A treatise on concrete, plain and reinforced : materials, construction, and design of concrete and reinforced concrete; 2nd ed. . PER CENT BY WEIGHT PASSING SIEVES 198 A TREATISE ON CONCRETE described on page 280, i 000 grams is a convenient quantity for 8-inchdiameter sieves 21 inches in depth, and also permits of easy reduction fromweights to percentages. To obtain the analysis shown in Fig. 70, thesample of stone is placed in the upper (coarsest) sieve of the nest of stonesieves given on page igo, and after i 000 shakes the nest is taken apart, andthe quantity caught on each sieve is weighe
A treatise on concrete, plain and reinforced : materials, construction, and design of concrete and reinforced concrete; 2nd ed. . PER CENT BY WEIGHT PASSING SIEVES 198 A TREATISE ON CONCRETE described on page 280, i 000 grams is a convenient quantity for 8-inchdiameter sieves 21 inches in depth, and also permits of easy reduction fromweights to percentages. To obtain the analysis shown in Fig. 70, thesample of stone is placed in the upper (coarsest) sieve of the nest of stonesieves given on page igo, and after i 000 shakes the nest is taken apart, andthe quantity caught on each sieve is weighed. The results obtained in the. DIAMETERS OF STONE IN INCHES Fig 70. • Typical Mechanical Analysis of Crusher-Run MicaceousQuartz Stone. (See p. 198.) particular case under consideration are illustrated in the following tablewhich shows the method of finding the percentages: Results of Screening Samples 0} Stone oj Fig. 70. Size sieveinches. Retained each sie\ grams. in e* Amount finer than each sieve grams. Percentage finerthan each sieve % 8 0 II 8 I 8 19 2 72 27 3 1^3 99 10 235 222 22 I-50 344199 457801 4680 Total, 1000 *In practise this column is not required, the weights in the next column being obtained directlyby placing each successive residue on the scale pan with that already weighed. The various percentages are plotted on the diagram and the curve drawnthrough the points. The vertical distance from the bottom of the diagram PROPORTIONING CONCRETE 199 to the curve, that is, the ordinate at any point, represents the percentageof the material which passed t
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