The "secret weapon" of Rome's engineers that enabled them to build bigger, stronger, and faster than anyone else was "water-proof concrete."
The water-proof concrete in the Roman empire was made of volcanic ash, seawater, and lime.
The concrete made the Roman Empire engineers construct buildings and bridges quickly without worrying about reinforcement or the weight and stress the building load would carry.
The waterproof concrete in Roman Empires also helped their building construction to avoid cracks appearing on the structure.
Hence, in this case, it is concluded that the "secret weapon" of Rome's engineers that enabled them to build bigger, stronger, and faster than anyone else was "water-proof concrete."
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