Describe and Differentiate Portland Cement and Pozzolonic Cement?
The common variety of cement is known as normal setting or ordinary cement.It was called Portland cement because it had resemblance in its colour after setting, to a variety of sandstone which was found in abundance in Portland of England.Pozzuolana is a volcanic powder which can also be processed from shales and certain clays.The % of this in cement is 10 to 30.This cement is used in marine structures ,sewage works and foundation under water.
