==>>LIME ==>>

PURE LIMESTONE=>
Is called calcite and that containing magnesite is called dolomitic limestone.
The mineral containing calcium carbonate and magnesium carbonate in equimolecular quantities
is called dolomite.

STONE LIMESTONE=>
Is almost pure lime obtained by calcination of limestone and is used for making
lime-sand mortar for superstructures; lime-surkhi mortar for substructures and: lime terracing
and flooring. Stone lime has hydraulic properties.

KANKAR LIMESTONE=>
Is an impure lime obtained by calcination of kankars dug out from underground
sources. These occur in the form of nodules and compact blocks. It is suitable for making limesand
mortars for substructures. It is commonly used for making hydraulic lime.

SHELL LIMESTONE=>
Is very pure lime obtained by calcination of shells of sea animals and corals. It is used for lime punning,
white wash and colour wash, soil stabilization and glass production.

MAGNESIAN LIME=>
Is manufactured from dolomite and contain magnesia more than 5 per cent. It
is used for making mortar and plaster.


PURE LIME=> [Cao]
Pure lime, generally called quick lime, is a white oxide of calcium. Much of
commercial quick lime, however, contains more or less magnesium oxide, which gives the
product a brownish or grayish tinge. Quick lime is the lime obtained after the calcination of
limestone. It is also called caustic lime. It is capable of slaking with water and has no affinity for
carbonic acid. The specific gravity of pure lime is about 3.40.

FAT LIME=>
Fat lime has high calcium oxide component and, sets and hardens by the absorption of CO2
from atmosphere. These are manufactured by burning marble, white chalk, calcareous tufa,
pure lime stone, sea shell and coral.

HYDRAULIC LIME=>
Contains small quantities of silica, alumina, iron oxide in chemical combination
with calcium oxide component. These are produced from carboniferous limestones and
magnesian limestone. It has the property to set and harden under water.

HYDRATE LIME=>
When quick lime is finely crushed, slaked with a minimum amount of water,
and screened or ground to form a fine homogeneous powder the product is called hydrated
lime.

LUMP LIME=>
Lume lime is the quick-lime coming out of the kilns.

MILK LIME=>
Milk lime is a thin pourable solution of slaked lime in water.

CHARACTERSTICS OF LIME==>>

1. Lime possesses good plasticity and is easy to work with.
2. It stiffens easily and is resistant to moisture.
3. The excellent cementitious properties make it most suitable for masonry work.
4. The shrinkage on drying is small because of its high water retentivity.

USES OF LIME==>>
In construction slaked lime is mainly used to make mortar for laying masonry and plastering. When so used quick lime should be completely hydrated by slaking from 3 to 14 days, depending upon the kind of lime, temperature, and slaking conditions. Hydrated lime, although immediately usable, is usually improved by soaking overnight or longer. Hydrated lime is often added to Portland cement mortar in proportions varying from 5 to 85 per cent of the weight of the cement to increase plasticity and workability. Most of the historical buildings had been plastered in lime. Lime punning—about 3 mm thick shell lime layer to improve the plastered surfaces and to give a shining appearance—is used very commonly now a days in the new structures. Some of the other uses of lime are manufacture of lime bricks, artificial stones, paints, glass; as stabilizer for soils and as a flux in metallurgical processes.