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History
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Pre-tensioned bridge girder in precasting bed, with single-strand tendons exiting through the formwork
Pre-tensioned bridge girder in precasting bed, with single-strand tendons exiting through the formwork
Pre-tensioned hollow-core plank being placed
Pre-tensioned hollow-core plank being placed
Post-tensioned tendon anchorage; four-piece "lock-off" wedges are visible holding each strand
Post-tensioned tendon anchorage; four-piece "lock-off" wedges are visible holding each strand
Balanced-cantilever bridge under construction. Each added segment is supported by post-tensioned tendons
Balanced-cantilever bridge under construction. Each added segment is supported by post-tensioned tendons
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A single concrete block, as used for construction
A single concrete block, as used for construction
Exterior of the Roman Pantheon, finished 128 AD, the largest unreinforced concrete dome in the world.
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.
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
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.