UNIT 2
CEMENT
, Introduction
Cement is a building material for
binding bricks, stones or aggregates.
A building material made by grinding
limestone and clay to a fine powder,
which can be mixed with water and
poured to set as a solid mass or used as
an ingredient in making mortar or
concrete.
Used for making mortar or concrete.
Cements natural and artificial.
Natural cement-burning and crushing
of stones and lime.
Artificial cement-burning at high
temperature and gypsum is added.
,Cement production
Ingredients of cement
Calcium (lime)
Silicon (Sand)
Alumina (clay)
Iron
Sulphate (optional)
, Lime- excess will decrease the strength. Deficiency will make it set
quickly.
Silica- higher silica increases the strength but setting time is
prolonged.
Alumina- results in quick setting. Excess alumina weakens cement.
Iron oxide- for hardness and strength.
Magnesia- hardness and colour.
CEMENT
, Introduction
Cement is a building material for
binding bricks, stones or aggregates.
A building material made by grinding
limestone and clay to a fine powder,
which can be mixed with water and
poured to set as a solid mass or used as
an ingredient in making mortar or
concrete.
Used for making mortar or concrete.
Cements natural and artificial.
Natural cement-burning and crushing
of stones and lime.
Artificial cement-burning at high
temperature and gypsum is added.
,Cement production
Ingredients of cement
Calcium (lime)
Silicon (Sand)
Alumina (clay)
Iron
Sulphate (optional)
, Lime- excess will decrease the strength. Deficiency will make it set
quickly.
Silica- higher silica increases the strength but setting time is
prolonged.
Alumina- results in quick setting. Excess alumina weakens cement.
Iron oxide- for hardness and strength.
Magnesia- hardness and colour.
