To avoid hardening due to hydration, masonry material should be used before how long?

Masonry materials, such as concrete or mortar, undergo a process called hydration during which water reacts chemically with the cement. This process is essential for the material to achieve its strength and durability. However, if masonry materials are allowed to sit for too long after mixing without being used, they can start to harden, which can negatively affect workability and adherence to construction standards.

The correct timeframe to avoid hardening due to hydration is 2.5 hours (2 1/2 hours). This duration is based on the typical setting time for most masonry materials which, after this period, begin to lose their workability. Adhering to this timeframe helps ensure that workers can effectively shape and apply the materials without compromising the quality of the finished structure. It is crucial for contractors to understand these time limits to ensure proper application and to achieve the desired results in their masonry work.