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Geomechanics and Engineering
  Volume 14, Number 6, April30 2018 , pages 533-544

Evaluation of strength properties of cement stabilized sand mixed with EPS beads and fly ash
Reza Jamshidi Chenari, Behzad Fatahi, Ali Ghorbani and Mohsen Nasiri Alamoti

    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.
Key Words
    sand; EPS; fly ash; cement; unconfined compression strength; California bearing ratio; direct shear test
Reza Jamshidi Chenari, Ali Ghorbani and Mohsen Nasiri Alamoti: Faculty of Engineering, University of Guilan, Rasht, Guilan, Iran

Behzad Fatahi:School of Civil and Environmental Engineering, Faculty of Engineering and Information Technology, University of Technology, Sydney (UTS), City Campus PO Box 123 Broadway NSW 2007, Australia

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