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A polycarboxylate water reducer for prestressed high-strength concrete pipe piles and its application

A technology of high-strength concrete and water-reducing agent, applied in the field of concrete admixtures, can solve the problems of high requirements, complex process, unfavorable industrial production, etc., and achieve the effects of low air entrainment, abundant sources, and not easy to hang slurry.

Inactive Publication Date: 2016-07-06
太仓新亚逊生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above methods can obtain relatively ideal products, the process is complicated and the requirements are high, which is not conducive to industrial production.

Method used

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  • A polycarboxylate water reducer for prestressed high-strength concrete pipe piles and its application
  • A polycarboxylate water reducer for prestressed high-strength concrete pipe piles and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 59g of methallyl polyoxyethylene ether 2400 (HPEG2400), 30g of isoprenol polyoxyethylene ether 2400 (TPEG2400), 8.9g of acrylic acid, 0.6g of sodium methacryl sulfonate, N-methylol propylene Amide 0.45g, mercaptopropionic acid 0.2g, mass fraction of 30% hydrogen peroxide 0.65g, vitamin C 0.2g.

[0028] Add 70g of soft water, 0.65g of 30% hydrogen peroxide, 59g of HPEG2400, and 30g of TPEG2400 into a four-neck flask equipped with a thermometer, a speed-adjustable stirrer, a reflux condenser, and a dropping device, then stir and heat to about 80°C. Next, add dropwise an aqueous solution composed of 8.9g of acrylic acid, 0.6g of sodium methacrylsulfonate, 0.45g of N-methylolacrylamide, and 0.2g of mercaptopropionic acid. g of vitamin C aqueous solution, drop it in 210 minutes, keep it warm for 90 minutes, then cool down to 50°C, and then adjust the pH value to 7 with a mass fraction of 30% sodium hydroxide solution to obtain 40% of the required polycarboxylate superpl...

Embodiment 2

[0030] Take methallyl polyoxyethylene ether 2400 (HPEG2400) 59g, prenol polyoxyethylene ether 2400 (TPEG2400) 30g, acrylic acid 4.5g, maleic anhydride 4.4g, sodium methacrylate sulfonate 0.7g, N-methylolacrylamide 0.35g, mercaptopropionic acid 0.2g, 30% hydrogen peroxide 0.65g, vitamin C 0.2g.

[0031] Add 75g of soft water, 0.65g of 30% hydrogen peroxide, 59g of HPEG2400, and 30g of TPEG2400 into a four-necked flask equipped with a thermometer, a speed-adjustable stirrer, a reflux condenser, and a dropping device, then stir and heat to about 80°C. Next, add dropwise an aqueous solution composed of 4.5g of acrylic acid, 4.4g of maleic anhydride, 0.7g of sodium methacrylate, 0.35g of N-methylolacrylamide, and 0.2g of mercaptopropionic acid, and drop them in 180 minutes. At the same time, 0.2g of vitamin C aqueous solution was added dropwise for 210 minutes, kept for 90 minutes, then cooled to 50°C, and then adjusted to pH 7 with 30% sodium hydroxide solution to obtain 40% of th...

Embodiment 3

[0033] Take methallyl polyoxyethylene ether 2400 (HPEG2400) 59g, prenol polyoxyethylene ether 2400 (TPEG2400) 30g, acrylic acid 5.9g, maleic anhydride 3g, sodium methacrylate sulfonate 0.7g, N -Methylolacrylamide 0.35g, mercaptopropionic acid 0.2g, 30% hydrogen peroxide 0.65g, vitamin C 0.2g.

[0034] Add 75g of soft water, 0.65g of 30% hydrogen peroxide, 59g of HPEG2400, and 30g of TPEG2400 into a four-necked flask equipped with a thermometer, a speed-adjustable stirrer, a reflux condenser, and a dropping device, then stir and heat to about 80°C. Next, add dropwise an aqueous solution composed of 8.9g of acrylic acid, 4.4g of maleic anhydride, 0.6g of sodium methacrylate, 0.45g of N-methylol acrylamide, and 0.2g of mercaptopropionic acid. After dropping, add 0.2g vitamin C aqueous solution dropwise at the same time, finish dropping for 220 minutes, keep warm for 90 minutes, then cool down to 50°C, and then adjust the pH value to 7 with a mass fraction of 30% sodium hydroxide so...

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Abstract

The invention discloses a polycarboxylic acid water reducer for a pre-stressed high-strength concrete pipe pile. The water reducer comprise the following components: methallyl polyoxyethylene ether 2400, isoprenol polyoxyethylene ether 2400, acrylic acid, maleic anhydride, sodium methacryl sulfonate, N-hydroxymethyl acrylamide, a 30% sodium hydroxide solution, a chain transfer agent, an oxidant, a reductant, a water softener and a 30% sodium hydroxide solution used for adjusting the pH value of the solution, wherein the mass ratio of methallyl polyoxyethylene ether 2400 to isoprenol polyoxyethylene ether 2400 is 1:(0.5-2) and the mass ratio of acrylic acid to maleic anhydride is 1:(0-1). The polycarboxylic acid water reducer disclosed by the invention is reliable in quality and when the polycarboxylic acid water reducer is applied in concrete, the concrete has the advantages of low entrained air, short setting time, high strength, good cohesiveness, easiness for centrifugal dehydration and less in possibility of pulp hanging.

Description

Technical field: [0001] The invention relates to the technical field of a concrete admixture, and more specifically relates to a polycarboxylate-based water reducer and its application. Background technique: [0002] Concrete is the largest and most widely used building material in the world. Concrete water reducer is an admixture used in concrete mixing and construction. Its function is to increase the fluidity of concrete and realize long-distance and pipeline transportation of concrete. Water reducer is a must-use in the process of modern concrete construction. admixture. [0003] Water reducing agent is an indispensable and important component in concrete, and its performance has an important impact on the quality of concrete. At present, the polycarboxylate water reducer used in concrete construction belongs to the third generation of water reducer. Productivity, reduced labor intensity, environmental protection and safety, adjustable functions, concrete cohesion, et...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/32C04B103/30
Inventor 陈华成王小兵
Owner 太仓新亚逊生物科技有限公司
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