A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Surface nanomechanical properties of bio-modified reclaimed asphalt binder
In this work, three different bio-based rejuvenators were added to the reclaimed asphalt pavement (RAP) binder: a vegetable oil, a cashew nut shell oil and a tall oil. To better understand the microstructural morphology, atomic force microscopy (AFM) was used before and after aging. Quantitative nanomechanical mapping (QNM) showed how the addition of rejuvenators affected the surface elastic moduli of RAP. Changes of the microstructure in modified RAP binders as a function of aging treatments were seen. Generally, the microstructures show four domains topographically, while two distinct domains are present in the phase image. It has been observed that these two different domains correspond to zones with different mechanical properties. Comparison between the “bees” surface’s elastic moduli and the bulk elastic moduli for a virgin bitumen showed that surface’s moduli were consistently higher than the bulk moduli contributing to the formation of the “bee” structures. “Bees” were observed to be composed of periodic ripples with a wavelength in the order of 400 nm for the aged virgin binder and 600 nm for the unaged one while amplitude equal to 8 and 15 nm for the aged and unaged case respectively. The results presented in this paper contribute to an improved understanding of the link between surface and bulk properties of bitumen.
Surface nanomechanical properties of bio-modified reclaimed asphalt binder
In this work, three different bio-based rejuvenators were added to the reclaimed asphalt pavement (RAP) binder: a vegetable oil, a cashew nut shell oil and a tall oil. To better understand the microstructural morphology, atomic force microscopy (AFM) was used before and after aging. Quantitative nanomechanical mapping (QNM) showed how the addition of rejuvenators affected the surface elastic moduli of RAP. Changes of the microstructure in modified RAP binders as a function of aging treatments were seen. Generally, the microstructures show four domains topographically, while two distinct domains are present in the phase image. It has been observed that these two different domains correspond to zones with different mechanical properties. Comparison between the “bees” surface’s elastic moduli and the bulk elastic moduli for a virgin bitumen showed that surface’s moduli were consistently higher than the bulk moduli contributing to the formation of the “bee” structures. “Bees” were observed to be composed of periodic ripples with a wavelength in the order of 400 nm for the aged virgin binder and 600 nm for the unaged one while amplitude equal to 8 and 15 nm for the aged and unaged case respectively. The results presented in this paper contribute to an improved understanding of the link between surface and bulk properties of bitumen.
Surface nanomechanical properties of bio-modified reclaimed asphalt binder
Cavalli, M. C. (author) / Mazza, E. (author) / Zaumanis, M. (author) / Poulikakos, L. D. (author)
Road Materials and Pavement Design ; 22 ; 1407-1423
2021-06-03
17 pages
Article (Journal)
Electronic Resource
Unknown
RAP , rejuvenators , AFM , elastic moduli , bee structures
Asphalt and binder evaluation of asphalt mix with 70% reclaimed asphalt
| Taylor & Francis Verlag | 2017
| Taylor & Francis Verlag | 2022
| British Library Online Contents | 2016