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Tensile stresses in concrete Several of our readers have commented on the reservations expressed by Mr V. T. Pannell, which we supported, regarding the ability of concrete to resist tensile stress; these appeared last July and were discussed further in October, when Mr R. 0. C. Seaman wrote to us. We have now heard further from Mr Seaman: Further to my previous letter and the reservations expressed about the application of concrete in tension, I would quote in further support of my contention, Table 11 of Civil Engineering Code of Practice no. 2: Earth retaining structures, which gives recommended permissible tensile stresses for mass concrete in flexure of 40 lb/in2 (0.3 N/mm2) for a 1:2:4 mix.