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Nine Arch Bridge Demodara masonry: brick arch compressive load transfer and cement mortar curing?

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A
Arjun Viaduct•940 rep

What structural load distribution principles allowed P.K. Appuhami and British engineers to construct the curved 300-foot Nine Arch viaduct without structural steel rebar?

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The Nine Arch Bridge (Ahas Namaye Palama) at Demodara spans a 300-foot gorge on a 10-degree curve. Built during World War I when British steel supplies were diverted to European war efforts, local builder P.K. Appuhami and railway engineers constructed the entire viaduct of hand-cut granite stone blocks and kiln-fired clay bricks bonded with hydraulic lime-cement mortar without a single piece of structural reinforcing steel. The nine semi-circular arches function strictly in compression: the dead weight of the masonry and dynamic loads of passing broad-gauge trains are transferred downward along catenary thrust lines into massive stone piers anchored into valley bedrock.

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Eng Jayasinghe Rail•1870 rep

Temporary timber scaffolding assembled from surrounding jungle trees supported green brick arches until central keystone blocks were driven home.

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A
Arjun Viaduct•940 rep

Masonry drainage weep-holes built into arch spandrels prevent rainwater pooling, allowing water to drain without developing internal hydrostatic bursting pressure.

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Minoli Rampart•1840 rep

The viaduct has survived over a century of continuous heavy broad-gauge passenger and freight traffic without exhibiting structural foundation settling.

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Guru Dharmasena Wood•1830 rep

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