Micromechanical Model for Heterogeneous Asphalt Concrete Mixtures Subjected to Fracture Failure

Aragão, Francisco Thiago Sacramento; Kim, Yong-Rak; Lee, Jung-Hun; Allen, David H.

doi:10.1061/(asce)mt.1943-5533.0000004

Cited by 92 publications

(20 citation statements)

References 25 publications

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“…However, the true fracture properties of asphalt mixtures could be misled by as much as an order of magnitude because the material responses captured by the extensometers or clip-on gauges are limited to accurately represent material behavior at the actual FPZ. This discrepancy can become worse if the material is highly heterogeneous and inelastic [9,10], which is typical in asphaltic paving materials. In addition, most of the studies have adopted low-temperature testing conditions in which the type of fracture is much more brittle than it should be to accurately characterize fracture behavior such as fatigue cracking observed at intermediate service temperatures.…”

Section: Introductionmentioning

confidence: 99%

Rate- and Temperature-Dependent Fracture Characteristics of Asphaltic Paving Mixtures

Kim

Ban

2013

Journal of Testing and Evaluation

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Cracking in asphaltic pavement layers causes primary failure of the roadway structure, and the fracture resistance and characteristics of asphalt mixtures significantly influence the service life of asphaltic roadways. A better understanding of the fracture process is considered a necessary step to the proper development of design-analysis procedures for asphaltic mixtures and pavement structures. However, such effort involves many challenges because of the complex nature of asphaltic materials. In this study, experiments were conducted using uniaxial compressive specimens to characterize the linear viscoelastic properties and semi-circular bending (SCB) specimens to characterize fracture behavior of a typical dense-graded asphalt paving mixture subjected to various loading rates and at different temperatures. The SCB fracture test was also incorporated with a digital image correlation (DIC) system and finite-element model simulations including material viscoelasticity and cohesive-zone fracture to effectively capture local fracture processes and resulting fracture properties. The test results and model simulations clearly demonstrate that: (1) the rate-and temperature-dependent fracture characteristics need to be identified at the local fracture process zone, and (2) the rate-and temperature-dependent fracture properties are necessary in the structural design of asphaltic pavements with which a wide range of strain rates and service temperatures is usually associated.

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Section: Introductionmentioning

confidence: 99%

Rate- and Temperature-Dependent Fracture Characteristics of Asphaltic Paving Mixtures

Kim

Ban

2013

Journal of Testing and Evaluation

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“…In summary, using (i) the linear elastic properties of aggregate particles, (ii) the linear viscoelastic properties of asphalt matrix phase, and (iii) the cohesive zone fracture properties as inputs for the FEM model, Aragão et al (2011) obtained good correlations between predicted and experimental values.…”

Section: Literature Reviewmentioning

confidence: 86%

Evaluation of the fatigue damage behavior of fine aggregate matrices prepared with modified asphalt binders

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ACKNOWLEDGEMENTSPrimeiramente gostaria de agradecer aos meus pais Ng Chi Wai e Jussara Ng pelo apoio durante a minha formação acadêmica e por estarem presente mesmo estando longe. Os senhores sempre deram o devido valor para a nossa educação não medindo esforços para que tivéssemos uma boa formação. Serei eternamente grata pela dedicação de vocês. Amo vocês.Ao meu orientador, professor Adalberto Leandro Faxina, pelo enorme aprendizado durante o doutorado e pela orientação durante o desenvolvimento deste trabalho. Também a sua esposa Marcia Guidini Faxina e seu filho Ettore Guidini Faxina, por me acolherem como parte da família no período em que moramos em Austin, TX e pelos bons momentos que passamos juntos.As agências de fomento CNPq pela bolsa de doutorado (870343/1997-1) e a CAPES pela bolsa de doutorado sanduíche no exterior (BEX: 6394-15-9).Aos professores Glauco Tulio Pessa Fabbri e Verônica Castelo Branco pelas contribuições feitas no meu exame de qualificação.To Dr. Amit Bhasin for the opportunity to work in your research group at the University of Texas at Austin, US. I learned much more than I expected during the period that I worked with you. Thank you so much for your patience and for the opportunity. O processo de trincamento por fadiga ocorre devido ao carregamento dinâmico repetido do tráfego de veículos pesados. Este fenômeno tem o início por meio de microtrincas e se propaga por meio de duas condições: (i) após a ruptura adesiva, quando a trinca ocorre na interface entre agregado e mástique, e/ou (ii) após a ruptura coesiva, quando o processo de trincamento ocorre no mástique. Com base nesta interpretação para o trincamento por fadiga em mistura asfáltica, pesquisadores vêm usando matrizes de agregado fino (MAFs) para estimar o comportamento da mistura asfáltica completa quanto ao dano por fadiga. Boa correlação é observada entre as propriedades da MAF e da mistura asfáltica completa (MAC) em estudos relacionados ao dano por umidade, fadiga e deformação permanente. Com relação a resistência de pavimentos flexíveis, é importante avaliar o efeito do uso de ligantes asfálticos modificados e do envelhecimento do ligante nas propriedades da mistura asfáltica, uma vez que ligantes modificados podem melhorar o comportamento da mistura asfáltica quanto ao dano por fadiga, e o envelhecimento do ligante asfáltico pode enrijecer o material tornando-o mais frágil, reduzindo a vida de fadiga das misturas asfálticas. Levando em consideração as evidências apresentadas, este estudo tem por objetivo avaliar o efeito de ligantes asfálticos modificados e o nível de envelhecimento na vida de fadiga das MAFs, mástiques e ligantes asfálticos. Estas três escalas da mistura asfáltica completa foram compostas por quatro ligantes asfálticos (CAP 50/70, CAP+PPA, CAP+SBS e CAP+borracha) envelhecidos a curto e a longo prazo. As propriedades das três escalas quanto ao dano por fadiga foram avaliadas por meio dos conceitos da teoria do dano contínuo em meio viscoelástico (VECD), uma vez que esta teoria é capaz de prever o com...

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“…Aggregates are the main phases in such transportation infrastructure, and, therefore, it is significant to accurately estimate their mechanical properties to reach better design and performance analysis of the various transportation infrastructure systems. In particular, in recent times, micromechanical approaches have been actively studied [1][2][3][4][5] because they offer various advancements over conventional phenomenological approaches. Micromechanical approaches have demonstrated that mixture properties are directly affected by accuracy of component properties.…”

Section: Introductionmentioning

confidence: 99%

“…For example, asphalt mixtures in pavements are usually modeled as heterogeneous composites of two distinct phases-elastic aggregates and viscoelastic matrix-to predict their overall stiffness and fracture characteristics. Zhou et al [6] and Aragão et al [5] have shown that the elastic modulus of aggregates significantly influences the overall stiffness and strength of mixtures. However, despite the importance of the accurate measurement of the aggregate mechanical properties, suitable test methods for this purpose have not yet been actively explored.…”

Section: Introductionmentioning

confidence: 99%

Nanoindentation Test Integrated with Numerical Simulation to Characterize Mechanical Properties of Rock Materials

Ban

Karki

Kim

2014

Journal of Testing and Evaluation

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It is important to determine the mechanical properties of rock materials accurately from the viewpoint of the design, analysis, and modeling of various transportation infrastructure systems. Conventional methods have some drawbacks, including relatively inaccurate measurements, cumbersome testing-analysis processes, and high variability in measurements. A nanoindentation test integrated with a numerical modeling technique has been validated in other fields as an efficient and accurate tool for the characterization of the key mechanical properties of various irregularly shaped materials, such as the rock materials in this study. This paper presents an integrated experimental-numerical effort based on the nanoindentation measurement and finite-element modeling of a representative rock material, limestone. The experimental efforts, including specimen fabrication and laboratory tests, are presented, and the corresponding analyses of test results combined with the finite-element technique and linear interpolation to evaluate the property measurements are discussed. The elastic properties estimated from the nanoindentation test are similar to the simulation results, demonstrating the validity of the test method and modeling approach.The success of the proposed approach should facilitate the better design of mixtures and structures based on the more accurate characterization of the core material properties.

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Micromechanical Model for Heterogeneous Asphalt Concrete Mixtures Subjected to Fracture Failure

Cited by 92 publications

References 25 publications

Rate- and Temperature-Dependent Fracture Characteristics of Asphaltic Paving Mixtures

Rate- and Temperature-Dependent Fracture Characteristics of Asphaltic Paving Mixtures

Evaluation of the fatigue damage behavior of fine aggregate matrices prepared with modified asphalt binders

Nanoindentation Test Integrated with Numerical Simulation to Characterize Mechanical Properties of Rock Materials

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