Abstract
Shear strength of the asphalt mixture (Marshall Stability) decreases as the percentage of rounded particles increases, which makes the mixture more susceptible to Permanent Deformation. According to SORB[1] specifications revised 2004 (R9), for prepare bitumen base layer for Hawler- Perda Highway project (new direction), the max. nominal size, (25.4 mm) of aggregate at three different crushed boulders levels: 0% (all was rounded), 50%, and 100% (more than one fracture face), added to Two different asphalt penetration grade types (40-50), and (60-70) were used to prepare the specimens. Specimens were prepared a total of 108 specimens for performance evaluation tests. It has been shown that Crushed boulders mixtures have marshall stiffness value more than 250% (100% crushing), increase VMA (voids in mineral aggregate) more than 130%, and to increase the resistance of moisture damage 135% in comparison with rounded mixtures respectively.
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