What is the condition called when a concrete slab has a sheen due to excess moisture?

The condition described, where a concrete slab has a sheen due to excess moisture, is commonly referred to as "floating." This phenomenon occurs when water collects on the surface of the concrete slab during or after finishing, resulting in a glossy appearance. This sheen indicates that there is too much moisture present on the surface, which can lead to issues such as improper curing and eventual weakening of the concrete.

Floating typically happens during the finishing process when the concrete hasn't set properly, and the finishing tools may inadvertently trap excess water on the surface. When this occurs, it can complicate the overall drainage and durability of the slab, necessitating careful monitoring of moisture levels during the placement and finishing of concrete.

The other terms like jointing, spalling, and wet curing refer to different aspects of concrete work, such as the treatment of joints to control cracking, surface damage due to expansion or freeze-thaw conditions, and a method of maintaining moisture in curing concrete, respectively. Understanding these terms helps in identifying and addressing various concrete issues, but they do not pertain to the specific condition of a sheen caused by excess moisture.