What Is The Effect Of Adding Magnesium Chloride To Concrete?

Adding magnesium chloride to concrete can have both positive and negative effects. On the one hand, it can accelerate the setting time of concrete and increase its early strength. This is because magnesium ions react with the cement hydrates, forming additional strength-giving compounds.

On the other hand, excessive amounts of magnesium chloride can lead to a decrease in concrete durability, as it may cause corrosion of steel reinforcement. Additionally, the increased early strength may be accompanied by reduced long-term strength and increased shrinkage.

Therefore, if magnesium chloride is used as an accelerator, it should be added in controlled amounts and in combination with other materials, such as fly ash or slag, to mitigate any negative effects. The specific dosage and application should also be determined based on the unique characteristics of the concrete mix and the intended use of the finished product.