Facts & Figures Book - KPI-JCI

Washin g/Classifyin gThis term is used to denote the distribution of sizes of theparticles of aggregates. It is represented by a series of percentagesby weight of particles passing one size of sievebut retained by a smaller size. The distribution is determinedby a mechanical analysis performed by shaking theaggregate through a series of nested sieves or screens,in descending order of size of openings. Round openingsare used for larger screens, square ones for the smallersieves. Prescribed methods and prescribed openings ofthe screens and sieves have been established by theASTM (American Society for Testing Materials). The normalseries of screens and sieves is: 1 1 ⁄2”, 3 ⁄4”, 3 ⁄8”, Numbers4, 8, 16, 30, 50, 100, 200 mesh.94GRADATION OF AGGREGATESSIEVES FOR TESTING PURPOSESScreen or Sieve Nominal Opening EquivalentsDesignation mm inches microns4” 101.63” 76.22” 50.81 1 ⁄2” 38.11” 25.43⁄4” 19.11⁄2” 12.73⁄8” 9.521⁄4” 6.35No.4 4.76 0.187 47606 3.36 0.132 33608 2.38 0.0937 238012 1.68 0.0661 168016 1.19 0.0469 119020 0.84 0.0331 84030 0.59 0.0232 59040 0.42 0.0165 42050 0.297 0.0117 29770 0.210 0.0083 210100 0.149 0.0059 149140 0.105 0.0041 105150 0.100 0.0039 100200 0.074 0.0029 74270 0.053 0.0021 53400 0.037 0.0015 37