Abstract : The structural shrinkage model (model MRS) was applied to the shrinkage curve of undistributed soil samples which were collected from a soil sequence in Ivory Coast. The micro-pore volume which was calculated with the model MRS at the shrinkage limits is consistent with the pore volume of the clayey phase which was measured by mercury porosimetry. Then, the shrinkage curve of the clayey phase was calculated; it showed high variation of the properties for the studied soils