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Polycarboxylic acid water reducing agent suitable for high-strength self-compacting concrete and preparation method of polycarboxylic acid water reducing agent

A technology of self-compacting concrete and polycarboxylic acid, which is applied in the field of concrete admixtures, can solve the problems of poor segregation resistance, insufficient dispersibility, and high price, and achieve the effect of large fluidity, good dispersibility, and low cost

Active Publication Date: 2014-06-25
CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a polycarboxylate water-reducer suitable for high-strength self-compacting concrete and its preparation method to overcome the insufficient dispersion and excessive viscosity of traditional polycarboxylate water-reducers when preparing high-strength self-compacting concrete. Large, poor segregation resistance, expensive and other disadvantages

Method used

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  • Polycarboxylic acid water reducing agent suitable for high-strength self-compacting concrete and preparation method of polycarboxylic acid water reducing agent
  • Polycarboxylic acid water reducing agent suitable for high-strength self-compacting concrete and preparation method of polycarboxylic acid water reducing agent
  • Polycarboxylic acid water reducing agent suitable for high-strength self-compacting concrete and preparation method of polycarboxylic acid water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In a 500ml four-necked flask equipped with a thermometer, a stirrer and a dropping funnel, add 100g deionized water, 180g isopentenyl polyoxyethylene ether macromonomer (polymerization degree n=26) and 16.0g maleic anhydride , turn on nitrogen, heat in a water bath, control the temperature at about 40°C, stir while heating, after the isopentenyl polyoxyethylene ether macromonomer and maleic anhydride are dissolved, slowly raise the temperature to 60°C, add 2.0g Sodium allyloxyhydroxypropylsulfonate and 1.0 g of ammonium persulfate were added dropwise to 60 g of an aqueous solution containing 4.0 g of acrylic acid and 80 g of an aqueous solution containing 0.25 g of thioglycolic acid, respectively. The dropping time of the acrylic acid aqueous solution is 4 hours, and the dropping time of the thioglycolic acid aqueous solution is 4.5 hours. After the dropwise addition, continue to keep warm at 60°C for 1 hour, then cool down to 40°C, add alkali to neutralize and add deion...

Embodiment 2

[0024] In a 500ml four-necked flask equipped with a thermometer, a stirrer and a dropping funnel, add 100g deionized water, 180g isopentenyl polyoxyethylene ether macromonomer (polymerization degree n=46) and 16.0g maleic anhydride , turn on nitrogen, heat in a water bath, control the temperature at about 40°C, stir while heating, after the isopentenyl polyoxyethylene ether macromonomer and maleic anhydride are dissolved, slowly raise the temperature to 60°C, add 8.0g Sodium allyloxyhydroxypropyl sulfonate and 1.0 g of ammonium persulfate were added dropwise to 60 g of an aqueous solution containing 4.0 g of acrylic acid and 60 g of an aqueous solution containing 0.25 g of thioglycolic acid, respectively. The dropping time of the acrylic acid aqueous solution is 4 hours, and the dropping time of the thioglycolic acid aqueous solution is 4.5 hours. After the dropwise addition, continue to keep warm at 60°C for 1 hour, then cool down to 40°C, add alkali to neutralize and add deio...

Embodiment 3

[0026]In a 500ml four-necked flask equipped with a thermometer, a stirrer and a dropping funnel, add 100g deionized water, 180g isopentenyl polyoxyethylene ether macromonomer (polymerization degree n=46) and 16.0g maleic anhydride , turn on nitrogen, heat in a water bath, control the temperature at about 40°C, stir while heating, after the isopentenyl polyoxyethylene ether macromonomer and maleic anhydride are dissolved, slowly raise the temperature to 60°C, add 10.0g Sodium allyloxyhydroxypropyl sulfonate and 0.6 g of ammonium persulfate were added dropwise to 60 g of an aqueous solution containing 4.0 g of acrylic acid and 60 g of an aqueous solution containing 0.1 g of thioglycolic acid, respectively. The dropping time of the acrylic acid aqueous solution is 4 hours, and the dropping time of the thioglycolic acid aqueous solution is 4.5 hours. After the dropwise addition, continue to keep warm at 60°C for 3 hours, then cool down to 40°C, add alkali to neutralize and add deio...

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Abstract

The invention relates to a polycarboxylic acid water reducing agent suitable for high-strength self-compacting concrete and a preparation method of the polycarboxylic acid water reducing agent. The agent is characterized by comprising 70-90wt% of a isopentene group polyoxyethylene ether monomer a, 5-25wt% of binary unsaturated carboxylic acid and a derivative monomer b of the binary unsaturated carboxylic acid and 1-10wt% of unitary unsaturated carboxylic acid and a derivative monomer c, wherein a+b+c=10wt%, under the action of an initiator and a chain transfer agent, an inductive copolymerization assistant agent monomer d is subjected to copolymerization for 1-3.5h in a water solution at the temperature of 60-80 DEG C, then alkali is added, and neutralization is conducted to obtain the polycarboxylic acid water reducing agent. The water reducing agent is not only can be compounded into an addition agent and used in ordinary concrete and also can be used in the C70-C100 high-strength self-compacting concrete, high mobility and low viscosity are provided, and the requirement (the performance grade can reach SR2) for segregation resistance in engineering construction is met, the performance is excellent, and the construction application requirement is met; and the cost is low, and the agent is convenient to popularize.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a polycarboxylate water reducer suitable for high-strength self-compacting concrete and a preparation method thereof. Background technique [0002] With the development of urban scale, urban land is becoming more and more scarce, and more and more high-rise and super high-rise buildings are being built successively in major cities. According to statistics, China is currently the country with the highest concentration of super high-rise buildings in the world. Among the top ten super high-rise buildings planned and under construction, China has 6 of them. This type of building has a common feature in structural design: complex structure and dense reinforcement. Such structural characteristics are very unfavorable to the pouring construction of ordinary high-strength concrete, and only high-strength self-compacting concrete can be used for pouring. This puts forward m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/32C08F290/06C04B103/30
Inventor 王凤玲邰炜郑广军韩周冰陈景周辉刘行宇纪晓辉顾芳袁明华韩武军何赛李兴傅承飞李康林祁发忠李祥
Owner CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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