What is the main objective of fogging fresh concrete?

The main objective of fogging fresh concrete is to place a layer of water on the surface. This technique involves using water mist to help maintain adequate moisture levels on the concrete surface during the curing process. A proper moisture level is critical in preventing the surface from drying out too quickly, which could lead to the formation of cracks, known as plastic shrinkage cracks, particularly in hot and windy conditions.

By fogging, a thin layer of water is created, allowing for more controlled evaporation and helping to ensure that the hydration process continues effectively, which is essential for achieving desired strength and durability in the concrete. The technique is especially useful in hot climates or during summer months when high temperatures and low humidity levels can accelerate evaporation rates.