Concrete
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Concrete is a composite material composed of aggregate bound together with a fluid cement that cures to a solid. It is the second-most-used substance, the most widely used building material, and the m
A single concrete block, as used for construction
Exterior of the Roman Pantheon, finished 128 AD, the largest unreinforced concrete dome in the world.
Interior of the Pantheon dome, seen from beneath. The concrete for the coffered dome was laid on moulds, mounted on temporary scaffolding.
Opus caementicium exposed in a characteristic Roman arch. In contrast to modern concrete structures, the concrete used in Roman buildings was usually covered with brick or stone.
Building material
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Building material is material used for construction. Many naturally occurring substances, such as clay, rocks, sand, wood, and even twigs and leaves, have been used to construct buildings and other st
Concrete and steel rebar used to build a reinforced concrete floor
Wooden church in Bodružal in Slovakia
This wall in Beacon Hill, Boston shows different types of brickwork and stone foundations.
A group of Mohaves in a brush hut