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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.
A big mistake in repairing old stone or brick work is to use portland cement mortar. It's readily available, strong and inexpensive, yes. But as Ian will tell you, it's too strong. It doesn't have the flexibility of the lime mortar that was widely used in stone and brick construction well into the 20th century.When it's used to re-point an old wall, it is the brick or stone that will suffer, not the mortar.A major unwanted result of using portland cement mortar, Ian says, is that hairline cracks open almost immediately between mortar and stone. These cracks allow moisture inside the wall, where it becomes trapped. big mistake in repairing old stone or brick work is to use portland cement mortar. It's readily available, strong and inexpensive, yes. But as Ian will tell you, it's too strong. It doesn't have the flexibility of the lime mortar that was widely used in stone and brick construction well into the 20th century.