n Journal of the South African Institution of Civil Engineering = Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese - Towards a mechanistic structural design procedure for emulsion-treated base layers : technical paper




Existing guidelines on the use of emulsion-treated materials do not provide the necessary information for mechanistic analysis and design, and the structural design of these materials is mainly based on the experience of practitioners. Recent laboratory and heavy vehicle simulator testing provide some insight into the behaviour of emulsion-treated materials which has led to the development of interim transfer functions that may be used in a mechanistic analysis. Emulsion-treated materials behave in two phases, a pre-cracked and postcracked phase. In the pre-cracked phase, the material has a stiffness that is similar to that of lightly cemented material, while in the post-cracked phase it has a stiffness that is comparable to that of the untreated material. During the precracked phase the material will behave similarly to a lightly cemented material and will fail in fatigue. In the second phase the material will behave similarly to a granular material with a reduced resistance to permanent deformation. This paper describes a mechanistic design procedure for the structural design and analysis of emulsion-treated materials, based on the principles of the South African Mechanistic Pavement Design Procedure. An interim design catalogue based on these principles was developed and is also presented.


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