Abstract
Bitumen in road pavement is susceptible to oxidative aging, which negatively impacts its performance and reduces its service life. While surface-modified silica nanoparticles (SNPs) with silane coupling agents have shown to be promising additives to delay oxidative aging of bitumen, silane coupling agent is a costly option for large scale construction projects. Herein we introduced a sustainable and economic bio-binder made from hydrothermal liquefaction of swine manure for surface functionalization of SNPs. The bio-binder functionalized SNPs (BB-SNPs) were characterized by scanning electron microscope (SEM), dynamic light scattering (DLS), Fourier-transform infrared spectroscopy (FTIR), and inverse gas chromatography (IGC). Efficacy of BB-SNPs to enhance performance of bitumen including anti-aging, rutting resistance, susceptibility to fatigue cracking and low-temperature properties at relatively high loading (4 wt%) was valuated under low shear rate (900 rpm), low temperature (135 °C) and short time (30 min) mixing and compared with those of pristine and silane functionalized SNPs. BB-SNPs demonstrated superior capability to delay aging of bitumen while being economically viable. The research outcome highlighted sustainable resource for chemical functionalization of SNPs to enhance bitumen performance for road surfacing and roofing.
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