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The Craigellachie bridge, over the River Spey at Craigellachie, Banffshire, was originally designed and constructed in cast iron by Thomas Telford in 1814-15. It was reconstructed in 1963-64 to make it capable of carrying modern traffic not greater than 14 tons the bridge, it was essential to keep as much of the original character
in weight. In addition, it was recognized that, in reconstructing as possible; when a new bridge is constructed nearby, the cast-iron bridge is to be restored to a condition which will enable it to be retained for as long as possible as a monument to Thomas Telford and his work.
Mr. Peter Dunican, introducing his paper, said that the title ‘ The art of structural engineering ’ had been chosen quite deliberately because, although it was a matter
which he might not be able to pronounce upon too clearly, it was a subject which as a practising structural engineer he ought to know something about.
This paper describes tests that have been carried out to determine the long-term deformation characteristics of Lytag lightweightaggregate concrete, in axial compression and deflection; comparisons are made with gravel concretes made from London-area aggregates.
Professor R.H. Evans and W.S. Paterson