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Roman concrete is simply concrete made by pozzolan cement. You make pozzolan cement by grinding quicklime together with volcano ash, fly ash from coal power pla
by larryliu 4y ago
Roman concrete is simply concrete made by pozzolan cement. You make pozzolan cement by grinding quicklime together with volcano ash, fly ash from coal power plants, or metallurgical slags.
- grosswait 4y agoBut the author’s point still stands. That knowledge was lost and then rediscovered.