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Geomechanics and Engineering
  Volume 22, Number 5, September10 2020 , pages 441-448

Fall-cone testing of different size/shape sands treated with a biopolymer
Ali Firat Cabalar and Suleyman Demir

    This paper presents a study on the undrained shear strength (su) of various sands treated with a biopolymer by employing an extensive series of laboratory fall-cone penetration values covered a range of about 15 mm to 25 mm. In the tests, two sizes (0.15 mm-0.30 mm, and 1.0 mm-2.0 mm) and shapes (rounded, angular) of sand grains, Xanthan gum (XG), and distilled water were used. The XG biopolymer in 0.0%, 1.0%, 2.0%, and 3.0% by dry weight were mixed separately with four different sands, and water. The tests results obtained at the same water content revealed an increase in the su values at different levels with an increase in the XG content. Treating the sands with the XG biopolymer addition was concluded to have a greater efficacy on finer and more angular grains than coarser and more rounded grains in the samples. Overall, the present study indicates that different amount of the XG biopolymer has an important potential to be utilized for increasing the su values of samples with various size/shape of sand grains and water content.
Key Words
    fall-cone; xanthan gum; sand; size; shape
Ali Firat Cabalar: Department of Civil Engineering, University of Gaziantep, Gaziantep 27310, Turkey

Suleyman Demir: Department of Civil Engineering, Kilis 7 Aralik University, Kilis 79000, Turkey

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