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FY 2020 TRC Projects




Determining Costs Attributable to Overweight Axle Loads   Investigating Calcium Sulfoaluminate (CSA) Cement and Sacrificial Anodes
Arkansas currently has no ability to assess fines for axle load limit violations. About 8,100 load shift tickets were issued in 2017 for overweight axle load limit violations. TRC2001 will determine if there is a significant amount of damage on Arkansas roadways due to overweight axle loads. The research would determine pavement and bridge repair life-cycle costs attributed to overweight axle loads. A literature review and a survey to other State DOTs will identify various methodological approaches. Falling Weight Deflectometer (FWH) training will support pavement conditions assessment. The research team will then develop a methodology to quantify damages caused by overweight axle loads. The survey results, load shift citations, and data from FWD tests will be collected and analyzed. Calcium Sulfoaluminate (CSA) Cement is a rapid setting hydraulic cement similar to Portland cement with a very fast strength gain. If a typical Portland cement concrete mixture can reach 4,500 psi in 28 days, the complementary CSA cement mixture would reach 4,500 psi in 4 hours. Because of this extremely fast strength gain, CSA cement is an ideal material for repairs. ARDOT currently utilizes CSA cement for bridge deck repair, but corrosion issues tend to arise in the patched area due to several factors. One objective of this project is to evaluate the effectiveness of using sacrificial anodes when patching bridge decks with CSA cement mixtures in regards to corrosion inhibition and repair longevity. This will be accomplished by patching sections of a bridge deck with the anodes included and monitoring the corrosion and wear of the patch compared to other patches that were placed without anodes. The other objectives include evaluating the feasibility of ARDOT using CSA cement for full depth repairs of roadways and determining an appropriate mix design for ARDOT to use CSA cement for full-depth repairs of roadways.





Data Driven Methods to Assess Transportation System Resilience in Arkansas


The goal of this study is to develop and implement a framework for measuring the resilience of Arkansas's highway transportation system. Tasks will include: synthesizing existing studies and practices to define resiliency assessment methods and resiliency indices as well as evaluating current state of practices within ARDOT; applying the most relevant methodology to perform a resiliency assessment of the Arkansas highway network; providing recommendations for improving system resiliency; and implementation. Key deliverables include development of a criticality map for the ARDOT highway system, development of case studies to demonstrate the application of risk and resilience analyses for ARDOT critical assets, and review of ARDOT policies and practices to determine appropriate locations for inclusion of risk and resilience analysis findings and procedures.