What is one of the defining features of masonry cement?

Masonry cement is a specialized type of cement designed for use in masonry applications such as bricklaying and the construction of blockwork. One of its defining features is that it combines Portland cement with hydrated lime. This combination provides several benefits: the hydrated lime enhances workability, improves adhesion, and increases the flexibility of the mortar, making it more suitable for various masonry tasks. Additionally, the inclusion of lime helps to improve the sustainability and durability of the mortar by allowing for better moisture control and reduced shrinkage.

The other options do not accurately describe masonry cement. For instance, stating it contains only lime overlooks the fact that Portland cement is a crucial component. Similarly, while masonry cement can be used in various applications, limiting it to interior use or outdoor constructions is misleading, as it is suitable for both environments depending on the specific mix and application requirements.