Use of Rejuvenators for Production of Sustainable Hot Mix Asphalt with High Reclaimed Asphalt Content
The Innovation Exchange (GRAD 2013) 2013
Mārtiņš Zaumanis, Rajib B. Mallick, Robert Frank

In order to sustain the needs of the 21st century civil infrastructure, we need a paradigm shift in recycling – from the current 20-40% to 100 % (zero waste). The research is aimed at developing a simple method for evaluation of rejuvenators’ effectiveness for production of up to 100% RAP mixtures. Because of the presence of stiffer (aged) binders, high RAP content mixes are perceived to be more susceptible to fatigue and thermal cracking failures than virgin mixtures. Appropriate choice of rejuvenator may allow recovering the properties of aged binder by reconstructing the chemical composition of the aged binder. Twelve differently originated rejuvenators were evaluated in the study to restore aged RAP, including different types of plant oils, waste derived petroleum oils, engineered products as well as bio based rejuvenators. Empirical binder test methods were used on extracted binder to determine softening efficiency of the rejuvenators and the rejuvenation quality. 100% RAP rejuvenated mixtures were tested at wide range of in-service temperatures including evaluation of low temperature and fatigue cracking, moisture susceptibility and rut resistance. The test results have shown that at least five rejuvenators are capable of reducing the binder viscosity to the required level and significantly improving the performance of RAP mixture. Future stages of the research will include mix design optimization to achieve the performance of virgin mixture and development of simple acceptance criteria for choosing rejuvenator.


Keywords
rejuvenators, RAP

Zaumanis, M., Mallick, R., Frank, R. Use of Rejuvenators for Production of Sustainable Hot Mix Asphalt with High Reclaimed Asphalt Content. In: The Innovation Exchange (GRAD 2013), United States of America, Worcester, 28-28 March, 2013. Worcester: WPI, 2013, pp.49-50.

Publication language
English (en)
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