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Absorption rate =
Weight of water absorbed by masonry unit
(usually brick) in one minute.
Accelerator =
A substance which (when added to concrete,
mortar or grout), increases the rate of hydration,
(shortening the time of set), or increasing the rate
of hardening or strength.
Adhesion =
The ability of mortar to stick to masonry units.
Admixture =
Material added to mortar, concrete, or grout to
change the character of the mortar as a water
repellent, coloring agent, retarder, or accelerator.
Adobe brick =
Unit made of clay with asphaltic materials
sometimes added. Unit is sun-hardened.
Aggregate =
Material, such as sand or gravel, added to mortar.
Ashlar =
A square or rectangular cut stone.
Arris =
Sharp edge made where two surfaces or sides
meet.
Bat =
A broken brick. Often half brick.