Effect of slag and bentonite on shear strength parameters of sandy soil

  • Received : 2016.01.13
  • Accepted : 2017.11.14
  • Published : 2018.05.20


A series of direct shear tests were implemented on three different types of specimens (i.e., clean Perth sand, sand containing 10, 20 and 30% bentonite, sand containing 1, 3 and 5% slag, and sand containing 10, 20 and 30% bentonite with increasing percentages of added slag (1%, 3% and 5%). This paper focuses on the shear stress characteristics of clean sand and sand mixtures. The samples were tested under different three normal stresses (100, 150 and 200 kPa) and three curing periods of no curing time, 7 and 14 days. It was observed that the shear stresses of clean sand and mixtures were increased with increasing normal stresses. In addition, the use of slag has improved the shear strength of the sand-slag mixtures; the shear stresses rose from 128.642 kPa in the clean sand at normal stress of 200 kPa to 146.89 kPa, 154 kPa and 161.14 kPa when sand was mixed with 1%, 3% and 5% slag respectively and tested at the same normal stress. Internal friction angle increased from $32.74^{\circ}$ in the clean sand to $34.87^{\circ}$, $37.12^{\circ}$ and $39.4^{\circ}$ when sand was mixed with 1%, 3% and 5% slag respectively and tested at 100, 150, and 200 kPa normal stresses. The cohesion of sand-bentonite mixtures increased from 3.34 kPa in 10% bentonite to 22.9 kPa, 70.6 kPa when sand was mixed with 20% and 30% bentonite respectively. All the mixtures of clean sand, different bentonite and slag contents showed different behaviour; some mixtures exhibited shear stress more than clean sand whereas others showed less than clean sand. The internal friction angle increased, and cohesion decreased with increasing curing time.


sand;bentonite;slag;shear strength;shear strength parameters;direct shear test


  1. Sabbar, A.S., Chegenizadeh, A. and Nikraz, H. (2017a), "Experimental investigation on the shear strength parameters of sand-slag mixtures", J. Geotech. Geol. Eng., 11(3), 198-203.
  2. Sabbar, A.S., Chegenizadeh, A. and Nikraz, H. (2017b), "Static liquefaction of very loose sand-slag-bentonite mixtures", Soil. Found., 57(3), 341-356.
  3. Shooshpasha, I. and Shirvani, R.A. (2015), "Effect of cement stabilization on geotechnical properties of sandy soils". Geomech. Eng., 8(1), 17-31.
  4. Sivapullaiah, P.V., Sridharan, A. and Stalin, V.K. (2000), "Hydraulic conductivity of bentonite-sand mixtures", Can. Geotech. J., 37(2), 406-413.
  5. UNIMIN Australia Limited. (2009), Technical Data Sheet of Trubond Bentonite, .
  6. Veith, G. (2000), "Essay competition-green, ground and great: Soil stabilization with slag", Build. Res. Inform., 28(1), 70-72.
  7. Watabe, Y., Yamada, K. and Saitoh, K. (2011), "Hydraulic conductivity and compressibility of mixtures of Nagoya clay with sand or bentonite", Geotechnique, 61(3), 211-219.
  8. Yi, Y., Liska, M. and Al-Tabbaa, A. (2013), "Properties of two model soils stabilized with different blends and contents of GGBS, MgO, lime, and PC", J. Mater. Civ. Eng., 26(2), 267-274.
  9. Amsiejus, J., Dirgėlienė, N., Norkus, A. and Skuodis, S. (2014), "Comparison of sandy soil shear strength parameters obtained by various construction direct shear apparatuses", Arch. Civ. Mech. Eng., 14(2), 327-334.
  10. Bareither, C.A., Benson, C.H. and Edil, T.B. (2008), "Comparison of shear strength of sand backfills measured in small-scale and large-scale direct shear tests", Can. Geotech. J., 45(9), 1224-1236.
  11. BGC cement. (2013), Safety Data Sheet of Granulated Blast Furnace Slag, .
  12. Borgesson, L., Johannesson, L.E. and Gunnarsson, D. (2002), "Influence of soil structural in homogeneities on the behaviour of backfill materials based on mixtures of bentonite and crushed rock", Proceedings of the Workshop on Clay Microstructure and its Importance to Soil Behaviour, Lund, Sweden, October.
  13. Budhu, M. (2010), "Earth fissure formation from the mechanics of groundwater pumping", J. Geomech., 11(1), 1-11.
  14. Budihardjo, M.A., Chegenizadeh, A. and Nikraz, H. (2015), "Application of wood to sand-slag and its effect on soil strength", Proc. Eng., 102, 640-646.
  15. Chalermyanont, T. and Arrykul, S. (2005), "Compacted sandbentonite mixtures for hydraulic containment liners", Songklanakarin J. Sci. Technol., 27(2), 313-323.
  16. Chen, Y. and Meehan, C.L. (2011), "Undrained strength characteristics of compacted bentonite/sand mixtures", Proceedings of the Geo-Frontiers 2011 Conference, Dallas, Texas, U.S.A. March.
  17. Akgun, H., Kockar, M.K. and Akturk, O. (2006), "Evaluation of a compacted bentonite/sand seal for underground waste repository isolation", Environ. Geol., 50(3), 331-337.
  18. Allan, M. and Kukacka, L. (1995), "Blast furnace slag-modified grouts for in situ stabilization of chromium-contaminated soil", Waste Manage., 15(3), 193-202.
  19. Cho, W.J., Lee, J.O. and Kang, C.H. (2002), "A compilation and evaluation of thermal and mechanical properties of bentonitebased buffer materials for a high-level waste repository", Nucl. Eng. Technol., 34(1), 90-103.
  20. Das, B.M. and Sobhan, K. (2014), Principles of Geotechnical Engineering, Cengage Learning, Stamford, Connecticut, U.S.A.
  21. Dixon, D.A., Gray, M.N. and Thomas, A.W. (1985), "A study of the compaction properties of potential clay-sand buffer mixtures for use in nuclear fuel waste disposal", Eng. Geol., 21(3), pp.247-255.
  22. El Mohtar, C.S., Bobet, A., Drnevich, V.P., Johnston, C.T. and Santagata, M.C. (2014), "Pore pressure generation in sand with bentonite: From small strains to liquefaction", Geotechnique, 64(2), 108.
  23. Elkady, T.Y., Shaker, A.A. and Dhowain, A.W. (2014), "Shear strengths and volume changes of sand-attapulgite clay mixtures", Bull. Eng. Geol. Environ., 74(2), 595-609.
  24. Evans, J.C. (1993), Vertical Cut-Off Walls, in Geotechnical Practice for Waste Disposal, Springer, Boston, Massachusetts, U.S.A., 430-454.
  25. Fan, R.D., Du, Y.J., Liu, S.Y. and Chen, Z.B. (2014), "Compressibility and hydraulic conductivity of sand/claybentonite backfills", Proceedings of the Geo-Shanghai International Conference 2014, Shanghai, China, May.
  26. Ghazi, A.F. (2015), "Engineering characteristics of compacted sand-bentonite mixtures", M.Sc. Dissertation, Edith Cowan University, Perth, Australia.
  27. Gleason, M.H., Daniel, D.E. and Eykholt, G.R. (1997), "Calcium and sodium bentonite for hydraulic containment applications", J. Geotech. Geoenviron. Eng., 123(5), 438-445.
  28. Gueddouda, M.K., Lamara, M., Aboubaker, N. and Taibi, S. (2008), "Hydraulic conductivity and shear strength of dune sand-bentonite mixtures", Elec. J. Geotech. Eng., 13, 1-15.
  29. Head, K.H. and Epps, R.J. (2011), Manual of Soil Laboratory Testing Volume 2: Permeability, Shear Strength, and Compressibility Tests, Whittles Publishing, Dunbeath, U.K.
  30. Higgins, D. (2005), Soil Stabilisation with Ground Granulated Blastfurnace Slag, UK Cementitious Slag Makers Association (CSMA), London, U.K.
  31. Howell, J.L., Shackeford, C.D., Amer, N.H. and Stern, R.T. (1997), "Compaction of sand-processed clay soil mixtures", Geotech. Test. J., 20(4), 443-458.
  32. Kenney, T.C., Veen, W.V., Swallow, M.A. and Sungaila, M.A. (1992), "Hydraulic conductivity of compacted bentonite-sand mixtures", Can. Geotech. J., 29(3), 364-374.
  33. Komine, H. and Ogata, N. (1999), "Experimental study on swelling characteristics of sand bentonite mixtures for nuclear waste disposal", Soil. Found., 39(2), 83-97.
  34. Liu, J., Lv, P., Cui, Y. and Liu, J. (2014), "Experimental study on direct shear behavior of frozen soil-concrete interface", Cold Reg. Sci. Technol., 104, 1-6.
  35. Matsuda, H., Shinozaki, H., Ishikura, R. and Kitayama, N. (2008), "Application of granulated blast furnace slag to the earthquake resistant earth structure as a geo-material", Proceedings of the 14th World Conference on Earthquake Engineering, Beijing, China, October.
  36. Mishra, A.K., Ohtsubo, M., Li, L.Y. and Higashi, T. (2010), "Influence of the bentonite on the consolidation behaviour of soil-bentonite mixtures", Carbonate. Evaporite., 25(1), 43-49.
  37. Osano, S.N. (2009), "Direct shear box and ring shear test comparison: Why does internal angle of friction vary", ICASTOR J. Eng., 5(2), 77-93.
  38. Park, S.S., Choi, S.G. and Nam, I.H. (2014), "A study on cementation of sand using blast furnace slag and extreme microorganism", J. Kor. Geotech. Soc., 30(1), 93-101.
  39. Rabbani, P., Daghigh, Y., Atrechian, M.R., Karimi, M. and Tolooiyan, A. (2012), "The potential of lime and grand granulated blast furnace slag (GGBFS) mixture for stabilisation of desert silty sands", J. Civ. Eng. Res., 2(6), 108-119.
  40. Sabbar, A., Chegenizadeh, A. and Nikraz, H. (2016), "Review of the experimental studies of the cyclic behaviour of granular materials: Geotechnical and pavement engineering", Aust. Geomech. J., 51(2), 89-103.