Polycarboxylate superplasticizer meeting requirement for 620-m ultrahigh pumping of self-compacting concrete and preparation method of polycarboxylate superplasticizer

A self-compacting concrete and ultra-high pumping technology, applied in the field of building materials, can solve the problems of large loss of fluidity, easy segregation of concrete, high viscosity and other problems, achieve low cost, simple and easy-to-control production process, and solve pressure bleeding Effect

Inactive Publication Date: 2016-11-23
中建西部建设北方有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the technical problems of the existing ultra-high pumping self-compacting concrete, such as easy segregation of concrete, difficulty in pumping due to excessive viscosity, large loss of fluidity, and easy plugging of pipes, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Prepare 1000g of the special polycarboxylate water reducer:

[0029] Take 165g of isopentenol polyoxyethylene ether (molecular weight 2400), 8.5g of acrylic acid, 10.5g of methacrylic acid, 10.8g of methyl acrylate, 1.2g of ammonium persulfate, 0.2g of thioglycolic acid, and 3.5g of sodium methacrylate , ascorbic acid 0.3g, deionized water 800g for subsequent use.

[0030](1) In a 1000ml four-neck flask equipped with a stirrer and a thermometer, feed nitrogen gas, and add in turn the above-mentioned weighed prenol polyoxyethylene ether 165g, sodium methacrylate sulfonate 3.5g, and deionized water 270g, control the temperature at 10°C to 40°C and keep stirring. After mixing uniformly, 1.2 g of ammonium persulfate was added into the four-necked flask. Here, sodium methacryl sulfonate will be put into the reaction vessel at the beginning, because sodium methacryl sulfonate also contains double bonds. As a chain transfer agent, it is also a small polymerized monomer of th...

Embodiment 2

[0034] Prepare 1000g of the special polycarboxylate water reducer:

[0035] Take 180g of isopentenol polyoxyethylene ether (molecular weight 2400), 11g of methacrylic acid, 3g of maleic acid, 4g of ethyl acrylate, 1g of azobisisobutyronitrile, 0.3g of mercaptopropionic acid, and 0.5g of isopropanol g, ascorbic acid 0.2g, deionized water 800g for subsequent use.

[0036] (1) In a 1000ml four-neck flask equipped with a stirrer and a thermometer, feed nitrogen gas, add the above-mentioned weighed prenol polyoxyethylene ether 180g, maleic acid 3g, and 270g deionized water successively, Control the temperature at 10°C to 40°C and keep stirring. After mixing evenly, add 1 g of azobisisobutyronitrile into the four-neck flask. Here, maleic acid is put into the reaction vessel at the beginning because the polymerization activity of maleic acid is not high. In order to ensure the effect and improve its utilization rate, it is added into the reaction vessel at the beginning of feeding....

Embodiment 3

[0040] Prepare 1000g of the special polycarboxylate water reducer:

[0041] Take 160g of isobutenol polyoxyethylene ether, 10g of acrylic acid, 3g of maleic acid, 25g of n-propyl acrylate, 1.1g of potassium persulfate, 0.5g of isopropanol, 0.4g of ascorbic acid, and 800g of deionized water for later use.

[0042] (1) In a 1000ml four-neck flask equipped with a stirrer and a thermometer, feed nitrogen gas, add in turn the above-mentioned weighed isobutenol polyoxyethylene ether 160g, maleic acid 3g, and 270g deionized water, and control the temperature 10°C to 40°C with continuous stirring. After mixing uniformly, 1.1 g of potassium persulfate was added into the four-neck flask.

[0043] (2) A solution obtained by mixing 10 g of acrylic acid, 25 g of n-propyl acrylate and 120 g of deionized water was added dropwise to a four-necked flask, and the dropping time was controlled to be 2 hours. At the same time, a solution obtained by mixing 0.5 g of isopropanol, 0.4 g of ascorbic...

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PUM

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Abstract

The invention provides a special polycarboxylate superplasticizer meeting a requirement for 620-m ultrahigh pumping of self-compacting concrete and a preparation method of the special polycarboxylate superplasticizer. For preparation of every 1,000 g of the polycarboxylate superplasticizer, components of raw materials comprise 160-180 g of polyether macromonomers A, 7-19 g of unsaturated carboxylic acid and derivative monomers B of unsaturated carboxylic acid, 4-25 g of unsaturated carboxylate ester and derivatives C of unsaturated carboxylate ester, 0.8-1.3 g of an initiator, 0.3-3.7 g of a chain transfer agent, 0.2-0.4 g of ascorbic acid and 800 g of water. With application of molecular design theories and correlation theories of water solution free radical polymerization as well as introduction of ester groups, the prepared polycarboxylate superplasticizer is enabled to have better fluidity keeping capacity; the polycarboxylate superplasticizer prevents harmful substance emission in a production process, is free of any by-products causing pollution, further, the raw materials have extensive sources and are easy to obtain and low in cost, and a production technology is simple and easy to control. The polycarboxylate superplasticizer has higher water-reducing rate and good slump retaining and water retaining performance, thereby being capable of effectively solving problems of water seeping under pressure, pumping loss and concrete workability loss which are probably produced during ultrahigh pumping of the self-compacting concrete.

Description

technical field [0001] The invention belongs to the technical field of building materials, and specifically relates to a special polycarboxylate water reducer meeting the requirements of 620-meter ultra-high pumping self-compacting concrete and a preparation method thereof. Background technique [0002] As a product of the combination of industrialization and urbanization, skyscrapers originated in the United States and have now spread all over the world. Skyscrapers are generally considered to be the ultimate symbol of urban development and urban economic power, and they have significant positive significance in promoting intensive use of land, forming urban agglomeration effects, enhancing the image of urban landmarks, expanding the vertical and horizontal space of the city, and promoting the interaction of spatial landscapes. At the same time, since the beginning of the new century, the height of the tallest building in the world has been continuously refreshed, and the a...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F220/14C08F220/28C08F220/18C08F222/02C08F222/06C04B24/26C04B103/30
CPCC04B24/2694C08F283/065C04B2103/302C08F220/1803C08F220/1802C08F220/281
Inventor 罗作球傅凌肖宏军袁启涛陈全滨王宏炜赵子强张娟
Owner 中建西部建设北方有限公司
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