Mechanistic design of foamed bitumen stabilised pavement bases

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Foamed bitumen stabilised (FBS) materials as non-continuously bound pavement layers are being increasingly used globally in both new road pavement base construction and rehabilitation of degraded pavements. However, the essential research on testing and design methods of FBS materials is still far from complete. In current pavement design practice, the laboratory-derived fatigue criterion of asphalt is used directly for FBS materials. This paper critically discusses the limitations in current pavement design and test methods and proposes a detailed bottom-up study for the characterisation of the flexural fatigue behaviour of FBS materials under both laboratory and field conditions. The numerical results obtained from Circly computer program revealed that the critical pavement response under standard axle loading is below the inner wheel of the standard axle along the vehicle travel direction. The analysis of numerical results showed that the level of interaction between the axles of various axle configurations increases with increasing FBS base layer thickness. Moreover, the ratio of the maximum compressive stress divided by the maximum tensile stress (R) at bottom of the FBS base under standard axle loading was determined to be less than 10% for all the FBS base layer thicknesses employed in this study.

Original languageEnglish
Title of host publicationRecent Developments in Pavement Design, Modeling and Performance - Proceedings of the 2nd GeoMEast International Congress and Exhibition on Sustainable Civil Infrastructures, Egypt 2018 – The Official International Congress of the Soil-Structure Interaction Group in Egypt SSIGE
EditorsSherif El-Badawy, Ragaa Abd El-Hakim
Number of pages12
ISBN (Print)9783030019075
Publication statusPublished - 2019
EventGeoMEast International Congress and Exhibition on Sustainable Civil Infrastructures 2018 - Cairo, Egypt
Duration: 24 Nov 201828 Nov 2018
Conference number: 2nd (Proceedings)

Publication series

NameSustainable Civil Infrastructures
ISSN (Print)2366-3405
ISSN (Electronic)2366-3413


ConferenceGeoMEast International Congress and Exhibition on Sustainable Civil Infrastructures 2018
Abbreviated titleGeoMEast 2018
Internet address


  • Axle Configuration
  • Axle Load
  • Flexural Fatigue Performance
  • Pavement Base
  • Standard Axle

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