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    Effect of freezing and thawing on strength and permeability of lime-stabilized clays
    (SHARIF UNIV TECHNOLOGY, 2012) Yildiz, M.; Soganci, A. S.
    In this study, the effect of freezing and thawing on the strength and permeability of two clayey soils (high and low plasticity), which had been stabilized with lime, were investigated. Before and after stabilization, the permeability and strength of the specimens were determined with various freeze-thaw cycles. Results of this study indicated that for both clays, 6% lime addition increased the hydraulic conductivity of the specimens 1000 times. However, the hydraulic conductivity of clay with 6% lime increased 10-20 times after only 3 freeze-thaw cycles. The results of strength tests exhibited different trends. The strength of stabilized high plasticity clay increased approximately 15 times at the end of 28 day curing, whereas the strength of stabilized low plasticity clay increased about 3 times only. The strength of both stabilized clays decreased 10-15% at the end of the freeze-thaw cycles. (C) 2012 Sharif University of Technology. Production and hosting by Elsevier B.V. All rights reserved.
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    Improvement of the strength of soils which comprises granular pumice by injection of cement under low pressure
    (ELSEVIER SCIENCE BV, 2015) Yildiz, M.; Soganci, A. S.
    In this study, improvement of granular pumice soils strength by injection method in Nevsehir City (Turkey) was investigated. In the first phase of the study, the geotechnical properties of granular pumice soils were investigated. The specific density, dry unit weight and water absorption value increased with the decrease of grain size. Thus, it can be seen that the bearing capacity of pumice varies depending on the grain size. In the second level, changes in strength of unconfined compression of injected pumice samples were analysed. The samples taken from the field were prepared to 35, 65 and 85% density, relatively. Pressure of 100 kPa and water/cement ratio of 1.0 was applied to these test samples and the samples were allowed to be cured for a period of 7 and 28 days. The results of the study showed that injected pumice soil reached its maximum strength value with 35% relative density and reached its minimum value with 85% relative density. At the end of 28 days curing period, injected pumice soils prepared with 85% relative density have an equivalent strength to C8 concrete class, and grouted pumice soils prepared with 35% relative density have an equivalent strength to C12 concrete class. (C) 2015 Sharif University of Technology. All rights reserved.