CBSE Class 8 Answered
What are the similarities between modern cement and ancient cement
Asked by lebrahim53 | 11 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 | 12 Feb, 2020, 12:12: PM
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