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Characterization of nanoscale cracking at the interface between virgin and aged asphalt binders based on molecular dynamics simulations

Yaphary, Yohannes L.; Leng, Zhen; Wang, Haopeng; Ren, Shisong; Lu, Guoyang

Characterization of nanoscale cracking at the interface between virgin and aged asphalt binders based on molecular dynamics simulations Thumbnail


Authors

Yohannes L. Yaphary

Zhen Leng

Haopeng Wang

Shisong Ren

Guoyang Lu



Abstract

Low-temperature cracking is a major concern to improve the utilization of recycled asphalt mixture (RAM). A mechanism by which the crack propagates can provide a basis for advanced technological mitigation. Micro-crack formations in the interfacial proximity of the virgin and aged binders have been identified from electron microscopy tests. Atomic force microscopy (AFM) experiment showed the trilayer phases at the virgin-aged binder interface. In this study, molecular dynamics (MD) simulations were conducted to understand the nanoscopic crack propagation characteristics at the virgin-aged binder interface in the asphalt mixture with RAM. It was found that the blended binder of virgin and aged binders, and its interfaces with virgin and aged binders appeared to be the crack propagation zones. The relatively more significant matrix contraction of virgin binder and stiffer aged binder at a low temperature can cause more considerable tensile stress at the blended binder and its interfaces. Consequently, interfacial crack propagation became more profound and decreased the low-temperature cracking resistance.

Journal Article Type Article
Acceptance Date Apr 9, 2022
Online Publication Date Apr 18, 2022
Publication Date Jun 13, 2022
Deposit Date Nov 22, 2022
Publicly Available Date Apr 19, 2023
Journal Construction and Building Materials
Print ISSN 0950-0618
Publisher Elsevier BV
Peer Reviewed Peer Reviewed
Volume 335
Article Number 127475
DOI https://doi.org/10.1016/j.conbuildmat.2022.127475
Keywords General Materials Science; Building and Construction; Civil and Structural Engineering
Public URL https://nottingham-repository.worktribe.com/output/14031696
Publisher URL https://www.sciencedirect.com/science/article/pii/S0950061822011527?via%3Dihub

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