Evaluation of recycled asphalt mixtures rejuvenated with Madhuca longifolia (Mahua) oil
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International Journal of Pavement Research and Technology Journal homepage: www.springer.com/42947
Evaluation of recycled asphalt mixtures rejuvenated with Madhuca longifolia (Mahua) oil Sujit Kumar Pradhana*, Umesh Chandra Sahoob a
Indira Gandhi Institute of Technology Sarang, Odisha, India Indian Institute of Technology Bhubaneswar, Odisha, India
b
Received 27 October 2019; received in revised form 30 May 2020; accepted 6 June 2020
Abstract
Reuse of reclaimed asphalt pavement (RAP) material not only leads to environmental sustainability, but also lowers down the o f construction cost. However successful addition of RAP is limited to replacement level of 50%, as it is believed that higher quantity of the RAP makes th e asphalt more susceptible to fatigue and thermal cracking. Studies on rejuvenation of aged binders recommend that it is possible to use higher percentage of RAP by using recycling agents or rejuvenators. Different types of oils such as vegetable oil, tall oil, cotton seed oil, waste engine oil, pongamia oil and soybean oil etc. have been explored as rejuvenators. In this study, Madhuca longifolia oil (Mahua oil), another oil produced largely in eastern part of India has been assessed as a potential rejuvenator to design recycled Hot Mix Asphalt (HMA) with high RAP content. Suitable dosage of the rejuvenator was decided based on the evaluation of rheological characteristics of the rejuvenated aged binder using a Dynamic Shear Rheometer (DSR). Performance o f the conventional asphalt mixture and rejuvenated mixtures containing RAP with varying (30-70 %) RAP percentages was assessed in terms of volumetric properties, indirect tensile strength, moisture sensitivity, resilient modulus, rutting, fatigue, low temperature cracking. Results were compared with the performance of recycled HMA made using softer binder grade. Results indicate that recycled mixtures with RAP content up to 60% can be successfully designed with addition of Madhuca longifolia oil to meet the without notably influencing the performance of the pavement. Keywords: Reclaimed asphalt pavement; Recycling; Sustainability; Rejuvenator; Mahua oil; Softer binder
1. Introduction About 80% of the pavements across the globe are asphalt pavements, which are normally designed for a period of 15 years. However due to overloading, the asphalt pavements in India are experiencing various distresses causing failure of these pavements. In urban areas, the top few centimeters of asphalt is usually scarified to overlay with fresh mix and to match the adjacent geometrics of the road. This results in huge quantity of RAP material produced every year from pavement maintenance. Effective utilization of this RAP to make new HMA mixtures not only leads to environmental sustainability in terms of saving natural resources and reduced energy consumption, but also lowers down the of construction cost. The main problem for utilizing high percentages of RAP in producing new asphalt pavement is due to the presence of aged binder. This aged binder makes high quan
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