A kind of high foam-stabilizing, low-sensitivity concrete air-entraining agent and preparation method thereof

Abstract

The invention provides a high foam-stabilizing, low-sensitivity concrete air-entraining agent and a preparation method, belonging to the technical field of concrete admixture preparation. ~40%, viscosity regulator 2~4%, foam stabilizer 2~8%, synergist 1~3%, water 45~75%; Gemini surfactant and various functional components act synergistically to significantly improve foaming and foam stabilization capabilities. Compared with conventional air-entraining agents, it has the advantages of low dosage, high foam stabilization, and high adaptability to hard water, which can meet the requirements of high and cold conditions. Requirements for use in harsh environments such as low pressure.

Description

technical field [0001] The invention relates to the technical field of concrete admixture preparation, in particular to a high foam-stabilizing, low-sensitivity concrete air-entraining agent and a preparation method. Background technique [0002] With the deepening of the western development strategy, the construction of concrete projects has gradually expanded to areas with extremely harsh environments. In the Qinghai-Tibet Plateau, the altitude is generally between 3000m and 5000m, the annual average temperature is mostly lower than 5°C, and the annual positive and negative temperature days can reach more than 180d. Concrete is facing a serious threat of freeze-thaw damage. At present, there are many studies on the frost resistance of concrete, and the most effective measure is to add air-entraining agent. [0003] Compared with the plain area, the alpine area has high altitude and low air pressure. When the altitude reaches 4200m, the atmospheric pressure drops to about ...

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Problems solved by technology

In addition, low temperature will also reduce the surface activity of the air-entraining agent, which will adversely affect the effect of the air-entraining agent

When traditional air-entraining agents (such as rosin, saponin, etc.) are used in high-cold regions, there are problems such as increased dosage, poor foam stability, increased bubble spacing coefficient after concrete hardening, and insufficient durability.

[0004] Chinese patent CN202010109821.4 discloses a concrete air-entraining agent with good foam stability, good air-entraining effect, good compoundability with other admixtures, and strong adaptability to concrete, but it is mainly used in normal pressure environments. Does not take into account the needs of entraining air and stabilizing foam in the environment of high cold and low pressure

Chinese patent CN201810659914.7 discloses a concrete air-entraining agent used in alpine and high-altitude areas and its preparation method. Water-soluble resin-modified polybutadiene resin and water-soluble ionic polymer-modified polybutadiene resin are introduced into the triterpene saponin solution. Acrylamide improves the strength of the bubble wall and the foam stabilizing performance, but it does not consider the hard water situation in the alpine region, and there is still the problem of poor air-entraining effect in actual engineering

[0005] In summary, at present, there are few researches on concrete air-entraining agents for high-cold and low-pressure environments, and it is urgent to carry out research on the preparation technology of high-foam stability and low-sensitivity concrete air-entraining agents that meet severe conditions such as high cold, low pressure, and hard water.

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