Finite element viscoelastic simulations of rutting behavior of hot mix and warm mix asphalt overlay on flexible pavements

2021 ◽  
Vol 14 (6) ◽  
pp. 708-719
Author(s):  
Hossein Alimohammadi ◽  
Junxing Zheng ◽  
Ashley Buss ◽  
Vernon R. Schaefer ◽  
Christopher Williams ◽  
...  
Keyword(s):  
Finite Element ◽  
Flexible Pavements ◽  
Warm Mix Asphalt ◽  
Asphalt Overlay ◽  
Rutting Behavior

Finite-Element Evaluations of Geogrid-Reinforced Asphalt Overlays over Flexible Pavements

2018 ◽  
Vol 144 (2) ◽  
pp. 04018020 ◽  
Author(s):  
N. S. Correia ◽  
E. R. Esquivel ◽  
J. G. Zornberg
Keyword(s):  
Finite Element ◽  
Flexible Pavements ◽  
Asphalt Overlays

High-Performance Thin-Lift Overlays with High Reclaimed Asphalt Pavement Content and Warm-Mix Asphalt Technology

2012 ◽  
Vol 2293 (1) ◽  
pp. 18-28 ◽  
Author(s):  
Walaa S. Mogawer ◽  
Alexander J. Austerman ◽  
Robert Kluttz ◽  
Michael Roussel
Keyword(s):  
High Performance ◽  
Asphalt Pavement ◽  
Warm Mix Asphalt ◽  
Asphalt Binders ◽  
Reclaimed Asphalt Pavement ◽  
Moisture Susceptibility ◽  
Reclaimed Asphalt ◽  
Pavement Preservation ◽  
Asphalt Overlay ◽  
Structural Capacity

A high-performance thin asphalt overlay (HPThinOL) is specified as having a thickness of 1 in. or less and is used in applications requiring high levels of rutting and fatigue resistance. HPThinOLs are used as a pavement preservation strategy and are placed on pavements that have remaining structural capacity that is expected to outlive that strategy. Current specifications for HPThinOLs generally call for a polymer-modified asphalt (PMA). However, PMA binders are more expensive than unmodified asphalt binders. This expense, coupled with the higher binder content requirement generally associated with HPThinOL, could lead to an initial higher cost in relation to other pavement preservation strategies. Although the higher initial cost can be offset by incorporating high amounts of reclaimed asphalt pavement (RAP), the use of high amounts of RAP in PMA mixtures might adversely affect the mixture performance (stiffness, cracking, or workability). Warm-mix asphalt (WMA) technology may improve the workability of HPThinOL that incorporates high RAP content and PMA binders. This study evaluated the effect of PMA binders, high RAP content, and WMA technology on the stiffness, resistance to reflective cracking, moisture susceptibility, and workability of HPThinOL mixtures. PMA binders and high RAP content increased the stiffness of HPThinOL significantly; however, the use of WMA technology lowered mixture stiffness and improved workability. PMA may improve the cracking resistance, moisture susceptibility, and rutting resistance of high-RAP HPThinOL mixtures, depending on whether a WMA technology is used.

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