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.
Portland cement
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Portland cement is the most common type of cement in general use around the world as a basic ingredient of concrete, mortar, stucco, and non-specialty grout. It was developed from other types of hydra
Concrete
…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 molded into shape. The cement reacts with the water through a process called hydration…
Bags of Portland cement wrapped and stacked on a pallet.
Blue Circle Southern Cement works near Berrima, New South Wales, Australia
Plaque in Leeds, England commemorating Joseph Aspdin
William Aspdin is considered the inventor of "modern" Portland cement.