What condition can lead to failure in mortar adhesion?

Failure in mortar adhesion can occur due to a variety of factors that impact the physical properties and the bonding capabilities of the mortar. When considering the conditions mentioned, it's important to note that each can adversely affect adhesion.

Excessive moisture can lead to problems such as the weakening of the bond between the mortar and the masonry unit. When mortar is too wet, it can become too plastic, making it difficult for it to set properly and bond effectively to the surface. High moisture levels can also lead to efflorescence, which can further compromise the surface and its adherence.

Dry conditions, while seemingly less problematic, can also hinder proper adhesion. Mortar needs a certain degree of moisture to cure effectively. In excessively dry conditions, evaporation of water can happen too quickly, preventing proper hydration of the cement components and leading to inadequate curing and bonding.

Incorrect mixing plays a crucial role in achieving the desired consistency and properties of the mortar. If the mortar is not mixed according to manufacturer specifications (regarding water content or ingredient ratios), it can lead to an improper chemical reaction, resulting in weak bonds.

All of these factors can contribute significantly to compromised adhesion of mortar, making it essential to control environmental conditions and adhere to proper mixing practices for optimal results. Thus