The Structural Engineer > Archive > Volume 20 (1942) > Issues > Issue 7 > Correspondence. Discussion on the Paper by Dr. W.T. Marshall and Mr. R.N. Tembe Experiments on Plain
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Correspondence. Discussion on the Paper by Dr. W.T. Marshall and Mr. R.N. Tembe Experiments on Plain and Reinforced Concrete in Torsion (“The Structural Engineer,’’ March 1942, pp. 39-42)

As in the Author’s Reply (“Structural Engineer,” May 1942), it is stated they are interested in my answering certain questions submitted. I am pleased to give these as under: (1) The value of 800 lbs./sq. in. for the shear stress obtained by Freyssinet in an unreinforced specimen is certainly high. Freyssinet applied for the manufacture of these very small specimens the application of his process of vibration, compression (by hydraulic pressure) and heating in strong tubular moulds. (This compression applied for manufacturing the specimen is not to be confused with the precompression applied on a part of the specimen by pre-stressing of the reinforcement).