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<p>The stiffer cement-treated layers in pavements are prone to fatigue cracking under repetitive wheel loads, leading to the propagation of cracks into the wearing course, which affects the riding comfort. While bound base layers in India are designed based on fatigue criteria as per Indian Road Congress guidelines, the design of bound subbase layers lacks similar fatigue characterisation. The current study investigated the fatigue performance of reclaimed asphalt pavement (RAP) material incorporated open-graded cement-stabilised macadam (OGCSM). The mixtures were stabilised with cement, and two supplementary cementitious materials (SCMs): ground granulated blast furnace slag (GGBFS), and fluidised catalytic cracking (FCC) unit residue. The optimised sample, designated as OGCSMC (control mix), contained an aggregate blend of 60% RAP and 40% VA with 7% cement as a binder. The cement in the control mix was partially substituted with two SCMs, GGBFS (70%) and FCC (40%), denoted as OGCSMG and OGCSMF, respectively. Key performance parameters such as indirect tensile (IDT) strength, resilient modulus, and fatigue life were evaluated for various OGCSM mixtures after 90 days of curing. The inclusion of FCC unit residue significantly enhanced the IDT strength, making it 20% higher than the control OGCSM due to the supercage structure of the mineral in FCC unit residue; however, its brittle nature led to a reduced fatigue life under repeated loading. Conversely, substituting 70% of the cement content with GGBFS improved the flexibility of the OGCSM, reducing the resilient modulus by 20% and significantly enhancing the fatigue performance. A two-parameter Weibull distribution was employed to calculate fatigue life to reduce the discrepancy in the observed values. A power law relationship was used to develop fatigue life constants for OGCSM mixtures at different survival probabilities. The carbon emission of the optimised OGCSMG sample was 58.56% lower than that of the control OGCSM mixture. The findings suggest that GGBFS-modified OGCSM exhibits superior fatigue resistance, making it a promising sustainable material for subbase layers subjected to repeated traffic loads.</p>

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Fatigue performance of RAP-incorporated open-graded cement-stabilised macadam with GGBFS and FCC unit residue

  • 期刊论文

  • 发表日期：

    2025年12月24日

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  • Saranya Ullas,
  • C. S. Bindu,
  • R. Vishnu

摘要

The stiffer cement-treated layers in pavements are prone to fatigue cracking under repetitive wheel loads, leading to the propagation of cracks into the wearing course, which affects the riding comfort. While bound base layers in India are designed based on fatigue criteria as per Indian Road Congress guidelines, the design of bound subbase layers lacks similar fatigue characterisation. The current study investigated the fatigue performance of reclaimed asphalt pavement (RAP) material incorporated open-graded cement-stabilised macadam (OGCSM). The mixtures were stabilised with cement, and two supplementary cementitious materials (SCMs): ground granulated blast furnace slag (GGBFS), and fluidised catalytic cracking (FCC) unit residue. The optimised sample, designated as OGCSMC (control mix), contained an aggregate blend of 60% RAP and 40% VA with 7% cement as a binder. The cement in the control mix was partially substituted with two SCMs, GGBFS (70%) and FCC (40%), denoted as OGCSMG and OGCSMF, respectively. Key performance parameters such as indirect tensile (IDT) strength, resilient modulus, and fatigue life were evaluated for various OGCSM mixtures after 90 days of curing. The inclusion of FCC unit residue significantly enhanced the IDT strength, making it 20% higher than the control OGCSM due to the supercage structure of the mineral in FCC unit residue; however, its brittle nature led to a reduced fatigue life under repeated loading. Conversely, substituting 70% of the cement content with GGBFS improved the flexibility of the OGCSM, reducing the resilient modulus by 20% and significantly enhancing the fatigue performance. A two-parameter Weibull distribution was employed to calculate fatigue life to reduce the discrepancy in the observed values. A power law relationship was used to develop fatigue life constants for OGCSM mixtures at different survival probabilities. The carbon emission of the optimised OGCSMG sample was 58.56% lower than that of the control OGCSM mixture. The findings suggest that GGBFS-modified OGCSM exhibits superior fatigue resistance, making it a promising sustainable material for subbase layers subjected to repeated traffic loads.