Advanced International Journal for Research

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Laboratory Investigation of Fatigue Performance of DBM-II Mixes Incorporating RAP Using Unmodified and Modified Bitumen

Author(s) Mr. Sumanth S, Dr. Manjesh L
Country India
Abstract This study evaluates the mechanical performance of Dense Bituminous Macadam (DBM-II) mixes incorporating reclaimed asphalt pavement (RAP) and different filler materials using VG-40 and PMB-40 binders. A total of 24 mix combinations were prepared by varying RAP content (0–30%) and filler type (stone dust, fly ash, and GGBS). Marshall stability tests were conducted to determine optimum binder content, while indirect tensile strength (ITS), indirect tensile fatigue test (ITFT), and resilient modulus (MR) assessments were carried out to evaluate durability and deformation characteristics. Results showed that all mixes satisfied MoRTH specifications, confirming their structural adequacy. PMB-40 binder consistently enhanced stability, tensile strength, and durability compared to VG-40, while GGBS emerged as the most effective filler, followed by stone dust and fly ash. The resilient modulus increased with RAP incorporation due to aged binder stiffness, though fatigue life decreased with higher RAP content. Overall, PMB-40 mixes with GGBS filler exhibited the most balanced performance, ensuring superior stability, stiffness, and crack resistance, thereby establishing their suitability for sustainable DBM-II pavement applications.
Keywords Reclaimed Asphalt Pavement, Dense Bituminous macadam, Marshall Stability
Field Engineering
Published In Volume 6, Issue 5, September-October 2025
Published On 2025-10-28
DOI https://doi.org/10.63363/aijfr.2025.v06i05.1713
Short DOI https://doi.org/g99qn6
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