Author: McCarthy, M J
First published: N/A
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McCarthy, M J
MR. H. GARDINER LLOYD (Member), speaking as one who for many years had been engaged on the supervision of constructional work as well as laboratory work, first expressed agreement with Mr. Worsdale that metal and not wood should be used for moulds, and also pointed out that different results might be obtained in the compression test by using different packings between the cubes and the platens. He believed that a great deal of work had been done by the American Society for testing materials in this connection, and reference to that work would be helpful. Referring to Mr. Worsdale’s statement that, "if a cube face were seriously pitted, probably the best results could be obtained bv covering the surface with a layer of neat plaster, this being allowed to set, either between the plates of the machine or in contact with a plane glass or metal surface,” he said it should be borne in mind that this layer should be exceedingly thin, because if one put on a layer 1/4-in. thick, and the material happened to be weaker than the cube, the strength as indicated by the test would be much lower than if no such layer were used. One must be very careful to ensure that such a mistake was avoided. With regard to the concrete cubes mentioned at the top of page 360, which were tested in two different laboratories and yielded results which differed considerably, it woidd be interesting to know who had filled the moulds.
To the Editor of The Structural Engineer. Sir,-Our attention has been drawn to a paper entitled “Casing Piles, Damaged by Marine Worms, in Reinforced Concrete and Other Repairs at Swanage Pier,” by Major F. M. DuPlat Taylor, read before the members of the Institution of Structural Engineers, and published in the May issue of The Structural Engineer.
Rebuilding on sites already occupied is a, common enough experience nowadays and the problems in connection with the design and ccnstruction of the foundations are often numerous and interesting. Sites in congested areas of towns, and bounded by party walls with soil of low bearing value are, of course, the most difficult to deal with. The question as to how much, if any, of the existing foundations can economically be utilised has to be considered, but in the majority of cases, as new buildings are both considerably higher and deeper than formerly, the increased loads on the foundations usually make it unnecessary to seriously consider this question. T.F. Burns