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The paper sets out the background to the introduction of high alumina cement to the manufacture of precast, prestressed concrete components in the United Kingdom and outlines the successive recommendations made for its use. It summarises experience gained from the structural appraisals following the collapse of the roof over the school swimming pool at Stepney and relates the site findings to the results of laboratory research. It suggests that there is no case for the reintroduction of high alumina cement for precast, prestressed concrete but that its use in its original function for concrete to resist seawater and ground waters might be reexamined. S.C.C. Bate
President’s diary On Tuesday 2 December the President will be visiting the Junior Section of the Midland Counties Branch and, at a meeting at 6.0 pm at the Warwickshire CCC Ground, Edgbaston, will give an Address ‘Engineering research-the way and the why’.
The paper describes briefly the developments leading to the need for the appraisal of structures containing elements in high alumina cement concrete; it is based on the author’s experience as consulting engineer and as Convenor of the Institution’s Informal Study Group on High Alumina Cement Concrete. General information is provided on methods of appraisals used, tests, monitoring methods, and factors of safety. The need for further basic and independent research into the various uses of high alumina cement, past and future, is stressed. A.S. Safier