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Relationship between Clay Content, Clay Type, and Shrinkage Properties of Soil Samples

^a Lab. of Soil Science, Swiss Federal Institute for Technology, EPFL-ENAC-ISTE, 1015 Lausanne, Switzerland
^b INRA, rue Fernand Christ, 02000 Laon, France
^c Institut National de la Recherche Agronomique, Route de StCyr, 78026 Versailles Cedex, France

View larger version (12K): [in a new window]   Fig. 1. The soil shrinkage curve and transition points according to the exponential model (Braudeau et al., 1999). A, B, C, and D are transition points between linear and exponential phases, they are defined as the shrinkage limit point, the air entry point, the limit of macroporosity and the maximum swelling point, respectively. Dashed line is the saturation line or load line.

View larger version (16K): [in a new window]   Fig. 2. Experimental device used to measure the shrinkage and retention curves.

View larger version (38K): [in a new window]   Fig. 3. Shrinkage and retention curves of (a) a sample from Set 1 with 29.4% clay content and (b) a sample from Set 2 with 22.6% clay content.

View larger version (19K): [in a new window]   Fig. 4. Measured shrinkage curves of Sets (a) 1 and (b) 2.

View larger version (24K): [in a new window]   Fig. 5. Soil shrinkage curve measured and fitted with the exponential model for (a) a sample of Set 1 with 29.4% clay content and for (b) a sample of Set 2 with 22.6% clay content.

View larger version (35K): [in a new window]   Fig. 6. Slope of the shrinkage curve as a function of maximum equivalent radius of saturated pore and Point D fitted with the exponential model for Sets (a) 1 and (b) 2.

View larger version (32K): [in a new window]   Fig. 7. Retention curves of the micropore specific volume for (a) Set 1 and (b) Set 2.

View larger version (21K): [in a new window]   Fig. 8. Micropore specific volume at the transition points fitted with the exponential model as a function of clay content for (a) Set 1 and (b) Set 2.

View larger version (23K): [in a new window]   Fig. 9. Micropore specific volume at Points A and D fitted with the exponential model as a function of (a) clay content for Senegal soil samples and (b) Casamance soil samples.

View larger version (24K): [in a new window]   Fig. 10. Shrinking capacity of samples from Sets 1 and 2 and of undisturbed samples from Senegal and Casamance.