The main objective of this study is to utilize a class F fly ash as base material in road pavements where high volumes of this material may be used. Since fly ash does not manifest desirable engineering properties for this purpose, it was decided to stabilize the material with cement and lime separately. Fly ash may be utilized with or without aggregate in a pavement base or subbase. It should be noted that, in this research only aggregate-free stabilized mixtures were used. After performing geotechnical and mechanical tests, it was found that cement stabilization is superior than lime stabilization and decided to focus on cement stabilized material. Of the tests performed were standard proctor, Texas triaxial, resonance frequency, ultrasonic pulse velocity. Result of some of these tests gave the fundamental properties of the cement stabilised material in order to analyse the pavement structure. With the help of an accelerated full scale road test data which gave the fatigue performance of cement stabilised fly ash, an analytical pavement design procedure was performed to obtain the required layer thickness for different design lives.