Observation of Crack Propagation in Asphalt Mixtures with Acoustic Emission

Li, Xue; Marasteanu, Mihai; Iverson, Nathan; Labuz, Joseph F.

doi:10.3141/1970-20

Cited by 12 publications

(4 citation statements)

References 10 publications

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“…A number of studies in recent years have demonstrated that fracture in asphalt concrete is a highly non-linear phenomenon, typically characterized as quasibrittle behavior. This has been demonstrated through modeling , and through laboratory experiments (Wagoner et al 2005;Li et al 2006) amongst others.…”

Section: Introductionmentioning

confidence: 94%

Thermal Cracking Prediction Model and Software for Asphalt Pavements

Dave

Leon

Park

2011

Transportation and Development Institute Congress 2011

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Thermally induced cracking in asphalt pavements remains to be one of the prominent distress mechanisms in regions with cooler climates. At present, the AASHTO Mechanistic-Empirical Pavement Design Guide (MEPDG) is the most widely deployed pavement analysis and design procedure. For thermal cracking predictions, MEPDG utilizes a simplified one-dimensional stress evaluation model with a simple Paris-law (i.e. linear elastic fracture mechanics) based crack propagation procedure. The user-friendly graphical interface for MEPDG makes it an attractive design procedure of choice, however, the over simplicity of the model and lack of a physicsbased representation to accurately capture the nonlinear fracture behavior of ratedependent asphalt concrete reduce(s) the reliability of predictions. This study presents an interactive thermal cracking prediction model that utilizes a nonlinear finite element based thermal cracking analysis engine which can be easily employed using a user-friendly graphical interface. The analysis engine is comprised of (1) the cohesive zone fracture model for accurate simulation of crack initiation and propagation due to thermal loading and (2) the viscoelastic material model for time and temperature dependent bulk material behavior. The graphical user interface (GUI) is designed to be highly interactive and user-friendly in nature, and features screen layouts similar to those used in the AASHTO MEPDG, thus minimizing transition time for the user. This paper describes the individual components of the low temperature cracking prediction software (called LTC Model) including details on the graphical user interface, viscoelastic finite element analysis, cohesive zone fracture model, and integration of various software components for thermal cracking predictions.

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Section: Introductionmentioning

confidence: 94%

Thermal Cracking Prediction Model and Software for Asphalt Pavements

Dave

Leon

Park

2011

Transportation and Development Institute Congress 2011

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“…They concluded that the Styrene-ButadieneStyrene (SBS)-modified mixes produced less AE activity than unmodified mixes. Li et al [24][25][26][27][28] used AE techniques to characterize fracture in semi-circular bend asphalt specimens at low temperatures A great deal of research efforts has been directed towards the characterization and prevention of thermal cracks in pavement. The Superpave tests developed under the Strategic Highway Research Program (SHRP) in the 1990s have significantly improved the performance tests to assess the behavior of asphalt pavements by providing fundamental material tests over a broad range of production and service temperatures.…”

Section: Thermal Cracksmentioning

confidence: 99%

“…However, the Superpave tests were not developed for (1) the characterization of highly modified binders, (2) the characterization of asphalt pavements containing recycled materials such as Reclaimed Asphalt Pavement (RAP) or Reclaimed Asphalt Shingles (RAS), and (3) the characterization of warm-mix materials. In addition to Superpave performance tests [8][9][10][11][12], studies conducted by several researchers [7,[13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] also provide valuable and significant insight into the estimation of asphalt materials low-temperature performance.…”

Section: Thermal Cracksmentioning

confidence: 99%

“…They concluded that the Styrene-Butadiene-Styrene (SBS)-modified mixes produced less AE activity than unmodified mixes. Li et al [24][25][26][27][28] used AE techniques to characterize fracture in semi-circular bend asphalt specimens at low temperatures (−20 • C). They also concluded that large amounts of accumulated AE events occur at 70% of material strength, that the maximum intensity of AE peaks correlates with the development of macro-cracks, and that the location of AE events suggests that a several centimeter-sized process zone forms before the peak load.…”

Section: Thermal Cracksmentioning

confidence: 99%

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Evaluation of Low-Temperature Cracking Performance of Asphalt Pavements Using Acoustic Emission: A Review

2018

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Low-temperature cracking is a major form of distress that can compromise the structural integrity of asphalt pavements located in cold regions. A review of an Acoustic Emission (AE)-based approach is presented that is capable of assessing the low-temperature cracking performance of asphalt binders and asphalt pavement materials through determining their embrittlement temperatures. A review of the background and fundamental aspects of the AE-based approach with a brief overview of its application to estimate low-temperature performance of unaged, short-term, and long-term aged binders, as well as asphalt materials, is presented. The application of asphalt pavements containing recycled asphalt pavement (RAP) and recycled asphalt shingles (RAS) materials to thermal cracking assessment is also presented and discussed. Using the Felicity effect, the approach is capable of evaluating the self-healing characteristics of asphalt pavements and the effect of cooling cycles upon their fracture behavior. Using an iterative AE source location technique, the approach is also used to evaluate the efficiency of rejuvenators, which can restore aged asphalt pavements to their original crack-resistant state. Results indicate that AE allows for relatively rapid and inexpensive characterization of pavement materials and can be used towards enhancing pavement sustainability and resiliency to thermal loading.

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