Selection of Structural Overlays Using Asphalt Mixture Performance

Nobakht, Mona; Sakhaeifar, Maryam S.; Newcomb, D E

doi:10.1061/(asce)mt.1943-5533.0002070

Cited by 10 publications

(2 citation statements)

References 19 publications

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“…Rutting and fatigue damage are two major forms of distress that cause the most concern in asphalt concrete pavements, as they affect both serviceability and safety over the performance life of asphalt pavements. Rutting-permanent deformation under the wheels' path-is more dominant at high temperatures, and fatigue damage-evolution of micro-cracks and microvoids-generally is more problematic at low and intermediate temperatures (1)(2)(3)(4)(5)(6)(7)(8)(9). Several prominent studies have been conducted regarding constitutive modeling of rutting and fatigue damage mechanisms resulting in proposed (visco-)plastic and (visco-)damage constitutive relationships (10)(11)(12)(13)(14)(15)(16)(17)(18)(19).…”

mentioning

confidence: 99%

A Straightforward Procedure to Characterize Nonlinear Viscoelastic Response of Asphalt Concrete at High Temperatures

Bazzaz

Darabi

Little

et al. 2018

Transportation Research Record

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This paper proposes a straightforward procedure to characterize the nonlinear viscoelastic response of asphalt concrete materials. Furthermore, a model is proposed to estimate the nonlinear viscoelastic parameters as a function of the triaxiality ratio, which accounts for both confinement and deviatoric stress levels. The simplified procedure allows for easy characterization of linear viscoelastic (LVE) and nonlinear viscoelastic (NVE) responses. First, Schapery’s nonlinear viscoelastic model is used to represent the viscoelastic behavior. Dynamic modulus tests are performed to calibrate LVE properties. Repeated creep-recovery tests at variable deviatoric stress levels (RCRT-VS) were designed and conducted to calibrate the nonlinear viscoelastic properties of four types of mixtures used in the Federal Aviation Administration’s National Airport Pavement and Materials Research Center test sections. The RCRT-VS were conducted at 55°C, 140 kPa initial confinement pressure, and wide range of deviatoric stress levels; mimicking the stress levels induced in a pavement structure under traffic. Once calibrated, the model was validated by comparing the model predictions and experimental measurements at different deviatoric stress levels. The predictions indicate that the proposed method is capable of characterizing NVE response of asphalt concrete materials.

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confidence: 99%

A Straightforward Procedure to Characterize Nonlinear Viscoelastic Response of Asphalt Concrete at High Temperatures

Bazzaz

Darabi

Little

et al. 2018

Transportation Research Record

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“…Water filtration and the addition of air, an oxidation process, is generated in the mixture as the number of voids increases [ 31 , 32 ], accelerating the aging processes of the pavement and increasing its fragility, decreasing its fracture resistance [ 33 , 34 ], and increasing the probability of cracking failure due to thermal changes [ 35 , 36 ]. Therefore, environmental agents can change the mechanical characteristics of the pavement [ 37 ]; as the temperature decreases, the mixture becomes stiffer, reducing its elasticity [ 38 , 39 ] and making it prone to cracking more than less stiff ones [ 40 , 41 , 42 , 43 ]. This is because temperature impacts the viscoelastic and stress state behavior, resulting in fracture initiation or propagation [ 44 ].…”

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confidence: 99%

Evaluation of Mode-I Fracture Toughness of Asphalt Mixtures with Symmetric Geometry Specimen at Intermediate Temperature

et al. 2022

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Mode I fracture (tensile type) is the common cracking mode of asphalt pavements, which is caused by thermal cyclic loading or traffic. Some studies allow the analysis of the fracture modes by means of standardized tests, some of which are limited, difficult, with little repeatability or do not generate an adequate tension state. In this paper, mode I fracture toughness of asphalt mixtures with symmetric geometry specimens at intermediate temperature is evaluated. Experimental results from direct tension test and simulations on asphalt mix specimens subjected to intermediate temperatures of 10, 20 and 30 °C, mode I load rates (0.5, 1 and 2 mm/min) and notches (2 and 3 cm) were compared to find the variables that reflect the operating conditions of the asphalt mix. Results showed that shear stresses are 8.12% lower in the simulations with respect to the tests, while the load–deformation curves show 30% and 35% variation, where the temperature of 20 °C, the notch of 2 cm and the loading speed of 1 mm/min are the conditions that best represent the stress state of the test; moreover, it manages to consider the elastic and viscous components of the material.

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Dynamic modulus and phase angle prediction of laboratory aged asphalt mixtures

Nobakht

Sakhaeifar

2018

Construction and Building Materials

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Selection of Structural Overlays Using Asphalt Mixture Performance

Cited by 10 publications

References 19 publications

A Straightforward Procedure to Characterize Nonlinear Viscoelastic Response of Asphalt Concrete at High Temperatures

A Straightforward Procedure to Characterize Nonlinear Viscoelastic Response of Asphalt Concrete at High Temperatures

Evaluation of Mode-I Fracture Toughness of Asphalt Mixtures with Symmetric Geometry Specimen at Intermediate Temperature

Dynamic modulus and phase angle prediction of laboratory aged asphalt mixtures

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