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Polycarboxylic acid-lignin composite additive

A polycarboxylic acid and lignin technology, applied in the field of concrete admixtures, can solve the problems of incompatibility between naphthalene-based water-reducing agent and polycarboxylate water-reducing agent, and achieve the improvement of concrete quality, water reduction rate and cost reduction. Effect

Inactive Publication Date: 2012-10-17
上海市建筑构件制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are often incompatibility problems between naphthalene-based water reducers and polycarboxylate water reducers, which makes many concrete manufacturers who use polycarboxylate admixtures reluctant to use admixtures containing naphthalene-based water reducers

Method used

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  • Polycarboxylic acid-lignin composite additive
  • Polycarboxylic acid-lignin composite additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In percent by weight: polycarboxylate superplasticizer (mass solid content: 20%) 38.5%, lignin superplasticizer 11%, air-entraining agent 0.1%, slump-retaining agent 2%, retarder 0.6%, water 47.8 %, add to the stirring tank in turn, and mix well to get this product. Adding this admixture accounting for 1% of the weight of cement can make the fluidity of the cement slurry with a water-cement ratio of 0.35 be 190mm. Adding 1% of the admixture to the concrete, the water-reducing rate of the concrete is 17%, the slump loss is 10mm in 1 hour, the setting time is extended for 2 hours, and the compressive strength ratio reaches 120% in 28 days.

Embodiment 2

[0026] In terms of weight percentage ratio: polycarboxylate water reducer (mass solid content is 20%) 45%, lignin water reducer 5%, air entraining agent 0.1%, early strength agent 2%, tap water 47.9%, add to Stir the tank, mix evenly to get this product. Adding this admixture accounting for 1.2% of the weight of cement can make the fluidity of the cement paste with a water-cement ratio of 0.35 be 210mm. Adding this admixture accounting for 1.2% of the total weight of the cementitious material in the concrete, the water-reducing rate of the concrete is 19%, the slump loss in 1 hour is 15mm, the 7-day compressive strength ratio is 130%, and the 28-day compressive strength ratio is 130%. is 115%.

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Abstract

The invention discloses a polycarboxylic acid-lignin composite additive. The additive is characterized in that: the additive is composed of the components of, by weight: 20-45% of a polycarboxylic acid water reducer, 1-11% of a lignin water reducer, 0.01-0.5% of an air-entraining agent, 0-3% of a slump-retaining agent, 0-0.9% of a retarding agent, 0-3% of an early strength agent, and 39-66% of water. The total amount of the components accounts for 100% by mass. When the contents of the slump-retaining agent and the retarding agent are not 0, the content of the early strength agent is 0. When the content of the early strength agent is not 0, the contents of the slump-retaining agent and the retarding agent are both 0. According to the invention, the polycarboxylic acid water reducer and the lignin water reducer are complexed. Compared with a single polycarboxylic acid water reducer or a single lignin water reducer, under a same concrete water reducing rate, the dosage of the polycarboxylic acid component is reduced, and the cost is reduced. The quality of the concrete is easy to control, and quality fluctuation is reduced. The water reducing rate of the concrete is improved. When the additive is added into concrete, the quality of the concrete is improved.

Description

technical field [0001] The invention relates to a concrete admixture composed of polycarboxylic acid and lignin. Background technique [0002] In recent years, with the successful development and large-scale application of a new generation of polycarboxylate high-performance water reducers, the concrete admixture industry in my country has gradually changed from a concrete admixture system based on lignin and naphthalene-based high-efficiency water reducers to A system based on lignin and polycarboxylate-based high-performance water reducers. Based on the double consideration of production cost and construction quality assurance, concrete production enterprises and construction units have basically formed the use pattern of lignin water reducer for medium and low grade concrete and polycarboxylate water reducer for high grade concrete in the industry. [0003] However, after the implementation of the national standard "Concrete Admixture" GB8076-2008 and the Shanghai Enginee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C04B24/18
Inventor 冯为民王强宋海燕杨储冬孙丽华卢金国
Owner 上海市建筑构件制品有限公司
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