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lime plaster
Lime plaster is 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.
The most commonly-used type of lime for lime plaster—non-hydraulic hydrated lime—only sets through carbonatation of CO2 in the air, and will not set until dry. The water added to the mix is purely to improve workability and stickiness. This causes limitations in construction use as the lime can remain soft for weeks or months. The curing time of lime plaster can be shortened by using natural hydraulic lime or adding pozzolan additives, transforming it into artificially hydraulic lime. In ancient times, Roman lime plaster incorporated pozzolanic volcanic ash; in modern times, fly ash is preferred. Non-hydraulic lime plaster can also be made to set faster by adding small quantities of gypsum plaster.
== Advantages ==
Lime plaster sets up to an extremely hard and solid mass that is very durable; lime-plastered walls have lasted for thousands of years. Lime plaster is unaffected by water and will not soften or dissolve like gypsum plaster or drywall. Unlike gypsum plaster or drywall, lime plaster is sufficiently durable and resistant to the elements to be used for exterior plastering. Compared to cement plaster, lime plaster is less brittle and cracks much less, requiring no expansion joints as a result. The elevated pH of the lime in the plaster will also act as a fungicide; mold will not grow in lime plaster or on nearby wood.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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