Warm-Mix Asphalt Moisture Susceptibility Evaluation for Mix Design and Quality Assurance

2016 ◽  
Vol 2575 (1) ◽  
pp. 39-47 ◽  
Author(s):  
Fan Yin ◽  
Amy Epps Martin ◽  
Edith Arámbula-Mercado
Keyword(s):  
Quality Assurance ◽  
Warm Mix Asphalt ◽  
Mix Design ◽  
Moisture Susceptibility ◽  
Susceptibility Evaluation

Effects of Asphalt Foaming on Damage Characteristics of Foamed Warm Mix Asphalt

2021 ◽  
pp. 036119812199782
Author(s):  
Biswajit K. Bairgi ◽  
Md Amanul Hasan ◽  
Rafiqul A. Tarefder
Keyword(s):  
Permanent Deformation ◽  
Warm Mix Asphalt ◽  
Creep Recovery ◽  
Deformation Model ◽  
Contact Method ◽  
Moisture Susceptibility ◽  
Viscoelastic Continuum Damage ◽  
Foamed Asphalt ◽  
Flexural Beam ◽  
Wheel Tracking

In the asphalt foaming process, the foaming water content (FWC) controls the formation and characteristics of water bubbles. These water bubbles are expected to be expelled from the foamed warm mix asphalt (WMA) during mixing and compaction. However, foaming water may not be completely expelled, rather some of the microbubbles may be trapped in the foamed WMA even after compaction. These microbubbles, or undissipated water, can diffuse over time and cause damage to the foamed WMA. To this end, this study has determined the effects of foaming on the fatigue, moisture damage, and permanent deformation characteristics of foamed WMA. Foamed asphalt and mixtures were designed with varying FWCs and they were tested using linear amplitude sweep, multiple stress creep recovery, four-point flexural beam, and Hamburg wheel tracking tests. Primarily, asphalt foaming dynamics were assessed with a laser-based non-contact method. A simplified viscoelastic continuum damage concept and a three-phase permanent deformation model were used for damage evaluation. The study reveals that foaming softens the binder, which results in slightly higher rutting and moisture susceptibility, though an equivalent or slightly improved fatigue characteristic compared with the regular hot mix asphalt.

Evaluation of Moisture Susceptibility Minimization Strategies for Warm-Mix Asphalt: Case Study

2016 ◽  
Vol 28 (2) ◽  
pp. 05015002 ◽  
Author(s):  
Lorena Garcia Cucalon ◽  
Fan Yin ◽  
Amy Epps Martin ◽  
Edith Arambula ◽  
Cindy Estakhri ◽  
...  
Keyword(s):  
Warm Mix Asphalt ◽  
Moisture Susceptibility

Moisture susceptibility evaluation of asphalt mixtures containing Evonik, Zycotherm and hydrated lime

2018 ◽  
Vol 165 ◽  
pp. 958-965 ◽  
Author(s):  
Mahmoud Ameri ◽  
Mostafa Vamegh ◽  
Seyed Farhad Chavoshian Naeni ◽  
Mohammad Molayem
Keyword(s):  
Hydrated Lime ◽  
Asphalt Mixtures ◽  
Moisture Susceptibility ◽  
Susceptibility Evaluation

Moisture susceptibility evaluation of RAP based foamed bituminous mix

2021 ◽  
pp. 332-337
Author(s):  
Lokesh Gupta* ◽  
Rakesh Kumar ◽  
Anupam Kumar
Keyword(s):  
Moisture Susceptibility ◽  
Susceptibility Evaluation

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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