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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 first 75th Anniversary function held out-of-house was the Thanksgiving Service at Sr. Lawrence Jewry on 24 November 1983, followed by a Reception at the Guildhall. Nearly 300 members and guests attended the Service and heard the follo wing address by Dr. George Geddes, CBE, FEng (Past President)
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