What question did this study set out to answer?

The research aims to optimize recycled asphalt mixtures by incorporating waste engine oil to improve their performance for road infrastructure.

April 22, 2026Open Access

The Design and Engineering Application of Recycled Asphalt Mixture Based on Waste Engine Oil

Key Points

The research aims to optimize recycled asphalt mixtures by incorporating waste engine oil to improve their performance for road infrastructure.
Prepared RAM specimens with 30% RAP content, aged for 5 and 10 years from Ningxia.
Conducted laboratory tests for various performance metrics including rutting, moisture susceptibility, and fatigue.
Utilized FTIR and TLC-FID to analyze the regeneration mechanism of waste engine oil.
Waste engine oil modified the asphalt structure, enhancing performance, but excessive amounts reduced high-temperature stability.
Optimal waste engine oil contents were found to be 4% for 5-year RAP and 8% for 10-year RAP.
Overall asphalt mixture performance was significantly improved, tailored for Ningxia's climate.

Abstract

To address the growing demand for sustainable road infrastructure development andresolve technical bottlenecks in reclaimed asphalt pavement (RAP) recycling, this studyoptimized the performance of recycled asphalt mixtures (RAMs) and validated their engineeringapplicability for field construction. RAM specimens were prepared using 5-yearand 10-year aged RAP from Ningxia, with a constant RAP content of 30%. Laboratorytests including high-temperature rutting, moisture susceptibility, low-temperature cracking,dynamic modulus, and four-point bending fatigue were performed to determine theoptimal mix proportion. Fourier Transform Infrared Spectroscopy (FTIR) and Thin-LayerChromatography-Flame Ionization Detection (TLC-FID) were employed to reveal the regenerationmechanism of waste engine oil (WEO). Results showed that WEO modified thefunctional groups and four fractions of asphalt, optimizing its colloidal structure, whileexcessive WEO compromised high-temperature stability. The optimal WEO contents were4% for RAP (5Y) and 8% for RAP (10Y), which significantly enhanced the overall performanceof RAM to adapt to Ningxia’s climate. This study provides technical support forsustainable road infrastructure in arid and semi-arid regions.

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Cite This Study

Men et al. (Mon,) studied this question.

synapsesocial.com/papers/69e866f16e0dea528ddeb427 https://doi.org/https://doi.org/10.3390/infrastructures11040142

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