Types of cement

a. OPC (Ordinary Portland Cement) :

• It is mostly used which is suitable for general purpose such as pavement, bridge, culverts, water tank.
• It has adequate resistance to dry, shrinkage and cracking but has less resistance to chemical attack.
• It reaches in design and strength in 26 days.

b. PPC (Portland Pozzolana cement):

• Pozzolana is natural or artificial materials containing silica and alumunia in a reactive form such as volcanic ash, fly ash, powder burnt brick etc.
• In this PPC, 25 % OPC is mixed with definite proportion of pozzolana materials.

Suitability of PPC:

• Economical to use
• Produce less heat
• It has low early strength and is not suitable for high grade concrete.

c. Rapid hardening cement (RHC ):

• It is known as high early strength cement.
• It is used where frame work is to be removed quickly or when early strength is necessary for further construction.
• It has high heat of hydration and achieves its design in 7 days or less.
• Due to high heat generation, it should not be used in mass concreting or large structural section.

d. White cement

• It is a variety of OPC. It is white in color and use for floor finished, plaster work, ornamental work.
• It is used as mortar for marble and tile.

e. Quick setting cement:

• It sets faster than OPC. Initial setting time is 5 minutes. Final setting time is 30 minutes.
• It is used for concreting underwater and in running water.