Shrinkage-reducing type concrete high-efficiency water reducing agent

A high-efficiency water reducer and concrete technology, which is applied in the field of concrete admixtures, can solve the problems of exacerbating the risk of concrete cracking, the difficulty of expanding the expansion agent, and the uncertainty of the expansion agent, achieving good shrinkage resistance, reducing shrinkage, and good adaptability sexual effect

Inactive Publication Date: 2020-08-18
浙江五龙新材股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Generally, the solution to this problem is to add an expansive agent to the concrete to generate expansive hydration products to compensate for the shrinkage of the concrete and reduce cracking. Self-expansion can easily lead to concrete cracking, so the use of expansion agent has obvious limitations and uncertainties
The principle of expansion agent is to react with sufficient water to form ex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1

[0027] This embodiment is composed of the following components by weight percentage: 87.3% of naphthalene-based superplasticizer, 8.2% of polyethylene glycol, 2.5% of neopentyl glycol, and 2.0% of xanthan gum.

[0028] After weighing each component by weight, firstly add 87.3% of naphthalene-based superplasticizer into the reaction kettle, heat it to 50-60°C, and then add the shrinkage-reducing component polyethylene glycol 8.2 in turn every 10-15 minutes % and neopentyl glycol 2.5% are stirred until completely dissolved, maintain the temperature of the reactor at 50-60°C, continue to stir for 30 minutes and then cool down to 30-40°C, add the thickening component xanthan gum 2.0%, and continue stirring for 30 minutes until Cool to room temperature and the product is complete.

Example Embodiment

[0029] Example 2

[0030] The method is basically the same as that of Example 1, except that the raw materials are different. This example is composed of the following components according to weight percentage: 88.1% of naphthalene-based superplasticizer, 9.7% of polyethylene glycol, carboxymethyl cellulose 2.2%.

Example Embodiment

[0031] Example 3

[0032] The method is basically the same as that of Example 1, except that the raw materials are different. This example is composed of the following components according to weight percentage: 95.0% of naphthalene-based superplasticizer, 3.5% of neopentyl glycol, 1.5% of xanthan gum %.

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PUM

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Abstract

The invention relates to a shrinkage-reducing type concrete high-efficiency water reducing agent capable of effectively reducing the shrinkage rate of concrete. The agent has the advantages of simpleprocess, convenience in production and reliable performance. With the shrinkage-reducing type concrete high-efficiency water reducing agent of the invention adopted, the shrinkage of the concrete canbe effectively reduced, the defect of the high shrinkage rate of a naphthalene-based superplasticizer is well overcome, the application range of the naphthalene-based superplasticizer is widened. Theshrinkage-reducing type concrete high-efficiency water reducing agent has great social and economic benefits.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, in particular to a shrinkage-reducing high-efficiency water reducer for concrete. Background technique [0002] Naphthalene-based high-efficiency water-reducing agent has become the water-reducing agent with the largest production and usage in my country due to its advantages such as high water-reducing rate, good cement adaptability, low air content, low price, and little influence on setting time. It accounts for more than 55% of the water reducing agent used in my country, and it also has the advantage of being able to be used in combination with various other admixtures, making it the most widely applicable water reducing agent in China. These advantages make naphthalene-based high-efficiency water reducers often used in high-performance concrete and high-strength concrete, and high-performance concrete and high-strength concrete have a large amount of cementitious materials and low water-bi...

Claims

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Application Information

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IPC IPC(8): C04B24/38C04B103/30
CPCC04B40/0039C04B2103/302C04B24/026C04B24/26C04B24/38C04B24/383
Inventor 王政伟沈强金建国
Owner 浙江五龙新材股份有限公司
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