Investigation of chemical impacts of polar optimization of rejuvenators on aged binder

Document Type : Research Paper

Authors

1 Professor, Department of Raod and Transportation, Faculty of Civil Engineering, K.N.Toosi University, Tehran, I.R. Iran

2 Faculty of Civil Engineering, K.N.Toosi University, Tehran, I.R. Iran.

3 Faculty of Civil Engineering, K.N.Toosi University, Tehran, I.R. Iran

Abstract

Bitumen aging is one of the inevitable characteristics of asphalt and it causes excessive bitumen hardness and brittleness. Therefore, rejuvenators are recommended for use in aged asphalt mixtures and to improve the performance of recycled asphalt mixtures. Using from optimized percentages of rejuvenators is one of the most challenging aspects of using these additives in aged bitumen. In this study, optimized percentages were calculated by the penetration grades, polar parameters of surface free energy and penetration indices of three different rejuvenators including waste cooking oil (WCO), waste engine oil (WEO) and aromatic extraction oil. Also, Response surface method (RSM) was used for optimization of rejuvenators' utilization. Finally, the optimized samples were investigated by using Fourier transform infrared spectrometer (FTIR) so, its effective indicators such as sulphoxide indices, carbonyl indices, oxidation parameters and malten to asphaltene ratios were calculated. Aromatic extraction oil reduced carbonyl index and sulfoxide index by approximately 60% and 67%, respectively. Waste cooking oil had the greatest increase in the malten to asphaltene proportion with increase of 114% and the largest decrease in the oxidation ratio by68%, while the waste engine oil had the least effect with 74% growth of the ratio of malten to asphaltene and 55% reduction of oxidation parameter.

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History

  • Receive Date: 03 October 2024
  • Revise Date: 08 March 2025
  • Accept Date: 05 April 2025

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