Lime plaster that were sculpted with lime plaster over armatures of reeds and twine. They were made in the pre-pottery neolithic period, around 7200 BC. The fact that these sculptures have lasted so long is a testament to the durability of lime plaster. Lime plaster Lime plaster is a type of plaster composed of sand, water, and lime, usually non-hydraulic hydrated lime (also known as slaked lime, high calcium lime or air lime). Ancient lime plaster often contained horse hair for reinforcement and pozzolan additives to reduce the working time. Traditional non-hydraulic hydrated lime only sets through carbonatation when the plaster is
Hydraulic lime Hydraulic lime Hydraulic lime (HL) is a general term for varieties of lime (calcium oxide), or slaked lime (calcium hydroxide), used to make lime mortar which set through hydration. These contrast with varieties of "air lime", the other common types of lime mortar, which set through carbonation (re-absorbing carbon dioxide (CO) from the air). Hydraulic lime provides a faster initial set and higher compressive strength than air lime and "eminently hydraulic lime" will set in more extreme conditions including under water. The terms "hydraulic lime" and "hydrated lime" are quite similar and may be confused but are not necessarily the