EVALUATING FACTORS INFLUENCING ASPHALT ROAD CONSTRUCTION QUALITY IN HIGH TEMPERATURE CONDITION (CASE STUDY)

Libya use a volumetric analysis in designing asphalt mixtures, which can also be upgraded in hot weather. However, the condition of some roads was further down than the required level. Rutting is one of the major defects that occur in asphalt pavements in the southern desert of Libya and severely influence the drive-ability. A questionnaire surveys and laboratory experiments were performed for a few mixes under representative temperature and traffic load. In laboratory, rutting test conducted on two different asphalt mixtures. The first mix used an asphalt binder B (60/70) at optimum bitumen content, another mixture developed using the Superpave design procedure with the same materials and performance asphalt binder grade PG (70-10). The questionnaire survey was distributed to 55 engineers and specialists in the field. The interview was conducted to a few others and the factors that leading to poor performance of asphalt roads were listed. Considering and improving of these factors will play an important role to improve the pavement performances, longer service life and lower maintenance costs. Asphalt concrete pavements (ACP) should use asphalt binder which is less affected by pavement temperature change and traffic load. The properties of the mixture, in turn, affect the pavement performance. Keywords - asphalt mixtures, consistency, performance, (PG), construction.