A Mechanistic–Empirical Model for Top–Down Cracking of Asphalt Pavements Layers (2018) / Chapter Skim
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A-1 APPENDIX A MEASUREMENT OF COMPLEX MODULUS GRADIENT USING DIRECT TENSION TEST The test protocol to measure the complex modulus and modulus gradient include: 1)
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A-2 Figure A-1. Field Core Specimen Preparation Table A-1.
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A-3 Direct Tension Test The direct tension test is conducted using the Material Test System (MTS) shown in Fig.
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A-4 shorter. This observation indicates that the use of time-temperature superposition and thermorheologically simple material can be applied to the field specimens.
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A-5 which presents the shape of the stiffness gradient; and k is the ratio of the modulus at the top to the modulus at the bottom. When z equals to 2 d , the center modulus Ec is obtained.
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A-6 (a) Strain at Different Depths of Field Core Specimen (b)
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A-7 Figure A-7. Illustration of Non-uniform Distributions of Stress, Strain, and Modulus in Field Core Specimen
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