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<p>The growing scarcity of virgin aggregates and increasing environmental concerns have necessitated the adoption of sustainable alternatives in pavement construction. The present study investigates the feasibility of using Reclaimed Asphalt Pavement (RAP) stabilized with Ground Granulated Blast Furnace Slag (GGBS) as a sustainable base material in pavement construction. RAP alone exhibits poor mechanical performance due to aged bitumen; however, stabilization with GGBS significantly enhances its engineering properties. A mix of 80% virgin aggregates (VA) with 15% GGBS and 20% RAP exhibited a California bearing ratio (CBR) of 165.33% and an unconfined compressive strength (UCS) of 4.52&#xa0;MPa, which fulfils the MoRTH specifications for base layer applications. Finite element modelling using ABAQUS was carried out to evaluate stresses, strains, and deformations, with model validation performed against IIT_PAVE results. The RAP-GGBS treated base exhibited reduced horizontal tensile strain at the bottom of the bituminous layer and lower subgrade deformation, indicating improved fatigue and rutting performance. Notably, the RAP-GGBS stabilized pavement achieved a 95&#xa0;mm reduction in total pavement thickness compared to the conventional section without compromising structural safety. The findings demonstrate that GGBS-stabilized RAP is a structurally efficient and sustainable alternative for flexible pavement base layer construction.</p>

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Evaluating the effectiveness of ground granulated blast furnace slag stabilized RAP material for flexible pavement base layer construction

  • 期刊论文

  • 发表日期：

    2026年2月19日

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  • Pratik Jaiswal,
  • Sitarami Reddy,
  • Mohan H Badiger,
  • Sardar Dilbag Singh Khalsa

摘要

The growing scarcity of virgin aggregates and increasing environmental concerns have necessitated the adoption of sustainable alternatives in pavement construction. The present study investigates the feasibility of using Reclaimed Asphalt Pavement (RAP) stabilized with Ground Granulated Blast Furnace Slag (GGBS) as a sustainable base material in pavement construction. RAP alone exhibits poor mechanical performance due to aged bitumen; however, stabilization with GGBS significantly enhances its engineering properties. A mix of 80% virgin aggregates (VA) with 15% GGBS and 20% RAP exhibited a California bearing ratio (CBR) of 165.33% and an unconfined compressive strength (UCS) of 4.52 MPa, which fulfils the MoRTH specifications for base layer applications. Finite element modelling using ABAQUS was carried out to evaluate stresses, strains, and deformations, with model validation performed against IIT_PAVE results. The RAP-GGBS treated base exhibited reduced horizontal tensile strain at the bottom of the bituminous layer and lower subgrade deformation, indicating improved fatigue and rutting performance. Notably, the RAP-GGBS stabilized pavement achieved a 95 mm reduction in total pavement thickness compared to the conventional section without compromising structural safety. The findings demonstrate that GGBS-stabilized RAP is a structurally efficient and sustainable alternative for flexible pavement base layer construction.