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Foundations The piers of the main spans are founded on cast in situ cylinders which were constructed in open excavations except at the main tower pier no. 3 where a temporary cofferdam was required. The abutments are founded on precast concrete piles. Ismail. I. Al-Bayah and D.J. Lee
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
The Institution accepted a suggestion from the Standing Committee on Structural Safety that guidance on the structural use of chipboard for flooring should be produced which would take into account long-term load effects, deterioration, moisture, misuse, vibration, impact, and local application of load. The Standing Committee pointed out that the properties of chipboard are somewhat different from those of traditional flooring materials in that the critical mode of failure is more likely to be by punching or shear, particularly where there are heavy concentrations of applied load. As the Timber Research & Development Association (TRADA) had, at the same time, requested Government financial assistance to produce a similar document, it was agreed that a joint IStructE/TRADA Working Party should be set up to produce a state-of-the-art report on flooring before the end of 1983.