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Water reducing agent for super slump retaining concrete

A technology of slump-retaining agent and water-reducing agent, which is applied in the field of concrete water-reducing agent, can solve the problems of large-scale bleeding and segregation of concrete, and the setting time is not up to standard, and achieves the effect of solving the problem of bleeding and segregation.

Inactive Publication Date: 2019-07-05
刘翠芬
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a water reducer for ultra-slump-retaining concrete, which can realize long-term slump-preservation of concrete, so as to solve the problem of long-term slump-preservation but short-term concrete return to large bleeding, segregation, and setting time. Issues such as non-compliance

Method used

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  • Water reducing agent for super slump retaining concrete

Examples

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Effect test

Embodiment 1

[0017] Example 1: The super-slump-retaining concrete superplasticizer of the present invention is made of the following components and mass percent raw materials: polycarboxylate water-reducer 25%, polycarboxylate slump-retaining agent C series namely Polycarboxylate slump retaining agent C1 8%, retarder namely sodium gluconate 2%, water retaining agent namely acrylic acid 0.1%, air-entraining agent namely sodium lauryl sulfate 0.15%, defoamer namely polydimethylsiloxane Alkanes 0.1%, the remainder is water, and the sum of the mass percentages of each component is 100%. The preparation method of the above-mentioned polycarboxylic acid slump-retaining agent C1 is that the synthetic method is to add 312 parts of polyether macromer isopentenol polyethylene glycol monomethyl ether (2400 molecular weight), 365 parts of deionized water into a 2L three-necked flask , heat and start the agitator to raise the temperature, and at the same time, dissolve 1.6 parts of thioglycolic acid an...

Embodiment 2

[0018]Example 2: The super-slump-retaining concrete superplasticizer of the present invention is made of the following components and mass percent raw materials: polycarboxylate water-reducer 25%, polycarboxylate slump-retaining agent C series 12 %, the retarder is sodium tripolyphosphate 2%, the water retaining agent is the combination of 0.05% hydroxypropyl methylcellulose and 0.5% acrylamide polymer, the air-entraining agent is fatty alcohol polyoxyethylene ether sodium sulfate 0.1 %, the remainder is water, and the sum of the mass percentages of each component is 100%; the above-mentioned polycarboxylate slump retaining agent C series is two raw materials of 6% polycarboxylate slump retaining agent C1 and 6% polycarboxylate slump retaining agent C2 The combination. The preparation method of the above-mentioned polycarboxylic acid slump-retaining agent C1 is that the synthetic method is to add 312 parts of polyether macromer isopentenol polyethylene glycol monomethyl ether ...

Embodiment 3

[0019] Example 3: The super-slump-retaining concrete superplasticizer of the present invention is made of the following components and mass percent raw materials: polycarboxylate water-reducer 25%, polycarboxylate slump-retaining agent C series namely Polycarboxylate slump-retaining agent C2 8%, retarder 2%, the retarder is a combination of white sugar, hydroxyethylidene diphosphonic acid, zinc sulfate, white sugar, hydroxyethylidene diphosphonic acid, zinc sulfate The mass ratio is 1:2:0.5, water retaining agent 0.55% (that is, the combination of 0.05% hydroxypropyl methylcellulose and 0.5% acrylic acid), air-entraining agent is fatty alcohol polyoxyethylene ether sodium sulfate 0.1%, the remaining For water, the sum of the mass percentages of each component is 100%. The preparation method of the above-mentioned polycarboxylic acid slump-retaining agent C2 is that the synthetic method is to add 320 parts of polyether macromonomer isopentenol polyethylene glycol monomethyl eth...

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Abstract

The invention relates to a water reducing agent for super slump retaining concrete, which is prepared from the following raw materials: 20-35% of polycarboxylic acid water reducing agent, 6-14% of polycarboxylic acid slump retaining agent C series, 1-4% of a retarder, 0.05-1% of a water retaining agent, 0.05-0.25% of an air entraining agent, 0-0.1% of a defoaming agent and the balance of water, wherein the sum of the mass percentages of the components is 100%. The polycarboxylic acid slump retaining agent C series is one or a combination of more than one of a polycarboxylic acid slump retaining agent C1, a polycarboxylic acid slump retaining agent C2 and a polycarboxylic acid slump retaining agent C3; the retarder is one or a combination of more than one of sodium gluconate, white granulated sugar, sodium tripolyphosphate, sodium hexametaphosphate, citric acid, oxalic acid, hydroxyethylidene diphosphonic acid, sodium citrate, tannic acid and zinc sulfate. The invention further providesa preparation method of the polycarboxylic acid slump retaining agents C1, C2 and C3. The water reducing agent can achieve long-term slump protection of the concrete, and solves the problems that theconcrete needs long-term slump protection in the concrete, but the concrete returns for a short time to seperate water, the setting time is not up to the standard, and the like.

Description

technical field [0001] The invention relates to a water reducer for concrete, in particular to a water reducer for ultra-slump concrete. Background technique [0002] As a green and environmentally friendly concrete chemical admixture, polycarboxylate water reducer is gradually widely used in the industry because of its excellent water reducing performance. Traditional polycarboxylate superplasticizers can usually achieve good dispersion or water reducing performance. Short-distance transportation has also been greatly improved with the comprehensive application of slump-retaining agents. However, as environmental protection issues have become increasingly prominent, major commercial concrete mixing plants in urban areas and even suburbs have been closed down in large numbers, and concrete for urban construction needs suburban or The supply of more distant mixing plants has brought a serious test to the transportation requirements of commercial concrete. The transportation ...

Claims

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Application Information

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IPC IPC(8): C04B24/38C04B24/42C04B24/26C04B24/16C08F283/06C08F220/06C08F220/20C08F228/02C08F222/02C08F212/14C04B103/30
CPCC04B40/0039C04B24/2694C04B24/165C08F283/065C04B2103/302C04B2103/308C04B24/10C04B24/16C04B24/04C04B24/42C04B22/16C04B24/383C04B24/2652C04B24/166C04B24/003C04B22/142C08F220/06C08F220/20C08F228/02C08F222/02C08F212/14
Inventor 汪咏梅王玉乾王进春吴伟刘昭洋王龙飞康静董树强刘翠芬
Owner 刘翠芬
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