ArticleScientific reports2025
Reinforcing bitumen with highly graphitized reduced graphene oxide derived from coal Tar pitch via template free sole step hydrothermal strategy.
Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
This study pioneers a cost-effective and scalable technique for preparing high-quality, highly-graphitized reduced graphene oxide (HG-RGO) from coal tar pitch (CTP), as an abundant aromatic precursor. The novelty lies in developing a one-pot, hard template-free hydrothermal method utilizing cetyltriethyl ammonium bromide (CTAB) at a moderate temperature, 270 °C to facilitate the formation of the desired nanostructure. Comprehensive microstructural analysis, utilizing XRD, FTIR, Raman spectroscopy, HR-TEM, and SAED patterns, confirmed the successful preparation of HG-RGO. This HG-RGO was then utilized to modify bitumen (penetration grade 80/100) at varying concentrations (1 wt%, 3 wt%, and 5 wt%) to create graphene-modified bitumen (GMB). The study meticulously assessed the impact of HG-RGO on the physical and mechanical properties of both the bitumen binder and the resulting asphalt mixtures. The results unequivocally demonstrate that HG-RGO acts as a potent modifier, effectively upgrading the soft bitumen pen grade 80/100 to the harder pen grade 60/70. Key physical property improvements were quantified: the Softening Point increased by 10 to 55 °C, the Penetration degree decreased by 17 to 68dmm, and Kinematic Viscosity increased by 200cSt to 550cSt.Furthermore, the HG-RGO significantly enhances the mechanical characteristics of the asphalt mixtures. The Marshall Stability reached a maximum of 2200 kg for the 5wt% GMB mixture, and the rutting depth decreased threefold compared to the unmodified binder, reaching just 5 mm for GMB5. Dynamic Mechanical Analyzer (DMA) results confirmed improved rutting resistance at high temperatures and enhanced fatigue performance, evidenced by decreased loss modulus. These findings suggest that HG-RGO can be successfully utilized as a modifier for soft bitumen for pavements like traditional bitumen pen grade 60/70.
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