Question

what did romans use to support high amounts of weight and reduce the amount of concrete needed? type your answer...

Explanation:

The Romans used arches (and also vaults, but arches are a key element) to support heavy weights and reduce the amount of concrete or building material needed. Arches distribute weight effectively, transferring it to supports (like columns or piers) and allowing for larger spans with less material compared to flat structures. Additionally, they used a technique with a framework of bricks or stones (opus caementicium with a rubble core, often using arches and vaults) but the primary structural element for weight support and material reduction was the arch (and vaults, which are a series of arches).

Answer:

Arches (and vaults, with arches being a primary element) were used by Romans to support high amounts of weight and reduce the amount of concrete (or building material) needed.