Rejuvenating Aged Asphalt Binder from Reclaimed Asphalt Pavement through the Utilization of Waste Cooking Oil

Abstract

This study investigates the use of waste cooking oil to rejuvenate aged asphalt binder from reclaimed asphalt pavement (RAP) in Peshawar, aligning with National Highway Authority (NHA) standards. Aged binder from RAP near Zintara Residence on Peshawar\'s Ring Road was combined with filtered cooking oil from local restaurants in varying proportions (1% to 5%). The rejuvenated binders underwent extensive physical and rheological tests, showing that certain fractions of cooking oil effectively revitalized the old binder, aligning it with virgin bitumen qualities. Superpave experiments on RAP mixes (30%, 40%, 50%) demonstrated comparable performance to fresh asphalt, particularly at 30% to 40% replacement levels. The results suggest that revitalized RAP holds promise as a sustainable alternative, enhancing asphalt mixes for road construction.

Introduction

I. INTRODUCTION

This study addresses the deterioration of asphalt pavements in Peshawar, Pakistan, exacerbated by diverse climate conditions. Aging asphalt binders from reclaimed asphalt pavement (RAP) contribute to decreased pavement durability. Following National Highway Authority (NHA) guidelines, the study explores the use of leftover cooking oil as a rejuvenating agent for aged asphalt binders. The research aims to improve pavement performance while addressing the environmental challenge of used cooking oil disposal. Through extensive experimentation aligned with NHA standards, the study anticipates providing valuable insights into enhancing the engineering qualities of aging asphalt binders in Peshawar's distinct climate, supporting sustainable infrastructure development goals.

A. Experimental Investigation

In this study, the experimental task involved the preparation of a total of 36 Marshall samples. Three distinct bitumen contents (4.0%, 4.3%, and 4.6%) and a 3% Waste Cooking Oil (WCO) were chosen for investigation. Each Marshall sample necessitates a total of 1250 grams of aggregates, WCO, and bitumen, with the WCO quantity set at 3%. The specific details for the remaining aggregates are as follows:

Conclusion

The results distinctly indicate an enhancement in the Marshall stability of Waste Cooking Oil (WCO) modified samples compared to conventional asphalt. Notably, at a 40% Rejuvenated Reclaimed Asphalt Pavement (RAP) replacement, the stability reached its maximum across all bitumen content percentages. However, it is noteworthy that the flow of the modified samples increased, particularly at the 50% RAP replacement. Despite this increased flow, the stability of WCO modified samples demonstrates favorable outcomes.

References

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Copyright

Copyright © 2023 Muhammad Asim, Muhammad Tariq, Rawid Khan. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.