High-foam-stability and low-sensitivity concrete air entraining agent and preparation method thereof

Abstract

The invention provides a high-foam-stability and low-sensitivity concrete air entraining agent and a preparation method thereof, and belongs to the technical field of concrete admixture preparation, the high-foam-stability and low-sensitivity concrete air entraining agent comprises the following raw material components in percentage by mass: 20-40% of a gemini surfactant, 2-4% of a viscosity modifier, 2-8% of a foam stabilizer, 1-3% of a synergist and 45-75% of water. According to the high-foam-stability and low-sensitivity concrete air entraining agent disclosed by the invention, the asymmetric gemini surfactant and multiple functional components have a synergistic effect, so the foaming and foam stabilizing capabilities are remarkably improved; compared with a conventional air entraining agent, the high-foam-stability and low-sensitivity concrete air entraining agent has the advantages of low mixing amount, high foam stability, high adaptability to hard water and the like, and can meet the use requirements in severe environments such as high cold and low air pressure.

Description

technical field [0001] The invention relates to the technical field of preparation of concrete admixtures, in particular to a concrete air-entraining agent with high foam stability and low sensitivity and a preparation method. Background technique [0002] With the in-depth advancement of the western development strategy, concrete engineering construction has gradually expanded to areas with extremely harsh environments. In the Qinghai-Tibet Plateau region, the altitude is generally between 3000m and 5000m, the annual average temperature is mostly lower than 5°C, and the number of positive and negative temperature days per year can reach more than 180 days. Concrete is facing serious threat of freeze-thaw damage. At present, there are many studies on the frost resistance of concrete, among which the most effective measure is the addition of air-entraining agents. [0003] Compared with plain areas, alpine regions have higher altitudes and lower air pressure. When the altitu...

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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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