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Special concrete pumping agent for ultra-high buildings and preparation method thereof

A concrete and super high-rise technology, applied in the field of building materials, can solve problems such as concrete bleeding, concrete segregation, and pump blockage, and achieve the effects of avoiding water, reducing initial viscosity, and simple composition

Active Publication Date: 2014-10-15
CHINA STATE CONSTRUCTION ENGINEERING CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the pumping agents need to be obtained through the compounding method, that is, several commonly used water reducers, such as polycarboxylate water reducers and retarders, water retaining agents, air-entraining agents and other additives are mixed in a certain proportion. However, the composition of this type of concrete admixture is more complicated, and the preparation process is more troublesome, and it is only effective when pumping middle and low-rise concrete. For high-rise building concrete pumping, especially when super high-rise building concrete pumping is more than 100 meters, it needs The pumping pressure is very high, and the high pressure will cause the concrete to bleed, resulting in concrete segregation, severe collapse or blockage of the pump, making it difficult to pump the concrete

Method used

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  • Special concrete pumping agent for ultra-high buildings and preparation method thereof
  • Special concrete pumping agent for ultra-high buildings and preparation method thereof
  • Special concrete pumping agent for ultra-high buildings and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A special pumping agent for super high-rise building concrete, which is prepared from the following raw materials in solvent water, and the dosage of each raw material is as follows:

[0029]

[0030]

[0031] The preparation method of the above-mentioned special pumping agent for super high-rise building concrete comprises the following steps:

[0032] 1) With the above proportioning ratio, take each raw material for subsequent use;

[0033] 2) Carboxylic acid A, methyl acrylate and mercaptoethanol are dissolved in 80g water to form aqueous solution A, and ammonium persulfate is dissolved in 80g water to form aqueous solution B;

[0034] 3) Under the protection of nitrogen, in a 500ml four-neck flask equipped with a thermometer, a stirrer and a dropping funnel, add 100g of deionized water, polyether A and starch acrylate in sequence, heat and stir in a water bath, and control the temperature at about 40°C ; After the polyether A and starch acrylate are fully dis...

Embodiment 2

[0038] A special pumping agent for super high-rise building concrete, which is prepared from the following raw materials in solvent water, and the dosage of each raw material is as follows:

[0039]

[0040] The preparation method of the above-mentioned special pumping agent for super high-rise building concrete comprises the following steps:

[0041] 1) With the above proportioning ratio, take each raw material for subsequent use;

[0042] 2) Sodium carboxylate B, ethyl acrylate, and 2-hydroxypropanethiol were dissolved in 80g water to form aqueous solution A, and ammonium persulfate was dissolved in 80g water to form aqueous solution B;

[0043] 3) Under the protection of nitrogen, in a 500ml four-neck flask equipped with a thermometer, agitator and dropping funnel, add 100g of deionized water, polyether B and starch acrylate in sequence, heat and stir in a water bath, and control the temperature at about 40°C ; After the polyether B and starch acrylate are fully dissolv...

Embodiment 3

[0045] A special pumping agent for super high-rise building concrete, which is prepared from the following raw materials in solvent water, and the dosage of each raw material is as follows:

[0046]

[0047]

[0048] The preparation method of the above-mentioned special pumping agent for super high-rise building concrete comprises the following steps:

[0049] 1) With the above proportioning ratio, take each raw material for subsequent use;

[0050] 2) Calcium carboxylate C, isobutyl acrylate and mercaptoacetic acid were dissolved in 80g water to form aqueous solution A; the potassium persulfate was dissolved in 80g water to form aqueous solution B;

[0051] 3) Under the protection of nitrogen, in a 500ml four-necked flask equipped with a thermometer, a stirrer and a dropping funnel, add 100g of deionized water, polyether C and acrylamide monomer in sequence, heat and stir in a water bath, and control the temperature at 40°C About; After the polyether C and acrylamide mon...

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Abstract

The invention relates to a special concrete pumping agent for ultra-high buildings. The special concrete pumping agent is prepared from raw materials of polyether monomers containing double bonds, unsaturated carboxylic acid and derivative monomers thereof, unsaturated carboxylic acid ester and derivative monomers thereof, a bleeding-improved assistant, a chain transfer agent and an initiator, wherein water reducing agents are composed of polyether monomers containing double bonds, unsaturated carboxylic acid and derivative monomers thereof, unsaturated carboxylic acid ester and derivative monomers thereof and bleeding improved assistants; the adding amount of the initiators and the adding amount of the chain transfer agents are 0.2-0.5% and 0.05-0.2% of the total weight of water reducing agents respectively. The special concrete pumping agent does not need to be compounded with other additives, is simple in ingredients, has effects of water reducing and slump conserving on concrete, reduces initial viscosity of concrete, avoids the bleeding phenomenon in ultra-high concrete pumping, and is suitable for smooth pumping of concrete to ultra-high buildings over 100 meters.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a special pumping agent for super high-rise building concrete and a preparation method thereof. Background technique [0002] With the increase of construction projects, pumped concrete is widely used. Due to the high strength, high viscosity and easy segregation of construction concrete, it is prone to serious collapse during the pumping process. In order to reduce the collapse during the construction concrete pumping process, generally Admixtures are added to concrete to reduce water and slump, reduce slump damage, and reduce pumping difficulty. At present, most of the pumping agents need to be obtained through the compounding method, that is, several commonly used water reducers, such as polycarboxylate water reducers and retarders, water retaining agents, air-entraining agents and other additives are mixed in a certain proportion. However, the composition of this ...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F283/06
Inventor 高育欣张涛郑广军毕耀吴雄李兴傅承飞霍亮王少峰韩武军孙冲熊龙汪金文
Owner CHINA STATE CONSTRUCTION ENGINEERING CORPORATION
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