Viscoelastic Properties of Bentonite Pastes

GOTOH Rempei, HANAI Tetsuya, AIDA Hiroshi

doi:10.2472/jsms1952.11.285

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Other Title

ベントナイト・ペーストの粘弾性
ベントナイトペーストノネンダンセイ

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Description

Viscoelastic properties of several kinds of bentonite pastes were measured under constant shearing stresses by the use of a cone-and-plate type viscometer. It was found that the paste had two threshold values of shearing stress which were named“lower limit”and“upper limit, ” and that the viscoelastic behavior appeared markedly between these two limits. Below the lower limit of stress no deformation was observed. The bentonite in swelling liquids showed the viscoelastic behavior is different from that in non-swelling liquids. The upper limit was assumed to be a value above which local breakdown of the structure of paste occurs. This upper limit was compared with the critical value obtained from a uniaxial compression test and that from a direct shear test used in soil mechanics. The upper limit σ₂^* was found to be related to the shear fracture, and was experssed experimentally by the following equation:<br>σ₂^*=A·exp (k·c)<br>where c is the concentration of bentonite and A and k are constants. σ₂^* takes a higher value in swelling liquids than in non-swelling liquids.

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