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Concrete air-entraining agent for building

An air-entraining agent and concrete technology, which is applied in the field of building materials, can solve problems such as strength reduction, negative impact on concrete strength, and large air bubble size, so as to improve workability, improve freeze-thaw cycle resistance, improve workability and The effect of water retention

Inactive Publication Date: 2003-11-12
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Concrete mixture is a strong alkaline colloidal multi-component substance. Adding substances such as washing powder and soap during the mixing process can introduce a considerable number of air bubbles. However, due to the large size of the air bubbles, it has a negative effect on the strength of the concrete. The impact is very serious, that is, the strength will be greatly reduced, so these substances cannot be used as concrete air-entraining agents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1, concrete air-entraining agent for construction is formulated by 12 alkyl sodium sulfate 78% (percentage by weight, the same below), stearic acid 10%, sulfonated melamine 12%, and reference concrete (without adding the air-entraining agent) Compared with the air-entraining agent (concrete with the same mix ratio), adding the air-entraining agent accounting for 0.1 / 10,000 of the cement mass can make the air content of the concrete reach 3.4%, the water reduction rate reaches 5.2%, and the bleeding rate decreases by 47%, while 3d , 7d and 28d compressive strength ratios are above 100%.

Embodiment 2

[0020] Embodiment 2, the concrete air-entraining agent formula for construction is prepared by 76% of 12 alkyl sodium sulfate, 14% of stearic acid, and 10% of sulfonated melamine. The air-entraining agent can make the air content of concrete reach 5.5%-6.0%, the water reducing rate reaches 7.6%, the bleeding rate reduces by 64%, and the compressive strength ratios of 3d, 7d and 28d are all above 95%. After freeze-thaw cycles, the reduction rate of concrete compressive strength shall not exceed 10%, and the reduction rate of dynamic elastic modulus shall not exceed 8%.

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PUM

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Abstract

The present invention relates to a concrete air-outgoing agent formed from sodium lauryl sulfate, octadecanoic acid and sulfonated melamine. The application of said invention can greatly improve freezing-thawing resisting circulating property, salt freezing resistance and other various endurance indexes, and its negative affection on hardening body is smaller, and it has a certain effect for controlling concrete slump. Said invention is applicable to various structures (buildings) of reinforced concrete, light aggregate concrete, bridge, building, hydraulic structure and road surface, and is extensively used in building mortar (including plaster, masonry mortar and filling mortar).

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a concrete air-entraining agent for building. Background technique [0002] The freeze-thaw damage and salt freeze damage of concrete buildings and various structures, roads and marine engineering have always been the focus of people's attention. It has been proved that adding an appropriate amount of air-entraining agent in the process of concrete preparation, introducing and retaining an appropriate amount of air bubbles with small size and reasonable structure in the concrete is the most important measure to greatly improve the freeze-thaw cycle resistance of concrete and increase the durability index. However, the addition of common types of air-entraining agents such as sodium alkylbenzene sulfonate, lignosulfonate, etc., has a great negative impact on the strength of concrete due to the unreasonable structure of the introduced air bubbles (generally, ...

Claims

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Application Information

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IPC IPC(8): C04B24/16
Inventor 孙振平蒋正武
Owner TONGJI UNIV