Question

what are the similarities and differences between -
modern cement and ancient cement

Answer 1

Hey mate take your answer

As it turns out, not only is Roman concretemore durable than what we can make today, but it actually gets stronger over time. ... Modern concrete is typically made with portland cement, a mixture of silica sand, limestone, clay, chalk and other ingredients melted together at blistering temperature..

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Answer 2

similarities
both are used in building
both have to mix with water as both are in solid state
difference
modern cement is more strong as have more materials added in it
modern cement is made by machines while ancient was made by hands