A treatise on concrete, plain and reinforced : materials, construction, and design of concrete and reinforced concrete; 2nd ed. . am similar to that shown on page 194, maybe ascertained readily by drawing three ordinates corresponding respec-tively to screens of 5, 15, and 46 meshes per linear inch, and determiningby the length or the difference in length of these ordinates the proportionswhich pass and which are retained by the screens of these three three proportions or percentages represent the granulometric com- 144 A TREATISE OX CONCRETE position. An illustration of this meth
A treatise on concrete, plain and reinforced : materials, construction, and design of concrete and reinforced concrete; 2nd ed. . am similar to that shown on page 194, maybe ascertained readily by drawing three ordinates corresponding respec-tively to screens of 5, 15, and 46 meshes per linear inch, and determiningby the length or the difference in length of these ordinates the proportionswhich pass and which are retained by the screens of these three three proportions or percentages represent the granulometric com- 144 A TREATISE OX CONCRETE position. An illustration of this method of transforming mechanical analy-sis to granulometric composition is shown in Fig. 57 on page 151. Ferets Triangles. To simplify the tabulation of results, and arrangethem so that they may be understood at a glance, Mr. Feret has used agraphical arrangement which is exceedingly ingenious. In nearly allhis writings we find little triangles with the apexes labeled G, M, and or contours in these triangles, representing the various propertiesof the sands or mortars, are based on a system of three instead of two Fig. 50.—Ferets Three-Screen Method of Analyzing Sand. • (See p. 144.) co-ordinates, that is, each curve is the loci of points measured from 3 axesplaced at angles of 60° with each other. A full discussion of the theory ofthis is given in his paper Sur la Compacite des Mortiers Hydrauliques in Annales des Fonts et Chaussees, 1892, II, but the principles may be un-derstood by reference to Fig. 50. The apexes of the triangle are labeledG, M, and F, corresponding to the three sizes of sand described on page granulometric composition of any sand is plotted as a single point inthis triangle. The proportion of each of the three sizes in the sand is rep-resented by its perpendicular distance from the side opposite each apex. STRENGTH OF CEMENT AfORTARS 145 For example, exactly at the apex G, the granulometric composition isor = , m = o, f = o. A s
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