Geomechanics and Engineering

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Evaluation of strength properties of cement stabilized sand mixed with EPS beads and fly ash

  • Chenari, Reza Jamshidi (Faculty of Engineering, University of Guilan) ;
  • Fatahi, Behzad (School of Civil and Environmental Engineering, Faculty of Engineering and Information Technology, University of Technology, Sydney (UTS)) ;
  • Ghorbani, Ali (Faculty of Engineering, University of Guilan) ;
  • Alamoti, Mohsen Nasiri (Faculty of Engineering, University of Guilan)
  • Received : 2017.07.06
  • Accepted : 2017.10.19
  • Published : 2018.04.30
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Abstract

The importance of using materials cost effectively to enhance the strength and reduce the cost, and weight of earth fill materials in geotechnical engineering led researchers to seek for modifying the soil properties by adding proper additives. Lightweight fill materials made of soil, binder, water, and Expanded polystyrene (EPS) beads are increasingly being used in geotechnical practices. This paper primarily investigates the behavior of sandy soil, modified by EPS particles. Besides, the mechanical properties of blending sand, EPS and the binder material such as fly ash and cement were examined in different mixing ratios using a number of various laboratory studies including the Modified Standard Proctor (MSP) test, the Unconfined Compressive Strength (UCS) test, the California Bearing Ratio (CBR) test and the Direct Shear test (DST). According to the results, an increase of 0.1% of EPS results in a reduction of the density of the mixture for 10%, as well as making the mixture more ductile rather than brittle. Moreover, the compressive strength, CBR value and shear strength parameters of the mixture decreases by an increase of the EPS beads, a trend on the contrary to the increase of cement and fly ash content.

Keywords

References

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