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Localized Interface Debonding as a Potential Mechanism of Near-Surface Longitudinal Cracking in Asphalt Pavements
Başlık:
Localized Interface Debonding as a Potential Mechanism of Near-Surface Longitudinal Cracking in Asphalt Pavements
Yazar:
Hernando, David, author.
ISBN:
9780438120556
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (122 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-11(E), Section: B.
Özet:
This dissertation describes a comprehensive modeling effort aimed at examining the potential link between localized interface debonding and near-surface longitudinal cracking in the wheelpath of asphalt pavements. Pavement stress analyses showed the existence of a zone of critical stress states defined by high shear stress coupled with low confinement for a broad range of depths (between 1 and 3 in below the surface) and extending to 2 in from the edge of the tire, regardless of asphalt layer thickness. Repeated traffic loads can promote a debonded strip below the wheelpath along an interface located through this zone of critical stress states. The introduction of a debonded strip along the interface caused a stress redistribution that intensified shear stress ahead of the tip of the debonded zone and tensile stress immediately behind the tip (tension at this location exceeded that under the tire). A finite element parametric study based on maximum tension and maximum Von Mises stress (associated with the strain energy of distortion) concluded that a debonding strip along the interface can lead to development of near-surface longitudinal cracking according to three potential mechanisms: (1) bending caused by repeated traffic loads can initiate a crack below the edge of the debonded strip that reflects to the surface due to traffic wander and thermal cycles, especially given near-surface differential aging in the asphalt mixture; (2) traffic wander can initiate a vertical crack above the edge of the debonded strip and promote upward propagation; and (3) internal tension due to partially restrained mixture dilation in areas of large distortion can result in a crack above the edge of the debonded strip that propagates upward through the more aged and less fracture-tolerant mixture near the surface. Future work should focus on achieving a better understanding of the mechanism of interface bond breakdown in order to prevent debonding in the first place. Identification of bonding agents and interface surface characteristics more resistant to interface bond breakdown can help prevent and, in turn, mitigate the occurrence of near-surface longitudinal cracking in asphalt pavements.
Notlar:
School code: 0070
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(696597.1) | 696597-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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