Advanced Testing and Characterization of Asphalt Concrete Materials in Tension

Uzan, Jacob; Levenberg, Eyal

doi:10.1061/(asce)1532-3641(2007)7:2(158)

Cited by 39 publications

(13 citation statements)

References 11 publications

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“…In general terms, the calibrated model prediction are in tune with those reported in Uzan and Levenberg (2007), and with those recently stated in Underwood and Kim (2012). They may also explain part of the strain sensitivity and variability encountered in complex modulus tests as reported (among several others) by Dougan et al (2003).…”

Section: Disclosure Statementsupporting

confidence: 79%

Modelling asphalt concrete viscoelasticity with damage and healing

Levenberg

2015

International Journal of Pavement Engineering

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The behaviour under load of asphalt concrete (AC) was viewed as additively separable into viscoelastic and viscoplastic components, and the study focused on modelling the pre-peak response of the viscoelastic part under constant temperature conditions. Non-linear viscoelastic behaviour was first exposed in several test modes, and a constitutive theory was subsequently offered -potentially capable of capturing and reproducing the observations. The modelling was based on replacing applied stresses in the linear convolution formulation with effective stresses; it included a mechanism for simulating the following effects: (i) short-lasting damage, (ii) long-lasting damage, (iii) stiffening under compressive conditions and (iv) healing during recovery intervals. As an initial validation effort, the model's reproducibility was assessed by calibration to a uniaxial compression experiment consisting of both small and medium strain levels. Next, the calibrated model was employed to forecast small-strain behaviour in a standard complex modulus test. The simulated results qualitatively agree with recently reported findings that challenge the existence of a linear viscoelastic domain for AC.

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Section: Disclosure Statementsupporting

confidence: 79%

Modelling asphalt concrete viscoelasticity with damage and healing

Levenberg

2015

International Journal of Pavement Engineering

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“…The final product of the VECD model is the so-called damage characteristic curve, which is the relationship between pseudo stiffness and the damage parameter. Pseudostiffness describes a material's integrity, and the damage parameter represents the amount or degree of damage in a material (6,7). The power of the VECD model is that the damage characteristic curve remains the same regardless of the applied stress or strain amplitudes, loading type (cyclic versus monotonic), and temperature, as long as the reduced loading frequency or reduced rate of loading is high enough not to cause significant viscoplastic strain.…”

Section: Viscoelastic Continuum Damage Propertymentioning

confidence: 99%

Use of Cyclic Direct Tension Tests and Digital Imaging Analysis to Evaluate Moisture Susceptibility of Warm-Mix Asphalt Concrete

Lee

Kwon

et al. 2013

Transportation Research Record

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This paper presents a simplified viscoelastic continuum damage material model for the evaluation of moisture susceptibility of asphalt concrete. The model is based on cyclic direct tension testing and layered visco elastic analysis. The visual stripping inspection afforded by digital imaging analysis is also proposed as an intuitive and straightforward method for moisture susceptibility evaluation. These methods were applied to a Superpave ® 19mm hotmix asphalt mixture and corresponding warm mix asphalt mixtures modified by a polyethylene waxtype additive with and without an antistripping agent. The fatigue life predicted by the sim plified viscoelastic continuum damage and layered viscoelastic analysis models had a strong correlation with the percentage of stripping deter mined from specimen surfaces that were fractured during cyclic direct tension testing of the hotmix and warmmix asphalt mixtures with various asphalt contents. In addition, a polyethylene waxtype additive combined with an antistripping agent was found to provide a longer fatigue life and less stripping than a pure polyethylene waxtype additive. The findings from this paper should provide guidance to agencies and material engineers in developing asphalt binder modifiers that lengthen the fatigue life of pavements and reduce moisture susceptibility.

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“…It is well recognized that pavement materials do not comply with isotropic LET assumptions. The resilient response of HMA mixtures is known to be anisotropic and nonlinear viscoelastic (Shields et al, 1998;Levenberg, 2006;Uzan and Levenberg, 2007). The resilient response of unbound layers is nonlinear elastic and stress-state sensitive (Uzan, 1985;1992) and also anisotropic (e.g., Tutumluer and Thompson, 1997).…”

Section: Calibration To Apt Conditionsmentioning

confidence: 99%