Rock weight
To understand the answer, we need to know something about the rocks’ weight. This is not straightforward because rocks have different complex shapes, and different mineral compositions with varying densities. However, the weight of a rock increases significantly as its diameter increases, as shown in the table below.
The rock size defines the crusher gap: a) Minimum crusher gap. b) Maximum crusher gap.
Maximum: 500 mm (20”)
Typical stone sizes and weights for blasted and crushed rock.
Typically a dump body is loaded with a mix of rocks, sand, clay and water and contains voids, so the rock density is not directly proportional to the volume of the body. A typical density for crushed aggregate is around 1600 - 1800 kg/m3 (100 – 112 lb/ft3) and the density of granite is 2520 - 2810 kg/m3 (157 - 175 lb/ft3). Because the largest rocks are the ones that cause dents, the rock density is worthwhile considering. Other properties, such as toughness, will also play an important role in dent resistance.
Weight of granite rock of different sizes.
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