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The Structural Engineer, Volume 7, Issue 10, 1929
The inherent and peculiar advantages of the tube as a structural element have many times received consideration in print, and, in aeronautical and automobile construction, in the steel furniture industry and in certain other specialised fields, these advantages have already been turned to practical account. The special benefit attaching to the tubular section lies, of course, in a moment of inertia which is of equal magnitude in all directions, enabling the maximum resistance to buckling to be achieved with the lowest possible area of crosssection and hence the minimum weight. Hitherto, it has rarely been found possible, however, to apply the tubular principle to structural steelwork, for rivetting and bolting are highly unsuitable for the jointing of tubes.
In these days the synthetic side of concrete technology receives a tremendous amount of attention, dealing as it does with the state of the materials and the methods whereby certain results can be obtained. It is, however, with the converse of these methods I wish more particularly to deal in this paper, i.e., the analytical treatment, when the start is made with the result in the form of a piece of concrete. Physical and chemical tests are then applied with the object of reconstructing in detail its formation and history, from the time when it was in separate constituents, through the period of mixing, the curing period immediately following its set, and thence t0 the time of examination. J.E. Worsdale
Deaerated concrete is an invention, protected by patent, for mixing concrete in a vacuum, with the object of improving the quality as regards both strength and density.