Strength Assessment of Rice Husk Ash and Bentonite Stabilized Lateritic Soil for Landfill Liners

Joel Godwin; Mary Omada Onah; Dooyum Ephraim Kwaghchimin

doi:10.56201/ijemt.vol.12.no5.2026.pg211.218

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Strength Assessment of Rice Husk Ash and Bentonite Stabilized Lateritic Soil for Landfill Liners

Joel Godwin, Mary Omada Onah, and Dooyum Ephraim Kwaghchimin

Abstract

This study investigates the strength behavior of lateritic soil stabilized with rice husk ash and bentonite for potential application as landfill liners. Laboratory tests were conducted to evaluate the basic properties, compaction characteristics, and unconfined compressive strength of the stabilized mixtures under varying compaction efforts (BSH, WAS, and BSL) and moisture conditions (dry of optimum, optimum, and wet of optimum). The stabilized mixtures were prepared by blending laterite with varying proportions of bentonite (0–12%) and fixed RHA contents at 8%. The lateritic soil was classified as highly plastic clay (CH), while bentonite exhibited high swelling capacity and RHA demonstrated significant pozzolanic potential due to its high silica content. Compaction results showed that maximum dry density decreased with increasing bentonite content, while optimum moisture content increased as a result of the high-water absorption of RHA and bentonite. UCS results revealed that only mixtures compacted under heavy and intermediate efforts, with 6–9% bentonite at 8% RHA, achieved the recommended UCS range of 200–400 kN/m2 for landfill liners. Excess bentonite (12%), light compaction , and wet-of-optimum states significantly reduced strength due to increased void ratios and moisture-induced weakening. The findings highlight the suitability of RHA–bentonite stabilized lateritic soil as a cost- effective liner material when optimized at appropriate binder content, compaction, and moisture conditions.

Keywords

Lateritic soilBentoniteRice husk ashStrengthLandfill liners

References

Amadi, A. A., & Eberemu, A. O. (2013). Characterization of Geotechnical Properties of Lateritic Soil – Bentonite Mixtures Relevant to their use as Barrier in Engineered Waste Landfills. Nigerian Journal of Technology, 32(1), 93-100. https://doi.org/10.4314/njt.321.618 Amadi, A.A., & Isah, S.D. (2024). Assessment of Two SWCC models for predicting the curve fitting parameters of lateritic soil: bentonite mixtures. Discov Civ Eng 1, 6 (2024). https://doi.org/10.1007/s44290-024-00006-w Aswathy, C. M. & Sunil, B.M. (2024). Improving landfill liner performance with bentonite- slag blend permeated with ammonia for a Municipal solid waste landfill. Journal of Environmental Management, Vol. 367, 2024, 122013, https://doi.org/10.1016/j.jenvman.2024.122013 BS 1377 (1990). Methods of Testing Soil for Civil Engineering Purposes. British Standard Institute. London. BS 1924 (1990). Method of Testing for Stabilized Soils. British Standard institute. London. Devapriya, A.S. & Thyagaraj, T. (2024). Evaluation of red soil-bentonite mixtures for compacted clay liners, Journal of Rock Mechanics and Geotechnical Engineering, Vol. 16, Issue 2, 697-710, https://doi.org/10.1016/j.jrmge.2023.04.006. Eyo, E.; Abbey, S., Oti, J., Ng’ambi, S., Ganjian, E. & Coakley, E. (2021). Microstructure and Physical-Mechanical Characteristics of Treated Kaolin-Bentonite Mixture for Application in Compacted Liner Systems. Sustainability, 13, 1617. https://doi.org/10.3390/su13041617 Jain, A. K., Jha, A. K., & Akhtar, P. M. (2022). Assessing the swelling and permeability behavior of novel marble dust–bentonite with sand–bentonite mixes for use as a landfill liner material. Indian Geotechnical Journal, 52(3), 675-690. Okafor, F. O., & Okonkwo, U. N. (2009). Effects of Rice Husk Ash on some Geotechnical Properties of Lateritic Soil. Nigerian Journal of Technology, 28(1), 46-52. https://doi.org/10.4314/njt.281.128 Xiang, R., Qian, C., Yao, G., Liu, Y., Du, H., Xu, Y., & Huang, Q. (2024). Environmental safety performance dynamics and estimation of the deterioration of leachate containment elements: Implications for the lifespan of hazardous waste landfills. Journal of Cleaner Production, 475, 143601. Zeng, Z., Cui, Y. J., & Talandier, J. (2021). Compaction and sealing properties of bentonite/claystone mixture: Impacts of bentonite fraction, water content and dry density. Engineering Geology, 287, 106122.

Strength Assessment of Rice Husk Ash and Bentonite Stabilized Lateritic Soil for Landfill Liners

Abstract

Keywords

References

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