Why did Roman concrete last so long?
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Herein, why is Roman concrete not used today?
This aggregate has to be inert, because any unwanted chemical reaction can cause cracks in the concrete, leading to erosion and crumbling of the structures. This is why concrete doesn't have the longevity of natural rocks. But that's not how Roman concrete works.
Additionally, why have Roman roads lasted so long? They're built for light loads: marching men and the occasional horses or cart. Modern vehicle traffic would destroy them in short order. The illusion of their durability comes from the Romans having built so many of them. But those little fragments of the old Roman road system survived because they weren't used.
Considering this, why did Roman concrete still stand strong?
When seawater gets into its cracks, it causes a chemical reaction that actually strengthens the concrete. Minerals called Al-tobermorite and phillipsite form as the material leaches mineral-rich fluid that then solidifies, reinforcing the concrete and making the structures even stronger.
How did concrete help the Romans?
They found that the Romans made concrete by mixing lime and volcanic rock to form a mortar. To build underwater structures, this mortar and volcanic tuff were packed into wooden forms. In addition to being more durable than Portland cement, argue, Roman concrete also appears to be more sustainable to produce.