There are many times of cement but the below are commonly used:
1. OPC (ORDINARY PORTLAND CEMENT).
This is one of the commonly used cement. This is the basic cement for all construction activities. By adding some additives with this cement, we can produce some other cement types.
PPC (PORTLAND POZZOLLONA CEMENT OR POZZOLLANA CEMENT)
This is the only cement that can be used in areas where cement is exposed to water or in under water areas ie., bridges across rivers, seas and dams etc.,
Other types of cements tends to crack if used at these places.
This cement remains harder even under water, but has a lower strength compared to other grades of OPC cements like 43 grade and 53 grade cements . A defined quantity of flyash / ash (15 - 35%) added to OPC cement is called pozzollana cement.
That is, OPC cement becames PPC cement after mixed with flyash/ash.
(Image of flyash in hand)
SLAG CEMENT :
A defined quantity of blast furnace slag (30 - 70%) added to OPC cement is called slag cement. Slag is a by product from iron industry.
(Image of blast furnace slag)