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Preparation method of concrete ultra retarder special for underwater secant pile walls

A super retarder and concrete technology, applied in the field of construction, can solve the problems of unsatisfactory effects of ordinary retarders, short action time of ordinary retarders, and reduced concrete strength, so as to increase strength, delay hydration temperature peak, The effect of improving the retarding performance

Inactive Publication Date: 2019-06-14
浙江德清天和新型建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in the construction of mass concrete, the effect of using ordinary retarders is not ideal, and it is easy to produce temperature cracks and reduce the strength of concrete; in order to avoid "cold joints" in the construction process of high-rise buildings, the setting time of concrete is required to be extended to 24h. even longer
Ordinary retarders have a short action time and obviously cannot meet the above construction requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] The embodiment of the preparation method of a special concrete super retarder for underwater occlusal piles of the present invention will be further described.

[0028] A preparation method of a special concrete super-retarder for underwater occlusal piles, comprising the following steps:

[0029] S1: Prepare raw materials, including 10-15 parts of organic phosphate, 5-10 parts of organic retarder, 3-5 parts of sodium phosphate, 5-10 parts of sodium polyacrylate, 12-16 parts of ethoxy diglycol ether , 3-5 parts of ammonium bicarbonate, 3-8 parts of ammonium persulfate, 20-30 parts of water, and mix uniformly at room temperature to form raw materials;

[0030] Polyglutamic acid / chitooligosaccharide hydrogel 5-9 parts sucrose 8-12 parts starch compound 8-12 parts

[0031] S2: add water reducer, the weight ratio of raw material to water reducer is 20:1;

[0032] S3: adding an oxidizing agent to carry out an oxidation reaction;

[0033] S4: adding an initiator;

[0034]...

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PUM

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Abstract

The invention relates to a preparation method of a concrete ultra retarder special for underwater secant pile walls. By adopting a novel initiating manner, the initiated retarder can improve the retarding performance of concrete, improve the strength of the concrete, and lower the cost of the concrete. Abundant hydrophilic radicals such as hydroxyl and amidogen are contained in a macromolecular chain, so that water molecules in the concrete can be adsorbed, and are released slowly in the condensing process of the concrete, so that the effect of retarding underwater is achieved.

Description

technical field [0001] The invention belongs to the field of construction, and in particular relates to a preparation method of a special concrete super retarder for underwater occlusal piles. Background technique [0002] Concrete admixture is a commonly used reagent in the concrete preparation process. It not only has a small dosage, but also can improve the performance of concrete and meet the needs of reagents. At the same time, it can also save cement, reduce energy consumption and reduce pollutant emissions. Common admixtures are: early strength agent, water reducing agent, air-entraining agent, retarder, etc. Retarders can delay the hydration rate of cement, adjust the setting time of concrete, and improve the construction performance of concrete. There are many types of retarders, and sucrose, citric acid, sodium gluconate, and inorganic phosphate are commonly used at present. In the production of ready-mixed concrete, it is often necessary to add a certain amount ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/24C04B103/22
Inventor 向明刘杰邓亚芬沈剑葛威金科益
Owner 浙江德清天和新型建材有限公司