I have been reading about Roman concrete (300BC-300AD) and how it has greater strength than current concrete mixtures. So far, my research has shown that they did not use re-bar in their structures. But did the Romans use anything external (like fiber, wood, etc) to improve their concrete's tensile strength?

For reference this was the source I was reading:

The Mechanics of Imperial Roman Concrete and the Structural Design of Vaulted Monuments

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    So you looked over this, which discusses volcanic ash? – justCal Nov 26 '17 at 20:55
  • Are you just interested in the tensile strength of Roman concrete, or other aspects as well? – sempaiscuba Nov 26 '17 at 20:59
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    Typically the Romans used arches to span large gaps - putting everything into compression instead of tension. Just look at their aqueducts and bridges. – Pieter Geerkens Nov 27 '17 at 5:54
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    The only addition I'm 100% sure of were small terracotta jars added to the mix for the Pantheon's dome, used to reduce the overall weight. – Rob Crawford Nov 27 '17 at 18:10
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    The thesis listed in the question discusses a variety of different caementa (what we would call aggregate) or materials used in the concrete mixtures to variously increase or decrease the concretes density. Travertine and brick pieces in lower regions, to pumice used in roof or ceiling arch structures. Quite interesting. – justCal Nov 27 '17 at 20:41

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