Evaluation of Factors Affecting the Performance of Fiber-Reinforced Subgrade Soil Characteristics Under Cyclic Loading

Frank I. Aneke; Shadi Hanandeh; Denis Kalumba

doi:10.28991/CEJ-2023-09-08-015

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Frank I. Aneke
AnekeF@ukzn.ac.za
Geotechnics and Materials Development Research Group (GMDRg) Civil Engineering, University of KwaZulu-Natal, Durban 4004,, South Africa
Shadi Hanandeh Associate Professor, Department of Civil Engineering, Al-Balqa Applied University, Salt, 19117, Jordan
Denis Kalumba Department of Civil Engineering, University of Cape Town, Cape Town,, South Africa

Vol. 9 No. 8 (2023): August

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This study is focused on evaluating the factors affecting the performance of fiber-reinforced subgrade under cyclic loading. To achieve the objectives of this study, a series of dynamic triaxial (DT) tests was performed, and the following parameters, such as resilient modulus (M_R), number of loading cycles (N), cyclic stress (CS), resilient strain (RS), and stress-strain hysteresis response of both the reinforced and unreinforced subgrades were evaluated. Subsequently, a series of scanning electron microscope (SEM) tests was conducted to track the fiber-soil interfacial bonding after the completion of DT test. The results indicated that N and CS triggered an appreciable decrease in M_R with significantly high RS deformation for the unreinforced subgrade. However, reversed responses were noted upon the inclusion of sisal fiber due to fiber-soil adhesion and a high ductility response was portrayed by the reinforced subgrades. A reversed response was significant upon 0.25% and 0.5% fiber inclusion, beyond which the CS resistance slightly decreased. The stress-strain hysteresis loop was observed to increase as the axial strain increased proportionally with an increase in fiber contents, thus causing a significant increase in energy absorption in specimens. The SEM micrograph showed tightly knitted fiber-soil adhesion after the DT test. This study indicated that the reinforced subgrade sustained the CS, N, and improved energy absorption capacity, and M_Rupon fiber inclusion.

Doi: 10.28991/CEJ-2023-09-08-015

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Aneke, F. I., Hanandeh, S., & Kalumba, D. (2023). Evaluation of Factors Affecting the Performance of Fiber-Reinforced Subgrade Soil Characteristics Under Cyclic Loading. Civil Engineering Journal, 9(8), 2046–2061. https://doi.org/10.28991/CEJ-2023-09-08-015

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Evaluation of Factors Affecting the Performance of Fiber-Reinforced Subgrade Soil Characteristics Under Cyclic Loading

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