Individual clay particles have a tendency to contact each other and to form the microaggregates. If supposed that the micro-aggregates are composed of N clay plateletswhich are aligned in parallel with each other and are arranged at the same distance on a plane, thenwe can analyze the response of clay to the sinusoidal force, and consequently, obtained the theoretical visco-elasticity of Na, Ca-Montmorillonite in the paste. In this report, the micro-aggregate is characterized by certain

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... rs, for instance, the number of clay platelets contained in N and macro-porosity i. e. the ratio of tho inter-aggregate pore to total volume.