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APPROXIMATE WEIGHTS IN POUNDS PER CUBIC YARDOF COMMON MINERAL AGGREGATES WITH VARIOUSPERCENTAGES OF VOIDS(SPECIFIC GRAVITY OF 1 = APPROX. 1685 LBS.)Percentage of VoidsSpecificMaterial Gravity 25% 30% 35% 40% 45% 50%2.8 3540 3300 3070 2830 2600 2360Trap 2.9 3660 3420 3180 2930 2690 2440Rock 3.0 3790 3540 3290 3030 2780 25303.1 3910 3650 3390 3130 2870 2610Granite 2.6 3280 3060 2850 2630 2410 2190and 2.7 3410 3180 2960 2730 2500 2270Limestone 2.8 3540 3300 3070 2830 2600 23602.4 3030 2830 2630 2420 2020 20202.5 3160 2950 2740 2520 2310 2100Sandstone 2.6 3280 3060 2850 2630 2410 21902.7 3410 3180 2960 2730 2500 22702.0 2530 2360 2190 2020 1850 16802.1 2650 2470 2300 2120 1950 17702.2 2780 2590 2410 2220 2040 1850Slag 2.3 2900 2710 2520 2320 2120 19402.4 3030 2830 2630 2420 2220 20202.5 3160 2950 2740 2520 2310 2100GranulatedSlag 1.5 1890 1770 1640 1510 1390 1260GravelSand 2.65 3350 3120 2900 2680 2450 2230NOTE:Most limestone, gravel and sand will absorb one percent or morewater by weight. Free water in moist sand approximates two percent,moderately wet 4 percent, and very wet seven percent.Ashes, Dry...................... 33°Ashes, Moist................... 38°Ashes, Wet...................... 30°Asphalt............................ 45°Cinders, Dry.................... 33°Cinders, Moist................. 34°Cinders, Wet................... 31°Cinders & Clay................ 30°Clay................................. 45°DUMPING ANGLESAngles at which different materials will slide on steelCoal, Hard....................... 24°Coal, Soft........................ 30°Coke................................ 23°Concrete.......................... 30°Earth, Loose.................... 28°Earth, Compact............... 50°Garbage.......................... 30°Gravel.............................. 40°Ore, Dry.......................... 30°Ore, Fresh Mined............. 37°Rubble............................ 45°Sand, Dry........................ 33°Sand, Moist..................... 40°Sand & Crushed Stone.... 27°Stone.............................. 30°Stone, Broken................. 27°Stone, Crushed............... 30°225
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