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The US Transportation Collection consists of documents from across all transportation modes with specific focus on research reports from US DOT, state DOTs, and other transportation organizations. Bookmark this collection: https://rosap.ntl.bts.gov/collection_ust or https://doi.org/10.21949/1530857.

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Showing 2781 - 2800 of 35959 results
  • Developing FDR Sections with InHouse Resources
    Developing FDR Sections with In-House Resources
    Texas A&M Transportation Institute
    2022-04-01 | PDF
    The objectives of the presentation are: 1. Describe the steps necessary for properly developing an FDR candidate project 2. Identify which department's resources are required 3. Explain procedures required to successfully start FDR construction. The presentation sought to show the benefits of Full Depth Reclamation (FDR), what makes a good FDR cand ...
  • Expanding FDR Technologies in Maintenance Operations Technical Report
    Expanding FDR Technologies in Maintenance Operations: Technical Report
    Sebesta, Stephen ;
    Scullion, Tom
    2022-04-01 | PDF
    Full-depth reclamation (FDR) is the main approach used across Texas to rehabilitate thin roadways that are structurally damaged. With the Eagle Ford Shale boom, the Texas Department of Transportation (TxDOT) faced the need to rehabilitate many miles of pavement in energy-sector areas of the state while placing heavy traffic back on the roadway the ...
  • Critical Assessment of HFSTs LongTerm Performance in Georgia Under Different Roadway Conditions
    Critical Assessment of HFST’s Long-Term Performance in Georgia Under Different Roadway Conditions
    Tsai, Yichang (James) ;
    Wang, Zhonghua
    2022-04-01 | PDF
    The Georgia Department of Transportation (GDOT) uses high friction surface treatment (HFST) as a countermeasure to address curve-related crashes proactively and reactively. In the US, as of December 2020, Georgia has the highest number of pavement miles and curve sites that use epoxy-based friction improvement surface treatments (FIST). These sites ...
  • Design and Detailing of Anchorages for Externally Bonded CFRP
    Design and Detailing of Anchorages for Externally Bonded CFRP
    Suksawang, Nakin ;
    Ryan, Paul
    2022-04-01 | PDF
    Recently, an increased number of CFRP repairs have been applied to strengthen concrete bridges' shear capacity. This poses many challenges as the bridge girder cannot be fully wrapped to ensure that the failure mode is governed by shear fracture combined with or followed by the CFRP fracture. Therefore, instead of fully wrapping the beam with CFRP, ...
  • Evaluation of Curing Effects on Cold InPlace Recycled CIR Materials
    Evaluation of Curing Effects on Cold In-Place Recycled (CIR) Materials
    Dave, Eshan V. ;
    Sias, Jo E.
    2022-04-01 | PDF
    Most cold In-place recycled (CIR) construction uses asphalt emulsion or foamed asphalt with or without active fillers as a stabilizing agent. To ensure the CIR layer gains appreciable stiffness and strength to support traffic, the stabilizing agents have to undergo curing (to dry additional moisture). If traffic is allowed on the CIR layer before s ...
  • Evaluating Ramp Meter Wait Time in Utah
    Evaluating Ramp Meter Wait Time in Utah
    Schultz, Grant G. ;
    Macfarlane, Gregory S
    2022-04-01 | PDF
    The purpose of this project is to develop an algorithm that can predict ramp meter wait time at metered freeway on-ramps throughout the state of Utah using existing loop detector systems on the ramps. The loop detectors provide data in 60-second increments that include volume, occupancy, and the metering rate. Using these data sources, several ramp ...
  • Evaluation of Asphalt Rubber and Reclaimed Tire Rubber in Chip Seal Applications
    Evaluation of Asphalt Rubber and Reclaimed Tire Rubber in Chip Seal Applications
    Elseifi, Mostafa A. ;
    Rahman, Nafiur
    2022-04-01 | PDF
    Chip sealing is a commonly used pavement maintenance technique that aims to delay pavement deterioration by reducing water infiltration and restoring skid resistance. The aim of this study was to characterize the chemical, molecular, and rheological properties of different asphalt emulsions, evaluate their laboratory performance, short-term field p ...
  • A Strategic Assessment of Needs and Opportunities for the Wider Adoption of Electric Vehicles in Indiana
    A Strategic Assessment of Needs and Opportunities for the Wider Adoption of Electric Vehicles in Indiana
    Konstantinou, Theodora ;
    Chen, Donghui
    2022-04-01 | PDF
    The primary objective of this study was to assess the challenges and opportunities associated with the provision of appropriate infrastructure to support electric vehicle (EV) operations and electrification across Indiana. A secondary objective of this study was to develop a strategic plan for INDOT that outlines new business opportunities for deve ...
  • Using Automated Vehicle AV Technology to Smooth Traffic Flow and Reduce Greenhouse Gas Emissions
    Using Automated Vehicle (AV) Technology to Smooth Traffic Flow and Reduce Greenhouse Gas Emissions
    Almatrudi, Sulaiman ;
    Parvate, Kanaad
    2022-04-01 | PDF
    Passenger and heavy-duty vehicles make up 36% of California’s greenhouse gas (GHG) emissions. Reducing emissions from vehicular travel is therefore paramount for any path towards carbon neutrality. Efforts to reduce GHGs by encouraging mode shift or increasing vehicle efficiency are, and will continue to be, a critical part of decarbonizing the tra ...
  • Feasibility and Performance of LowVolume Roadway Mixture Design
    Feasibility and Performance of Low-Volume Roadway Mixture Design
    Mayeux, Corey R ;
    Salari, Saman
    2022-04-01 | PDF
    The typical low-volume project in Louisiana is mill and replace (~2 in.) with no base repair. The less than ideal base conditions often lead to density variations in the asphalt wearing course. The 2016 Louisiana Department of Transportation and Development specification based pay for asphalt tonnage on density under a percent within limits (PWL) p ...
  • Assessing the Travel Demand and Mobility Impacts of Transformative Transportation Technologies in Indiana
    Assessing the Travel Demand and Mobility Impacts of Transformative Transportation Technologies in Indiana
    Luo, Hao ;
    Chahine, Ricardo
    2022-04-01 | PDF
    The rapid development of transformative transportation technologies, such as bike-sharing, shared e-scooters, and ridehailing systems, is reshaping the transportation landscape. These transformative transportation technologies have the potential to significantly change travel behavior and travel demand and affect transportation agencies’ planning, ...
  • Design and MASH TL3 Evaluation of Surface Mounted Median Guardrail
    Design and MASH TL-3 Evaluation of Surface Mounted Median Guardrail
    Sheikh, Nauman M. ;
    Bligh, Roger P.
    2022-04-01 | PDF
    This report presents the development and crash testing of a surface-mounted median guardrail on concrete. The research team developed several preliminary design concepts of the median guardrail. One of these was selected by the Texas Department of Transportation for further development through finite element simulation analysis and full-scale crash ...
  • Feasibility and Performance of LowVolume Roadway Mixture Design Tech Summary
    Feasibility and Performance of Low-Volume Roadway Mixture Design [Tech Summary]
    Mayeux, Corey R ;
    Salari, Saman
    2022-04-01 | PDF
    During specification meetings between the Louisiana Department of Transportation and Development (DOTD) and asphalt contractors around the state, a concern was raised regarding the payment methods for low-volume roadways. At the time, DOTD was using the “percent within limits” (PWL) model to determine payment for all roadways.
  • Determining the True Cost and Benefit for Collecting and Maintaining NonRoad and NonBridge Asset Data
    Determining the True Cost and Benefit for Collecting and Maintaining Non-Road and Non-Bridge Asset Data
    Stopher, Peter R. ;
    Bian, Ruijie
    2022-04-01 | PDF
    The purpose of this project was to develop a method that could be used to assess the costs and benefits of collecting and maintaining a database on any asset of DOTD, to aid in determining for which assets it was worthwhile to collect data. The literature review established that a methodology for doing this does not already exist. The literature re ...
  • The Impacts of Deferred Maintenance in Minnesota
    The Impacts of Deferred Maintenance in Minnesota
    Fonseca-Sarmiento, Camila ;
    Zeerak, Raihana
    2022-04-01 | PDF
    The roadway system is critical to social development, economic growth, and the overall quality of life. In the U.S., the condition of highways and roads is being compromised due to several reasons including age deterioration, rising costs of construction, and a decline in funding. Similarly, in Minnesota, the majority of pavements are aging and in ...
  • Testing Methods for the Next Generation of Concrete Summary
    Testing Methods for the Next Generation of Concrete [Summary]
    Ruelke, Tim ;
    Ferraro, Christopher
    2022-04-01 | PDF
    University of Florida researchers performed a thorough literature review to identify existing test methods that can quantify the performance of concrete with respect to heat evolution, cracking, and durability at the mix design phase.
  • Stabilized Full Depth Reclamation SFDR Evaluation of Two Stabilization Products BASE ONE and Engineered Emulsion
    Stabilized Full Depth Reclamation (SFDR) – Evaluation of Two Stabilization Products: BASE ONE® and Engineered Emulsion
    Sabouri, Mohammadreza ;
    Wegman, Daniel E.
    2022-04-01 | PDF
    In previous Local Road Research Board (LRRB) studies there has been discussion but no empirical data regarding proprietary stabilizers. The LRRB leveraged an existing rehabilitation project on the border of Beltrami and Hubbard Counties to gather data and report on two stabilizers: engineered emulsion (used on the Beltrami County portion) and BASE ...
  • Improving Winter Maintenance for Open Graded Friction Course OGFC Pavements in Tennessee
    Improving Winter Maintenance for Open Graded Friction Course (OGFC) Pavements in Tennessee
    Onyango, Mbakisya ;
    Wu, Weidong
    2022-04-01 | PDF
    Open Graded Friction Course (OGFC) is a thin permeable surface layer on pavements constructed to ensure higher air void content that provides drainage from the pavement surfaces. This results in a safer riding surface, especially on wet conditions. OGFC pavements have been reported to reduce about 30% more wet crashes compared to densely graded sur ...
  • Identification of the Mechanisms That Produce Hydrogen Embrittlement on Posttensioning Members and the Effects of Galvanic Coupling on Bridge Tendons
    Identification of the Mechanisms That Produce Hydrogen Embrittlement on Post-tensioning Members and the Effects of Galvanic Coupling on Bridge Tendons
    Alexander, Christopher L ;
    Dukeman, David
    2022-04-01 | PDF
    A preliminary analysis of failed prestressing strands within a post-tensioned tendon on the Wando River Bridge in South Carolina showed signs of possible hydrogen embrittlement. One proposed source of hydrogen is through galvanic coupling that may exist between the galvanized steel duct and the steel strands. This coupling, if present, can promote ...
  • Development of GDOT UltraHigh Performance Concrete for Bridge Deck Closure Pours
    Development of GDOT Ultra-High Performance Concrete for Bridge Deck Closure Pours
    Stewart, Lauren K ;
    Kahn, Lawrence
    2022-04-01 | PDF
    The use of precast prestressed girders with composite precast deck panels along with the use of precast prestressed deck bulb-T girders provide for more economical bridges because of their ability to utilize accelerated bridge construction techniques. The use of concrete deck panels and deck bulb-T systems require the use of closure pours between t ...
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