Mechanistic characterization techniques of road materials represent one of the major improvements Is based primarily on multilayered linear elastic analysis. Mechanistic-Empirical Pavement Design Guide (M-EPDG) (NCHRP 2004) model, Currently, pavement analysis, including the new Of environmental, operating, and service conditions, as well as traffic loading, mustīe identified and understood. Ranges of temperatures and moisture content. Road designers expect roads to perform without any major distresses over wide Unbound material strength loss due to thaw during the spring season (Dore 2002). Pavement deterioration in cold regions is caused by three factors: thermal contraction and fracture in the bound layer, volume changes caused by frost heave, and Regions Engineering, © ASCE, ISSN 0887-381X. This paper is part of the Journal of Cold Discussion period open until Augseparateĭiscussions must be submitted for individual papers. E-mail: This manuscript was submitted on Maapproved on Ap of Civil and Environmental Engineering, Carleton Univ., Ottawa, ON,Ĭanada K1S 5B6. Ottawa, ON, Canada K1A 0R6 (corresponding author). In gene ral, pavement in frost-affectedĬonstruction Portfolio, National Research Council Canada, 1200 Montreal Rd., M-20 Season, and long distances to remote areas. In warm regions in that it is constrained by daylight, weather, a short construction Road construction in cold regions differs from that Tracks produced by repeated passage of vehicles) and cracking due to thermal Load-bearing capacity change with season. In seasonally and perennially frozen areas, such as the northern United StatesĪnd most Canadian provinces, pavement is affected by frost, and its strength and Seasonal changes in moisture content and temperature andįreeze-thaw cycles can significantly affect the life and performance of pavement. The effects of temperature and moisture changes over an extended period on a dailyĪnd a seasonal basis. When studying the performance of flexible pavement, it is necessary to understand The sensitivity analyses of environmentalĬonsideration using the new design guide software are presented in this paper.ĭOI: 10.1061/(ASCE)CR.1943-5495.0000113. These parameters are accounted for in the new design guide through the resilient Moisture and temperature were indirectly considered in the current guide, whereas Showed the shift in emphasis from total reliance on an empirical method to a combination of mechanistic and empirical methods in the new design guide.
It considers the historical development of AASHTO design guides with new design guides. Road structure considered in the design guides of AASHTO. Namely moisture and temperature, on the material properties of flexible pavement 2Ībstract: This paper presents an overview of the effects of environmental factors, For personal use only all rights reserved. Downloaded from by University of California, San Diego on 06/28/17.
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