100 lb of loose gravel can fill a 1-ft^3 box. Its specific gravity is 2.68. What is the dry rodded weight? Find the volume of voids in the preceding problem.

Answer 1

2.68 * 62.4 = 167 lbs/ft^3 if it were solid rock
so (167 - 100) = 67 pounds missing in voids

67 lb * 1 ft^3/167 lb = .4 ft^3 empty space

check .6 * 167 = 100