Effect of Organic Soil Acidity on the Properties of Iraqi Soil

  • Abdulaziz Al-Kifaae University of Al-Nahrain/College of Engineering/Civil Engineering dept., prof. Dr., Iraq
  • Nada Hisham Aayed University of Al-Nahrain/College of Engineering/Civil Engineering dept., prof. Dr., Iraq
Keywords: Organic Soil, Hydrated Lime, Leaching, Acidity.

Abstract

There are many problems with the constructing over organic soils as the existence of these types of soils always produces geotechnical and engineering problems for regional development. The geotechnical properties of inorganic soil greatly differ from organic soils, which is known for its high water content, low shear strength, high compressibility, acidity and long-term settlement. In this paper, two soils are chosen according to its organic content and acidity content then physical and chemical properties is done to know them characteristics and leaching process is performed to reduce its acidity that affect the properties of it and study the change of leaching on these properties. Dry hydrated lime is added to the natural and leached soils depending on the optimum lime content to improve their performance. From the physical tests, shear strength tests and consolidation test it can be noticed that the soils are behave better after leaching as it reduced in plasticity index, compressibility, and swelling and increase in shear strength. Furthermore, the leached soils are needed less percentage of lime content to produce a pH of 12.4 and the stabilized leached organic soils are behave better than the stabilized natural soils.     

References

[1] H.L. Bohn, B.L. McNeal, and G.A. O’Connor. Soil chemistry. United States: John Wiley and
Sons, 2001, pp.155-171.
[2] S. Kazemian, A. Prasad, B. B. K. Huat, B. J. Bolouri, N. A. A. Farah, and A. M. Thamer. “Effect of Aggressive pH Media on Peat Treated by Cement and Sodium Silicate Grout”, J. Central South Univ. Technol., Vol 17, No. 3, pp. 309-318, 2011c.
[3] R. Brenner, P. Nutalaya, G. Chilingraian, and J. Robertston. “Engineering Geology of Soft Clay” in Soft Clay Engineering, 20, Brand and Brenner, Ed. New York: Elsevier Scientific Publishing Company, 1981, pp.205- 211.
[4] O. G. Ingles and J. B. Metcalf. Soil Stabilization Principles and Practice, New York: Wiley, 1972, pp.127- 132.
[5] k. Harichane, M. Ghrici, W. Khebizi, and H. Missoum. “Effect of the Combination of Lime and Natural Pozzolana on the Durability of Clayey Soils” EJGE, Vol. 15 Bund. L, PP.1194-1209, 2010.
[6] American Road Builders Association Subcommittee on Lime Stabilization. Lime-treated Soil Construction Manual Lime Stabilization and Lime Modification. United States: national lime Association lime the universal chemical, January 2004, pp. 4-10.
[7] ASTM D 422-63."Standard Test Method for Particle-Size Analysis of Soils" in Annual Book of ASTM Standards, Vol. 04.08, ASTM International, Ed. West Conshohocken, PA,USA, 2007,pp.1-8.
[8] ASTM D 4318-10."Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils" in Annual Book of ASTM Standards, Vol. 04.08, ASTM International, Ed. West Conshohocken, PA, USA, 2014, pp.1-16.
[9] ASTM D 698-12."Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort (12 400 ft-lbf/ft3 (600 kN-m/m3))" in Annual Book of ASTM Standards, Vol. 04.08, ASTM International, Ed. West Conshohocken, PA, USA, 2012, pp.1-13.
[10] ASTM D2974. "Standard Test Method for Moisture Content, Ash and Organic Matter of Peat and Other Organic Soils" in Annual Book of ASTM Standards. Vol. 04.08. ASTM International, Ed. West Conshohocken, PA, USA, 2006, pp. 33-37.
[11] ASTM D 4972-13."Standard Test Method for pH of Soils" in Annual Book of ASTM Standards, Vol. 04.08, ASTM International, Ed. West Conshohocken, PA, USA, 2013, pp.1-4.
[12] ASTM D 2166-13. "Standard Test Method for Unconfined Compressive Strength of Cohesive Soil" in Annual Book of ASTM Standards, Vol. 04.08. ASTM International, Ed. West Conshohocken, PA, USA, 2013, pp. 1-7.
[13] ASTM D 3080-11. "Standard test method for direct shear test of soils under consolidated drained conditions." in Annual Book of ASTM Standards, Vol. 04.08. ASTM International, Ed. West Conshohocken, PA, USA, 2013, pp. 1-9.
[14] ASTM D6276-99a. “Standard Test Method for Using pH to Estimate the Soil-Lime Proportion Requirement for Soil Stabilization.” in Annual Book of ASTM Standards, Vol. 04.08. ASTM International, Ed. West Conshohocken, PA, USA, 2006, pp.1-4.
[15] ASTM D 2435-80. "Standard Test Methods for One-Dimensional Consolidation Properties of Soils Using Incremental Loading" in Annual Book of ASTM Standards. Vol. 04.08. ASTM International, Ed. West Conshohocken, PA, USA, 2004, pp. 1–15.
[16] P.P. Raj. Ground improvement techniques. New Delhi: Laxmi Publications, 1999, pp.189-199.
[17] Z. H. Sadiq. ”Improvement of Engineering Properties of Model Organic Soils.” M.A.thesis, Al-Mustansiriya University, Iraq, 2015.
[18] M. R. Hausmann. Engineering Principles of Ground Modifications, New York: McGraw Hill Publishing Company, 1990, pp.308-315.
[19] M. H. Ghobadi, R. Babazadeh, and Y. Abdilor. ”Utilization of lime for Stabilizing Marly Soils and Investigating the Effect of pH Variations on shear Strength Parameters” Journal of Engineering Geology, Vol.8, No.1, pp. 1939-1962, Spring 2014.
[20] N. C. Brady. “Organisms of the Soil” in The Nature and Properties of Soils, 9th edition. New York: Macmillan publishing Company, 1984, pp.223-245.
[21] H. V. Fang.” Soil Stabilization and Grouting” in Foundation Engineering Handbook, 2nd edition, Vol. 2, New York: Springer Science and Business Media, 1991, pp. 337-344.
Published
2017-03-08
Section
Articles