A Mechanistic–Empirical Model for Top–Down Cracking of Asphalt Pavements Layers (2018) / Chapter Skim
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From page 10... ...
10 CHAPTER 3. RESEARCH PLAN The research plan requires the development and synthesis of eight components to cover the eleven submodels for top-down cracking as mentioned in the previous chapter.
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11 Laboratory Testing of Asphalt Field Cores The research team tests the asphalt field cores with modulus gradient at different aging times using the direct tension test. The purpose is to determine the complex modulus and modulus gradient, and construct the dynamic modulus master curve for field-aged asphalt mixtures.
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12 has demonstrated that top-down cracking is affected by various factors, including the complex state of high tensile or shear stresses induced by the traffic loading, material properties such as the modulus gradient in the asphalt layer, moduli of the base and subgrade layers, and pavement structures. Therefore, the finite element modeling to simulate the propagation of top-down cracking should consider different combinations of these essential factors and calculate the Jintegral for each case.
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13 pavement materials and the thermal J-integral is determined using the ANN model. Aging of asphalt mixture is taken into consideration for prediction of the thermal J-integral.
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14 progress beyond the low severity stage, they become connected with small transverse cracks and identified with alligator cracking. The developed top-down cracking model predicts the development of a crack downward from the pavement surface.
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From page 15... ...
15 suffers top-down cracking. The literature review conducted identifies the pavement structure that most likely suffers top-down cracking.
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