mortar
Mortar is the binding material used in masonry construction to seal the connection between the modular components (i.e. brick, CMU). There are three main components in any type of mortar:
  1. Sand- The most common fine aggregate used in mortars is sand
  2. Cement- The component used to bind the aggregate
  3. Water- Potable water is used to hydrate the mixture
and additionally
The most common type of mortar is the basic Portland Cement Mortar, a mixture of sand, portland cement, and water. It features a high compressive strength, it hardens at a consistent rate, it is effective in resisting damage during freeze/thaw cycles, and has a low water retention.

Lime mortar is a mixture of sand, slaked lime, and water, and is a breathable mortar (that is, it allows moisture to pass through it). It is used commonly in old buildings, and should be used when repointing them, as using a Portland Cement Mortar may trap moisture inside the wall system when it was originally designed to breathe.

Pozzolana mortar is a mixture of pozzolanic ash, lime, and water. It is a dense mortar and according it can be set underwater and can be stronger than Portland Cement Mortars.

There are five basic mortar types:
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