Evaluation of collapse potential of silty sandy soil stabilized with microsilica, bentonite and rice husk ash

Authors

Abstract

Collapsible soil is defined as loose deposit with a metastable and porous structure and mostly is found in arid and deserted regions.The particles of soil in the unsaturated state are connected together by capillary tension and in the dry state by cementation such as clay and silt bond or by other cohesive material like calcium silicate. The cementation agent makes a relatively high apparent strength in this type of soils but it will collapse in wet condition due to weakening effect of moisture.As city of Semnan is located in a dry area with collapsible soil in some parts of its urban district. It is highly endangered by this natural phenomenon. Therefore further studies on recognition and developing method of dealing with this phenomenon is really important. This study investigated the effect of bentonite, microsilica and rice husk ash on soil volume change has been studied. Based on test results on stabilized samples, by adding microsilica up to 4% of total weight of soil sample will reduce collapse potential, but increasing percentage of microsilica will have opposite effect. In addition by adding a mixture of additives consists of fixed portion of 3% of microsilica and variation portion of bentonite as well as by adding rice husk ash the results show that collapse potential had been reduced continuously.

Keywords

References

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Journal of Modeling in Engineering
Volume 13, Issue 42
October 2015
Pages 87-101

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History

  • Receive Date: 28 January 2017
  • Revise Date: 16 September 2017
  • Accept Date: 28 January 2017

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