Micromechanics Study on Top-Down Cracking

Wang, L B; Myers, L A; Mohammad, Louay N.; Fu, Yanrong

doi:10.3141/1853-14

Cited by 55 publications

(26 citation statements)

References 18 publications

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“…For example, top-down cracking is a type of failure that initiates at or near the pavement surface and is typically generated by surface compression loading. As pointed out by Wang et al (2003), this problem is still not completely understood. Some of the conflicting issues are related to the stress distribution under concentrated and distributed surface loadings as shown in Fig.…”

Section: Surface Compression Loading Of a Semi-infinite Massmentioning

confidence: 99%

“…It would thus appear that a micro-mechanical model is needed to resolve this paradox, and Ferrari et al (1997) and Wang et al (2003) have applied doublet mechanics to investigate this issue. For the Flamant problem using the transformation given by (7) and (8), Ferrari et al (1997) have developed the micro-stresses for the first order, non-scale case for a medium with hexagonal packing as shown in Fig.…”

Section: Surface Compression Loading Of a Semi-infinite Massmentioning

confidence: 99%

“…This approach originally developed by Granik (1978), has been applied to granular materials by Granik and Ferrari (1993) and Ferrari et al (1997). Recently Wang et al (2003) presented a micro-mechanical study of top-down cracking of asphalt materials using some results from this theory. Doublet mechanics is a micro-mechanical discrete model whereby solids are represented as arrays of points, particles or nodes at finite distances.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A comparison of micro-mechanical modeling of asphalt materials using finite elements and doublet mechanics

Sadd

Dai

2005

Mechanics of Materials

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Section: Surface Compression Loading Of a Semi-infinite Massmentioning

confidence: 99%

Section: Surface Compression Loading Of a Semi-infinite Massmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A comparison of micro-mechanical modeling of asphalt materials using finite elements and doublet mechanics

Sadd

Dai

2005

Mechanics of Materials

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“…Load induced top-down fatigue cracking (i.e., cracking that initiates at the surface of asphalt concrete (AC) layer and propagates downward) has been observed in many parts of the world (e.g., [1][2][3][4]. It is widely accepted that top-down cracking results from a critical combination of load, thermal and aging effects.…”

Section: Introductionmentioning

confidence: 99%

Reliability-Based Design Procedure for Fatigue Cracking in Asphalt Pavements

Dinegdae

Birgisson

2016

Transportation Research Record

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The need to account for design inputs variabilities effect on predicted performance has led many design procedures to address the issue of reliability for pavement applications. The Florida cracking model utilizes an empirically derived reliability for fatigue cracking design of asphalt pavements. A reliability approach, which is based on probabilistic uncertainty quantification, is necessary in order to account properly and effectively for the contribution of the variability in each parameter to the overall variance. This paper presents a load and resistance factor design (LRFD) procedure for the Florida cracking model. By delivering designs of uniform reliability, LRFD provides the basis for developing quality control and quality assurance standards. A first order reliability method (FORM) which incorporates central composite design (CCD) based surrogate model is employed to compute the reliability and formulate the partial safety factors. The reliability calibration was achieved based on field pavement sections that have a wide range in design inputs and target reliability. Illustrative designs based on the developed LRFD procedure has shown the effectiveness of the partial safety factors, and thus giving further confirmation to the credibility of the employed reliability analysis methodology. INTRODUCTIONLoad induced top-down fatigue cracking (i.e., cracking that initiates at the surface of asphalt concrete (AC) layer and propagates downward) has been observed in many parts of the world (e.g., 1-4). It is widely accepted that top-down cracking results from a critical combination of load, thermal and aging effects. A multi-year research at the University of Florida has led to the development of a new hot mix asphalt fracture mechanics (HMA-FM) framework. HMA-FM is based on visco-elastic principle and predicts the initiation and propagation of top-down cracking (e.g., 5, 6). Based on the performance evaluation of field pavement sections, a parameter termed energy ratio (ER) which relates well with the observed performance in the field was identified and introduced into HMA-FM (7). Utilizing ER as a design criterion, a mechanistic empirical (M-E) pavement design model for top-down fatigue cracking was developed. The model was calibrated and validated on a number of field pavement sections from the State of Florida and has been found to be successful in distinguishing pavement sections which exhibited cracking from those that did not. The energy ratio method has recognized the importance of accounting for the effects of uncertainty in design inputs on predicted performance, and has therefore incorporated an empirically derived reliability concept. These reliability factors were developed by fitting computed ER values of a single section with respective target reliabilities without accounting directly for the effects of design inputs variabilities on performance (8). A reliability which is not based on probabilistic method of uncertainty propagation might not give designs of uniform target reliability th...

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“…In recent decades, some researchers have applied the concept of micromechanics to asphalt mixtures by using digital image processing (Chang and Meegoda 1999;Guddati et al 2002;Wang et al 2003). Micromechanics-based models of asphalt mixtures have been employed to predict the physical properties of these mixtures (Li et al 1999;Li and Metcalf 2005).…”

Section: Introductionmentioning

confidence: 99%

A Comparison of Two-Dimensional and Three-Dimensional Micromechanical Discrete Element Modeling of the Splitting Tests for Asphalt Mixtures

Peng¹,

Bao²,

Wang³

2017

dtetr

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ABSTRACT:Simulation is an important approach for predicting the physical properties of asphalt mixtures. However, the simulation results are usually perfect because the model parameters or material properties were generally obtained by reverse modeling, and it is difficult to find the problems in simulation and distinguish superiority and inferiority of models by the results. Based on imaging and discrete element method (DEM), this study aims to compare two-dimensional (2D) and three-dimensional (3D) micromechanical modeling of the splitting tests for asphalt mixtures. The 2D and 3D microstructure-based discrete element models of a splitting test were established by a discrete element program called Particle Flow Code in Two/Three Dimensions (PFC2D/3D). The strengths and stresses at low temperatures were numerically simulated based on these models. The obtained results were compared, and then verified by an actual splitting test. Results reveal that the 3D discrete element simulations are more stable and more reliable than the 2D discrete element simulations.

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Micromechanics Study on Top-Down Cracking

Cited by 55 publications

References 18 publications

A comparison of micro-mechanical modeling of asphalt materials using finite elements and doublet mechanics

A comparison of micro-mechanical modeling of asphalt materials using finite elements and doublet mechanics

Reliability-Based Design Procedure for Fatigue Cracking in Asphalt Pavements

A Comparison of Two-Dimensional and Three-Dimensional Micromechanical Discrete Element Modeling of the Splitting Tests for Asphalt Mixtures

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