ERIC Number: ED119325
Record Type: Non-Journal
Publication Date: 1974-Jun
Reference Count: N/A
Report on the Failure of Roof Beams at Sir John Cass's Foundation and Red Coat Church of England Secondary School, Stepney. Building Research Establishment Current Paper 58/74.
Bate, S. C. C.
Two beams forming part of the roof over the swimming pool at the school collapsed. The investigation showed that the cause of the failure was loss of strength due to conversion of high alumina cement concrete followed by sulphate attack leading to disruption of the concrete. The degree of conversion and loss of strength was greater than expected for the quality of concrete specified, and it was inferred that this may have been due to a combination of the following factors: (1) the freewater/cement ratio may have exceeded the maximum of 0.4 aimed at in production; (2) the temperature during the first day after casting may have been excessive; and (3) the aggregate used, which contained the minerals feldspar and mica, had an accelerating effect on the rate of conversion and loss of strength. Details are given of the results of the tests carried out during the investigation. (Author)
Descriptors: Architectural Research, Construction Materials, Construction (Process), Failure, Prestressed Concrete, Research Reports, Roofing, School Buildings, Secondary Education, Structural Building Systems
Distribution Unit, Application Services Division, Building Research Establishment, Garston, Watford, WD2 7JR, England
Publication Type: Reports - Research
Education Level: N/A
Authoring Institution: Building Research Establishment, Watford (England).
Identifiers - Location: United Kingdom (England)