Concrete technology is developing rapidly, and the concrete system is used in the construction field. However, there are still some problems in the use of concrete. For example, harmful bubbles are prone to appear on the surface of concrete. The main cause of blistering is related to the material and construction method. The foam can be defoamed and suppressed by adding concrete defoamer. This article analyzes the cause of foaming on the concrete surface and provides solutions for defoaming.

(Picture: Application of defoamer in concrete industry)

Cause analysis of concrete blistering

1. Material causes foam in the concrete system

In order to improve the performance of the concrete system, it is usually necessary to add some admixtures to the concrete. Many admixtures contain surfactants, which can easily lead to foam. In addition, the appearance of foam in the concrete system is also related to many factors such as water salinity, cement gasification and cement injection equipment. For example, cement mortar contains lignosulfonate admixtures, and high plasma concentrations of Ca2+, Mg2+ and Cl- in the water can easily induce bubbles in the cement mortar.

2. Improper construction technology is also the cause of bubbles in the concrete system

Improper concrete construction techniques can easily lead to bubbles, such as vibrating techniques and improper use of mold release agents.

Improper application of the release agent can easily cause pitted surfaces in the concrete structure. Some construction units use mineral oil-based mold release agents, such as waste engine oil recovered from machinery factories. This type of oil-based mold release agent has great adsorption of air bubbles, and concrete bubbles will be adsorbed on the formwork once they come in contact with it. And it is formed on the surface of concrete structure; water emulsion type release agent is currently on the market, but some products have higher air-entraining properties, which will also cause honeycomb pockmark on the surface of concrete structure.

(Picture: The hazards of concrete foaming)

Foaming on concrete surface for defoaming plan

After on-site analysis, the materials and construction techniques of the concrete system are likely to cause a large amount of foaming in the system. The harmful foaming in the concrete system needs to be treated in time to prevent harmful foaming from affecting the strength and appearance of the concrete.

There are two main forms of bubbles in concrete: one is when the buoyancy of the bubbles is greater than the retarding force of the cement mortar on gas phase escape, the bubbles gather on the liquid surface to form continuous visible foam; the other is when When the viscous force and structural force of the concrete paste produce sufficient resistance to gas phase escape, the air bubbles are discontinuously dispersed in the cement mortar, which will cause the density of concrete components to decrease during construction and affect the density of concrete components.

The foaming of concrete system can be prevented and controlled by adding defoamer. Defoamer is a kind of chemical additives, which is mainly divided into food grade and industrial grade defoamers. The addition amount of industrial defoamer is very small. It can be used with the right formula. Quickly eliminate foam, industrial defoamers are widely used in chemical, water-based coatings, circuit boards, building materials, inks, water treatment and other industries.

The defoamer has a certain pertinence, and the right formula can have a multiplier effect.

(Picture: Nanhui concrete defoamer sample)

The Nanhui defoamer manufacturer has specifically developed and designed concrete defoamer for the foaming characteristics of concrete systems, which is a compound defoamer with strong defoaming pertinence and obvious defoaming effect. The defoamer added to the concrete foaming system can be well dispersed and spread, and can easily eliminate the foam of the concrete system, whether it is the foam caused by the concrete formula material or the foam caused by the construction process, it can easily eliminate the foam .

Nanhui is a manufacturer with years of application experience. It has far more defoaming technology than other antifoaming agents in the market. From the above cases, we prove the strength of our Nanhui defoamer. We have a group of excellent defoaming engineers, and an independent laboratory that facilitates defoaming experiments with foams that are difficult for customers to solve. If you want to know more about defoamer products, you can call our hotline: +86 13428601010.

This article is from the manufacturer of Nanhui defoamer (http://www.nhdefoamer.com/), please indicate the source if you need to reprint.