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<p>This study investigates the effect of cement treatment, glass fiber (GF) reinforcement and their combined application on the mechanical and durability characteristics of Karewa soil (KS). A comprehensive testing program was designed in which 14 different groups of KS samples were prepared with varying contents of cement (2%, 4%, 6%, 8% and 10%), GF (0.4%, 0.6%, 0.8%, and 1.0%) and their combinations. Strength evaluation was examined by conducting a set of unconfined compressive strength (UCS) and split tensile strength (STS) tests on samples cured for 7, 14, and 28 days. GF reinforced samples demonstrated strain hardening, while cement-treated samples demonstrated strain softening behavior. Test results revealed 17.5 times strength gain (from 145 kPa to 2542 kPa) at an optimal cement content of 8% and a GF content of 0.8%. The stress–strain patterns depicted that the inclusion of 0.8% GF to 8% cement treated KS samples increased the ductility index (DI) by a factor of 3.14 (from 0.29 to 0.91). The impact of cement and fiber reinforcement on durability of Karewa soil was assessed by strength retention index (SRI), which increased from 0.45 to 0.91 for samples treated with 8% cement and 0.8% GF. All samples for SRI evaluation were subjected to 1, 4, 8, and 12 standard freeze-thaw (F-T) cycles after 7 and 28 days of curing. For the optimized mix, the UCS decreased from 2542 kPa (uncycled) to 2313 kPa after 12 cycles, corresponding to an SRI of 0.91. This improvement in the mechanical and durability characteristics is attributed to cementitious bonding from hydration reactions and bridging action of GF. The formation of cementitious products responsible for strength gain were evidenced by XRD spectroscopy. Furthermore, EDAX and FESEM results demonstrated distinct alterations in elemental composition and interfacial morphological modifications. The study highlights that integrating chemical stabilization with fiber reinforcement offers a synergistic approach in enhancing soil strength, ductility and durability, presenting a viable solution for ground improvement.</p>

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Synergistic Effect of Cement Stabilization and Glass Fiber Reinforcement on the Mechanical and Durability Characteristics of Karewa Soil

  • 期刊论文

  • 发表日期：

    2025年8月24日

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  • Mohammad Iqbal Mirza,
  • Bashir Ahmed Mir

摘要

This study investigates the effect of cement treatment, glass fiber (GF) reinforcement and their combined application on the mechanical and durability characteristics of Karewa soil (KS). A comprehensive testing program was designed in which 14 different groups of KS samples were prepared with varying contents of cement (2%, 4%, 6%, 8% and 10%), GF (0.4%, 0.6%, 0.8%, and 1.0%) and their combinations. Strength evaluation was examined by conducting a set of unconfined compressive strength (UCS) and split tensile strength (STS) tests on samples cured for 7, 14, and 28 days. GF reinforced samples demonstrated strain hardening, while cement-treated samples demonstrated strain softening behavior. Test results revealed 17.5 times strength gain (from 145 kPa to 2542 kPa) at an optimal cement content of 8% and a GF content of 0.8%. The stress–strain patterns depicted that the inclusion of 0.8% GF to 8% cement treated KS samples increased the ductility index (DI) by a factor of 3.14 (from 0.29 to 0.91). The impact of cement and fiber reinforcement on durability of Karewa soil was assessed by strength retention index (SRI), which increased from 0.45 to 0.91 for samples treated with 8% cement and 0.8% GF. All samples for SRI evaluation were subjected to 1, 4, 8, and 12 standard freeze-thaw (F-T) cycles after 7 and 28 days of curing. For the optimized mix, the UCS decreased from 2542 kPa (uncycled) to 2313 kPa after 12 cycles, corresponding to an SRI of 0.91. This improvement in the mechanical and durability characteristics is attributed to cementitious bonding from hydration reactions and bridging action of GF. The formation of cementitious products responsible for strength gain were evidenced by XRD spectroscopy. Furthermore, EDAX and FESEM results demonstrated distinct alterations in elemental composition and interfacial morphological modifications. The study highlights that integrating chemical stabilization with fiber reinforcement offers a synergistic approach in enhancing soil strength, ductility and durability, presenting a viable solution for ground improvement.