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Asphalt versus bitumen

Short answer

Asphalt is a mixture of bitumen with mineral matter (sand, aggregate) that provides load-bearing strength for roads and flooring. Bitumen is the pure black hydrocarbon binder obtained from petroleum refining, soluble in CS2 with very low mineral content, and acts only as a binder in construction.

Differentiate between asphalt and bitumen.

Asphalt is a mixture of bitumen with mineral matter (sand, filler or aggregate), either natural (rock asphalt, lake asphalt) or artificial. Bitumen is the sticky black hydrocarbon binder, obtained from crude oil refining (residue) or natural deposits, and is the main binding component of asphalt.

PointAsphaltBitumen
CompositionBitumen + mineral matter (sand, stone dust, aggregate)Pure hydrocarbon (carbon and hydrogen) with little mineral matter
SourceNatural deposits, or made by mixing bitumen with aggregateDistillation residue of petroleum, or natural
Mineral contentHigh (can be up to 80–90% in rock asphalt)Very low
Solubility in CS2_2Partly soluble (mineral part remains)Almost fully soluble
StateSolid or semi-solid mixtureViscous liquid to semi-solid
UseRoad surfacing, flooring, waterproofing, roofingBinder for roads, waterproofing, paints, felt
StrengthGives load-bearing wearing courseOnly a binder, no strength alone
Temperature useMixed hot (hot-mix asphalt)Heated to make it workable

In American usage "asphalt" means what is called "bitumen" elsewhere; the above is the IOE textbook difference.

✓ Answer checked by Claude Opus 5.5 (high effort)

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