Manufacture of High Softening Waxy Asphalt for Use in Road Paving

摘要

This research aims to manufacture a special type of high softening waxy asphalt of penetration grade 60/70 to be used as a suitable binder in production of a hot mix asphalt(HMA)consisting of low quality aggregate(high absorptive type).This type of aggregate is found in Egypt on a large scale,especially in Sharkia governate.To achieve this aim,crude microcrystalline wax,which is characterized by its high congealing point,kinematic viscosity,and its low penetration,was mixed with the normal penetration grade asphalt 60/70 in percentage ranging from 2 to 6% by weight.The resultant asphalt samples were found to have high softening point ranging from 58°C to 75°C and penetration values within the current specifications.The produced waxy asphalt samples were used in preparing the HMA using the high absorptive aggregate.The mixes were evaluated using the Marshall method and tested for rutting resistance.The laboratory results show that the prepared mixes are suitable for use as a wearing or base course for the medium and low traffic roads.