Rheological behavior of asphalt binders modified with fourth generation rubber asphalts (pellets)
DOI:
https://doi.org/10.58922/transportes.v31i2.2692Keywords:
Asphalt rubber pellets, Sustainability, Laboratory evaluation, RheologyAbstract
Among the materials used as asphalt binder modifiers, waste tire granulated rubber has shown good results in terms of improving resistance to permanent deformation, fatigue cracking and aging. The 4th generation rubber-asphalts are sold in the form of pellets. This configuration facilitates the process of mixing the pellets with binder and mineral aggregates, making the process of obtaining rubber-asphalt faster and sustainable technology with low pollutant emissions. The 4th generation of asphalt-rubber is related to the production of mixtures and not asphalt binders. However, the purpose of this study was to evaluate the asphalt-rubber behavior in the laboratory, using the criteria and tests required by the ASTM 8239/21 specification, in addition to fatigue resistance tests (LAS) and storage stability. A comparison was made between the rheological properties of a sample of commercial asphalt-rubber AB-08 and the properties of two 4th generation modifiers (PelletPAVE-Plus and PelletPAV) with CAP 50/70 in proportions of 20% and 30%, with respect to the binder’s total mass. The results obtained showed that the properties of the modified binders are superior to those of conventional asphalt, but inferior to those of conventional AB-08 asphalt rubber.
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