The Structural Engineer > Archive > Volume 2 (1924) > Issues > Issue 12 > The International Cement Congress. Report of the Discussion of Papers read before the Congress (Cont
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The International Cement Congress. Report of the Discussion of Papers read before the Congress (Continued)

Colonel J. Mitchell Moncrieff, C.B.E., M.INST.C.E.(Association of Consulting Engineers) agreed with M. Forchhammer. Before the war, he said, Messrs. Redpath Brown & Co., through their chairman, Sir John Cowan, had approached him with regard to a testing machine they had given to the National Physical Laboratory, and, with regard to certain tests they wished to make, they had this type of construction in their minds. Owing to the war the tests were held up. Tests had been carried out on a few structures, however, and although they were necessarily incomplete, they indicated that there was something to be done in the future in the way of what Mr. Andrews called steelwork reinforced with concrete. To illustrate that, Colonel Moncrieff referred to a test made at the National Physical Laboratory on a 4 in. by 3 in. steel joist covered all round with at least 2 in. of concrete. That made a column something like 7 in. by 6 in., and the column was 16 ft. long, between the points of bearing, including the universal joints at each end. A similar steel joist, without concrete on it, was also tested. The naked joist, which was also 16 ft. long, failed at about 4 tons. The joist coated with concrete carried from 45 to 50 tons. That was worth thinking about. If they could put up the framework of a building, sufficient to carry the mere weight of the structure itself, in concrete, with the addition of tension members, as M. Forchhammer had said, think of the saving in staging! If they could make the bones of the structure carry the flesh until that flesh had sufficient strength in it to act, there was something to be thought about.