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Cement

Cement:- A cement is a binder, a sub-

stance that sets and hardens independently,
and can bind other materials together. The
most important use of cement is the produc-

tion of mortar and concrete.

Net weight of cement bag is 50Kg

Cement Manufacturing

Cement is made by heating limestone (calcium carbonate) with small quanti-

ties of other materials (such as clay) to 1450 °C in a kiln, in a process known
as calcination, whereby a molecule of carbon dioxide is liberated from the calci-

um carbonate to form calcium oxide, or quicklime, which is then blended with
the other materials that have been included in the mix. The resulting hard sub-

stance, called 'clinker', is then ground with a small amount of gypsum into a

powder to make 'Ordinary Portland Cement', the most commonly used type of
cement (often referred to as OPC).

Types of Cements based on Indian Standards:

Ordinary Portland Cement

It is further classified into three types- 33 Grade, 43Grade, 53Grade. It is commonly referred as
OPC. 33Grade signifies that 28 days strength of the cement will not be less than 33N/mm2 and

similarly for other grades as well.

Participant Handbook : Masonry 29