 2.5% methyl cellulose, polycarbonate with a molecular weight of 18000 1% vinyl alcohol, 0.2% sodium nitrite and 65.3% water were stirred at 20°C for 4 hours to obtain a reinforced concrete reducer.

[0022] Step (2): Add the above-mentioned reinforced concrete gel reducer with a solid content of 0.3% of the mass of the cementitious material into the concrete, and perform standard curing for 3d, 7d, and 28d.

Embodiment 2

[0024] Step (1): the preparation of a kind of reinforced polycarboxylate concrete reducer:

[0025] 17% of methallyl polyoxyethylene ether (number average molecular weight: 5000) polycarboxylate water reducer, 5% of N,N,N',N'-tetrahydroxyethylethylenediamine, carboxymethyl 3% cellulose, 0.8% polyvinyl alcohol with a molecular weight of 20000, 0.5% sodium nitrite and 73.7% water were stirred at 26°C for 3 hours to obtain a reinforced concrete reducer.

[0026] Step (2): Add the above-mentioned reinforced concrete reducer with a solid content of 0.4% of the mass of the cementitious material into the concrete, and perform standard curing for 3d, 7d, and 28d.

Embodiment 3

[0028] Step (1): the preparation of a kind of reinforced polycarboxylate concrete reducer:

[0029] The methallyl polyoxyethylene ether (number average molecular weight is 8000) polycarboxylate superplasticizer 15%, N-hydroxyethyl ethylenediamine 10%, hydroxyethyl cellulose 3%, molecular weight 25000 0.5% polyvinyl alcohol, 0.1% sodium nitrite and 71.4% water were stirred at 32°C for 2.5 hours to obtain a reinforced concrete reducer.

[0030] Step (2): Add the above-mentioned reinforced concrete reducer with a solid content of 0.5% of the mass of the cementitious material into the concrete, and perform standard curing for 3d, 7d, and 28d.

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Abstract

The invention relates to an enhanced polycarboxylic acid system concrete reducing agent and a preparation method therefor. The enhanced polycarboxylic acid system concrete reducing agent comprises the following raw materials and components in percentage by weight: 15%-27% of a high water reduction polycarboxylic acid water reducing agent, 5%-10% of organic amine compounds, 2.5-5% of cellulose ether, 0.5%-1% of polyvinyl alcohol , 0.1%-0.5% of sodium nitrite and 64.9%-73.7% of water. The enhanced polycarboxylic acid system concrete reducing agent prepared by the method disclosed by the invention has a high water reduction effect, contains a great number of strong polar hydrophilic radicals with high dispersed and chelated capacity, can stimulate the action of concrete to the maximum extent, effectively disperses gelled materials, obviously improves the working performance of the concrete, and has a remarkable enhancing effect on the later strength of the concrete; 10.7%-15.5% of cement in the concrete is reduced, the adaptability is good, and the technical economy benefits of commercial concrete are ensured.

Description

technical field [0001] The invention relates to a reinforced polycarboxylate concrete reducer and a preparation method thereof, belonging to the technical field of concrete. Background technique [0002] The application of concrete in building materials is increasing day by day, and about 20% to 30% of the cement in the concrete glue material is not sufficiently hydrated, which cannot effectively contribute to the cement strength, resulting in waste of cost in concrete application. With the advancement of concrete high-performance application technology, the demand for reducing production costs and improving concrete performance while ensuring concrete strength has further increased. The use of concrete superplasticizers greatly reduces the water consumption of concrete mixtures, but when the amount of different superplasticizers reaches or exceeds the saturation point, segregation and bleeding will occur, which will affect its strength development. Simply using inorganic s...

Claims

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Application Information

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IPC IPC(8): C04B24/38C04B24/12
Inventor 仇影丁蓓石宇王毅姜海东郑春扬
Owner JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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