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Abstract
Gravel lateritic soils are intensively used in road geotechnical engineering. This material is largely representative of engineering soil all around the tropical African Countries [1,2]. Gravel lateritic soils from parts of Burkina Faso and Senegal (West Africa) are used to determine the evolution of the geotechnical parameters from one to ten cycles of modified Proctor compaction. This test procedure is non-common for geotechnical purposes and it was found suitable and finally adopted to describe how these problematic soils behave when submitted to a multi-cyclic set of Modified Proctor compactions (OPM) [3,4]. On another hand, we propose a correlation between the traffic and the cycles of compaction considered as the repeated load. From that, this work shows the generation of active fine particles, the decrease of the CBR index and also the mechanical characteristics (mainly the Young Modulus, E) that contribute at least to the main deformation of the road structure.
Highlights
This paper is primarily intended to demonstrate that under unpredicted traffic and repeated loading, properties of gravel lateritic soils used as pavement layer can significantly change
This work shows the generation of active fine particles, the decrease of the CBR index and the mechanical characteristics that contribute at least to the main deformation of the road structure
According to [5,6,7,8,9,10], gravel lateritic soils are very sensitive to an exceptional variation of stresses under which they are subjected in a pavement structural fill
Summary
This paper is primarily intended to demonstrate that under unpredicted traffic and repeated loading, properties of gravel lateritic soils used as pavement layer can significantly change. It is expected that most of the physical and mechanical properties of gravel lateritic soils evolves during the design life. It is necessary to perform usual characterization tests on these kinds of materials by studying the evolution of their main properties under traffic such as gradation, plasticity, CBR (Californian Bearing ration), Los Angeles loss, Shear strength (UCT), etc. The first cycle of OPM compaction (cycle 1) corresponds to the specifications that are led to the initial design of pavement: Compaction at the Optimum Modified Proctor (OPM) and determination of the initial CBR value of the material that will have to support traffic. Determination during the same initial state of all physical and mechanical characteristics of materials, as reference values such as gradation, Atterberg limits, CBR, Los Angeles loss, Shear strength as Unconfined Compression Test characteristics (UCT), etc. Perform multi-cyclic compaction procedure to determine soil characteristics at each cycle of compaction
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