This is generally determined by the volume (tonnage) of lime used. A good way to think of quicklime is that it is hydrated lime without the water. It's important to understand that when water is added to quicklime it chemically combines with it to form two products: calcium oxide (quicklime) and carbon dioxide. The weight ratio is that 100 tons of pure calcium carbonate would ideally produce 56 tons of calcium oxide (quicklime).

The CAS number for quicklime is 1305-78-8 and the number for hydrated lime is 1305-62-0. A CAS number refers to Chemical Abstracts Service Registry Number and identifies a chemical. For example, the same CAS number would be used for quicklime and calcium oxide, since they are the same compound. The CAS number, however, tells nothing about the concentration of the chemical. (The Chemical Abstracts Service is a division of the American Chemical Society.) See similar questions...

Hydrated lime (calcium hydroxide) has more neutralizing power than the more common dolomitic (calcium-magnesium carbonate) limestone. Dolomitic lime is usually sold in 40-50lb. Bags vs. the small bag of Hydrated lime. This means that for gardening purposes, you should apply about two-thirds the recommended amount of Hydrated lime. See similar questions...

There are a wide range of different lime mortars available, all with different characteristics, and suitable for different applications. Non-hydraulic limes (CL90) are commonly available as 'lime putty', in 25kg bags or by the tonne. Natural Hydraulic Limes (NHL) Mortars are commonly available in 25kg bags from a wide range of manufacturers. NHL's come in a range of classifications based on compressive strength in N/mm2 at 28 days: NHL 2, NHL 3.5 & NHL 5. See similar questions...

What are the standard tests used to determine the percent of available lime (CaO%) and how do they differ? (ASTM C25 and AWWA B202 standard tests) Why is sugar added when running the standard titration for the percent of available lime (CaO%)? (ASTM C25 and AWWA B202 standard tests) See similar questions...

Lime is calcium oxide applied in granular form. Lime helps improve lawn color and density, controls thatch, and increases root development. Lime balances the pH levels in the soil that have been affected by the fertilizer applications throughout the year. To read more about the importance of Lime, please read our Article entitled "Winter Care." See similar questions...

Spalled brick in an1860s lighthouse that was repointed with portland cement mortar about twenty years ago. The historic stone masonry units have deteriorated dramatically, while the portland cement mortar joints remain intact. It' s important to understand that historic buildings are very different than modern buildings in several key ways: First, historic brick--in particular--is softer than modern brick because modern brick is fired at a much higher temperature than was possible in the past. See similar questions...

The term limestone can refer to both dolomitic limestone or high calcium limestone. Most limestone deposits are dolomitic limestone, which is a mixture of calcium carbonate and magnesium carbonate in a general ratio of 40-60%. High calcium limestone is generally considered to be in excess of 90% calcium carbonate. Nature does create predominantly limestone deposits composed of predominantly calcium carbonate, however, these locations are considerably fewer than those of dolomitic limestone. See similar questions...

Either. Pelletized is easier to apply but powder is cheaper. Use powder if you intend to incorporate. There is no difference in speed of reaction. See similar questions...

A lime render is a coating of lime-based material that was traditionally applied over rough, unsightly brickwork or rubblestone masonry walls. Non-hydraulic lime stuccos and hydraulic lime stuccos are common lime-based renders. In addition to these traditional applications, lime renders can restore some measure of protection to masonry buildings that have been sandblasted. (Sandblasting a masonry building is incredibly damaging. See similar questions...

Yes. As we have already mentioned on this page, historic brick was fired at a lower temperature and is typically softer than modern brick. Construction techniques have changed, but it's still important that the mortar accomodate the historic brick. Due to the prevalence of portland cement mortars (notably the standard Type N), very few masons have worked with traditional lime mortars. See similar questions...

ASTM has Standard Methods for testing chemical (C25) and physical (C110) properties. These standards can be purchased directly from ASTM at www.astm.org. See similar questions...

Hydrated lime can be used to raise the pH of acidic soils. This is also referred to as soil "sweetening." Hydrated lime is available from garden centers and should be applied in the amounts and using the procedures recommended on the packaging. See similar questions...

P. Mold & R. Godbey. "Limewash - Compatible Coverings for Masonry & Stucco." 2005, International Building Lime Symposium Proceedings (ISBN 0-9767621-0-2). R. Bennett. "The Use of Limewash as a Decorative and Protective Coating." The Building Conservation Directory, 1997, pp. 136-137. British] Quarry Products Association (formerly the British Quarry and Slag Federation). "Lime in Building." 1974. See similar questions...

Before this century building techniques and materials were very different from those employed today. Traditional properties need to "breathe" to allow moisture inherent in a solid wall construction without a damp proof course to evaporate from the external stonework or render. Many old buildings are constructed from materials such as brick, cob and stone which are relatively porous and often of lower strength. Lime mortars were normally used for bedding and plastering. See similar questions...