Bulking Factor For Sand

Bulking factor (%) 1 sand and/or gravel, very soft to soft clay or silt.5 to 20 2 firm (and stiffer) clay and silt, mudstones that break-up easily during excavation, peat.20 to 40 3 weaker rocks that are likely to break into a wide variety of particle sizes, sand to cobble or even boulder.40 to 55 4.