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Asphalt Layer

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Eyal Levenberg – 1st expert on this subject based on the ideXlab platform

  • viscoelastic genetic algorithm for inverse analysis of Asphalt Layer properties from falling weight deflections
    Transportation Research Record, 2013
    Co-Authors: Sudhir Varma, Emin M Kutay, Eyal Levenberg

    Abstract:

    The falling weight deflectometer (FWD) is a nondestructive test whose results are typically used for backcalculating in situ Layer properties of pavements. Most backcalculation methods assume the pavement to be a Layered elastic half-space. However, Asphalt pavements behave more like multiLayered viscoelastic systems, especially in response to small or short-duration load applications. Hence, although elastic analysis is computationally efficient and well accepted in the engineering community, the theory cannot produce the viscoelastic properties of the Asphalt concrete (AC) Layer. In this study, a new inverse analysis method is proposed to backcalculate both linear elastic and viscoelastic properties of pavement Layers as well as the AC time-temperature shift factor. In this method, the FWD load-response history of a single FWD drop and variation in temperature along the depth of the AC Layer during the drop are used for performing the computations. The underlying (viscoelastic) forward solver is approxi…

M. R. Islam – 2nd expert on this subject based on the ideXlab platform

  • Effect of Cross-Anisotropy of Hot-Mix Asphalt Modulus on Falling Weight Deflections and Embedded Sensor Stress-Strain
    Transportation Research Record, 2013
    Co-Authors: M. U. Ahmed, Rafiqul A. Tarefder, M. R. Islam

    Abstract:

    In this study, the effects of cross-anisotropy on Asphalt pavement responses are examined. A dynamic finite element model (FEM) was developed in ABAQUS to simulate pavement responses under falling weight deflectometer (FWD) and truck loads on a pavement section on I-40 at Mile Post 141 in New Mexico. This section was recently instrumented with strain gauges, moisture probes, and pressure cells. Pavement response (i.e., stress, strain, deflection) from the instrumented section is compared with the FEM-predicted values. Two combinations of cross-anisotropy are considered. The first combination considers cross-anisotropy of modulus in every Layer of the pavement, and the second combination considers it only in the hot-mix Asphalt Layer. Time-deflection histories, stress, and strain are predicted from the FEM under FWD and truck loads. Results show that predicted deflections, stress, and strain are highly sensitive to cross-anisotropy. Predicted deflections, stress, and strain increase with a decrease in n-va…

Sheng Li – 3rd expert on this subject based on the ideXlab platform

  • interlaminar shear fatigue and damage characteristics of Asphalt Layer for Asphalt overlay on rigid pavement
    Construction and Building Materials, 2014
    Co-Authors: Sheng Li

    Abstract:

    Abstract According to the failure characteristics of Asphalt overlay on rigid pavement, a special-purpose test apparatus and method were developed for interlaminar shear fatigue tests to evaluate interlaminar shear fatigue of Asphalt overlay on rigid pavement, and an interlaminar shear fatigue equation was determined by analyzing the correlation between fatigue life and shear stress obtained from interlaminar shear fatigue tests. The damage mechanics theory, heat transfer theory and the Finite Element Method (FEM) were adopted to analyze fatigue damage characteristics and cracking mechanism of Asphalt Layer. The result showed that under repeated traffic loading, the Asphalt Layer located at the existing transverse joints of the rigid base on the side of traffic loading, is prone to fatigue cracking, and the crack extends upward along the tip due to the tensile stress; thermal fatigue damage occurs mainly on the surface of Asphalt overlay, the horizontal tensile stress on the surface of Asphalt overlay decreases linearly with the increase of temperature variation times, and the fatigue life of Asphalt overlay decreases with the increase of the amplitude of temperature variation; and it is recommended to choose Asphalt mixtures with features such as relatively low thermo-contraction character, low modulus and high tensile strength to guarantee the expected cracking resistance and durability of Asphalt overlay on rigid pavement.