After adding water to grout, what is the maximum time allowed for placement before initial set occurs?

The correct answer is 1 1/2 hours, which aligns with typical industry standards regarding the placement of grout after water has been added. Once water is introduced to the grout mix, it starts a hydration process that will lead to the grout setting. This process is time-sensitive; if the grout is not placed within the specified time frame, it may begin to set and lose its workability, making it difficult or impossible to achieve a proper joint filling or to adjust during application.

The 1 1/2-hour time frame allows enough flexibility for the contractor to mix, transport, and apply the grout while ensuring that the characteristics needed for a successful installation are maintained. By adhering to this guideline, construction professionals can minimize the risk of compromised quality due to premature setting.

It’s essential for a supervisor to be aware of this timing to ensure project efficiency and quality control in the grouting process. Proper understanding of these timelines helps in planning and executing grout applications effectively, ensuring that the final product meets the desired strength and durability standards.