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The Effect of Cementation by Lime on Collapsible Soils Behavior Using Suction Controlled Oedometer Device Case Study: Loess of Gorgan

Zabihi, Nina | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44450 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Haeri, Mohsen
  7. Abstract:
  8. Collapsible soils such as loess, which are naturally found unsaturated, are kind of problematic soils that undergo sudden and noticeable decrease in volume under increasing stress at constant moisture, increasing moisture at constant stress, or increase in both of them. This kind of soil can be found in some parts of Iran such as plain of Gorgan. To fulfill the main purpose of this study, evaluating the effect of cementation on collapse behavior of loess of Gorgan, some oedometer tests under controlled matric suction were performed on reconstituted samples without and with lime. The lime was added for stabilizing of the collapsible materials and the amount was chosen to be %3 by weight of the base materials (Based on previous works). All samples were tested under constant net vertical stress and varying matric suction. The results show that lime addition has a positive effect on removing collapse behavior of the soil. Moreover, lime addition changes the water retention behavior of the soil. In addition to the main purpose of this study, the effect of net vertical stress on the behavior of both groups of samples in unsaturated oeodmeter tests under varying matric suction were investigated. The results show that net vertical stress level significantly affects the volume change and water retention behavior of the uncemented reconstituted samples without while in stabilized samples this effect is much less. Moreover, by comparison of the experimental results of tests on uncemented samples with Wheeler et al. (2003) model, It was concluded that the model can predict the soil behavior under constant net vertical stress and varying suction only for low and high net vertical stresses, while in medium range of stresses the model is incapable of accurate and acceptable prediction
  9. Keywords:
  10. Collapsible Soils ; Loess Soil ; Reconstituted Samples ; Stabilized Sample ; Unsaturated Odometer Test

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