Size & Grading Requirements for Coarse Aggregates
3/4 inch 1/2 inch: 3/8 inch #4 #8 #10 #16 #20 #40 #50 #100 #200: 100mm 90mm; 75mm 63mm; 50mm 37.5mm; 25mm 19mm; 12.5mm 9.5mm; 4.75mm 2.36mm; 2mm 1.18mm; 850. µm. 425. µm. 150. µm-4; 1 1; ... * Gradation Numbers 24, 25, 3, 4A, and 4 are main line ballast materials * Gradation Numbers 5 and 57 are yard ballast materials.
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