Facts & Figures Book - KPI-JCI

RAILROAD BALLASTBallast is a relatively coarse aggregate which providesa stable load carrying base for trackage as well asquick drainage. Ballast normally would be crushedquarry or slag materials: free of clay, silt, etc.Two typical specifications follow, to provide some ideaas to general gradations:Sieve Example “A” Example “B”Opening Percent Passing Percent Passing3” (76.2 mm) 1002 1 ⁄2” (63.5 mm) 90 -100 1002” (50.8 mm) 96 -1001 1 ⁄2” (38.1 mm) 25 - 60 35 - 701” (25.4 mm) 0 - 153 ⁄4” (19.0 mm) 0 - 131 ⁄2” (12.7 mm) 0 - 5 0 - 5NOTE: The above are typical. However, there are many other ballast sizesdependent on job specifications. Note also that ballast is most usuallypurchased on a unit volume rather than tonnage basis.Quantities of Cement, Fine Aggregate and Coarse AggregateRequired for One Cubic Yard of Compact Mortar or ConcreteMixturesApprox. Quantities of MaterialsC.A.Fine Aggregate Coarse AggregateF.A. (Gravel CementCement (Sand) or Stone) in Sacks Cu. Ft. Cu. Yd. Cu. Ft. Cu. Yd.1 1.5 15.5 23.2 0.861 2.0 12.8 25.6 0.951 2.5 11.0 27.5 1.021 3.0 9.6 28.8 1.071 1.5 3 7.6 11.4 0.42 22.8 0.851 2.0 2 8.3 16.6 0.61 16.6 0.611 2.0 3 7.0 14.0 0.52 21.0 0.781 2.0 4 6.0 12.0 0.44 24.0 0.891 2.5 3.5 5.9 14.7 0.54 20.6 0.761 2.5 4 5.6 14.0 0.52 22.4 0.831 2.5 5 5.0 12.5 0.46 25.0 0.921 3.0 5 4.6 13.8 0.51 23.0 0.851 sack cement = 1 cu. ft.; 4 sacks = 1 bbl.; 1 bbl. = 376 lbs.203