Evaluation of fumaric copolymer/clays composites as base asphalt modifiers

Abstract Polymer‐modified asphalts (PMA) are known to improve pavement performance, but they have limitations, such as poor storage stability, oxidation susceptibility, low compatibility, and weak adhesion to mineral aggregates. To address these issues, recent studies have explored the use of nanomaterials to enhance asphalt properties. Particularly in this research, the specific polymer was designed to compatibilize with an Argentinian base asphalt. The copolymer shows 54% of alkyl fraction and 46% of aromatic fraction in its structure demonstrated by 1 H‐NMR and FTIR analyses. In addition, native bentonite and benzalkonium chloride‐modified organobentonite were employed as thermally stable asphalt modifiers suitable for this application. Fluorescence analysis determined that only 180 min were sufficient to achieve a homogeneous distribution of the modifiers on the samples. A comprehensive analysis of the rheological behavior as a function of temperature, combined with routine standardized rapid tests, led us to conclude that the incorporation of clays increases the hardness of the samples, which in turn improves their resistance to permanent deformation. This effect, although expected, also implies higher energy consumption during processing. Highlights Polymer was designed to compatibilize with base asphalt. Copolymer structure confirmed: 54% alkyl and 46% aromatic fractions by 1H‐NMR. Native and organobentonite enhance thermal stability and asphalt modification. Fluorescence analysis shows homogeneity achieved in 180 min. Clays increase hardness but reduce susceptibility to permanent deformation.