In this study, an asphalt binder was modified with additives synthesized from soybean oil and tall oil. The soybean oil-derived additive, which was an epoxidized methyl soyate (EMS), was engineered at Iowa State University, and the tall oil-based analogue was a commercially available product. The binder modifications were accomplished in an asphalt terminal. The resulting binders were used for reversing the undesired effects of reclaimed asphalt pavement (RAP) in mixtures containing 30% of this material, i.e., RAP. These mixtures that were prepared for a pavement demonstration project that occurred in Obrien County, Iowa, U.S, in 2017, were produced in an asphalt plant, and each mixture type was used for paving a half-a-mile stretch of a high-volume roadway. To predict the field performance of the mixtures, the low temperature cracking and fatigue cracking resistance of the mixtures were evaluated using disc-shaped compact tension (DCT) and push-pull fatigue tests, respectively. The results revealed that the EMS restorative reactive modifier (RRM) used in this study results in a significant improvement in the low temperature cracking resistance and fatigue performance of RAP-incorporated asphalt mixtures. Also, the tall oil-based rejuvenator, to some degree, resulted in improving the low temperature cracking resistance and fatigue performance of asphalt mixtures containing RAP.

Access the Conference Proceedings Paper on ASCE Library 

In this study, an asphalt binder was modified with additives synthesized from soybean oil and tall oil. The soybean oil-derived additive, which was an epoxidized methyl soyate (EMS), was engineered at Iowa State University, and the tall oil-based analogue was a commercially available product. The binder modifications were accomplished in an asphalt terminal. The resulting binders were used for reversing the undesired effects of reclaimed asphalt pavement (RAP) in mixtures containing 30% of this material, i.e., RAP. These mixtures that were prepared for a pavement demonstration project that occurred in Obrien County, Iowa, U.S, in 2017, were produced in an asphalt plant, and each mixture type was used for paving a half-a-mile stretch of a high-volume roadway. To predict the field performance of the mixtures, the low temperature cracking and fatigue cracking resistance of the mixtures were evaluated using disc-shaped compact tension (DCT) and push-pull fatigue tests, respectively. The results revealed that the EMS restorative reactive modifier (RRM) used in this study results in a significant improvement in the low temperature cracking resistance and fatigue performance of RAP-incorporated asphalt mixtures. Also, the tall oil-based rejuvenator, to some degree, resulted in improving the low temperature cracking resistance and fatigue performance of asphalt mixtures containing RAP.

**[Access the Conference Proceedings Paper on ASCE Library](https://ascelibrary.org/doi/10.1061/9780784483510.001)** 

The Improvement of Thermal Cracking Resistance and Fatigue Life of RAP-Incorporated Asphalt Mixtures with the Aid of Bio Oil-Based Modifiers

Welcome to the International Airfield and Highway Pavements Conference of the Transportation & Development Institute (T&DI) of ASCE. This international conference will provide an unrivaled chance to interact and exchange information with worldwide leaders in the fields of highway and airport pavements, as well as airport safety technologies.

This conference will bring together designers, project/construction managers, academics, and contractors from around the world to discuss the state-of-the-art implementation, construction, design, in airfield and highway pavements.

Paper Proceedings: https://doi.org/10.1061/9780784483527 | https://doi.org/10.1061/9780784483503 | https://doi.org/10.1061/9780784483510