Introduction/purpose: This research investigates the durability of roller-compacted concrete pavement (RCCP) incorporating reclaimed asphalt pavement (RAP) as a partial or full replacement for natural aggregates (NA). The primary objective is to assess the feasibility of using RAP in pavement concrete from both performance and sustainability perspectives. ACKNOWLEDGMENT: This research was supported by the Innovative Materials Laboratory and Renewable Energies, Civil Engineering Department, University of Relizane, Algeria, under the authority of the Ministry of Higher Education and Scientific Research. Methods: Concrete mixtures were prepared with four RAP substitution levels: 25%, 50%, 75%, and 100%. Durability tests were performed to evaluate the resistance of these mixes to acid and sulfate attacks. Additionally, microstructural analyses were conducted using scanning electron microscopy (SEM) and X-ray diffraction (XRD) to examine internal changes resulting from chemical exposure. Results: The incorporation of RAP improved durability against acid and sulfate attacks, particularly at substitution levels up to 50%. Beyond this threshold, a slight decline in performance was observed, though it remained within acceptable limits. SEM images revealed a denser matrix and stronger bonding between the cement paste and RAP aggregates. XRD analysis confirmed the presence of stable hydration products, even after exposure to aggressive solutions. Conclusion: The findings support the use of RAP as a viable and sustainable alternative to NA in RCCP. At optimal substitution levels, it enhances durability, contributes to environmental protection, reduces construction waste, and offers cost-effective solutions by utilizing recycled materials.
Ali et al. (2026) studied this question.