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Pavement Distress and Evaluation

Pavement Distress and Evaluation Mike Mamlouk Arizona State University Distresses in Asphalt Pavement Basic Distress Mechanisms Load-related Temperature-related Moisture-related Age-related Material-related Construction-related Combinations Distribution of Wheel Load Wheel Load Hot-mix asphalt Base Subbase Natural soil Fatigue Cracking Advanced Stage of Fatigue Cracking Permanent Deformation (Rutting). Wheel load HMA Surface Base Subbase Soil Rutting Rutting Confined to HMA Layer Unstable HMA. Poor Compaction During Construction Poor Subgrade thermal Cracking thermal Cracks Wide thermal Crack Block Cracking Frost penetration Frost Heave HMA surface Base Subbase Ice lenses Water Bleeding & Pumping Depression due to Pumping Stripping Separation of asphalt from aggregate Stripping Raveling Flushing / Bleeding Polished Aggregate Shoving Distresses in Concrete Pavement Basic Distress Mechanisms Load-related Fatigue Faulting Temperature-related Low-temp.

Thermal-Gradient Related Stresses Temperature differential between the top and bottom of the slab . ... Pavement Evaluation 1. Surface condition / distress 2. Serviceability / roughness 3. Structural capacity 4. Surface friction ... •In-situ material properties •Structural adequacy Potential Results From NDT . Dynaflect .

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Polymer-Modified Asphalt 101 - Pavements/Materials …

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Nov 12, 2014 · – For asphalt cements: The dispersion of the relatively aromatic, polar, associating molecules in a less aromatic, less polar solvent phase. – For Polymer Modified Asphalt Cements: The extent of dispersion between the asphalt cement and the modifier. This determines to a large extent the physical properties of the binder.

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