Volume- 9
Issue- 2
Year- 2022
DOI: 10.55524/ijirem.2022.9.2.73 | DOI URL: https://doi.org/10.55524/ijirem.2022.9.2.73
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0) (http://creativecommons.org/licenses/by/4.0)
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Rayees Ahmad Dar , Er. Brahamjeet Singh
With the advent of new technologies, the use of Recycled Asphalt Pavement material (RAP) has gained increasing importance. Using RAP not only economises Asphalt production, but also decreases the demand for virgin material. The limit in the use of RAP proportion is restricted due to stiffness and workability issues related to RAP. This problem is addressed with the help of Warm Mix Asphalt (WMA) which increases the proportion of RAP used by producing mixes having same/better properties viz., better workability, reduced viscosity than Hot Mix Asphalt (HMA) at lower temperatures. The use of Rejuvenator has also improved workability of RAP- HMA mixes by rejuvenating the stiff binder of RAP. This study deals with the effect of Rejuvenator on WMA mixes produced with different proportions of RAP. In this study effect of varying proportions (Viz. 10%,15% & 20%) of Used-Mobile Engine Oil (Rejuvenator), used in conjunction with 0.5% Evotherm (WMA additive) was studied with different proportions of RAP. The Evotherm additive dosage of 0.5% by weight of bitumen and Rejuvenator dosage of 10%, 15% and 20% by weight of bitumen was taken on the basis of research by Hurley & Prowell 2006, and Zaumanis et al 2014 respectively. Laboratory study was conducted involving material characterization of Virgin and RAP material, followed by Mix design of Dense Bituminous Macadam (DBM) using Virgin and RAP Material. Various tests viz., Marshal Stability, Retained Stability, Indirect Tensile Strength, Unconfined Compressive Strength, Compactibility and Aggregate Coating were conducted on HMA and WMA Mixes prepared from virgin materials, and WMA mixes prepared with 20%, 40% and 60% RAP material. These tests helped in analysis and determination of Density, Voids, Flow value, Strength, Moisture Susceptibility, Aggregate Coating, etc. Based on the above analysis it was found that the optimum dosage of Rejuvenator for Warm Mixes prepared with 20%, 40% and 60% RAP material is 10%, 15% and 20% respectively. All the three RAP proportions with these Optimum dosages of Rejuvenator satisfied all the requirement of DBM mix (MORTH specification) prepared using Warm Mix technology. It was also found that upto 20% RAP material can be used to prepare WMA mixes even without addition of Rejuvenator and that the optimum bitumen content is reduced as RAP proportion is increased. This results in saving in the overall cost by lesser use of Virgin materials.
Scholar, Department of Civil Engineering, RIMT University, Punjab, India
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