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<p>The use of recycled asphalt mixtures can enhance pavement performance while reducing costs and environmental impacts. This study investigates the effect of oil-based rejuvenators on moisture sensitivity of asphalt mixtures. The bitumen in the test was type PG 64 − 16, and four levels of RAP content (25%, 50%, 75%, and 100%) were investigated, along with three types of rejuvenators and recycling agents: sulfonated aromatic (cyclogen), and naphthenic (vacuum bottoms). The experimental plan included 4 RAP content levels (25%, 50%, 75%, and 100%), 4 different sources of asphalt chips from urban and highway roads (Mazandaran, Golestan, Hemmat, and Babaei), and 3 types of rejuvenators (sunflower oil, cyclogen, and vacuum bottoms). Based on the design variables (RAP(4 levels), chip sources(4), rejuvenators(3)), a total of 48 mix design combinations were selected. Including a set of control mixtures without rejuvenator for each chip source (16 combinations (4 RAP levels,4 chip sources)), and 16 additional mixtures with virgin bitumen (no RAP), the total number of evaluated combinations reached 80. Key moisture-related tests such as Rolling Thin Film Oven (RTFO), Fourier Transform Infrared Spectroscopy (FTIR), Rheological Aging Index (RAI), Chemical Aging Index (CAI), Viscosity Aging Index (VAI), and SEM were conducted. Results showed that rejuvenator and chip variations significantly influence moisture resistance, highlighting the role of multivariate regression in modeling moisture damage behavior.</p>

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Predictive modeling of moisture damage in recycled asphalt mixtures: evaluating chip content and rejuvenating agents

  • 期刊论文

  • 发表日期：

    2025年8月30日

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  • Hamidreza Eftekhari,
  • Paraham Hayati,
  • Ali Moniri

摘要

The use of recycled asphalt mixtures can enhance pavement performance while reducing costs and environmental impacts. This study investigates the effect of oil-based rejuvenators on moisture sensitivity of asphalt mixtures. The bitumen in the test was type PG 64 − 16, and four levels of RAP content (25%, 50%, 75%, and 100%) were investigated, along with three types of rejuvenators and recycling agents: sulfonated aromatic (cyclogen), and naphthenic (vacuum bottoms). The experimental plan included 4 RAP content levels (25%, 50%, 75%, and 100%), 4 different sources of asphalt chips from urban and highway roads (Mazandaran, Golestan, Hemmat, and Babaei), and 3 types of rejuvenators (sunflower oil, cyclogen, and vacuum bottoms). Based on the design variables (RAP(4 levels), chip sources(4), rejuvenators(3)), a total of 48 mix design combinations were selected. Including a set of control mixtures without rejuvenator for each chip source (16 combinations (4 RAP levels,4 chip sources)), and 16 additional mixtures with virgin bitumen (no RAP), the total number of evaluated combinations reached 80. Key moisture-related tests such as Rolling Thin Film Oven (RTFO), Fourier Transform Infrared Spectroscopy (FTIR), Rheological Aging Index (RAI), Chemical Aging Index (CAI), Viscosity Aging Index (VAI), and SEM were conducted. Results showed that rejuvenator and chip variations significantly influence moisture resistance, highlighting the role of multivariate regression in modeling moisture damage behavior.