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Reliability-based Design Procedure for Flexible Pavements
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering. (Infrastructure Engineering)ORCID iD: 0000-0001-7174-7214
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Load induced top-down fatigue cracking has been recognized recently as a major distress phenomenon in asphalt pavements. This failure mode has been observed in many parts of the world, and in some regions, it was found to be more prevalent and a primary cause of pavements failure. The main factors which are identified as potential causes of top down fatigue cracking are primarily linked to age hardening, mixtures fracture resistance and unbound layers stiffness. Mechanistic Empirical analytical models, which are based on hot mix asphalt fracture mechanics (HMA-FM) and that could predict crack initiation time and propagation rate, have been developed and shown their capacity in delivering acceptable predictions. However, in these methods, the effect of age hardening and healing is not properly accounted and moreover, these models do not consider the effect of mixture morphology influence on long term pavement performance. Another drawback of these models is, as analysis tools they are not suitable to be used for pavement design purpose. The main objective of this study is to develop a reliability calibrated design framework in load resistance factor design (LRFD) format which could be implemented to design pavement sections against top down fatigue cracking.

For this purpose, asphalt mixture morphology based sub-models were developed and incorporated to HMA-FM to characterize the effect of aging and degradation on fracture resistance and healing potential. These sub-models were developed empirically exploiting the observed relation that exist between mixture morphology and fracture resistance. The developed crack initiation prediction model was calibrated and validated using pavement sections that have high quality laboratory data and observed field performance history. As traffic volume was identified in having a dominant influence on predicted performance, two separate model calibration and validation studies were undertaken based on expected traffic volume. The predictions result for both model calibration and validation was found to be in an excellent agreement with the observed performance in the field.

A LRFD based design framework was suggested that could be implemented to optimize pavement sections against top-down fatigue cracking. To achieve this objective, pavement sections with various design target reliabilities and functional requirements were analyzed and studied.  A simplified but efficient limit state equation was generated using a central composite design (CCD) based response surface methodology, and FORM based reliability analysis was implemented to compute reliabilities and formulate associated partial safety factors. A design example using the new partial safety factors have clearly illustrated the potential of the new method, which could be used to supplement existing design procedures.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. , x, 20 p.
Series
TRITA-JOB. LIC, ISSN 1650-951X ; 2027
Keyword [en]
Top-Down fatigue cracking, asphalt mixture morphology, fracture mechanics, response surface, reliability analysis, load resistance factor design
National Category
Infrastructure Engineering
Research subject
Civil and Architectural Engineering
Identifiers
URN: urn:nbn:se:kth:diva-165280OAI: oai:DiVA.org:kth-165280DiVA: diva2:807836
Presentation
2015-05-08, B23, Brinellvägen 23, KTH, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

QC 20150427

Available from: 2015-04-27 Created: 2015-04-24 Last updated: 2015-04-27Bibliographically approved
List of papers
1. Mechanics-based Topdown Fatigue Cracking Initiation Prediction Framework for Asphaltic Pavements
Open this publication in new window or tab >>Mechanics-based Topdown Fatigue Cracking Initiation Prediction Framework for Asphaltic Pavements
2015 (English)In: International Journal on Road Materials and Pavement Design, ISSN 1468-0629, E-ISSN 2164-7402, Vol. 16, no 4Article in journal (Refereed) Published
Abstract [en]

In this paper, a new mechanics-based top-down fatigue cracking analysis framework is presented for asphalt pavements. A new mixture morphology-based set of material sub-models is presented for characterising key mixture properties and their change over time. Predicting the load induced top-down fatigue crack initiation (CI) time by utilising comprehensive mixture properties creates the possibility of optimising the mixture morphology while taking into account its subsequent effect on long-term pavement performance. The new framework was calibrated and subsequently validated against a number of field pavement sections with varying traffic levels that are representative for current practices and which have a wide range in material properties. The framework accounts the change in key mixture properties due to ageing and mixture-healing effect on damage accumulation while determining the overall effect of design inputs on cracking performance. Model calibration and validation were achieved based on the healing potential of the asphalt mixture. It was found out that the CI predictions for all the sections are in general agreement with the observed performance in the field, thus giving credibility for the framework.

Place, publisher, year, edition, pages
Taylor & Francis, 2015
National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:kth:diva-164887 (URN)10.1080/14680629.2015.1055335 (DOI)
Note

QC 20161220

Available from: 2015-04-20 Created: 2015-04-20 Last updated: 2017-12-04Bibliographically approved
2. Reliability-based calibration for a mechanics-based fatigue cracking design procedure
Open this publication in new window or tab >>Reliability-based calibration for a mechanics-based fatigue cracking design procedure
2016 (English)In: International Journal on Road Materials and Pavement Design, ISSN 1468-0629, E-ISSN 2164-7402, Vol. 17, no 3, 529-546 p.Article in journal (Other academic) Published
Abstract [en]

This paper presents a new reliability-based code calibration in load resistance factor design (LRFD) format for the mechanics-based fatigue cracking analysis framework. The pavement design procedure incorporates an appropriate failure criterion and design period. Moreover, it provides uniform performance at the desired level of reliability while considering the inherent variabilities and uncertainties involved. A number of field pavement sections with well documented performance histories and high quality field and laboratory data were used for this purpose. Moreover, a reliability computation methodology that incorporates a central composite design (CCD) response surface approach (RS) is proposed. Appropriate statistical characterization of the dominant design parameters was performed considering its key role in reliability analysis. A first order reliability method (FORM) was used to compute pavement performance reliability and to establish the partial safety factors of the design procedure. Illustrative examples based on the developed LRFD procedure have demonstrated clearly its capacity of delivering designs with uniform reliability.

Place, publisher, year, edition, pages
Taylor & Francis, 2016
Keyword
LRFD, top-down cracking, pavement design, CCD, response surface, FORM
National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:kth:diva-165276 (URN)10.1080/14680629.2015.1094397 (DOI)000379747600001 ()2-s2.0-84976334795 (Scopus ID)
Note

QC 20160818

Available from: 2015-04-24 Created: 2015-04-24 Last updated: 2017-12-04Bibliographically approved

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Licentiate Thesis(328 kB)571 downloads
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