Shear Resistance of Soils Improved with Tannins of Néré Pod

The rupture of structures made with soil occurs in shearing when the solicitation is higher than the shear resistance. To improve the shear resistance of these structures, soils are often stabilized with classic hydraulic binders. This present study concerns the characterization of shear parameters (cohesion and internal angle of friction) of a clay sand with low plasticity stabilized with a vegetable binder which is the Nere pod. The rate of the binder varies from 0 to 8% of the total weight of the soil. The results show that the shear resistance and the cohesion increase with the rate of the binder while the internal angle of friction decreases.