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.
Asphalt concrete
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Asphalt concrete or asphaltic concrete is a composite material commonly used to surface roads, parking lots, airports, and the core of embankment dams. Asphalt mixtures have been used in pavement cons
Concrete
…most widely used building material, and the most-manufactured material in the world. Cement-bound concrete differs from the less rigid, less durable asphaltic concrete, which has a bituminous binder. When aggregate is mixed with dry Portland cement and water, the mixture forms a fluid slurry that can be poured and…
Asphalt batch mix plant
A machine laying asphalt concrete, fed from a dump truck
Tar being applied to a London road during World War I
Globe Lane being resurfaced by workers in Chatham, Kent, England