Effectiveness of Pongamia pinnata oil as rejuvenator for higher utilization of reclaimed asphalt (RAP) material
- PDF / 1,729,925 Bytes
- 14 Pages / 595.276 x 790.866 pts Page_size
- 74 Downloads / 170 Views
TECHNICAL PAPER
Effectiveness of Pongamia pinnata oil as rejuvenator for higher utilization of reclaimed asphalt (RAP) material Sujit Kumar Pradhan1 · Umesh Chandra Sahoo2 Received: 7 May 2020 / Accepted: 14 July 2020 © Springer Nature Switzerland AG 2020
Abstract An increasing trend in utilization of the reclaimed asphalt pavement (RAP) for pavement recycling is being noticed due to its cost-effectiveness and environmental sustainability. Most of the studies recommend to add RAP only up to 30% except a few which recommends up to 50% based on the convenience in field application. However, there is a scope for higher RAP utilization through the addition of rejuvenators or recycling agents. In this study, a non-edible oil (i.e. Pongamia oil) obtained from Pongamia pinnata was used as a rejuvenator for design of recycled hot mix asphalt (HMA) with higher RAP content. Rheological tests revealed that about 5% dosage of the rejuvenator is adequate to meet the performance in terms of rutting and fatigue cracking. The rejuvenated binder was found to be thermostatically stable when exposed to temperature up to 230 °C as observed from thermogravimetric analysis (TGA). The performance of the HMA containing a varying percentage of RAP (30% to 70%) with the addition of a softer binder and with the addition of rejuvenator was studied or compared in terms of volumetric properties, indirect tensile strength (ITS), moisture sensitivity, resilient modulus, rutting and intermediate temperature cracking. Results indicate that by adding the Pongamia oil as a rejuvenator, RAP up to 60% may be used in the production of HMA without affecting the performance significantly. Keywords Recycled asphalt pavement · Rejuvenator · Pongamia oil · Rheology · Rutting · Moisture sensitivity
Introduction Higher utilization of RAP materials in producing fresh HMA appreciates economic intensification and environmental protection due to the reduction in the material expenses as well as reduction in conveyance and handling of the traditional asphalt binders. However, higher RAP content creates undesirable properties in the mixture because of high stiffness of the binder and probably due to partial existence of thin film of binder around the aggregates. To moderate these issues, efforts have been made through various methodologies [1–7]. Utilizing higher RAP content in HMA results in higher stiffness with a consequence of low workability. As * Sujit Kumar Pradhan [email protected] Umesh Chandra Sahoo [email protected] 1
Department of Civil Engineering, Indira Gandhi Institute of Technology Sarang, Dhenkanal, Odisha 759146, India
School of Infrastructure, Indian Institute of Technology Bhubaneswar, Bhubaneswar, Odisha, India
2
a result, it anticipates inadequate compaction in the field leading to untimely failure. Rejuvenators or softer binders have the potential to successfully enhance the performance of the mixtures containing higher RAP content. Rejuvenator usually contains large quantity of maltenes that reduce the asphaltene-to-malt
Data Loading...
