Current Location： Home > News > Chemical Knowledge > The principle of concrete carbonation and its influencing factors.

[Chemical Knowledge]：The principle of concrete carbonation and its influencing factors.

Read： 283 Time：20months ago Source：Transform the World with Simplicity

Concrete is a commonly used building material, but with the increase of service life, the surface of concrete is prone to carbonation. Carbonation refers to the continuous expansion of the carbonated layer on the surface of concrete and its gradual diffusion to the inside, resulting in the loss of durability and strength of concrete, which seriously affects its service life. The following is the basic principle of concrete carbonization and its influencing factors.
The principle of
concrete carbonation
the carbonation process of
concrete surface can be divided into two stages. Carbon dioxide and moisture absorbed from the air will react with the cement in the concrete structure to form calcium carbonate. The calcium carbonate then reacts with the calcium hydroxide in the concrete to form calcium and carbonate ions and release water.

, it should be noted that the carbonization process takes time, so the carbonization speed of concrete depends on many factors, including environmental conditions and the quality of the concrete itself.

the influencing factors of concrete carbonation

environmental factors

environmental factors are important factors affecting concrete carbonation. In general, concrete carbonation is mainly affected by the following environmental conditions: humidity, temperature, air pressure and carbon dioxide concentration. The influence of concrete quality on environmental factors will also indirectly affect the carbonation speed of concrete.
the quality of
concrete itself
the quality of
concrete itself is also an important factor affecting the carbonation rate. When the amount of cement in the concrete is low and the quality is low, the surface is more likely to be carbonized. Conversely, the better the quality of cement in concrete, the more difficult it is to carbonize.

service life

service life is another key factor of concrete carbonation. Generally speaking, the longer the service life, the greater the probability of carbonation on the concrete surface.

prevention measures

In order to prevent concrete carbonation damage to buildings, people have developed many prevention measures. The following are some common prevention measures.

use carbonation-resistant concrete

When the surface of concrete is carbonized, in addition to enhancing its thickness, carbonation-resistant concrete is also an effective solution. Other chemical components and reinforcing materials are added to the carbonation-resistant concrete to make it more resistant to carbonation.

underground concrete structures for drainage

For underground concrete structures, drainage is a very important factor. The underground structure faces a variety of complex environments such as high humidity, low temperature and poor air circulation. Timely drainage can effectively reduce the risk of concrete surface carbonization.

the use of anti-carbonation coatings

anti-carbonation coatings can effectively protect the concrete surface and avoid carbonation. This coating prevents carbon dioxide and water from entering the concrete surface, while also preventing corrosion and oxidation.

conclusion The carbonation of

concrete is a common failure phenomenon of building materials, which seriously affects the life and performance of concrete structures. In order to protect the concrete structure, appropriate preventive measures should be taken. The above prevention measures and factors can greatly slow down the process of concrete carbonation, increase the service life and safety of concrete structure.