Estimation of critical ratio of bentonite addition to tuff sand |
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Authors: | Shigeyoshi Imaizumi Masazumi Wataru Naoki Takahashi Yoichi Doi |
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Institution: | 1. Graduate School of Energy and Environmental Science, Utsunomiya University, Utsunomiya, Japan 2. Sumitomo Mitsui Construction Co. Ltd., 518-1 Komaki, Nagareyama, Chiba, 270-0132, Japan
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Abstract: | A design method was proposed to determine the critical ratio of bentonite addition, based on a macro void ratio that considers
the swelling property of bentonite. The critical ratio of bentonite addition was defined as the ratio corresponding to a macro
void ratio of zero. However, when lightweight soil such as tuff sand is mixed with bentonite, the estimated critical ratio
of bentonite addition is too high. Several tests on the water absorbing property of tuff sand and its permeability were conducted
to confirm the concept of a revised macro void ratio. The revised macro void ratio, which takes into account the swelling
of bentonite and the particle pores of lightweight soil, is much smaller than the former macro void ratio for a given ratio
of bentonite addition. The estimated critical ratio of bentonite addition to tuff sand that gives a revised macro void ratio
of zero is around 18% and is in good agreement with the ratio of bentonite addition beyond which the value of hydraulic conductivity
does not decrease markedly. |
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