not a natural rock (man-made composite)
Asphalt Concrete
Bituminous Concrete / Asphaltic Composite
Hardness: variable (3-6 for aggregate); Color: black to dark gray with multicolored aggregate; Luster: matte to greasy (bitumen); Structure: granular composite; Specific gravity: 2.1-2.5
- Hardness
- variable (3-6 for aggregate)
- Color
- black to dark gray with multicolored aggregate
- Luster
- matte to greasy (bitumen)
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Physical properties
Hardness: variable (3-6 for aggregate); Color: black to dark gray with multicolored aggregate; Luster: matte to greasy (bitumen); Structure: granular composite; Specific gravity: 2.1-2.5
Formation & geological history
An anthropogenic material formed by mixing mineral aggregate (sand, gravel, or crushed stone) with a petroleum-based binder (bitumen/asphalt). Created in mixing plants at high temperatures.
Uses & applications
Primary use in road construction, parking lots, airport runways, and roofing materials.
Geological facts
Asphalt is 100% recyclable and is the most recycled material in the world. It is a viscoelastic material, meaning it behaves like a solid at low temperatures and a viscous liquid at high temperatures.
Field identification & locations
Identify by its dark gray/black sticky binder and mixed stony aggregate. Found universally in urban environments on road surfaces and pedestrian paths.
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