The Structural Engineer > Archive > Volume 3 (1925) > Issues > Issue 8 > Correspondence New British Steel Beam Sections and Fineness of Particles
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Correspondence New British Steel Beam Sections and Fineness of Particles

Sir - I am grateful for the support which Mr. Spencer gives in his letter towards the more extensive use of the New Sections, and for adding another to the list of those already rolled given by me. Sir - May I suggest that the explanation why cement of flattened grain particles gives higher tensile (or compressive) strength is not "mechanical interlocking power;" but a greater exposed surface. The "gell" or "quick" state of the cement particles after the addition of water, will manifestly reach the centre of the flattened grain more rapidly than for a particle with less exposed surface but equal volume.