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Pavement Rehabilitation and Design Strategy for Heavy Loads in the Energy Development Areas
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2025-02-01
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[PDF-6.91 MB]
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Edition:September 2018–August 2022
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Abstract:In recent years, rapid energy development in Texas has caused significant damage to many farm-to-market (FM) roads, which traditionally have a thin asphalt surface layer plus a stabilized base directly over the subgrade. These FM roads performed well under normal traffic loads but failed dramatically under the energy-sector truck loads. There is an urgent need to repair many of these badly damaged roadways with a new pavement rehabilitation and design strategy in all energy development areas. In this project, the researchers analyzed all the traffic data collected by both permanent and portable weigh-in-motion stations around Texas and found that the energy development areas saw much heavier trucks than the non-energy development areas. The researchers concluded that overloading caused significant damage to pavements compared to regular equivalent single-axle loads. The researchers then presented a six-step pavement rehabilitation and design strategy and applied it to assist with pavement designs in four districts using the Texas Flexible Pavement Design System (FPS 21) combined with the latest Texas Mechanistic-Empirical Pavement Design for Flexible Pavements (TxME). Furthermore, the researchers continued surveying the field performance of five existing test sections with full-depth reclamation (FDR). Overall, most FDR test sections performed well. However, some of the FDR test sections had early failures. Therefore, adequate pavement designs with accurate traffic loading as inputs are critical; the combined FPS 21 and TxME check is a useful tool for pavement engineers to design satisfactory roads capable of carrying such heavy loads in energy development areas.
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