SAMPLING AND TESTING HIGHWAY MATERIALS. 

 Table I. — A. S. T. M. standard sieves. 



13 



Mesh designation. 



Unit of measure. 



Actual 

 mesh. 



Opening. 



Wire 

 diameter. 



Permissible varia- 

 tions. 





Mesh. 



Diameter. 



10> 



/Centimeter 



3.9 

 9.9 

 8 



20.3 



12.0 



30.5 



16 



40.6 



20 



50.8 



31 



78.7 



39 



99.1 



79 

 200.7 



0.200 

 .079 

 .085 

 .0335 

 .050 

 .0197 

 .036 

 .0142 

 .029 

 .0114 

 .017 

 .0067 

 .014 

 .0055 

 .0074 

 .0029 



0. 056 

 .022 

 .040 

 .0157 

 .033 

 .0130 

 .026 

 .0102 

 .021 

 .0083 

 .015 

 .0059 

 .0116 

 .0046 

 .0053 

 .0021 



0.04 

 .1 

 .2 

 . 5 

 .4 



1.0 

 .6 



1.5 

 .8 



2 



1 



3 



1 



3 



3 



8 



0.005 







20 



/Centimeter 



.0015 







30 



/Centimeter 



.0012 







40 ) 



1 Centimeter 



.0010 







50 



/Centimeter 



.0010 

 .0004 



801 



/Centimeter 



.0008 







1001 



fCentimeter 



.0008 







2001 , 



/Centimeter 



.0005 





.0002 









1 The J-inch circular opening screen and these sieves are recommended for the sieve analysis except for 

 fine aggregate used in bituminous surfaces. 



11. SIEVE ANALYSIS OF MIXTURES OF FINE AND COARSE AGGREGATES. 



(A. S. T. M. Standard Method, Serial Designation: D 19-16, 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) separating the sample by the use of a screen having circular open- 

 ings 0.64 cm. (£ inch) in diameter; (3) examining the portion retained on the screen 

 in accordance with the standard method for making a sieve analysis of broken stone, 

 gravel, pebbles, or broken slag (test No. 9), examining the portion passing this screen 

 in accordance with the standard method for making a mechanical analysis of sand 

 or other fine aggregate (test No 10); (4) and 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 10- mesh sieve and retained on a 20- mesh sieve 



Passing 0.64-cm. (J-inch) screen and retained on a 10- mesh sieve 



Passing 1.27-cm. (^-inch) screen and retained on a 0.64-cm. (J-inch) screen 



Passing 1.90-cm. (f-inch) screen and retained on a 1.27-cm. (^-inch) screen 



100 



In the sieve analysis of the sand fraction, the following sizes of sieves shall be 

 used except for fine aggregate used for bituminous surfaces: £-inch circular opening, 

 10-mesh, 40-mesh, 80-mesh, 100-mesh, and 200-mesh. 



