The ratio of cement, lime, sand, and water depends on the application:
Cement Mortar:
Common mix ratio: 1:3 to 1:6 (Cement: Sand)
Used for high-strength applications like structural masonry.
Lime Mortar:
Common mix ratio: 1:2 to 1:3 (Lime: Sand)
Used for historic restoration and structures requiring flexibility.
Cement-Lime Mortar:
Common mix ratio: 1:1:6 (Cement: Lime: Sand)
Provides a balance of workability, strength, and elasticity.