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Normal temperature water reducing agent with high water reducing rate and excellent dispersibility and preparation method thereof

A water-reducing agent and dispersibility technology, which is applied in the field of normal-temperature water-reducing agent and its preparation, can solve the problems of excessive concrete slump loss, difficulty in realizing the effect of water-reducing agent, and difficulty in controlling the heating temperature, and reduce shrinkage. The effect of cracking rate, increasing water-reducing function and improving stability

Active Publication Date: 2016-09-28
JIANGXI PINGXIANG CITY LIANYOU BUILDING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Based on the above principles, there are many kinds of water reducers on the market, such as naphthalene-based high-efficiency water-reducers, melamine-based high-efficiency water-reducers, sugar-calcium water-reducers, etc., but there is still the problem of rapid loss of concrete slump; Moreover, the above-mentioned water reducers must be heated and reacted during the preparation process, so that the reaction materials can achieve a relatively ideal dispersion performance, and it is best to accurately control the reaction temperature in order to achieve a relatively ideal effect, which will inevitably result in a reduction in production energy consumption. consumption, which increases the production cost; at the same time, the heating temperature is not easy to control, and it is difficult to achieve a more ideal effect of water reducing agent

Method used

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  • Normal temperature water reducing agent with high water reducing rate and excellent dispersibility and preparation method thereof
  • Normal temperature water reducing agent with high water reducing rate and excellent dispersibility and preparation method thereof
  • Normal temperature water reducing agent with high water reducing rate and excellent dispersibility and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Raw material ratio:

[0027] Methallyl polyoxyethylene ether (TPEG) 30%, self-made additives 5%, acrylic acid 10%, triethanolamine 3%, ascorbic acid 3%, caustic soda 4%, water 45%.

[0028] Homemade Auxiliaries: Acrylic acid: 10%, Ammonium persulfate: 10%, Water: 80%.

[0029] The preparation steps include: put half of the formula ratio of water, methallyl polyoxyethylene ether and self-made additives in a reaction vessel without stirring, add acrylic acid, triethanolamine, ascorbic acid after standing for 3 hours, and the other half of the formula ratio of water , The addition process of the above materials needs to be completed within 30 minutes; after stirring the obtained mixture for 2 hours, add caustic soda, and stir evenly to obtain a room temperature water reducer with high water reducing rate and excellent dispersibility.

Embodiment 2

[0031] Raw material ratio:

[0032] Methallyl polyoxyethylene ether (TPEG) 35%, self-made additives 2%, acrylic acid 12%, triethanolamine 2%, ascorbic acid 2%, caustic soda 2%, water 45%.

[0033] Homemade additives: acrylic acid 15%, ammonium persulfate: 8%, water 77%.

[0034] The preparation method is the same as in Example 1.

Embodiment 3

[0036] Methallyl polyoxyethylene ether (TPEG) 40%, self-made additives 1%, acrylic acid 15%, triethanolamine 2%, ascorbic acid 1%, caustic soda 1%, water 40%.

[0037] Homemade additives: acrylic acid 20%, ammonium persulfate: 10%, water 70%.

[0038] The preparation method is the same as in Example 1.

[0039] Performance testing of the prepared water reducer

[0040] Concrete slump retention capacity

[0041] Taking c30 concrete as an example, the mix ratio is shown in Table 1:

[0042] Table 1

[0043]

[0044] The dispersibility and slump retention ability are shown in Table 2:

[0045] Table 2

[0046]

[0047] Samples 1-3 are water reducing agents + Examples 1-3 (sample 1 corresponds to Example 1, wherein the amount of water reducing agent added is 0.2%, and the water reducing agent of the present invention replaces 15% of the water reducing agent); comparative example It is a simple water reducer (commercially available conventional polycarboxylate water red...

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Abstract

The invention discloses a novel normal-temperature water reducer with high water-reducing rate and excellent dispersity. The water reducer is characterized by being prepared from the following components in percentage by weight: 30-40% of methyl allyl polyethenoxy ether, 1-10% of a self-made assistant, 10-20% of acrylic acid, 1-5% of triethanolamine, 1-5% of ascorbic acid, 1-5% of caustic soda flakes and 40-60% of water, wherein the total weight percentage of the components is 100%. The water reducer has the advantages that a heating reaction is not required, the water reducer can be prepared at the normal temperature and is excellent in dispersity, and the production energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a normal temperature water reducer with high water reducing rate (26.1%) and excellent dispersibility (slump / spread / mm 90min 210 / 380) and a preparation method thereof. Background technique [0002] With the needs of construction development, the requirements for concrete technology and dosage are getting higher and higher, and the shrinkage and cracking rate of concrete must be strictly controlled during use to prevent potential safety hazards; in order to solve the above technical problems, the form of adding admixtures such as water reducers To overcome the problem of high shrinkage cracking rate caused by concrete slump loss; the root cause of concrete slump loss lies in the hydration reaction of cement, and the hydration reaction of cement occurs when it encounters water. As the hydration reaction proceeds, part of the free The water is wrapped during the agglomeration of ce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F290/06C04B24/32C04B103/30
Inventor 吴剑东周玉军肖艳飞陈大伟周友斌周敬萍
Owner JIANGXI PINGXIANG CITY LIANYOU BUILDING MATERIAL
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