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Preparation method of polycarboxylic acid admixture for machine-made sand high-strength concrete

A technology of high-strength concrete and polycarboxylic acid, which is applied in the field of concrete for building materials, can solve the problems of high water demand, large loss of fluidity, and rough surface morphology of concrete, and achieve excellent slump retention, dispersion and retention, enhanced anchorage, The effect of strong initial dispersion ability

Pending Publication Date: 2022-07-15
YUNNAN CONSTR INVESTMENT HLDG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a preparation method of machine-made sand high-strength concrete polycarboxylate admixture to solve the problems of the prior art due to the influence of machine-made sand multi-faceted prisms, rough surface appearance and high powder content. The problem of high water demand and easy segregation of concrete is to solve the problems of excessive viscosity, low fluidity, and large loss of fluidity caused by low water-binder ratio and large amount of adhesive in existing ultra-high-strength concrete

Method used

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  • Preparation method of polycarboxylic acid admixture for machine-made sand high-strength concrete
  • Preparation method of polycarboxylic acid admixture for machine-made sand high-strength concrete
  • Preparation method of polycarboxylic acid admixture for machine-made sand high-strength concrete

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039](1) Preparation of PC-1: inject deionized water with a temperature of 25-35 ° C in the chemical kettle, add isopentenyl polyoxyethylene ether macromonomer, start the mixer to stir and dissolve; After the isopentenyl polyoxyethylene ether macromonomer is completely dissolved, the polyethylene glycol monomethyl ether esterified macromonomer is pumped into the reaction kettle to ensure that the temperature in the reaction kettle is controlled at 20-32 °C when starting to drip. During the synthesis of mother liquor, the temperature of the reaction kettle should be controlled at 50-58 °C; add hydrogen peroxide to the reaction kettle, firstly add solution A at a constant speed for two minutes, and then add solution B at a constant speed to ensure that solution A is added within 3 hours, and solution B is added dropwise at a constant speed. The solution was added in 2.5 hours. During the dropwise addition of solutions A and B, the temperature of the material was controlled at 40...

Embodiment 2

[0043] (1) Preparation of PC-1: inject deionized water with a temperature of 25-35 ° C in the chemical kettle, add isopentenyl polyoxyethylene ether macromonomer, start the mixer to stir and dissolve; After the isopentenyl polyoxyethylene ether macromonomer is completely dissolved, the polyethylene glycol monomethyl ether esterified macromonomer is pumped into the reaction kettle to ensure that the temperature in the reaction kettle is controlled at 20-32 °C when starting to drip. During the synthesis of mother liquor, the temperature of the reaction kettle should be controlled at 50-58 °C; add hydrogen peroxide to the reaction kettle, firstly add solution A at a constant speed for two minutes, and then add solution B at a constant speed to ensure that solution A is added within 3 hours, and solution B is added dropwise at a constant speed. The solution was added in 2.5 hours. During the dropwise addition of solutions A and B, the temperature of the material was controlled at 4...

Embodiment 3

[0047] (1) Preparation of PC-1: inject deionized water with a temperature of 25-35 ° C in the chemical kettle, add isopentenyl polyoxyethylene ether macromonomer, start the mixer to stir and dissolve; After the isopentenyl polyoxyethylene ether macromonomer is completely dissolved, the polyethylene glycol monomethyl ether esterified macromonomer is pumped into the reaction kettle to ensure that the temperature in the reaction kettle is controlled at 20-32 °C when starting to drip. During the synthesis of mother liquor, the temperature of the reaction kettle should be controlled at 50-58 °C; add hydrogen peroxide to the reaction kettle, firstly add solution A at a constant speed for two minutes, and then add solution B at a constant speed to ensure that solution A is added within 3 hours, and solution B is added dropwise at a constant speed. The solution was added in 2.5 hours. During the dropwise addition of solutions A and B, the temperature of the material was controlled at 4...

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Abstract

The invention discloses a preparation method of a polycarboxylic acid admixture for machine-made sand high-strength concrete, and the admixture comprises the following components in percentage by weight: 16.0-18.0% of polycarboxylic acid high-performance water-reducing mother liquor, 30.0-32.0% of six-carbon comprehensive mother liquor, 38.0-40.0% of polycarboxylic acid high-performance slump-retaining mother liquor, 4.0-6.0% of sodium gluconate, 4.0-10.0% of white sugar, 6-7 parts per ten thousand of 740 defoaming agent and the balance of water. The admixture is applied to super high-rise pumping machine-made sand ultrahigh-strength concrete, and the problems that the machine-made sand ultrahigh-strength concrete is prone to pump segregation, and the viscosity is too large, the fluidity is small, and the pumpability is poor due to the low water-binder ratio and the large mixing amount of a binder material can be effectively solved; the admixture can meet the adaptability problem of high-strength concrete raw materials, meanwhile, by using the admixture, the 4h slump loss of a mixture can be zero, and the requirement of pumping construction of super high-rise buildings can be met.

Description

technical field [0001] The invention relates to the field of building material concrete, and specifically provides a preparation method of a polycarboxylate admixture for machine-made sand high-strength concrete. Background technique [0002] Super high-rise pumping concrete mix design technology refers to modern concrete pumping technology with a pumping height exceeding 100m. With the expansion of urbanization, there are more and more super high-rise buildings, and the design technology of super high-rise pumped concrete mix ratio has become an indispensable key to the construction technology of super high-rise buildings. For concrete, pumping high-strength concrete has high pressure and high viscosity, and pumping construction is particularly difficult, resulting in a series of construction technical problems that need to be solved urgently. Therefore, the study of super high-rise pumping technology of high-strength concrete has particularly important practical significa...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F283/06C08F220/06C08F220/20C08F220/58
CPCC04B40/0046C08F283/065C08F220/06C08F220/20C08F220/585C04B24/26C04B24/2694C04B24/165C04B2103/22C04B2103/50
Inventor 叶鸿宏马正林李官勇樊兴波陈芝轩王伟罗顺江魏家旭胡俊李白雨史晓飞刘睿迪
Owner YUNNAN CONSTR INVESTMENT HLDG GRP CO LTD
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