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Question
What are the differences between Modern cement and ancient cement?
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Solution
| Ancient cement | Modern cement |
| It was developed by the Romans during the Roman empire. |
It was developed by a British scientist, John Smeaton. |
| It was prepared by mixing volcanic ash in moistened lime. | It is made up of materials like lime \[\ce{(CaO)}\], clay, and silica, along with some other oxides of aluminium, iron, magnesium, and gypsum \[\ce{(CaSO4, 2H2O)}\]. |
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