The Structural Engineer > Archive > Volume 5 (1913-15) > Issues > Issue 3 > Sand and coarse material and proportioning concrete
Name of File 6905-10005-03.pdf cached at 12/12/2017 10:30:22 - with 43 pages. pdfPath: E:\k9.istructe.org\CMS\webtest\files\89\89c0685e-854c-42fe-b51f-07c036d0486b.pdf. thumbPath: E:\k9.istructe.org\CMS\webtest\files\pdfthumbs\89c0685e-854c-42fe-b51f-07c036d0486b_1.png. objDoc: 1 - True. objPreview.Log: . strFileName: 89c0685e-854c-42fe-b51f-07c036d0486b_1.png

Members/subscribers must be logged in to view this article

Sand and coarse material and proportioning concrete

In correctly made concrete the amount of sand should be just sufficient to fill the voids in the coarse material, and the amount of cement just sufficient to fill the voids in the mixture of sand and coarse material and to coat all the particles with very thin jointing layers. It is a rational assumption that such concrete will give the maximum of strength with the minimum of cost, and if such assumption be justified by experimental results it follows at once that the proportioning of concrete-forming materials is of the utmost importance. Greater strengths can be obtained by the use of excess of cement, as in the case of the ordinary mix of 1-2-4., but the increase in strength is less than the increase of cost of materials, and is, therefore, only justified in particular cases. John A. Davenport