Abstract:

The number of studies on the thermal behavior of soils have increased because of increase in number and type of energy structures in last decades. The soils around energy structures must retain without any changes at their engineering properties against temperature changes or thermal cycles. Pumice is used for increasing strength of materials against high temperature. It is expected that when the pumice is added to the soil, it may increases the strength of the sand-bentonite mixtures under high temperatures. For that reason, 10% and 20% pumice were added to sand-bentonite mixtures and compaction, consolidation behaviors at room temperature were investigated. In addition, the shear strength behavior of 10% bentonite-sand mixtures in the presence of 10% and 20% pumice additive under room temperature and 80C was investigated. According to the results of the consolidation tests, the total vertical strain increased as the pumice content in the mixture increased. According to the results of direct shear test, it was observed that pumice additive under room temperature and 80C increased the internal friction angle of 10% bentonite-sand mixtures. Especially under high temperature (80C), the internal friction angle of the sample increased when 20% pumice additive was added.

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