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The Structural Engineer, Volume 71, Issue 2, 1993
The damage to concrete structures from expansive and disruptive alkali-silica reaction (ASR), which first became apparent in the UK in the late 1970s, necessitated the development of new inspection, testing and appraisal procedures. These were brought together in the 1988 IStructE report Structural effects of alkali-silica reaction, interim technical guidance on appraisal of existing structures. This has been substantially revised and updated in the 1992 Technical guidance to incorporate recent research and the practical experience in the use of the 1988 report. J.G.M. Wood and R.A. Johnson
This paper presents a case history of onsite load testing of structures. A hollow plank floor assembly contained within a 1960s low-rise housing unit was tested, and details are given of the preparation of the test area, the choice of instrumentation, and the test loading adopted. R.M. Moss and R.S. Matthews
Reading the viewpoint’ by E. W. H. Gifford, ‘Recollection of structural changes in the last 50 years’, prompted me to start a project I have been mulling over in my mind for several years. The project is to write an account of work in the 1950s, ’60s and perhaps the ’70s before recollections fade and the historical lessons learnt are lost in speculations of what may have happened in the past. I think it is important for future generations of engineers to have the knowledge of achievements and failures available for study to save time and effort and, perhaps, mistakes in the future. I shall start with what may be the most contentious subject, high-rise flats. T. Harley-Hadow