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University of Novi Sad (2015)

Research of the relevant temperatures for the design of pavement constructions on the desert roads in Libya

Salem-Hassan, Awadat

Titre : Research of the relevant temperatures for the design of pavement constructions on the desert roads in Libya

Истраживање меродавних температура за пројектовање коловозних конструкција пустињских путева у Либији

Auteur : Salem-Hassan, Awadat

Université de soutenance  : University of Novi Sad,

Grade : Doctor of Philosophy, Civil Engineering 2015

Résumé
Asphalt pavements form an important, integral part of any transportation system. The structural capacity of the hot mix asphalt concrete layers depends on many factors including its temperature. Moreover, temperature can be a major contributor to several types of distress. Therefore, temperature is a significant factor that affects the performance and life span of a pavement. The Libyan road network expanded at a phenomenal pace from approximately 10,000 km of paved roads in 1980, to more than 34,000 km in 2010. The study area is located on the southern of Libya at latitude between (24°17’N) and (30°11’N) in the desert of Libya. With the recent SHRP and LTTP research findings, it was necessary to investigate the applicability of the models developed from these research studies to the study area region’s environmental conditions and more generally to the rest Libya desert reigns. This research presents the investigations undertaken to develop models to predict high and low asphalt pavement temperatures in study area regions. A pavement monitoring station was set-up at the regions to monitor air, pavement temperatures in different depth, wind speed and solar radiation. Data were collected for 365 days. Daily minimum and maximum temperatures were recorded. A regression analysis was used to develop the minimum and maximum pavement temperature models, using air temperature, wind speed and solar radiation. This research presents a new model for predicting maximum and minimum of pavement layers temperature based on data collected by installed pavement monitoring station. The study area was divided into different ‘’performance grade zones’’ – zones with different extreme temperatures for bitumen ‘’PG’’ gradation - on the basis of previous 10 years temperature data collected from 10 weather stations. Also a temperature and ‘’PG’’ zoning map has been proposed to be implemented in Libya desert area.

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