What is the recommended maximum time for keeping unused mortar before disposal?

The recommended maximum time for keeping unused mortar before disposal is 2 1/2 hours. This timeframe is crucial because mortar begins to lose its workability soon after mixing with water. As time passes, the chemical reaction in the mortar continues to set, making it less effective for its intended use. After 2 1/2 hours, the mortar may become too stiff and unworkable to properly adhere materials, which could compromise the quality and strength of the construction work.

Choosing this timeframe helps builders avoid using mortar that has deteriorated in quality, ensuring that they maintain construction standards and safety. By adhering to these guidelines, builders can optimize their workflow and avoid waste.