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The desirable properties of bitumen depend on the mix type and
construction. In general, Bitumen should posses following desirable properties.
- The bitumen should not be highly temperature susceptible: during the
hottest weather the mix should not become too soft or unstable,
and during cold weather the mix should not become too brittle causing cracks.
- The viscosity of the bitumen at the time of mixing and compaction should
be adequate.
This can be achieved by use of cutbacks or emulsions of suitable grades or by
heating the bitumen and aggregates prior to mixing.
- There should be adequate affinity and adhesion between the bitumen and
aggregates used in the mix.
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