United States Department of Transportation
i
Evaluation of the Long-Term Performance and Benefit of Using an Enhanced Micro-Milling Resurfacing Method [GDOT 13-20]
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2019-01-01
[PDF-2.93 MB]
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Edition:Final; July 2013 – January 2019
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Abstract:The Georgia Department of Transportation (GDOT) has applied the environmentally friendly and cost-effective pavement preservation method, micro-milling and thin overlay, to Georgia’s interstate highways since 2007. The objectives of this project were to critically assess the long-term performance of micro-milling and thin overlay and to quantitatively evaluate its economic and environmental benefits by conducting life-cycle cost analysis (LCAA) and life-cycle analysis (LCA). GDOT’s projects on I-75, I-95, and I-285 were analyzed in the study. As an alternative, the conventional milling and overlay (“conventional method”) was used for comparison. Results showed that the micro-milling and thin overlay method has 10-12 years of expected service life. It is comparable to the conventional method but reduces the costs by $65,600 per lane mile compared with the conventional method. The study also showed that micro-milling and thin overlay is a good crack relief treatment. In addition, it produces fewer greenhouse gases, and uses less water and energy than the conventional method. Overall, micro-milling and thin overlay is a promising, sustainable pavement preservation method that will save money for transportation agencies if it is applied adequately on the pavements with sound structural conditions.
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