DOI: 10.11648/j.scif.20260204.12 ISSN: 3070-6289

Design of Flexible and Rigid Pavement Based on ERA Manual (2013) Empirical Method and Mechanistic Approaches: The Case of Study Dire Dawa – Harar

Habtamu Teferi
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Flexible pavements usually consist of a bituminous surface under laid with a layer of granular material and a layer of a suitable mixture of coarse and fine materials. Traffic loads are transferred by the wearing surface to the underlying supporting materials through the interlocking of aggregates, the frictional effect of granular materials, and cohesion of fine materials. Rigid highway pavements are normally constructed of Portland cement concrete and may or may not have a base course between the subgrade and the concrete surface. The traffic class of flexible pavement is T6, it has been derived (with a total of ESAs on the order of 8.89 million over the design period). From the table given on ERA, for that class of traffic, it is readily apparent that the use of the design charts in the catalog of structures. From types of rigid pavement the selection is CRCP design in ERA method design consideration. Because CRCP shall basically be considered only for rather high design traffic (>30msa) so, the ESAL values is 85.41*10 6 . They can also be included for less heavily trafficked schemes where the advantage of lower maintenance throughout the design life may be worthwhile. They are particularly suitable were settlement of the sub-soil is expected. For instance, for heavily traveled facilities in congested locations, the need to minimize the disruptions and hazard to traffic may dictate the selection of CRCP. The continuous reinforcement increases the resistances of slabs but the compressive strength remain limited and the slab is prone to expansion failure. It is thus preferable to cast CRCP slabs during the hottest time of the year to limit the potential of thermal expansion.

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