Types of Cement

Apr 10, 2019
  • There are different types of cement manufactured to meet different physical and chemical requirements for specific construction projects by altering following ingredients while manufacturing:
  • It is the most common type of cement.
  • It is used for all ordinary purposes such as making concrete, mortar, etc.
  • OPC is available in three different grades namely grade 33, 43 and 53.

Composition of Ordinary Portland Cement

  • It is manufactured by mixing limestone/chalk with shale/clay to form clinker which is then finely crushed to form grey color cement.

Grades of Ordinary Portland Cement

  • It is available in three different grades in India as:
  • a. 33-grade (IS: 269–1998),
  • b. 43-Grade (IS: 8112–2000)
  • c. 53-grade (IS: 12269–1999)

Properties of Ordinary Portland Cement

  • It has an adequate resistance to dry shrinkage and cracking, but less resistance to chemical attack.
  • It has a medium rate of strength development and heat generation.

Application of Ordinary Portland Cement

  • This cement is suitable for all type of concrete construction.
  • It is widely used for the construction of high-rise buildings, roads, dams, bridges, flyovers, etc.
  • It is also is used for making grouts and mortars.
  • It is the mixture of ordinary portland cement and fine granulated blast furnace slag.
  • It contains 25-65 percent (by weight) of blast furnace slag.

Composition of Portland Blast Furnace Slag Cement

  • It is manufactured by grinding clinker and specific amounts of blast furnace slag together.
  • A small percent of gypsum is also added for controlling its setting time.

Properties of Portland Blast Furnace Slag Cement

  • They possess better workability, cohesiveness, and plasticity.
  • These qualities are explained to be due to lesser specific gravity and greater specific surface area of slag cement.
  • They have better resistance to sulfates of alkali metals, alumina, and iron.

Application of Portland Blast Furnace Slag Cement

  • It is better suited for structures meant for water retaining such as retaining wall, rivers, ports, tunnels for improvement in impermeability.
  • Used in mass concreting works such as dams, foundations which require low heat of hydration.
  • It is a variation of Ordinary Portland Cement (OPC), which includes a mixture of pozzolanic materials, OPC and gypsum.

Composition of Portland Pozzolana Cement

  • It is manufactured by adding pozzolanic materials such as fly ash, shales, clays etc. with Ordinary Portland cement.

Properties of Portland Pozzolana Cement

  • The pozzolana cement has many properties similar to Ordinary Portland Cement. But it also offers some additional properties, which are given below:
  • a. It produces less heat. Due to this property, it can be used in mega projects.
  • b. It offers greater resistance to sulphates and corrosive actions of sea water.

Application of Portland Pozzolana Cement

  • Its properties make it more useful for construction near or along the coastand also in sulphate soil.
  • It can also be used in sewage works and for underwater construction.