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The subject of prestressing covers a process that is relatively new and the inventor and chief protagonist of which died only 20 years ago-Eugene Freyssinet. Indeed, the major innovations in prestressed concrete, and the notable structures that have resulted, have come about in the last 40 years or so; the ‘childhood’ will therefore deal only with a short time-span, up to about 20 years ago. F. Walley
The paper describes the design and construction of Adhamiyah Bridge over the River Tigris in Baghdad. Of steel construction acting compositely with a concrete deck, the cable-stayed bridge is the first of this type to be erected in the Middle East. D.J. Lee and A. Wallace
The literature dealing with the expansion of concrete due to alkali-silica reaction (ASR) is reviewed and experimental work currently in progress at the Cement & Concrete Association is described. It is shown that concrete containing a reactive aggregate and a UK cement is unlikely to exhibit deleterious expansion due to ASR if the alkali content of the concrete, expressed as equivalent Na20, is less than 4 kg/m3. D.W. Hobbs