Authors: Shalaw Abdullah Saleh 1 & Salar Khudhur Hussein2 & anjeena Jalal Khoshnaw3
1Civil Engineering Department, Tishk International University, Erbil, Iraq
2Civil Engineering Department, Technical College, Erbil Polytechnic University, Erbil, Iraq
3Road Construction Department, Erbil Technology College, Erbil Polytechnic University, Erbil, Iraq & Civil Engineering Department, Tishk International University, Erbil, Iraq
Abstract: Subgrade soil plays an important role in road structural design; therefore, poor subgrade soil may cause insufficient support for the pavement and may reduce its life. The poor properties subgrade soil should be replaced with a strong soil to improve the pavements properties and this cost a lot. Considering that, improving the poor subgrade soil properties by mixing it with different additive materials in site and stabilize it may be a better solution. This study was carried out to improve sample subgrade soil properties by stabilizing it using three different additive materials with different properties and quantities. For this purpose (ordinary portland cement), (limestone powder) and (fly ash) with percentages of (3%, 6% and 10%) were utilized. The modified mixture test results of (proctor test), Unconfined Compression Strength (UCS) and California Bearing Ratio (CBR test) showed that stabilization of the subgrade soil using different percentages of those additives improved the mechanical properties of the subgrade soil. Utilizing the above additive percentages, the CBR values improved from (5.25%) to (44.3%, 71%, 102.5%) while cement was utilized and to (8.75%, 9%, 10.2%) when fly ash was utilized and to (9.95%, 10.94%, 12.6%) with lime used.
Keywords: Soil Stabilization, Ordinary Portland Cement, Fly Ash, CBR, Limestone Powder, Water Content, Additives
Afolayan, O. D. (2017). Evaluation of the Effect of Lime and Cement on the Engineering Properties of Selected Soil in a University in Southwestern Nigeria. Reactions, 6, 12.
Arora, S., & Aydilek, A. H. (2005). Class F fly-ash-amended soils as highway base materials. Journal of Materials in Civil Engineering, 17(6), 640-649.
Balkis, A., & Macid, S. (2019). Effect of cement amount on CBR values of different soil. Avrupa Bilim ve Teknoloji Dergisi (16), 809-815.
de Paiva, S. C., de Assis Lima, M. A., de Vasconcelos Xavier Ferreira, M. d. G., & de Melo Ferreira, S. R. (2016). Geotechnical properties of a lime-treated expansive soil. Materia-Rio De Janeiro, 21(2), 437-449.
Gupta, A., Saxena, V., Saxena, A., Salman, M., & Kumar, A. (2017). Review Paper on Soil Stabilization by Terrazyme. International Journal of Research in Engineering and Technology, 7(4), 54-57.
Kumar, J. S., & Janewoo, U. (2016). Stabilization of expansive soil with cement kiln dust and RBI grade 81 at subgrade level. Geotechnical and Geological Engineering, 34(4), 1037-1046.
Kumar, P., Mehendiratta, H., & Rokade, S. (2005). Use of reinforced fly ash in highway embankments. Highway Research Bulletin, IRC, No-73, 1-13.
Malekzadeh, M., & Bilsel, H. (2014). Use of posidonia oceanica ash in stabilization of expansive soils. Marine Georesources & Geotechnology, 32(2), 179-186.
Misra, A. (1998). Stabilization characteristics of clays using class C fly ash. Transportation Research Record, 1611(1), 46-54.
Okonkwo, V., & Nwokike, V. (2015). Soil-cement stabilization for road pavement using soils obtained from Agu-Awka in Anambra State. Methods, 2(10).
Patel, M. A., & Patel, H. (2012). A review on effects of stabilizing agents for stabilization of weak soil. Civil and Environmental Research, 2(6), 1-7.
Pundir, V. S., & Prakash, V. (2015). Effect of soil stabilizers on the structural design of flexible pavements. J. Adv. Appl. Sci. Res, 6(8), 134-147.
Rajoria, V., & Kaur, S. (2014). A review on stabilization of soil using bio-enzyme. International Journal of Research in Engineering and Technology, 3(01), 75-78.
SP-89, I. (2010). Guidelines for soil and granular material stabilization using cement, lime and flyash.
Thyagaraj, T., Rao, S. M., Sai Suresh, P., & Salini, U. (2012). Laboratory studies on stabilization of an expansive soil by lime precipitation technique. Journal of Materials in Civil Engineering, 24(8), 1067-1075.
Zha, F., Liu, S., Du, Y., & Cui, K. (2008). Behavior of expansive soils stabilized with fly ash. Natural Hazards, 47(3), 509-523.