What is the term for mortar's ability to retain moisture when in contact with masonry units?

The term for mortar's ability to retain moisture when in contact with masonry units is commonly referred to as "water retention." This property is crucial because sufficient moisture is necessary for the curing process of mortar, which allows the chemical reactions to occur that strengthen the bond between the mortar and masonry units. Proper water retention ensures that the mortar remains workable and adheres properly to the masonry during construction.

Moisture capacity, hydration, and absorption, while related to moisture interactions in masonry, do not specifically denote the ability of mortar to hold moisture when in contact with masonry units. Moisture capacity typically refers to the maximum amount of moisture a material can hold, hydration deals with the chemical reaction involving water during curing, and absorption pertains to the process by which a material takes in moisture. Therefore, water retention precisely captures the concept of mortar maintaining moisture in close contact with masonry, facilitating proper setting and performance.