What is referred to as segregation in concrete?

Segregation in concrete refers specifically to the phenomenon where different components of the concrete mix separate from one another. This is most commonly observed as the separation of coarse aggregates from the finer cement paste and water. When segregation occurs, it can lead to an uneven distribution of materials, adversely affecting the strength, durability, and overall quality of the concrete. This issue can arise due to excessive vibration, improper handling or placement techniques, or using mixes with an inappropriate water-to-cement ratio.

The other options do not accurately describe segregation. The curing process of concrete is focused on maintaining moisture to allow proper hydration, while mixing different concrete types relates to creating a blend of specific mixes rather than separation. Freezing of wet concrete pertains to a physical state change rather than the separation of components in the mix.