A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Assessment of Aging Behavior of Reclaimed Asphalt Binders Using Atomic Force Microscopy
https://orcid.org/https://orcid.org/0000-0003-1862-7293
In this study, the interaction between virgin and reclaimed asphalt pavement (RAP) binders was studied using atomic force microscopy (AFM). Binder blends incorporating different percentages of RAP binders (0%, 20%, 40%, and 100%) were subjected to a heating and cooling cycle (25 °C to 55 °C and back to 25 °C), and the changes in the microstructural and nanomechanical properties in this cycle were analyzed as an indication of aging. The peak force nanomechanical mapping (PFQNM) technique was used to study the binder’s topography, Derjaguin, Muller, Toropov (DMT) moduli, and adhesion. In the topography images, the “bee” structures appeared after adding RAP to the base binder (Pen 60–70), and their length increased with an increase in RAP content. The DMT moduli increased with an increase in RAP content. An aging index was calculated as the ratio of the modulus at the end of the thermal cycle (25 °C final) to the modulus at the initial temperature (25 °C initial). The 100% RAP residue had the least aging index. This is attributed to the fact that the RAP binder is already aged in the field and the thermal cycle in AFM had limited effect on aging it further. However, the aging index increased as the RAP content changed from 0% (base binder) to 40%. A possible explanation is that the amount of base binder exposed to the thermal cycle decreased as the RAP content increased. As such, the degree of aging of the base binder increased as its amount decreased.
Assessment of Aging Behavior of Reclaimed Asphalt Binders Using Atomic Force Microscopy
https://orcid.org/https://orcid.org/0000-0003-1862-7293
In this study, the interaction between virgin and reclaimed asphalt pavement (RAP) binders was studied using atomic force microscopy (AFM). Binder blends incorporating different percentages of RAP binders (0%, 20%, 40%, and 100%) were subjected to a heating and cooling cycle (25 °C to 55 °C and back to 25 °C), and the changes in the microstructural and nanomechanical properties in this cycle were analyzed as an indication of aging. The peak force nanomechanical mapping (PFQNM) technique was used to study the binder’s topography, Derjaguin, Muller, Toropov (DMT) moduli, and adhesion. In the topography images, the “bee” structures appeared after adding RAP to the base binder (Pen 60–70), and their length increased with an increase in RAP content. The DMT moduli increased with an increase in RAP content. An aging index was calculated as the ratio of the modulus at the end of the thermal cycle (25 °C final) to the modulus at the initial temperature (25 °C initial). The 100% RAP residue had the least aging index. This is attributed to the fact that the RAP binder is already aged in the field and the thermal cycle in AFM had limited effect on aging it further. However, the aging index increased as the RAP content changed from 0% (base binder) to 40%. A possible explanation is that the amount of base binder exposed to the thermal cycle decreased as the RAP content increased. As such, the degree of aging of the base binder increased as its amount decreased.
Assessment of Aging Behavior of Reclaimed Asphalt Binders Using Atomic Force Microscopy
https://orcid.org/https://orcid.org/0000-0003-1862-7293
In this study, the interaction between virgin and reclaimed asphalt pavement (RAP) binders was studied using atomic force microscopy (AFM). Binder blends incorporating different percentages of RAP binders (0%, 20%, 40%, and 100%) were subjected to a heating and cooling cycle (25 °C to 55 °C and back to 25 °C), and the changes in the microstructural and nanomechanical properties in this cycle were analyzed as an indication of aging. The peak force nanomechanical mapping (PFQNM) technique was used to study the binder’s topography, Derjaguin, Muller, Toropov (DMT) moduli, and adhesion. In the topography images, the “bee” structures appeared after adding RAP to the base binder (Pen 60–70), and their length increased with an increase in RAP content. The DMT moduli increased with an increase in RAP content. An aging index was calculated as the ratio of the modulus at the end of the thermal cycle (25 °C final) to the modulus at the initial temperature (25 °C initial). The 100% RAP residue had the least aging index. This is attributed to the fact that the RAP binder is already aged in the field and the thermal cycle in AFM had limited effect on aging it further. However, the aging index increased as the RAP content changed from 0% (base binder) to 40%. A possible explanation is that the amount of base binder exposed to the thermal cycle decreased as the RAP content increased. As such, the degree of aging of the base binder increased as its amount decreased.
Assessment of Aging Behavior of Reclaimed Asphalt Binders Using Atomic Force Microscopy
Carter, Alan (editor) / Vasconcelos, Kamilla (editor) / Dave, Eshan (editor) / Roja, K. Lakshmi (author) / Masad, Eyad (author)
International Symposium on Asphalt Pavement & Environment ; 2024 ; Montreal, QC, Canada
14th International Conference on Asphalt Pavements ISAP2024 Montreal ; Chapter: 88 ; 527-532
2024-12-24
6 pages
Article/Chapter (Book)
Electronic Resource
English
Investigation of microscale aging behavior of asphalt binders using atomic force microscopy
| Online Contents | 2017
Investigation of microscale aging behavior of asphalt binders using atomic force microscopy
| British Library Online Contents | 2017
| Taylor & Francis Verlag | 2019