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To increase the resistance to permanent deformation of mastic asphalt mixtures while maintaining workability, the use of additives has become common practice. Latter include both plastomeric polymers as well as Fisher–Tropsch (FT) waxes, giving rise to morphologically complex binders. However, field experiences indicate that such mastic asphalt mixtures are prone to failure due to cracking shortly after its use on site. Hence, the impact of such additives on the binder performance was investigated. The research approach included an analysis by both thermal as well as rheological indices, aiming for the assessment of binders’ performance and identifying possible risks related to cracking. Findings from modulated DSC and DSR measurements are presented and discussed for both a paving grade bitumen 35/50 as well as blends, following modification with plastomer and/or FT-wax at different ageing stages. M-DSC results indicated that additives studied were incompatible with the bitumen matrix, therefore negatively affecting binder performance. Moreover, the determination of rheological indices identified risks of cracking failure associated with the combined use of plastomer and FT-wax.

Performance of modified bituminous binders for mastic asphalt applications: risk assessment by thermal and rheological indices