Speaker
Description
Abstract. This study was conducted to assess the time evolution of the lin-ear viscoelastic behaviour of bituminous mixtures containing crumb rubber added by dry process. For this purpose, three mixtures containing 0% or 4% of rubber and with neat 35/50 pen grade or SBS-modified bitumen were manufactured and stored for 15 months before being subjected to complex modulus tests. The results were compared to those obtained from a previous study that investigated the linear viscoelastic behaviour of identical mate-rials but tested shortly after their production. The outcomes reveal no sig-nificant evolution for mixtures with neat 35/50 pen grade bitumen and 4% of crumb rubber. However, a potential evolution (ageing or bitumen-rubber interaction) is observed for mixtures with 4% of crumb rubber and SBS-modified bitumen. This study provides valuable insights into the long-term performance of rubber-modified bituminous mixtures, highlighting the need for further investigation into the factors influencing the material's behav-iour over time.
