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Question:

which is heavier: concrete or steel?

a concrete or steel building?also, what is the density of concrete and steel? is concrete heavier in steel for the same volume?

Answer:

Steel is heavier than concrete for the same volume, however steel buildings are generally lighter. This is because steel buildings utilize high strength of steel, so volume of steel in steel buildings is much smaller than volume of concrete in concrete buildings. In another words in steel buildings much less volume of material is needed for the same strength compared to concrete buildings.
minorchord2000 an engineer using a non-metric measuring system - it's priceless
The denisty of reinforced concrete is taken to be 150 lbs/ft^3 The density of carbon structural steel is 490 lbs/ft^3

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