Which process can lead to cracking in concrete when not properly managed?

The correct answer, plastic shrinkage, refers to the cracking that can occur in newly poured concrete as it begins to set and cure. During the curing phase, the surface of the concrete may lose moisture rapidly due to factors like high temperatures and low humidity. If this moisture loss occurs quickly, it can lead to the formation of cracks because the outer layer of the concrete shrinks while the inner concrete is still in a plastic, unset state. This type of cracking is particularly concerning since it can compromise the aesthetic and structural integrity of the concrete if not managed.

Effective management practices include using curing compounds and moisture-retaining coverings, which help to maintain adequate moisture levels in the surface of the concrete during the critical early stages of setting. Additionally, ensuring a gradual cooling process and controlling environmental conditions can mitigate the risks of plastic shrinkage cracks.

Other processes, while potentially related to issues in concrete stability, either address different stages of hardening or do not directly cause cracking due to moisture loss, making them less relevant to the question at hand.