Contribution to the characterization and valuation of a mixture of clay and dune sand for road construction

In dry and hot regions like Morocco, the most expansive soils are clays or marl whose “normal” state is dry and dense.The problems created by these floors in the field of construction are mainly due to the swelling of the floors.We have chosen for this reason to focus our work on the swelling of clay soils which consists in evaluating the influence of the addition of dune sand and exploiting it in geotechnical studies, to stabilize and modify the physical-chemical characteristics and mechanical at different percentages of compressibility, swelling, and consolidation, through oedometric tests.Treated and untreated samples are compacted to the optimum water content (W Opt ) and maximum dry density (γ Dmax ). The results of the compressibility tests show that the reconsolidation stress as well as the consolidation of the treated samples is higher than that of the untreated sample, it was also found that the dune sand reduces the compressibility index (Cc), and swelling (Cg),It can be said that stabilization by dune sand significantly improves the mechanical characteristics of the clay studied. The exploitation of the materials studied and to present a clean and profitable alternative in the field of road construction.