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Post-tensioned concrete bridges have been in use since the late 1950s. This type of design was thought to bring with it the benefits of structures larger and more slender than had been possible by conventional design up to this time. It was not until the mid 1960s that the first signs of problems in this type of structure first showed up. T.J. Lee
Roger Evans has been Bridgemaster and Engineer for the Humber Bridge ‘one of the technically most perfect suspension bridges in the world’, for the past 7 years. Prior to that he was Deputy Bridgemaster for 12 years, having previously worked for contractors and more latterly as a bridge designer in local government. Kathy Stansfield
I described site silane problems in 1997 and, since specifiers continue to invoke this expensive treatment, I thought it time to write a critique based on Second Severn Crossing (SSC) and other site experience. Dr Maurice Levitt