Application of water-retaining shrinkage-reducing polycarboxylate water-reducer in preparation of high-performance concrete

A high-performance concrete and water-retaining technology, applied in the field of water-reducing agent in the preparation of high-performance concrete and water-retaining shrinkage-reducing polycarboxylate water-reducing agent, can solve the problems of low water-to-binder ratio, large increase in engineering cost, cracking, etc.

Active Publication Date: 2018-03-06
浙江红墙材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0038] Although the use of these shrinkage reducing agents reduces the shrinkage of concrete to a certain extent, the engineering cost increases greatly and the synthesis process is complicated.
[0039] Due to the large amount of cementitious materials used and the low water-to-binder ratio of HPC, the cracking problem is particularly prominent. It has always been a major technical difficulty that has plagued technology and researchers in the industry. At present, there is no effective way to overcome it at home and abroad. Shrinkage reducing agents and polycarboxylate shrinkage reducing agents have been studied both at home and abroad, but the results are not satisfactory.

Method used

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  • Application of water-retaining shrinkage-reducing polycarboxylate water-reducer in preparation of high-performance concrete
  • Application of water-retaining shrinkage-reducing polycarboxylate water-reducer in preparation of high-performance concrete
  • Application of water-retaining shrinkage-reducing polycarboxylate water-reducer in preparation of high-performance concrete

Examples

Experimental program
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Effect test

Embodiment 1

[0110] An embodiment of the preparation method of the water-retaining shrinkage-reducing polycarboxylate superplasticizer of the present invention comprises the following steps:

[0111] (1) In a closed autoclave, replace the air in the reactor with high-purity nitrogen repeatedly twice, inject 1mol of propylene alcohol and 0.2g of catalyst NaOH, raise the temperature of the reactor to 100-115°C, and start to slowly add 1mol of ring Oxygen, so that the reaction temperature is controlled within the range of 70°C, the pressure in the kettle is controlled at 0.2MPa, and the amount of ethylene oxide required for dropwise addition is controlled by the decrement method. After the dropwise addition of ethylene oxide is completed, the temperature Controlling at 80°C, the reaction was continued for 5h to obtain an intermediate product with the desired molecular weight.

[0112] (2) Keep the temperature at 80°C, start to slowly add 1mol of glycidol dropwise, and control the dropwise add...

Embodiment 2

[0115] An embodiment of the preparation method of the water-retaining shrinkage-reducing polycarboxylate superplasticizer of the present invention comprises the following steps:

[0116] (1) In a closed autoclave, replace the air in the reactor with high-purity nitrogen repeatedly for 3 times, inject 1mol of prenyl alcohol and 0.5gmol of catalyst KOH, raise the temperature of the reactor to 110°C, and start to slowly add 40mol of ring Oxygen, so that the reaction temperature is controlled within the range of 115°C, the pressure in the kettle is controlled at 0.4MPa, and the amount of ethylene oxide required for dropwise addition is controlled by the decrement method. After the dropwise addition of ethylene oxide is completed, the temperature Controlling at 110°C, the reaction was continued for 2h to obtain an intermediate product with the desired molecular weight.

[0117] (2) Lower the temperature to 80° C., start to slowly add 2 mol of glycidol dropwise, and control the drop...

Embodiment 3

[0120] An embodiment of the preparation method of the water-retaining shrinkage-reducing polycarboxylate superplasticizer of the present invention comprises the following steps:

[0121] (1) In a closed autoclave, replace the air in the reactor with high-purity nitrogen repeatedly twice, inject 1mol of isobutenol and 2g of catalyst potassium carbonate, raise the temperature of the reactor to 115°C, and slowly add 80mol of ethylene oxide dropwise Alkanes, so that the reaction temperature is controlled within the range of 130 °C, the pressure in the kettle is controlled at 0.6MPa, and the amount of ethylene oxide required for dropwise addition is controlled by the decrement method. After the dropwise addition of ethylene oxide is completed, the temperature is controlled at At 120°C, the reaction was continued for 0.5h to obtain an intermediate product with the desired molecular weight.

[0122] (2) Lower the temperature to 80° C., start to slowly add 3 mol of glycidol dropwise, ...

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Abstract

The invention provides an application of a water-retaining reduced polycarboxylic acid water reducer to preparation of high-performance concrete, and further provides the high-performance concrete containing the water-retaining reduced polycarboxylic acid water reducer. As polyhydroxy is introduced into molecular middle chains of the water-retaining reduced polycarboxylic acid water reducer, hydrogen bonds are formed between hydroxy and among the hydroxy and water molecules, a mico-crosslinking structure is formed, the viscosity of solution in cement paste capillary pores in the concrete is increased, the evaporation rate of the water molecules is delayed, and water-retaining property is remarkably improved, so that shrinkage of the high-performance concrete is reduced. High-performance concrete shrinkage test results indicate that the water-retaining reduced polycarboxylic acid water reducer has a good shrinkage effect, is high in cost performance has no influence on the workability and the strength of the high-performance concrete when being used for the high-performance concrete.

Description

technical field [0001] The invention relates to the use of a water-reducing agent in the preparation of high-performance concrete, in particular to the use of a water-retaining shrinkage-reducing polycarboxylate water-reducer in the preparation of high-performance concrete. Background technique [0002] High performance concrete (HPC) is concrete with durability as the basic requirement. The development of high performance concrete is conducive to improving the use function of buildings, prolonging the service life of buildings, thereby protecting the ecological environment and promoting economic and social development. sustainable development. High-performance concrete is a new type of high-performance concrete, which refers to the concrete with high workability, high strength and high durability, which is prepared by adding admixtures and admixtures using conventional materials and production processes. , has developed rapidly since its inception. However, during the app...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/06C08F222/02C08F228/02C04B28/00C04B24/32C04B24/16C04B103/30
CPCC04B24/166C04B24/32C04B28/00C04B2103/302C08F283/065C04B14/06C04B14/02C08F220/06C08F222/06C08F222/02C08F228/02
Inventor 张小富赵利华白淑英
Owner 浙江红墙材料科技有限公司
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