There are mainly two varieties of limes-namely, fat lime and hydraulic lime Table 5.-2 shows the comparison of similar items for these two types of lime.
Comparison between lime and hydraulic lime
|No.||Item||Feebly hydraulic lime||Moderately hydraulic lime|
|1||Composition||It is obtained from comparatively pure carbonate of lime containing only 5 per cent of clayey impurities.||It is obtained from limestones containing day to the extent of about 5 to 30 per cent and some amount of ferrous oxide|
|2||Slaking action||It slakes vigorously. Its volume is increased to about 2 to 2/12 times the volume of quick lime. The slaking is accompanied by sound and heat.||It slakes slowly, Its volume is slightly increased. The slaking is not accompanied by sound or heat.|
|3||It slakes slowly, Its volume is slightly increased. The slaking is not accompanied by sound or heat.||It sets slowly in presence of air It absorbs carbon dioxide from atmosphere and forms calcium carbonate||It sets under water. It combines with water and forms crystals of hydrated tricalcium aluminate and dicalcium silicate.|
|4||Hydraulicity||it does not possess hydraulic||it possesses hydraulic property.|
|5||Colour||It is perfectly white in colour.||Its colour is not so white as tat lime.|
|6||strength||It is not very strong. Hence it cannot be used where strength is required.||It is strong and can therefore be adopted where strength is required.|
|7||Uses||It is used for plastering, white-washing, etc. and for preparing mortar with sand or surkhi||It is used for preparing mortar for thick walls, damp places,etc. Estrange care is required to prepare mortar of this lime for plaster work.|
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