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Effect of Humic Acid on Physical and Engineering Properties of Lime-Treated Organic Clay

Authors: N. Z. Mohd Yunus, D. Wanatowski, L. R. Stace


The present work deals with the stabilisation of organic clay using hydrated lime. Artificial organic clays were prepared by adding kaolin and different humic acid contents. Results given by physical testing show that the presence of humic acid has a drawback effect on the untreated organic clay. The decrease in specific gravity value was accompanied by a decrease in dry density and plasticity of clay at higher humic acid contents. Significant increase in shear strength at 7 days of curing period is observed in the lime-treated samples up to 5% lime content. However shear strength of lime-treated organic clay decreases at longer curing periods. The results given by laboratory testing is further verified by microstructure analysis. Based on the results obtained in this study, it can be concluded that the presence of more than 1.5% humic acid reduces significantly the efficiency of lime stabilization in organic clays.

Keywords: lime, Humic Acid , Kaolin, organic clay

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[1] ASTM, Standard D2487, "Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System)," Annual Book of ASTM Standards, Vol. 04.08, ASTM International, West Conshohocken, PA, pp. 249-260, 2004.
[2] H. Chen, and Q. Wang, "The behaviour of organic matter in the process of soft soil stabilization using cement," Bulletin Eng. Geol. Env., vol. 65, no. 4, pp. 445-448, 2006.
[3] B. Huat, S. Maail, and T. Ahmed Mohamed, "Effect of chemical admixtures on the engineering properties of tropical peat soils," American J. App. Sciences, vol. 2, no. 7, pp. 1113-1120, 2005.
[4] D.-H. Chen, Z. Si, and M. Saribudak, "Roadway Heaving Caused by High Organic Matter," J. Perf. Const. Facilities, vol. 23, no. 2, pp. 100- 108, 2009.
[5] W. Zhu, C. F. Chiu, C. L. Zhang, and K. L. Zeng, (2009). "Effect of humic acid on the behaviour of solidified dredged material," Can. Geot. J., vol. 46, no. 9, pp. 1093-1099, 2009.
[6] K. E. Clare, and P. T. Sherwood, "Further studies on the effect of organic matter on the setting of soil-cement mixtures," J. App. Chem., vol. 6, no. 8, pp. 317-324, 1956.
[7] K. Onitsuka, C. Modmoltin, M. Kouno, and T. Negami (2002). "The effect of humic acid on lime stabilized Ariake Clay," in Proc. 12th Int. Offshore and Polar Eng. Conf., Kitakyushu, Japan, pp. 577-583, 2002.
[8] K. Onitsuka, C. Modmoltin, M. Kouno, and T. Negami, "Effect of organic matter on lime and cement stabilized Ariake clays," Proc. Jap. Soc. Civ. Eng., No. 729, pp. 1-13, 2003.
[9] S. Koslanant, K. Onitsuka, and T. Negami, (2006). "Influence of salt additive in lime stabilization of organic clay," Geot. Eng. J., vol. 37, pp. 95-101, 2006.
[10] P. Harris, O. Harvey, S. Sebesta, S. R. Chikyala, A. Puppala, and S. Saride, "Mitigating the effects of organics in stabilized soil," Technical Report No. 0-5540-1, Texas Transportation Institute, USA, 2009.
[11] M. A. Sakr, and M. A. Shahin, "Utilization of lime for stabilizing soft clay soil of high organic content," Geot. Geol. Eng., vol. 27, pp. 105- 113, 2009.
[12] ASTM, Standard D5102-96, "Standard Test Method for Unconfined Compressive Strength of Compacted Soil-Lime Mixtures," Annual Book of ASTM Standards, Vol. 04.08, ASTM International, West Conshohocken, PA, pp. 1073-1078, 2004.
[13] British Standard 1377, "Methods of test for soils for civil engineering purposes," British Standard Institution, London, 1990.
[14] H. Ahnberg, "Effects of back pressure and strain rate used in triaxial testing of stabilized organic soils and clays," Geot. Test. J., vol. 27, no. 3, pp. 250-259, 2004.
[15] A. J. Puppala, S. P. Pokala, N. Intharasomba, and R. Williammee, "Effects of organic matter on physical, strength, and volume change properties of compost amended expansive clay," J. Geot. Geoen. Eng., vol. 133, no. 11, pp. 1449-1461, 2007.
[16] H. Ahnberg, S.-E. Johansson, H. Pihl, and T. Carlsson, "Stabilising effects of different binders in some Swedish soils," Ground Improvement, vol. 7, no. 1, pp. 9-23, 2003.
[17] British Standard 1924-2, "Stabilized materials for civil engineering purposes. Part 2: Methods of test for cement-stabilized and limestabilized materials," British Standard Institution, London, 1990.
[18] F.G. Bell, "Lime stabilization of clay minerals and soils," Eng. Geol., vol. 42, no. 4, pp. 223-237, 1996.
[19] R. James, A. H. M. Kamruzzaman, A. Haque, and A. Wilkinson, (2008). "Behaviour of lime-slag-treated clay," Ground Improvement, vol. 161, no. 4, pp. 207-216, 2008.