THE CALCULATING THE NUMBER OF STRUCTURAL CONTACTS IN CLAY DISPERSE SOILS    

F. S. Karpenko*, K. N. Abrosimov**, O. V. Serebrova*

*Sergeev Institute of Environmental Geoscience, Russian Academy of Science, Ulanskii per., 13, bld. 2, Moscow, 101000 Russia 

**Dokuchaev Soil Science Institute, Pyzhevskii per. 7, bld. 2, Moscow, 119017 Russia

*E-mail: kafs08@bk.ru;
**E-mail: kv2@bk.ru

The paper considers important the issues of calculating the number of structural contacts in clay soils, which is an important physicochemical characteristic of their structure. The studies carried out by the computed X-ray tomography (X-ray mCT) proved the possibility of applying this method not only for analyzing clay microstructure, but also for direct calculation of the number of contacts between mineral particles. The research results permitted us to assess the number of contacts of various predominant types in the clay soil varieties and to obtain empirical dependences between the number of contacts in clays and their particle-size distribution. The obtained data correspond to the models of clay microstructures developed by V. N. Sokolov, i.e., the "bidisperse" model and the model of the "skewing playing card house".

Keywords: clay soils, structural contacts, type of contacts, number of contacts, structural composition, mCT, computed tomography

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