Quicklime

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White or creamy-white powders produced by the calcination of limestone or chalk in a kiln at a temperature of at least 900°C. Kiln temperatures are often significantly higher.

When slaked, quicklime formed from pure limestone produces non-hydraulic lime that will not set underwater. Certain siliceous and argillaceous limestones when calcined at relatively low temperatures, c.1000°C, produce lime with weak hydraulic properties, containing silicates, aluminates and other trace elements.

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Description

Quicklime (Calcium oxide CaO) is hydrated or slaked to produce lime putty, lime-wash and hydrated lime. There is also renewed interest in the hot-mix mortar method where quicklime and sand or aggregate are mixed with water and either used immediately whilst hot or cooled and stored before use. Hot-mix method mortars set by reaction with atmospheric carbon dioxide in the presence of moisture. 

Unconverted limestone or chalk and small quantities of insoluble flint and/or quartz are also often present in quicklime. 

Usage/Purpose

Quicklime (Calcium oxide CaO) is hydrated or slaked to produce lime putty, lime-wash and hydrated lime. There is renewed interest in the hot-mix mortar method where quicklime and sand or aggregate are mixed with water and either used immediately whilst hot or cooled and stored before use. Hot-mix method mortars set by reaction with atmospheric carbon dioxide in the presence of moisture. The control of the drying and curing process by ‘tending’ and protecting is crucial to success and long-term performance. Do not use below a temperature of 5°C or above 25°C. Do not use if there is risk of frost.

Shelf Life

Up to 3 months in original un-opened bags kept in DRY storage. Protect from air and rain as quicklime reacts with water.

Colour

Mortar colour is determined by the sand or aggregate mixed with the lime.

Observations

Hot-mix method mortars set by reaction with atmospheric carbon dioxide in the presence of moisture. Do not use if there is risk of frost. Seek technical advice.

Application

The handling and use of quicklime is a potentially hazardous activity and great caution must be exercised and full PPE (personal protective equipment) worn. Operatives familiar with the mixing and use of quicklime and experience of the hot-mix method should be employed. Accurate volumetric site mixing is essential. The control of the drying and curing process by ‘tending’ and protecting is crucial to success and long-term performance. Do not use below a temperature of 5°C or above 25°C. Do not use if there is risk of frost. Seek technical advice.

Availability

Singleton Birch Microlime 90. Singleton Birch Fine Lime 2. Calbux 90