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<p>Weak coastal subgrades composed of poorly graded fine sand often lead to brittle failure in plain concrete pavements due to their high deformability and susceptibility to liquefaction. This study proposes a combined structural–geotechnical approach by integrating Steel Fibre Reinforced Concrete (SFRC) slabs with geotextile-confined sand subgrades to enhance pavement performance under challenging soil conditions. Model-scale experiments were conducted on (400 × 400 × 50) mm SFRC slabs containing steel fibre dosages from 0.0% to 2.0%. All specimens were tested under central static point loading on sand compacted to a loose relative density of 24%. The influence of geotextile confinement was evaluated by comparing ultimate load capacity, settlement behaviour, cracking response, and subgrade stress distribution using load cells, Linear Variable Differential Transformer (LVDTs), and pressure cells. Geotextile encasement substantially improved subgrade performance, reducing settlements by 33–57% and maintaining deformation within approximately 6&#xa0;mm for all mixes. The 1.0% SFRC slab demonstrated the most favourable structural behaviour, achieving the highest compressive strength and flexural capacity. Confined subgrades also showed significant residual strength after slab failure, unlike the rapid strength loss observed in unconfined conditions. The combined SFRC–geotextile system offers a durable, economical, and resilient pavement solution for weak, water-sensitive coastal soils.</p>

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Structural Performance of SFRC Slabs on Sand Sub Grades Enhanced with Geotextile

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Akash Usha Gharde,
  • Yogesh D. Patil,
  • Gaurav D. Dhadse

摘要

Weak coastal subgrades composed of poorly graded fine sand often lead to brittle failure in plain concrete pavements due to their high deformability and susceptibility to liquefaction. This study proposes a combined structural–geotechnical approach by integrating Steel Fibre Reinforced Concrete (SFRC) slabs with geotextile-confined sand subgrades to enhance pavement performance under challenging soil conditions. Model-scale experiments were conducted on (400 × 400 × 50) mm SFRC slabs containing steel fibre dosages from 0.0% to 2.0%. All specimens were tested under central static point loading on sand compacted to a loose relative density of 24%. The influence of geotextile confinement was evaluated by comparing ultimate load capacity, settlement behaviour, cracking response, and subgrade stress distribution using load cells, Linear Variable Differential Transformer (LVDTs), and pressure cells. Geotextile encasement substantially improved subgrade performance, reducing settlements by 33–57% and maintaining deformation within approximately 6 mm for all mixes. The 1.0% SFRC slab demonstrated the most favourable structural behaviour, achieving the highest compressive strength and flexural capacity. Confined subgrades also showed significant residual strength after slab failure, unlike the rapid strength loss observed in unconfined conditions. The combined SFRC–geotextile system offers a durable, economical, and resilient pavement solution for weak, water-sensitive coastal soils.