Author: Ruthen, Sir Charles T
First published: N/A
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Ruthen, Sir Charles T
V.-CONCRETES AT BASIC WATER CONTENT.
Several tests were made at basic water content using 25 F.A. mixed in three proportions, the ratios of cement to mixed aggregate by bulk being approximately 1:8, 1:5, and 1:2 1/2 or 3.
Unlike the great exhibition of 1851, where a colossal experiment in constructional engineering in glass and iron reacted upon the building methods of the whole civilised world, the far larger exhibition at Wembley is in some respects less ambitious and clings fairly closely to the normal methods of design and construcfion. Colour is also lacking, and the British Empire Exhibition is probably the first in which the principal
palaces have been left in the unpalatial and retiring hue of dingy grey. Adequate performance of function should take precedence over artistic presentation, and the vast crowds at Wembley view the exhibits in reasonable comfort.
The Pont du Val Benoit, Liege, is a long stone bridge of five arches supported on four piers and two abutments, the footings of which, in poor soil, are anchored by means of a series of wooden piles, the heads of which project into the masonry. It was found, however, that the stream, especially at periodical flood time, produced disturbing scour, which was undermining the bridge supports. To remedy this, these supports have been enclosed in a type of cofferdam carried out thus : Reinforced concrete piles were moulded, 12 in. by 12 in. and 25 yd. long, which were driven close together round the footings, with a slight inward inclination. Owing to the unevenness of the ground a rather irregular enclosure was formed, but where the breach was considerable, the opening was blocked with flat bags of cement. - Le Constructeur de Ciment Armé. No. 56, 1924.