Rutting of asphalt pavements in egyptian roads and methods of its prediction and evaluation

Pavement rutting is the progressive accumulation of permanent deformation in one or more layer of the pavementsystem under load repetition. The magnitude and rate of pavement rutting depends on the pavement structure, material characteristics, traffic loads and environmental conditions.This study is primarily concerned with developing a model for rutting prediction in asphalt pavements under different traffic and environmental conditions in Egypt, based on thewheel tracking test (WTT).To achieve this objective, the studylaboratory verification of the WTT results sites representing different link types conditions in Egypt. It also investigates mix composition and testing conditions performance in rutting.conducts field/ at sixteen test and pavement the effects of on the mixThe analysis of results indicates the importance of the WTT as one of the measures for evaluating the ruttingcharacteristics of asphalt mixes. A call is made for usingthe maximum WTT rates (CTR ), developed in this study, max as stability limits in designing asphalt paving mixes.This would ensure that the designed mixes will exhibit adequate resistance to rutting under actual trafficand environmental conditions. Another call is made for developing methods for mix design optimization with respectto rutting as well as other design criteria.