Statistical and experimental assessment of a clayey soil treated by chemical stabilization

Document Type : Research Paper



This paper presents the results of an experimental program developed to investigate the effect of an additive agent branded CBRPLUS on the mechanical behavior of a forest soil with high plasticity. Various experiments consisting of Atterberg limits, standard compaction, California bearing ratio (CBR), swelling potential and swelling pressure were conducted on natural soil and soil stabilized with various percentages of CBRPLUS. The results indicated that the addition of this material (at the rate of 0.05%), significantly changes the physical and mechanical properties of rehabilitated soil, including, reduction of the liquid limit (at least 6%), plasticity index (at least 9%), swelling potential (at least 27%), and swelling pressure (at least 45%), and also increasing the bearing capacity of soil (at least 53%); hence, the improvement of soil properties is a function of mass percentage of CBRPLUS. Furthermore multiple regression models were developed for CBR, swelling potential and swelling pressure as a function of additive agent percentage, plasticity index and maximum dry unit weight with accuracy and a high degree of agreement between experimental and predicted values. In addition a sensitivity analysis was also performed to investigate the effect of various parameters on CBR, swelling potential and swelling pressure values.


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Abadjieva, T. (2001). Chemical stabilisation for low cost roads in Botswana. InFirst Africa T2 conference (pp. 409-414).
Abdullah, W. S., Alshibli, K. A., & Al-Zou'bi, M. S. (1999). Influence of pore water chemistry on the swelling behavior of compacted clays. Applied Clay Science15(5), 447-462.
Ahmed, A. (2012). Simplified regression model to predict the strength of reinforced sand with waste polystyrene plastic type. Geotechnical and Geological Engineering, 30(4), 963-973.
Al‐Bahar, S. (2005). Moisture effect on selected polymer‐based membranes used for waterproofing building basements. Polymer composites26(3), 276-286.
Ali, F. (2012). Stabilization of residual soils using liquid chemical. Electronic Journal of Geotechnical Engineering17.
Aydin, K., Gamze, B., & Utkan, M. (2010). In-situ modification of a road material using a special polymer. Scientific Research and Essays5(17), 2547-2555.
Con-Aid (Pty) Ltd, (1998). Consumer guidelines for the Con-Aid Super, CBR Plus and CBR classic for the construction of roads, Florida, RSA.
Estabragh, A. R., Beytolahpour, I., & Javadi, A. A. (2010). Effect of resin on the strength of soil-cement mixture. Journal of Materials in Civil Engineering23(7), 969-976.
Estabragh, A. R., Naseh, M., Beytolahpour, I., & Javadi, A. A. (2012). Strength of a clay soil and soil–cement mixture with resin. Proceedings of the ICE-Ground Improvement166(2), 108-114.
Fairbrother, S. (2011). Estimating forest road aggregate strength by measuring fundamental aggregate properties. 34th Council on Forest Engineering, Quebec, Canada.
Hu, W. J., Shang, Q. S., Liu, S. T., Zhao, Z. Z., Fan, Z. J., Gao, X. C., ... & Ou, Q. C. (2007). The Application Technology of Roadpacker Solidified Limestone Soil. In International Conference on Transportation Engineering 2007 (pp. 692-697). ASCE.
Inyang, H. I., Bae, S., Mbamalu, G., & Park, S. W. (2007). Aqueous polymer effects on volumetric swelling of Na-montmorillonite. Journal of materials in civil engineering19(1), 84-90.
Jones, E. E., Ajayi-Majebi, A., Grissom, W. A., Smith, L. S., & Jones, E. E. (1991). Epoxy-resin-based chemical stabilization of a fine, poorly graded soil system. Transportation Research Record, (1295).
Kavak, A., Bilgen, G., & Mutman, U. (2010). In-situ modification of a road material using a special polymer. Scientific Research and Essays5(7), 2547-2555.
Khatibi, M., Estabragh, A. R., Soltani, A. & Rafatjoo, H. (2014). Assessment of swelling behavior of randomly reinforced expansive soils using regression analysis. In Proceeding of 8th National conference on Civil Engineering, Babol, Iran. (In Farsi)
Liu, J., Shi, B., Jiang, H., Bae, S., & Huang, H. (2009). Improvement of water-stability of clay aggregates admixed with aqueous polymer soil stabilizers.Catena77(3), 175-179.
Moayed, R. Z., & Allahyari, F. (2012).Determination of Required Ion Exchange Solution for Stabilizing Clayey Soils with Various PI. In Proceedings of World Academy of Science, Engineering and Technology (No. 61). World Academy of Science, Engineering and Technology.
Ranjan, G., Vasan, R. M., & Charan, H. D. (1996). “Probabilistic analysis of randomly distributed fiber-reinforced soil”. Journal of Geotechnical Engineering, 122(6), 419-426.
Savage, P. F. (2001). Rural road betterment: consideration when using CBR plus and/or con-aid materials. In First Road Transportation Technology Transfer Conference in Africa. Tanzania (pp. 378-390).
Scholen, D. E. (1995). Stabilizer mechanisms in nonstandard stabilizers. InTransportation research board conference proceedings (No. 6).
Shirsavkar, S. S., & Koranne, S. S. (2010). Innovation in Road Construction Using Natural Polymer. Electronic Journal of Geotechnical Engineering15.
Sivakumar Babu, G. L., & Vasudevan, A. K. (2008). “Seepage velocity and piping resistance of coir fiber mixed soils”. Journal of irrigation and drainage engineering, 134(4), 485-492.
Soltani, A., Estabragh, A. R. & Khatibi, M. (2014). Regression-aided analysis of improving piping resistance using randomly distributed fibers. In Proceeding of 8th National conference on Civil Engineering, Babol, Iran. (In Farsi)
White, W. A. (1949). Atterberg plastic limits of clay minerals. Report of investigations no. 144.