Evaluation of Geogrid-Reinforced Subbase Layer Thickness of Permeable Flexible Pavements based on Permanent Deformation Model

2015 ◽  
Vol 17 (1) ◽  
pp. 69-75
Author(s):  
Hyeok Min, Kwon ◽  
◽  
Jeongho, Oh ◽  
Shin-In, Han
Keyword(s):  
Layer Thickness ◽  
Permanent Deformation ◽  
Flexible Pavements ◽  
Deformation Model

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.

scholarly journals A simple permanent deformation model of rockfill materials

2018 ◽  
Vol 11 (4) ◽  
pp. 302-309 ◽  
Author(s):  
De-gao Zou ◽  
Jing-mao Liu ◽  
Xian-jing Kong ◽  
Chen-guang Zhou ◽  
Qing-po Yang
Keyword(s):  
Permanent Deformation ◽  
Deformation Model ◽  
Rockfill Materials

Determination of residual life in flexible pavements

1996 ◽  
Vol 23 (5) ◽  
pp. 1012-1024 ◽  
Author(s):  
Moshe Livneh
Keyword(s):  
Residual Life ◽  
Permanent Deformation ◽  
Flexible Pavements ◽  
Service Level ◽  
Rehabilitation Service ◽  
Basic Question ◽  
Pavement Rehabilitation ◽  
Structural Deterioration ◽  
Visual Testing ◽  
Life Parameter

In the field of pavement rehabilitation design, one finds a prominent absence of uniformity in the principles of calculation, a lack of clarity as to the testing methods, and a confusion of basic physical concepts. An example of this situation is the residual life of the pavement structure, which constitutes an important measure in the calculation of pavement bearing capacity. The basic question of how to establish such a parameter in practice is discussed in this paper by examining the relationships between the residual life parameter and the pavement surface state, the pavement structural state, the pavement functional state, and the effects of asphalt fatigue or the total structural deterioration on the residual life-span. Finally, this paper suggests a method for including the residual life parameter within the design process of flexible pavement rehabilitation. Key words: cracking, damages, deflection, permanent deformation, evaluation, fatigue, flexible pavements, overlay, rehabilitation, service level, visual testing.

Laboratory-based Unified Permanent Deformation Model for Hot-Mix Asphalt Mixtures

2007 ◽  
Vol 35 (3) ◽  
pp. 13153 ◽  
Author(s):  
M. R. Mitchell ◽  
R. E. Link ◽  
Elie Y. Hajj ◽  
Raj V. Siddharthan ◽  
Peter E. Sebaaly ◽  
...  
Keyword(s):  
Hot Mix Asphalt ◽  
Permanent Deformation ◽  
Asphalt Mixtures ◽  
Deformation Model

scholarly journals Methodology development and local calibration of MEPDG permanent deformation models for Ontario's flexible pavements.

2021 ◽  
Author(s):  
Afzal Waseem
Keyword(s):  
Permanent Deformation ◽  
Flexible Pavements ◽  
Field Evaluation ◽  
Pavement Performance ◽  
Layer By Layer ◽  
Local Calibration ◽  
Methodology Development ◽  
Design Guide ◽  
Level 3 ◽  
Deformation Models

The AASHTO-supported interim Mechanistic-Empirical Pavement Design Guide (MEPDG) was published in 2008 for trial use. However, local calibration of the empirical distress models in the design guide has been an essential exercise for any transportation agency before it formally adopts the MEPDG for practical design use. Nevertheless, a universally agreed upon local calibration methodology using historical pavement performance data from field evaluation has not been available. This research focuses on permanent deformation or rutting models in MEPDG and presents a layer-by-layer longitudinal local calibration process at the DARWin-METM platform coupled with Excel Macros. Using the best input data available, many of Level 3 accuracy, the study performs local calibration for 10 reconstructed and 19 rehabilitated flexible pavement sections. Further, this thesis statistically evaluated the level-3 pre-overlay rut value for rehabilitated flexible pavements in Ontario. A comparison of the longitudinal calibration and pooled local calibration demonstrated the importance of the longitudinal calibration in the quantification of uncertainties involved in local calibration.

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