Anticorrosive composite polycarboxylate superplasticizer with high slump loss resistance, and preparation method and application thereof

A composite water-reducing agent and polycarboxylic acid technology, which is applied in the field of concrete additives, can solve the problems of polycarboxylate water-reducing agent being prone to mildew and odor, poor slump retention effect, etc., and achieves stable long-term storage performance, enhanced mutual solubility, excellent water reduction effect

Inactive Publication Date: 2016-02-24
TONGJI UNIV
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of anti-corrosion high-slump polycarboxylate composite water-reducer and its preparation method and application in order to overcome the defect existing in the above-mentioned prior art, which is used to solve the problems of the existing polycarboxylate water-reducer during storage. Moldy and smelly, poor slump retention effect in high temperature construction environment and other technical problems, can achieve high fluidity and high slump retention effect of fresh concrete without increasing the amount of polycarboxylate composite water reducer

Method used

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  • Anticorrosive composite polycarboxylate superplasticizer with high slump loss resistance, and preparation method and application thereof
  • Anticorrosive composite polycarboxylate superplasticizer with high slump loss resistance, and preparation method and application thereof
  • Anticorrosive composite polycarboxylate superplasticizer with high slump loss resistance, and preparation method and application thereof

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Embodiment 1-7

[0040] Under normal temperature and pressure, each component is prepared according to the mass percentage of each component in each embodiment in Table 1, and the prepared polycarboxylate superplasticizer mother liquor, sodium gluconate, air-entraining agent, defoaming agent Antiseptic, antiseptic and bactericide, emulsifier and water are placed in a container and stirred until uniform, and the antiseptic and high slump retention polycarboxylate composite water reducer is prepared.

[0041] In each embodiment, the air-entraining agent adopts sodium lauryl sulfate; the defoamer adopts modified polydimethylsiloxane; One of them; the emulsifier uses nonylphenol polyoxyethylene ether.

[0042] Add water to the mixture mainly composed of cement, fly ash, sand and stone, and stir for 1-10 minutes to obtain concrete. The mass ratio of polycarboxylic acid composite water reducer to concrete cementitious material is 0.1-0.15:100, According to the weight percentage listed in Table 1, t...

Embodiment 8

[0054] In this embodiment, an anti-corrosion and high-slump polycarboxylate composite water-reducer is composed of the following components and mass percentage content: polycarboxylate water-reducer mother liquor 46%, sodium gluconate 6%, air-entraining agent 0.2%, defoaming agent 0.2% of emulsifier, 0.1% of emulsifier, 0.3% of preservative and fungicide, and 47.2% of water.

[0055] Among them, the polycarboxylate water reducer mother liquor is a TPEG type polycarboxylate mother liquor with a solid content of 40%; the air-entraining agent is selected from commercially available sodium lauryl sulfate; The solid content of methyl siloxane is 20%; the emulsifier is selected from commercially available nonylphenol polyoxyethylene ether; the antiseptic and bactericide is selected from sodium benzoate and sodium sorbate.

[0056] The preparation method of the anti-corrosion high-slump polycarboxylate composite water-reducer in this embodiment specifically includes the following ste...

Embodiment 9

[0061] This embodiment is an anti-corrosion high-slump polycarboxylate composite water-reducer, which is composed of the following components and mass percentage content: polycarboxylate water-reducer mother liquor 52%, sodium gluconate 6%, air-entraining agent 0.3%, defoaming 0.1% of emulsifier, 0.2% of emulsifier, 0.1% of preservative and bactericide, and 41.3% of water.

[0062] Among them, the polycarboxylate water reducer mother liquor is a TPEG type polycarboxylate mother liquor with a solid content of 40%; the air-entraining agent is selected from commercially available sodium lauryl sulfate; Methyl siloxane, the solid content is 20%; the emulsifier is selected from commercially available nonylphenol polyoxyethylene ether; the antiseptic and bactericide are sodium benzoate, sodium nitrite and isothiazolinone.

[0063] The preparation method of the anti-corrosion high-slump polycarboxylate composite water-reducer in this embodiment specifically includes the following ste...

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Abstract

The invention relates to an anticorrosive composite polycarboxylate superplasticizer with high slump loss resistance, and a preparation method and application thereof. The composite polycarboxylate superplasticizer comprises, by mass, 40 to 55% of mother liquor of a polycarboxylate superplasticizer, 4 to 7% of sodium gluconate, 0.15 to 0.3% of an air entraining agent, 0.1 to 0.25% of an antifoaming agent, 0.05 to 0.2% of an emulsifying agent and 0.1 to 0.3% of an anticorrosive bactericide, with the balance being water, wherein the mass percents of every component sum to 100%. The composite polycarboxylate superplasticizer is prepared by placing the mother liquor of the polycarboxylate superplasticizer, sodium gluconate, the air entraining agent, the antifoaming agent, the anticorrosive bactericide and the water in a container together according to the above-mentioned mass percents under the conditions of normal temperature and normal pressure and carrying out uniform mixing under stirring. In use, the composite polycarboxylate superplasticizer is added into a concrete cementing material according to a mass ratio of the composite polycarboxylate superplasticizer to the concrete cementing material of 0.1-0.15: 100. Compared with the prior art, the composite polycarboxylate superplasticizer provided by the invention has the advantages of convenience in usage, stable performance, no phenomena of mildew, smelliness and layering due to long-term storage, capacity of introducing small bubbles when used in fresh mixed concrete, and excellent water-reducing and slump-retaining performances.

Description

technical field [0001] The invention belongs to the technical field of concrete additives, and relates to a water reducer and its preparation method and application, in particular to an anti-corrosion high slump retention polycarboxylic acid composite water reducer and its preparation method and application. Background technique [0002] As we all know, water reducing agent is an important concrete admixture, which can greatly reduce the water-cement ratio of concrete, increase fluidity, improve the construction performance of concrete, and improve the strength and durability of concrete. In recent years, the field of high-performance water-reducing agents has achieved rapid development at home and abroad, and its application in engineering has become more and more extensive. Therefore, the superior performance of water-reducing agents has attracted great attention in the field of concrete engineering. [0003] Polycarboxylate water reducer is the third generation of concret...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42C04B103/30
CPCC04B40/0039C04B2103/302C04B24/24C04B24/10C04B2103/304C04B2103/50C04B2103/0068C04B2103/67C04B24/16C04B24/42C04B24/32C04B24/04C04B22/085
Inventor 张雄何燕顾明东洪万领
Owner TONGJI UNIV
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