Concrete is a building material made by mixing raw materials such as sand, gravel, and cement. During the hardening process, it releases a large amount of heat. Due to the poor thermal conductivity of concrete, this heat often accumulates inside the concrete, forming a large temperature difference, leading to problems such as cracks and deformation.
In addition, the shrinkage of concrete is also an important factor in cracking. These cracks not only affect the structural safety of concrete, but also affect its service life. It is crucial to take effective control measures to reduce the temperature difference in large volume concrete structures.
In order to effectively control the cracks in concrete, the method of adding magnesium anti cracking agent can be achieved. Magnesium based crack resistant agents contain magnesium oxide, which can react with water to form magnesium hydroxide. The volume of magnesium hydroxide is 118% larger than that of magnesium oxide, so it can fill the pores in concrete, improve its compactness and impermeability.
In addition, magnesium hydroxide can also form expansion products, which can to some extent compensate for the stress caused by temperature changes and drying shrinkage in concrete, thereby reducing the occurrence of cracks.
Therefore, adding magnesium as an anti cracking agent is one of the effective means to control concrete cracks. It can not only improve the structural safety of concrete, but also extend its service life.