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Hydrated lime is not a necessary mortar ingredient. You can make mortar with just Portland cement, sand and water. The mortar that I used to permanently attach the brick and stone to my patios did not contain any hydrated lime. But adding hydrated lime to the mortar mix can be beneficial. The plasticity or workability of the mix will improve. When hydrated lime is added to the mix, the sand and the cement do not separate.
Basically, to mix the mortar, you will use a ratio of three parts masonry sand (builders sand, if it is very clean), to one part masonry cement. Add water to the dry materials and mix to a consistency like pudding. Too dry, and it will be difficult to set the brick in the mortar bed, too wet and the brick will sag.