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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
Friarton Bridge over the River Tay at Perth is a multispan bridge comprising two independent welded steel box girders, each with a composite lightweight concrete deck slab. The bridge is notable for being one of the first in the United Kingdom to use structural lightweight concrete in its construction, which made composite construction economic for the river span; also for being the first major structure to be designed to the ‘Interim Design and Workmanship Rules’ (successor to the ‘Merrison’ Rules). O.A. Kerensky, J. Robinson and B.L. Smith
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