Author: Percy, A L
First published: N/A
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Percy, A L
Mr. MACBRIDE, having presented the paper, exhibited a cinematograph film showing some of the details of the welded joints and of the structure generally, and the actual process of welding. He commented upon the extreme simplicity of the floor beams, and
upon the fact that the connections were welded very quickly.
SIR,-The papers by Dr. Cassie on "Bond Resistance of High Strength and Vibrated Concrete," and Dr. Evans on "Stresses in the Steel Reinforcement of Reinforced Structures," may properly be discussed together, as they both deal with the allied phenomena of adhesion and creep. Elsewhere I have tried to show that these phenomena depend on the fundamental properties of colloid gels, of which hydrated Portland cement-in its early stages-is an example; that creep is due to the expulsion of colloid water, which has since been largely confirmed by Davis's experiments; and that bond is due to adhesion-not friction-and bond resistance depends on the initial shrinkage in the concrete. The following remarks spring largely from these theses; and it is hoped that they may give rise to some of that acute disagreement which generally leads to an interesting discussion.
Mr. C. J. JACKAMAN, A.M.Inst.C.E. (Member of Council), proposed a hearty vote of thanks to Mr. Turner for his very instructive and interesting paper. Mr. Jackaman confessed that he was almost envious of Mr. Turner’s experience, which must be unique in its character, because he had been dealing with very heavy structures built on strata such as we could not visualise in this country; and he was to be congratulated most heartily on the success which had attended his efforts.