Number of design gyrations for 100 mm compacted asphalt mixtures modi-fied with polypropylene
There is not a standard accepted by the highway authorities on the compaction procedures of 100 mm diameter gyratory compactor specimens. First of all the modification of reference bitumen with polypropylene fibers at different temperature and modification levels was studied on a rotational viscosity basis. Then the optimal modification amount of 5.5‰ of polypropylene fiber by aggregate weight was utilised. Acting standards for mixture design are offering that the maximum aggregate size should be 2.54 cm in the surface courses in many countries. Utilisation of 150 mm mould sizes introduces an important amount of mechanical disturbance during coring process of 100 mm diameter specimens out of them. Physical and mechanical tests have been carried out on the specimens prepared by changing the main testing parameter of gyration number from 30 to 70. The design gyration number of polypropylene fiber reinforced dense bituminous mixtures has been determined as 33 under medium traffic conditions.
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