Lime plaster

Painted Lime Plaster Mask and Skull of a Man - British Museum

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 kept moist and access of CO2 from the air is possible. It will not set when submersed in water. When a very thick layer or several layers are applied, the lime can remain soft for weeks.

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 gypsum.

Advantages

Lime plaster sets up to a solid mass that is durable yet relatively flexible. Hydraulic lime plaster is not as hard as cement plaster, non hydraulic limes and historic limes were graded as feeble, moderate and eminent, modern hydraulic limes would be graded in newtons, 2, 3.5 or 5, Portland cement plaster on the other hand would typically be in the region of 25 to 35 newtons When cured, i.e. up to 10 times harder. Lime plaster is less affected by water and will not soften or dissolve like drywall and earthen or gypsum plaster. Unlike gypsum or clay plaster, lime plaster is sufficiently durable and resistant to the elements to be used for exterior plastering.

Compared to cement plaster, plaster made from hydrated lime is less brittle and less prone to cracking, requiring no expansion joints. It will not detach from the wall when subjected to shear stress due to expansion inflicted by solar radiation and moisture. Unlike cement plaster, it will shield softer materials from shear stresses. This would otherwise possibly cause the deterioration of the underlying surface. It is usually not recommended to replace more than 20% of the lime content with cement when rendering the facade.

Lime plaster is permeable and allows for the diffusion and evaporation of moisture. The elevated pH of the lime in the plaster will act as a fungicide; mold will not grow in lime plaster.

Disadvantages

Non-hydraulic lime plaster sets slowly and is quite caustic while wet, with a pH of 12. Plasterers must take care to protect themselves or use mild acids as vinegar or lemon juice to neutralize chemical burn.[1] When the plaster is dry, the pH falls to about 8.6. Non-hydraulic lime plaster requires moisture to set and has to be prevented from drying for several days. The number of qualified tradesmen capable of plastering with lime is in decline due to widespread adoption of drywall and gypsum veneer plaster.

Historical use in the arts

One of the earliest examples of lime plaster dates back to the end of the eighth millennium BC. Three statues were discovered in a buried pit at 'Ain Ghazal in Jordan that were sculpted with lime plaster over armatures of reeds and twine. They were made in the pre-pottery neolithic period, around 7200 BC.[2] The fact that these sculptures have lasted so long is a testament to the durability of lime plaster.[3]

Historical uses in building

  • Lime plaster was found to have been a multi-purpose material at the archaeological site of 'Ain Ghazal in modern-day Jordan. The site dates human occupation from 7200 BC to 5000 BC. Lime plaster is believed to have coated internal walls of buildings and to have been used as the main component of some anthropomorphical figurines discovered at the site.
  • Qadad lime plaster is waterproof and used for interiors and exteriors
  • Some of the earliest known examples of lime used for building purposes are in ancient Egyptian buildings (primarily monuments). Some of these edifices are found in the chambers of the pyramids, and date to between the Ninth and Tenth Dynasties (~2000 BC). They are still hard and intact.
  • Archaeological digs carried out on the island of Malta have shown that in places like Tarxien and Hagar, lime stucco was also used as a binder to hold stone together as well as for decoration at sites dating back as far as 3000–2500 BC.
  • At el-Amarna, a large pavement on brick was discovered that dates back to 1400 BC. It was apparently the floor of part of the harem of King Amenhotep IV.[4]
  • Ancient Chinese used Suk-wui (the Chinese word for slaked lime) in the construction of The Great Wall of China.
  • Ancient Romans used hydraulic lime (added volcanic ash, an activated aluminium silicate) to ensure hardening of plaster and concrete in cold or wet conditions.
  • The Aztec Empire and other Mesoamerican civilizations used lime plaster to pave streets in their cities.[5] It was also used to coat the walls and floors of buildings.
  • This material was used in the San Luis Mission architecture.[6]

See also

References

  1. ↑ Hagsten, Ellen. General Guidelines for Working with Lime Mortar and Limewash, Traditional & Sustainable Building, March 2007
  2. ↑ "Lime plaster statues". britishmuseum.org. British Museum. Retrieved 21 November 2013.
  3. ↑ J.N. Tubb, Canaanites, London, The British Museum Press, 1998
  4. ↑ Cowper, Ad. Lime and Lime Mortars, first published for the Building Research Station by HM Stationery Office, London, 1927
  5. ↑ ISBN 978-0-500-28714-9
  6. ↑ organiksoft.com, OrganikSoft,. "Historic Features - Old Mission San Luis Rey". www.sanluisrey.org.

Further reading

  • Cedar Rose Guelberth and Dan Chiras, The Natural Plaster Book: earth, lime and gypsum plasters for natural homes'
  • J.N. Tubb, Canaanites, London, The British Museum Press, 1998
  • Stafford Holmes, Michael Wingate, Building With Lime: A Practical Introduction, Intermediate Technology Publications Ltd,

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