12 BULLETIN 949, U. S. DEPARTMENT OF AGRICULTURE. 
determined on air-dry material. When the aggregate contains an appreciable amount 
of moisture the percentage of water by weight shall be determined and recorded. 
(2) Fill the measure one-third full, puddle with 25 to 30 strokes from a J-inch 
round steel bar 20 inches long, pointed at the lower end. Continue filling and 
puddling in like manner until the measure is full, then strike off the top by a rolling 
motion with the bar. Determine the weight of the contents of the measure and 
calculate the weight in pounds per cubic foot. 
9. SIEVE ANALYSIS OF BROKEN STONE, GRAVEL, PEBBLES OR BROKEN 
SLAG. 
(A. S. T. M. Standard Method, D 1S-16, slightly modified.) 
The method shall consist of (1) drying at not over 110° C. (230° F.) to a constant 
weight a sample weighing in pounds six times the diameter in inches of the largest 
holes required; (2) passing the sample through such of the following size screens 
having circular openings as are required or called for by the specifications, screens 
to be used in the order named: 8.89 cm. (3| inches), 7.62 cm. (3 inches), 6.35 cm. 
(2| inches), 5.08 cm. (2 inches), 3.81 cm. (1J inches), 3.18 cm. (1^ inches), 2.54 cm. 
(1 inch), 1.90 cm. (| inch), 1.27 cm. (J inch), and 0.64 cm. (^inch); (3) determining 
the percentage by weight retained on each screen; and recording the mechanical 
analysis in the following manner: 
Per cen 
Passing 0.64 cm. (I inch) screen 
Passing 1.27 cm. (Hnch) screen and retained on a 0.64 cm. (\ inch) screen. . 
Passing 1 .90 cm. (f inch) screen and retained on a 1.27 cm. f J inch) screen. 
Passing 2.54 cm. (1 inch) screen and retained on a 1.90 cm. (f inch) screen. 
100. 00 
10. SIEVE ANALYSIS OF SAND OR FINE AGGREGATE. 
(A. S. T. M. Standard, Serial Designation: D 7-18, slightly modified.) 
The method shall consist of (1) drying at not over 110° C. (230° F.) to a constant 
weight a sample weighing not less than 100 grams and not more than 500 grams; (2) 
passing the sample through each of the mesh sieves 2 (American Society for Testing 
Materials standard sieves) specified in Table 1; (3) determining the percentage by 
weight retained on each sieve, the sifting being continued on each sieve until less 
than 1 per cent of the weight retained on each sieve shall pass through the sieve during 
the last minute of sifting; and (4) recording the mechanical analysis in the following 
manner: 
Per cent. 
Passing 200-mesh sieve 
Passing 100-mesh sieve and retained on a 200-mesh sieve 
Passing 80-mesh sieve and retained on a 100-mesh sieve 
Passing 50-mesh sieve and retained on an 80-mesh sieve 
100.00 
2 The order in which the sieves are to be used in the process of sifting is immaterial and shall be left 
optional; but in reporting results the order in which the sieves have been used shall be stated. 
