Conference Title: International Conference in Business,Technology and Innovation 2013
Conference Title: UBT Publications
Contributing Editos: Prof. Albert Qarri, Prof. Ibrahim Krasniqi, Krenare Pireva, Evelina Bazini, Nita Abrashi
Co-Organizers: Ardian Emini, Vlora Aliu, Betim Gashi, Xhemajl Mehmeti, Kushtrim Dragusha, Murat Retkoceri, Kaltrina Bunjaku, Leonita Braha
Start Date: 2013-11-01
End Date: 2013-11-02
Venue, City, Country: : Hotel Bleart , Durres , Albania

Paper Title

Modified SMA Design Mix for Motorway Wearing Course – Case Study Kosovo Motorway


Esat Gashi , Hajdar Sadiku


Stone Mastic Asphalt (SMA) mixtures rely on stone-to-stone contacts among particles to resist applied forces, and permanent deformation. Aggregates in SMA should resist degradation (fracture and abrasion) under high stresses at the contact points. For the Motorways, SMA stone grid must fulfil the Mineralogical-petro-graphic condition to be on rock of igneous and/or metamorphic origin but of silicate composition, specific weight and LA method on resistance to fragmentation. During the construction of the Kosovo motorway for wearing course was used the SMA as a asphalt layer providing longer lifetime to the road construction. During the Motorway construction the contractor was short of stone material with as specified in GTR material for wearing course, therefore it was compulsory to compose a new asphalt design mix with available rock in Kosovo. New quarry was explored in place called Golesh where stone extracted from this quarry have LA resistance on fragmentation lower than specifications allow for motorway. Specific weight of this stone is for 15% greater than ordinary stone used in laboratory design mix. For this specific stone were prepared special asphalt design mixtures with binder content 4.5% which was well below than typical SMA composition of 6.0 −7.0% binder. During the asphalt paving some bitumen patches were noticed due to the specific weight of the stone in design mix, therefore it has been reduced vibration during the asphalt compaction. In this paperwork we will present design mixes with stone used from golesh quarry and results gained in laboratory and on site.


SMA design mix, stone grid, structural design , bitumen content, quality assurance, quality control