What is it about?
Cold recycled material (CRM) mixtures are a sustainable alternative to HMA. In this paper, first we review existing approaches to measure and model their rheological behavior using the complex modulus. Then, we show experimental data measured on three CRM mixtures and apply a new rheological model.
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Why is it important?
The review part is interesting because it shows for the first time how researchers approached this topic in the past decade. The results confirm that the time-temperature superposition principle can be applied to CRM mixtures produced with different stabilizing agents, like bitumen emulsion and foamed bitumen. We also showed that it can be applied when cement is the only stabilizing agent. Finally, we present an original rheological model, derived from the well-known Huet-Sayegh model, that addresses the non-viscous dissipation phenomena that occur within the material.
Perspectives
I hope this paper will spark the interest on the rheological behavior of CRM mixtures. Although the performance of these mixtures is inferior to that of conventional HMA, I believe their potential is greatly underestimated. We can obtain high performance CRM mixtures by exploiting the benefits of using bitumen emulsion and Portland cement as co-binders.
Andrea Graziani
Universita Politecnica delle Marche
Read the Original
This page is a summary of: Complex Modulus Testing and Rheological Modeling of Cold-Recycled Mixtures, Journal of Testing and Evaluation, July 2019, ASTM International,
DOI: 10.1520/jte20180905.
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