What are the basic requirements for masonry mortar?

The basic requirements for masonry mortar include:

1. Bond strength: Masonry mortar should have good bond strength to ensure that it adheres firmly to the masonry units and provides a strong, durable structure.
2. Compressive strength: Masonry mortar should have sufficient compressive strength to withstand the load that the masonry structure will be subjected to without failing or crumbling.
3. Workability: Masonry mortar should be easy to work with and spread smoothly, making it easier to place the masonry units accurately and efficiently.
4. Durability: Masonry mortar should be able to resist the effects of weathering, such as freeze-thaw cycles, and maintain its strength and integrity over time.
5. Water retention: Masonry mortar should retain water for a sufficient time to allow for proper curing, while also allowing the masonry structure to dry out over time.
6. Consistency: Masonry mortar should have a consistent composition and performance, to ensure that it meets the requirements of the project and performs as expected.

By meeting these basic requirements, masonry mortar can provide a strong and durable bond between the masonry units and help to create a long-lasting structure.