PT  - JOURNAL ARTICLE
AU  - Najfabadi, Sajad Chavoshi
AU  - Khabiri, Mohammad Mehdi
AU  - Sanij, Hamed Khani
TI  - Investigating the Characteristics of Modified Bitumen with Polyphosphoric Acid Polymers and Recycled Rubber
DP  - 2024 Oct 1
TA  - Communications - Scientific Letters of the University of Zilina
PG  - D109--D121
VI  - 26
IP  - 4
AID - 10.26552/com.C.2024.050
IS  - 13354205
AB  - The impact of polyphosphoric acid (PPA) polymers and crumb rubber (CR) on bitumen's properties to enhance its performance was examined in this study. Laboratory samples were created with varying percentages of PPA (0.5 % to 2 %) and CR (6 % to 18 %) and subjected to extensive testing. Findings indicated that the combination of PPA and CR led to notable improvements in bitumen performance, including increased viscosity, softening point, elasticity, and recovery rates at elevated temperatures. Specifically, samples with 18 % CR and 1.0 % or 2.0 % PPA demonstrated exceptional rheological properties and strength. The optimal combination (18% CR and 1.0% PPA) resulted in a uniform structure, while the maximum CR content did not compromise bitumen integrity. Both additives effectively minimized temperature sensitivity and aging, enhancing the bitumen's performance class significantly.