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Cairo University (2011)

Studying the Effect of Hot Climate Environmental Conditions on overlay Thickness of Asphalt Pavements

Fouad Salem El-Qahwagy

Titre : Studying the Effect of Hot Climate Environmental Conditions on overlay Thickness of Asphalt Pavements

دراسة تأثير الظروف البيئية في المناطق الحارة على سمك طبقة التغطية للرصف الإسفلتي

Auteur : Fouad Salem El-Qahwagy

Etablissement de soutenance : Cairo University

Grade : Master of Science (MS) 2011

Résumé
The main objectives of this research are studying the effect of hot climate environmental conditions on overlay thickness of asphalt pavements. In addition, The research aims at determining the temperatures in both winter and summer seasons for the different layers of the asphalt pavement at various depth. In order to meet the these goals, various techniques were applied laboratory tests, including field measurements, and analytical using software program, An experimental and analytical approach was implemented to carry out this investigation. Field measurements included the minimum and the average and the maximum pavement temperature during the various months of the year. Pavement temperature at various depths on summer days were observed. The experimental laboratory tests included aged asphalt penetration and marshal tests. The analytical approach involved the application of a multi -layer elastic system (shell) program that considers the temperature of the pavement layers and the asphalt mix properties. Results of the analysis indicated that the pavement temperature in summer is about 2.5 times the pavement temperature in winter. while the air temperature in summer exceeds four time the air temperature in winter. In summer season the pavement temperature is higher than the air temperature by about(20-25c ?),In winter season the pavement temperature is higher than air temperature by about (10-15c ?),The average pavement temperature in summer is about (3) times the pavement temperature in winter, the overlay thickness increases by70% if the pavement temperature increases by 30% this means that the pavement temperature is a critical factor on determining the overlay thickness, An increases of 40% in the thickness of the existing asphalt layer can decreases the overlay thickness by about 40% , The increases in the thickness of base course by 60% can decreases the overlay thickness 70%, The calculated overlay thickness increases when summer temperature conditions are considered . results also indicated that the overlay thickness reaches about 14cm if the air temperature35c. It was found that the calculated pavement temperature through the multilayer program are close to the measured temperature the field. The researcher summarized some recommendations have to be considered as following : Reconsidering the specifications of making asphalt mixture for hot dry areas, using asphalt which is less affected by pavement thermal variation in these areas, and improving the performance of the asphalt binding material by adding polymer or rubber or other conditioners to resist the prevailing environmental conditions in these areas. The study concluded that the pavement temperatures are directly related to major climate factors of air temperature and solar radiation and well vary greatly with depth, and the occurrence of the cracks appeared in the pavement is due to asphalt binding material aging as a result of asphalt pavement exposure to harsh climate represented in the big variation of temperatures and the severe dry weather. ?

Mots Clés : Hot climate, Overlay thickness of asphalt pavements

Présentation

Page publiée le 12 avril 2020