Best Practices for Road Weather Management Version 2.0
Title:
Evaluating Climate Change Impacts on Low Volume Roads in Southern Canada
Abstract:
Information extracted from global climate models suggests that average temperatures and annual precipitation will increase over the next several decades, with potential implications for pavement performance and design. Using Canadian data from the Long- Term Pavement Performance program, the Mechanistic-Empirical Pavement Design Guide was used to quantify the impacts of projected climatic changes on pavement performance of low-volume roads at six sites. A series of analyses were conducted to assess the impact of pavement structure, material characteristics, traffic loads, and changes in climate on incremental and terminal pavement deterioration and performance. Results suggest that rutting (asphalt, base and subbase layers) and both longitudinal and alligator cracking will be exacerbated by climate change with transverse cracking becoming less of a problem. In general, maintenance, rehabilitation and reconstruction will be required earlier in the design life; however, the effects of climate change were found to be modest relative to effects of regional baseline climate differences and increased future traffic. For road authorities, key adaptations will relate to when and how to modify current design and maintenance practices. Pavement engineers, with assistance from government and academic climate change experts, should be encouraged to develop a protocol or guide for considering potential climate change in the development and evaluation of future designs and maintenance programs. Incorporating other climate-related road infrastructure issues, for instance those associated with concrete pavements, surface-treated roads, airfields, bridges and culverts, would also be beneficial. At a minimum, long time series of historic climatic and road weather observations ?ideally greater than 30 years in the case of climate? should be incorporated into analyses of pavement deterioration and applicability of Seasonal Load Restrictions and Winter Weight Premiums or assignment of performance graded materials.
Source(s):
87th Transportation Research Board (TRB) Annual Meeting; University of Waterloo. For an electronic copy of this resource, please direct your request to WeatherFeedback@dot.gov.
Date: 2007
Author:
Tighe, Smith, Mills, Andrey
Keywords:
Pavement deterioration
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