Modifying bitumens to improve their characteristics is one of the ways to increase road pavement durabilityreducing maintenance costs and environmental issues. In this study the structural and mechanical characteristicsof a 50/70 bitumen modified by two different char samples are presented. The choice of char as bitumen modifierfulfils the recent needs for environmental protection. The two char samples come from the pyrolysis of RefuseDerived Fuel (RDF) and waste tyres (WT), respectively. They differ in composition and morphology and theirproduction took place with different yields. Char-modified bitumens revealed increased shear modulus andresistance to mechanical stress as found by rheometry. Artificial aging of these char-modified bitumens unveiledthat the bitumen modified by char from WT (WT-char) possessed a certain resilience against aging, with areduced increase in rigidity upon aging. The anti-aging effect showed by WT-char was attributed to its higher carbon content, which confers higher compatibility with the bitumen chemical nature and presumably a moreuniform dispersion within the bituminous structure thanks to the establishment of more effective interactions.
How char from waste pyrolysis can improve bitumen characteristics and induce anti-aging effects
Valentina Gargiulo;Michela Alfe';Giovanna Ruoppolo;Francesco Cammarota;Pietro Calandra;
2023
Abstract
Modifying bitumens to improve their characteristics is one of the ways to increase road pavement durabilityreducing maintenance costs and environmental issues. In this study the structural and mechanical characteristicsof a 50/70 bitumen modified by two different char samples are presented. The choice of char as bitumen modifierfulfils the recent needs for environmental protection. The two char samples come from the pyrolysis of RefuseDerived Fuel (RDF) and waste tyres (WT), respectively. They differ in composition and morphology and theirproduction took place with different yields. Char-modified bitumens revealed increased shear modulus andresistance to mechanical stress as found by rheometry. Artificial aging of these char-modified bitumens unveiledthat the bitumen modified by char from WT (WT-char) possessed a certain resilience against aging, with areduced increase in rigidity upon aging. The anti-aging effect showed by WT-char was attributed to its higher carbon content, which confers higher compatibility with the bitumen chemical nature and presumably a moreuniform dispersion within the bituminous structure thanks to the establishment of more effective interactions.File | Dimensione | Formato | |
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