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The actual performance of the bitumen depends on the total performance of a bitumen / aggregate mixture which again depend as the design of the mixture, the way it was mixed and how it was laid and compacted.
Minimise the time during which hot bitumen is exposed to air. Bitumen hardens and loses some of its adhesive property when it is exposed to a combination of air and heat.
Careless mixing of bitumen and aggregate is an example of a practice that exposes bitumen to the air and heat for longer than the minimum time required to coat the aggregate. it is therefore likely to reduce the bitumen's performance as an adhesive.
Keep bitumen dry and away from contamination by water at all times. When it comes into contact with water it will foam.
Keep bitumen within the range of temperatures recommended for the type and grade.
Bitumen solidifies as it cools and becomes unworkable, and the viscosity may increase if it is overheated. It is sensible to use bitumen at the lowest temperature that will permit it to be mixed, transported and compacted but in any case the maximum storage temperature relating to the grade should not be exceeded during the mixing process.
Temperature control is a major factor in the quality control of a bitumen / aggregate mixture. Avoid contaminating the bitumen, particularly with petroleum based solvents that reduce the Flashpoint and the viscosity and increase the penetration. just 0.1% diesel oil in a bitumen / aggregate mixture can lower the flash point and increase the penetration significantly.