What are the similarities between modern cement and ancient cement

Asked by lebrahim53 | 11th Feb, 2020, 03:27: PM

Expert Answer:

Portland cement/ Modern cement is the most commonly used cement for construction work.
It is made of raw material which consists of 60% lime (calcium oxide), 25% silica (silicon dioxide) and 5% alumina.
 The rest is iron oxide and gypsum (calcium sulphate).
 
 Ancient cement is made by mixing volcanic ash in moist lime. It is a durable cement.
 
Modern cement and ancient cement both are used for construction work.

Answered by Varsha | 12th Feb, 2020, 12:12: PM