Elucidación del mecanismo de compatibilidad molecular para guiar la optimización del asfalto derivado de paja

Área de la Ciencia:

• Materials Science; Chemical Engineering; Sustainable Development

Sus antecedentes:

• Growing demand for sustainable development drives interest in renewable asphalt additives.; Straw liquefied residue oil (SLRO) is a promising bio-based material for asphalt modification.; Understanding SLRO-asphalt compatibility and performance impacts is crucial.

Objetivo del estudio:

• To investigate the compatibility mechanisms between SLRO and asphalt.; To evaluate the impact of SLRO content on asphalt performance at different temperatures.; To elucidate the microscopic origins of performance trade-offs in bio-asphalt.

Principales métodos:

• Molecular dynamics (MD) simulations to model intermolecular interactions.; Multi-scale experimental techniques, including Dynamic Shear Rheometer (DSR) and Bending Beam Rheometer (BBR) tests.; Analysis of asphalt samples with varying SLRO content (up to 10 wt.%) after short-term and long-term aging.

Principales resultados:

• MD simulations showed increased intermolecular interactions and network cohesion peaking at 10 wt.% SLRO.; DSR tests confirmed improved high-temperature rutting resistance for 10% SLRO blends after short-term aging.; BBR tests revealed reduced low-temperature cracking resistance for 10% SLRO blends after long-term aging.

Conclusiones:

• The enhanced molecular network in SLRO-asphalt exhibits a dual effect on performance, improving rutting resistance while compromising cracking resistance.; Optimal SLRO content is context-dependent, requiring a balance between high- and low-temperature performance.; Findings provide a mechanistic basis for designing and optimizing sustainable bio-asphalts.