What is 'quicklime' according to this standard?

A calcined material, primarily calcium oxide or calcium oxide with magnesium oxide, which is capable of slaking with water (Clause 3.1).

What is the definition of 'slaking'?

The process of chemically combining quicklime with water (Clause 4.3).

How does the code define 'fat lime'?

It is a type of white lime, also known as non-hydraulic lime, which sets slowly by reaction with atmospheric carbon dioxide. It is typically derived from high-purity limestone (Clause 3.4).

What is 'hydraulic lime'?

A lime containing silica or alumina which combines with it during burning, giving it the property of setting and hardening under water (Clause 3.5).

IS 6508

: 1988

Glossary of terms relating to building lime

CurrentSpecializedTerminologyMaterials Science · Building Limes and Gypsum Products

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This standard provides a glossary of terms related to building lime. It defines the terminology for different types of lime (quicklime, hydrated lime), related materials like limestone, manufacturing processes (calcination, slaking), and properties used in the construction industry, particularly in mortars and plasters.

Glossary of terms relating to building lime

Practical Notes

Crucial for interpreting specifications for heritage conservation and restoration projects where lime mortar is predominantly used.

Helps differentiate between hydraulic lime (sets with water) and non-hydraulic/fat lime (sets by air carbonation), which is critical for mortar design.

Should be used as a companion document to IS 712, which covers the specifications for building limes.