The phenomenon that occurs during the production process when the retarder is over-dosed.

When excessive use of a retarder occurs, the following phenomena may occur during the production process:

Slower setting speed of cement slurry: Excessive use of a retarder inhibits the hydration reaction of cement, resulting in a slower setting speed of the cement slurry. 

This may prolong the setting time of concrete and affect construction progress.

Decreased concrete strength: Excessive use of a retarder reduces the strength of concrete. 

This is because the retarder reduces the bonding force between cement particles, resulting in a decrease in concrete strength.

Increased concrete shrinkage: Excessive use of a retarder also increases the shrinkage of concrete. 

This is because the retarder reduces the amount of water released during cement hydration, resulting in increased concrete shrinkage.

Increased number of air bubbles in concrete: Excessive use of a retarder leads to an increased number of air bubbles in concrete. 

This is because the retarder reduces the surface tension of the cement slurry, making it easier for air bubbles to form and accumulate.

Decreased impermeability of concrete: Excessive use of a retarder reduces the impermeability of concrete. 

This is because the retarder reduces the viscosity of the cement slurry, making it easier for the slurry to penetrate.

In summary, excessive use of a retarder can result in slower setting speed of cement slurry, decreased concrete strength, increased concrete shrinkage, 

increased number of air bubbles in concrete, and decreased impermeability of concrete. 

Therefore, it is necessary to control the dosage ofthe retarder reasonably and avoid excessive use during the production process.