Morphology, rheology and physical properties investigations of multi-scale nano-zinc oxide modified asphalt binder

Zhu, Quping; He, Zhaoyi; Wang, Jinneng; Wang, Shu

doi:10.1016/j.aej.2023.12.031

Cited by 1 publication

(2 citation statements)

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“…Di et al [16], based on liquid-state nuclear magnetic resonance (NMR) spectroscopy tests, report an increase in the percentage of aromatic carbon in an asphalt binder when ZnO is used as a modifier to explain the increase in thermo-oxidative resistance. According to Zhu et al [40], performing Fourier-Transform Infrared Spectroscopy (FTIR) tests, nano-ZnO modified binders show lower carbonyl and sulfoxide ratios after the aging of RTFO and PAV relative to the unmodified binder. On the other hand, an increase in MT generates the greater oxidation and aging of the samples due to the longer exposure time to which the binders are subjected to high temperatures [55], which could promote the increase in the asphaltenes fraction and the asphaltenes/resins ratio, as well as the decrease in the aromatics content [56,57].…”

Section: Modified Asphalt Properties and Aging Assessmentmentioning

confidence: 99%

“…The optimum nano-TiO 2 /ZnO content was 4 wt%. [40] evaluated the influence of ZnO nanometer size (10-30 nm, 50-70 nm, 100-200 nm) on the morphology, rheological, physical properties, and aging resistance of an AC (PG 64-22) modified with ZnO concentrations of 1, 3, and 5 wt%. ZnO improved the binder elastic performance and rutting resistance.…”

Section: Introductionmentioning

confidence: 99%

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Aging Resistance Evaluation of an Asphalt Mixture Modified with Zinc Oxide

Rondón-Quintana,

Zafra-Mejía,

Urazán-Bonells

2024

Infrastructures

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The phenomenon of the oxidation and aging of asphalt binders affects the strength and durability of asphalt mixtures in pavements. Several studies are trying to improve the resistance to this phenomenon by modifying the properties of the binders with nano-particles. One material that shows promise in this field is zinc oxide (ZnO), especially in improving ultraviolet (UV) aging resistance. Few studies have evaluated the effect of these nano-particles on the thermo-oxidative resistance of asphalt binders, and, on hot-mix asphalt (HMA), studies are even more scarce and limited. Therefore, in the present study, the resistance to thermo-oxidative aging of an HMA manufactured with an asphalt binder modified with ZnO was evaluated. An asphalt cement (AC 60–70) was initially modified with 0, 1, 3, 5, 7.5, and 10% ZnO (percentage by weight of asphalt binder; ZnO/AC in wt%), and then exposed to aging in Rolling Thin-Film Oven tests (RTFOT) and a Pressure Aging Vessel (PAV). Penetration, viscosity, and softening point tests were performed on these binders, and aging indices were calculated and evaluated. Samples of HMAs were then manufactured using these binders and designed by the Marshall method, determining the optimum asphalt binder content (OAC) and the optimum ZnO/AC ratio. Control (unmodified) and modified HMA were subjected to short-term oven aging (STOA) and long-term oven aging (LTOA) procedures. Marshall, Indirect Tensile Strength (ITS), and resilient modulus (RM) tests were performed on these mixtures. LTOA/STOA results of the parameters measured in these tests were used as aging indices. In this study, ZnO was shown to increase the thermo-oxidative aging resistance of the asphalt binder and HMA. It also contributed to an increase in the resistance under monotonic loading in the Marshall and ITS tests, and under repeated loading in RM test. Likewise, it contributed to a slightly increasing resistance to moisture damage. The best performance is achieved using ZnO/AC = 5 wt%.

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