Collapsibility and Strength of Gypseous Soil Treated with Palm Fibers
Received: 30 June 2025 | Revised: 15 August 2025 | Accepted: 20 August 2025 | Online: 6 October 2025
Corresponding author: Lamyaa N. Snodi
Abstract
Collapsible soil is a type of soil that appears strong and stable in its dry state but loses stability when exposed to water, resulting in collapse. Such soil poses a major challenge in the field of geotechnical engineering. Gypseous soils are one type of collapsible soil; they are defined as soils containing a high percentage of gypsum (CaSO4.2H2O), which can make up a significant part of their mineral composition. These soils are found in arid and semi-arid regions, where the climatic conditions favor the gypsum formation due to the low rainfall and high evaporation rates caused by the high temperatures. Gypseous soils are highly soluble in water and have poor stability when used as a foundation for construction; therefore, they require special care and treatments to prevent building failures. In this study, the effect of adding palm fibers as an additive on the compressibility and strength of gypseous soil was examined. The soil used has a gypsum content of 56% and was collected from Tikrit City, Salah Aldeen Governorate, Iraq. Palm fibers were added to the soil at percentages of 0.1%, 0.3%, and 0.5% of the soil weight. Collapse and direct shear tests were conducted on both natural and treated samples. The results show a significant decrease in the Collapse Potential (CP) and a notable increase in the shear strength parameters, namely cohesion (c) and angle of internal friction (φ), for the treated soil. The improvement in CP reached 39.38% at 0.5% treatment. For the direct shear test, the increases in c and the angle of internal friction (φ) reached 52.78% and 18.57%, respectively, at 0.5% treatment.
Keywords:
Gypseous soil, palm fiber, collapse, collapse improvement ratio, soil strength, strength improvement ratioDownloads
References
S. F. A.-A. Highway and N. S. M. Al-Dulaimi, "Characteristics of Gypseous Soils Treated with Calcium Chloride Solution," Journal of Engineering, vol. 3, pp. 681–692, Sep. 2006.
M. K. Mohsen, Q. A. Al-Obaidi, and A. O. Asker, "Improving the Gypseous Soil Bearing Capacity Using Geotextile Reinforcement Under Dry Condition," in Geotechnical Engineering and Sustainable Construction, Singapore, 2022, pp. 3–13.
K. A. E. Al-Janabi, L. N. Snodi, and A. J. Zedan, "Ring Footing Bearing Capacity Erected on Dry Gypseous Soil," Tikrit Journal of Engineering Sciences, vol. 31, no. 3, Jul. 2024.
N. M. Toma and M. T. Al-Hadidi, "The effect of soaking and wetting on the properties of the gypsum soil treated with polyurethane," Association of Arab Universities Journal of Engineering Sciences, vol. 29, no. 2, pp. 01–08, Jun. 2022.
D. S. A. Khattab, I. M. Al-Kiki, and A. H. Al-Zubaydi, "Effect of Fibers on Some Engineering Properties of Cement and Lime Stabilized Soils," Eng. & Tech. Journa, vol. 29, no. 5, pp. 886–905, 2011.
A. S. Alamdari and R. Dabiri, "Effect of the Fibers Type on Improving the Bearing Capacity of Clayey Soils," International Journal on "Technical and Physical Problems of Engineering," vol. 9, no. 1, pp. 43–50, 2017.
L. N. Snodi, "Plastic materials waste for improvement gypseous soil," in Smart Geotechnics for Smart Societies, CRC Press, 2023.
A. A. Waleed, M. E. Selçuk, and M. K. Mohsen, "Investigation behavior of gypsum soil reinforced by geosynthetics supported square footing-an experimental study," IOP Conference Series: Earth and Environmental Science, vol. 1232, no. 1, Jun. 2023, Art. no. 012063.
R. F. Abaas, M. Y. Fattah, M. H. Naif, and M. Hafez, "Collapsible Gypseous Soil Stabilization by Calcium Carbide Residue and Sulfonic Acid," Sustainability, vol. 16, no. 22, Jan. 2024, Art. no. 9974.
H. W. Abdulwadood, "Wasted Plastic Polypropylene Fibers as Gypseous Soil Stabilizer," The Iraqi Geological Journal, vol. 58, no. 1B, pp. 231–244, Feb. 2025.
A. R. Mehsin, A. Mohammed, M. Al-Hadidi, and F. Ghrari, "Improvement of Expansive Soil by Using Fiber Glass Silica Fume Mixture," Kufa Journal of Engineering, vol. 16, no. 1, Feb. 2025.
R. P. Boruah, B. Mohanadhas, and J. Kamalanathan, "A comparative study of the shear strength of a poorly graded soil using Bacillus subtilis, vetiver fibre and bamboo fibre," Advances in Bamboo Science, vol. 11, May 2025, Art. no. 100146.
T. A. Rind, H. Karira, A. A. Jhatial, S. Sohu, and A. R. Sandhu, "Particle Crushing Effect on The Geotechnical Properties of Soil," Engineering, Technology & Applied Science Research, vol. 9, no. 3, pp. 4131–4135, Jun. 2019.
ASTM D5333-92 Standard Test Method for Measurement of Collapse Potential of Soils. USA: ASTM International, 2017.
ASTM D3080/D3080M-11 Standard Test Method for Direct Shear Test of Soils Under Consolidated Drained Conditions (Withdrawn 2020). USA: ASTM International, 2020.
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Copyright (c) 2025 Lamyaa N. Snodi, Mahmod G. Jassam, Mazin A. Hussein
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