Permanent deformation behaviour of reinforced flexible pavements built on soft soil subgrade

2015 ◽  
Vol 17 (2) ◽  
pp. 311-327 ◽  
Author(s):  
Xiaochao Tang ◽  
Angelica M. Palomino ◽  
Shelley M. Stoffels
Keyword(s):  
Deformation Behaviour ◽  
Soft Soil ◽  
Permanent Deformation ◽  
Flexible Pavements

Mitigation of permanent deformation in base layer containing recycled asphalt aggregates

2013 ◽  
Vol 40 (2) ◽  
pp. 181-187 ◽  
Author(s):  
Jean-Pascal Bilodeau ◽  
Guy Doré ◽  
Jonas Depatie
Keyword(s):  
Asphalt Concrete ◽  
Deformation Behaviour ◽  
Permanent Deformation ◽  
Design Procedure ◽  
Base Layer ◽  
Repeated Loading ◽  
Recycled Asphalt ◽  
Thickness Increase ◽  
Permanent Strain ◽  
Pavement Base

The use of recycled asphalt pavement (RAP) aggregates as replacement for new materials in the pavement base weakens the layer in regards to the resistance to permanent deformation under repeated loading. A mechanistic based design procedure is proposed to ensure that base layers containing RAP particles have a similar rutting behaviour to base layers made of virgin aggregates. The design procedure allows calculating an asphalt concrete thickness increase that is based on permanent deformation behaviour of base materials. The calculation approach is based on multistage triaxial permanent deformation tests performed on granular material samples with varied RAP content. The tests allowed proposing an equation that relates permanent strain rate, RAP content, and deviatoric stress, which is the basis of the design procedure. Design charts are proposed to select adequate thickness increase for the asphalt concrete layer according to the expected RAP content in the base layer and asphalt concrete modulus.

Permanent Deformation Behaviour of Granular Materials

2005 ◽  
Vol 6 (1) ◽  
pp. 31-51 ◽  
Author(s):  
Sabine Werkmeister ◽  
Andrew R. Dawson ◽  
Frohmut Wellner
Keyword(s):  
Granular Materials ◽  
Deformation Behaviour ◽  
Permanent Deformation

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.

Mechanistic-empirical approach to characterizing permanent deformation of reinforced soft soil subgrade

2016 ◽  
Vol 44 (3) ◽  
pp. 429-441 ◽  
Author(s):  
Xiaochao Tang ◽  
Shelley M. Stoffels ◽  
Angelica M. Palomino
Keyword(s):  
Soft Soil ◽  
Permanent Deformation ◽  
Empirical Approach

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.

scholarly journals Characterisation of Permanent Deformation Behaviour of Asphalt Mix Based on a Combined Elastic Plastic (CEP) Parameter

2021 ◽  
Vol 6 (12) ◽  
pp. 183
Author(s):  
Abhirup B. Roy-Chowdhury ◽  
Mofreh F. Saleh ◽  
Miguel Moyers-Gonzalez
Keyword(s):  
Dynamic Modulus ◽  
Deformation Behaviour ◽  
Permanent Deformation ◽  
Asphalt Mixture ◽  
Asphalt Binders ◽  
Rheological Parameters ◽  
Elastic Plastic ◽  
Major Mode ◽  
Dynamic Creep ◽  
Asphalt Mix

Permanent deformation or rutting is a major mode of failure in Hot Mix Asphalt (HMA) pavements. The binder used in the asphalt mixture plays an important role in the rutting resistance performance of the mixture. Currently, the Superpave rutting parameter and a more advanced test called multiple stress creep and recovery (MSCR) are the most widely used tests for rutting characterisation of asphalt binders. However, they both have their own merits and demerits. This study was undertaken to introduce a combined Elastic-Plastic (CEP) parameter as an additional binder rheological rutting parameters. The study also aimed at investigating the applicability and potential of this parameter to supplement the existing binder rheological parameters to characterise the properties of asphalt binder related to HMA rutting performance. Additionally, the correlations of the binder rheological parameters with the asphalt mix rutting parameters generated by the dynamic creep and the dynamic modulus tests were investigated. For the polymer-modified binders, Styrene-Butadiene-Styrene (SBS) was added to the PG 70-16 binder at two concentration levels (4, and 6% by the mass of the binder). A dense-graded HMA AC 14 was tested in the Dynamic Modulus (DM) and Dynamic Creep (DC) tests for evaluating the rutting performance. The CEP parameter was found to be much more reliable than the traditional G*/sin (δ) and the non-recoverable creep compliance (Jnr) parameters for evaluating the rutting behaviour of polymer modified asphalt binders, evident from better correlations of CEP with the asphalt mix performance. Unlike Jnr, the CEP parameter revealed a wider range of values, which is comparable with asphalt mixture test results.

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