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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.
(At some point, this turns the mortar into concrete.) Here is a quote that I find on one site: Mortar is a cement/sand/water (and usually lime) mixture designed for laying up masonry units like cement block, stone or brick. Mortar is sticky so it adheres to the block, stone or brick.Concrete is designed to stand alone.. While I am sure I have not covered all of the factors here, this should give you an idea.oncrete, mortar and grouts are all mixtures of Portland cement, water, and aggregates (sand, and in the case of concrete: gravel.). Concrete is used for structural purposes, and it's primary role is to support a load.