Measurement of the viscoelastic properties of water-saturated clay sediments.
Cohen, Steven Robert
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The complex shear modulus of both kaolin-water and bentonite-water mixtures has been determined in the laboratory. The method involved measuring the reaction on a torsional elastic wave propagated down a metal rod when the rod was immersed in sediment. Observations were made over the frequency range two to forty-three kHz. Dispersed sediments behaved like Newtonian liquids. Undispersed sediments, however, were viscoelastic in character, and their shear moduli exhibited no dependence on frequency. For undispersed kaolin mixtures, a typical result is (21.6 + i 1.2) x 1,000 dynes per square centimeter at 32 percent concentration. In bentonite, a modulus of (4.6 + i 2.0) x 10,000 dynes per square centimeter at 19 percent concentration is representative.
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