详情

原文传递 EVALUATION OF TOP-DOWN CRACKING IN THICK ASPHALT PAVEMENTS AND THE IMPLICATIONS FOR PAVEMENT DESIGN.

题名：	EVALUATION OF TOP-DOWN CRACKING IN THICK ASPHALT PAVEMENTS AND THE IMPLICATIONS FOR PAVEMENT DESIGN.
作者：	Myers-LA; Roque-R
关键词：	Asphalt-concrete-pavements; Crack-propagation; Finite-element-method; Fracture-mechanics; Longitudinal-cracking; Mathematical-prediction; Pavement-cracking; Pavement-design; Pavement-performance; Stiffness-; Tension-
摘要：	Surface-initiated longitudinal wheelpath cracks (or top-down cracks) had been observed in both cores and trench sections removed from asphalt concrete highway pavements. Cracking was documented in both thin and thick pavement sections and the mechanisms for surface crack propagation were explained. An approach was developed using a combination of fracture mechanics and finite element modeling to analyze a cracked pavement and predict the response of the pavement near the crack tip and throughout the depth of the asphalt concrete layer. Prediction of pavement response indicated that the mechanism for crack propagation was primarily tensile and that the influence of pavement structure and load spectra (magnitude and position) is significant. Load positioning and temperature-induced stiffness gradients in the asphalt concrete were shown to have the most effect on crack propagation, along with asphalt and base layer stiffness. The mechanism provided an explanation for crack propagation that confirmed observations of crack growth in the field. Crack growth was divided into stages according to crack length and depending on various structural characteristics. A concept called "time of low crack-growth activity" was formulated that considers the magnitude of tension and crack length as a function of time. Most importantly, the mechanism and details of top-down cracking were described and may be considered before selecting an appropriate perpetual pavement system.
总页数：	Transportation Research Circular. 2001/12. (503) pp79-87 (2 Phot., 6 Fig.)
报告类型：	科技报告