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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 5061 - 5080 of 36022 results
  • Investigating Available StateoftheArt Technology for Determining Needed Information for Bridge Rating Strategies
    Investigating Available State-of-the-Art Technology for Determining Needed Information for Bridge Rating Strategies
    Karshenas, Afshin ;
    Naghavi, Babak
    2020-01-01 | PDF
    In this report, nondestructive test (NDT) methods are evaluated in the context of providing input parameters to perform bridge load rating calculations for different bridge types. Relevant NDT methods are identified based on diverse technologies including mechanical impact, acoustic, electromagnetic, electrical and chemical, cuclear, and miscellane ...
  • Develop System To Render MechanisticEmpirical Traffic Data for Pavement Design Workshop PPT Slides
    Develop System To Render Mechanistic-Empirical Traffic Data for Pavement Design: Workshop PPT Slides
    Walubita, Lubinda F. ;
    Lee, Sang Ick
    2020-01-01 | PDF
    This workshop PPT slides demonstrate the key findings of Texas Department of Transportation (TxDOT) Project 0-6940 Develop System to Render Mechanistic-Empirical Traffic Data for Pavement Design. It can be used as an instructor guide to provide in-depth understanding of site-specific ME-compatible traffic data for pavement design.
  • US Biofuel Production and Policy Implications for Land Use Changes in Malaysia and Indonesia
    US Biofuel Production and Policy: Implications for Land Use Changes in Malaysia and Indonesia
    Taheripour, Farzad ;
    Tyner, Wallace E.
    2020-01-01 | PDF
    It has been argued that the US biofuel policy is responsible for the land use changes in Malaysia and Indonesia (M&I). In this paper, following a short literature review that highlights the relevant topics and issues, we develop analytical and numerical analyses to evaluate the extent to which production of biofuels in the US alters land use in M&I ...
  • Transit in Flex Examining Service Fragmentation of New AppBased OnDemand Transit Services
    Transit in Flex: Examining Service Fragmentation of New App-Based, On-Demand Transit Services
    Weinreich, David ;
    Skuzinski, Thomas
    2020-01-01 | PDF
    The transportation industry may be going through its largest technological revolution in a century, with new forms of on-demand transportation capitalizing on innovations like the Global Positioning System (GPS) chips to develop app-based, on-demand transportation, connecting user and driver, known alternatively as ridesourcing, ride-hailing, Trans ...
  • Feasibility Study of GRS Systems for Bridge Abutments in Oklahoma Influence of Facing and Aggregate Fill on Performance
    Feasibility Study of GRS Systems for Bridge Abutments in Oklahoma: Influence of Facing and Aggregate Fill on Performance
    Hatami, Kianoosh ;
    Doger, Ridvan
    2020-01-01 | PDF
    This document reports a study where load-bearing capacity, deformations and construction speed of different GRS abutment models were compared in the laboratory at full scale. Six 8 ft-high, instrumented abutment models were constructed inside an outdoor test station in order to study the influences that the choice of facing type, reinforcement spac ...
  • Asset Valuation Practices and Functionality
    Asset Valuation Practices and Functionality
    Bittner, Jason ;
    Silber, Hannah
    2020-01-01 | PDF
    Providing a better understanding of the value of the State of Oklahoma’s transportation assets as well as the maintenance activities necessary to keep them in a state of good repair is a key component of sustainable long-term asset management. This report enhances asset management planning efforts to better meet Federal requirements by providing a ...
  • Development of an NDT Tool for inSitu Assessment of Prestressed Loss
    Development of an NDT Tool for in-Situ Assessment of Prestressed Loss
    Zhong, Bibo ;
    Zhu, Jinying
    2020-01-01 | PDF
    The research objective is to develop a non-destructive testing (NDT) method to evaluate the prestress loss in prestressed concrete bridge girders using ultrasonic waves. The work principle is based on acoustoelastic effect - ultrasonic wave velocity varies with stress level in prestressed concrete. A self-reference test setup was proposed to measur ...
  • Concrete Box Beam Risk Assessment and Mitigation Volume 1Evolution and Performance
    Concrete Box Beam Risk Assessment and Mitigation: Volume 1—Evolution and Performance
    Frosch, Robert J. ;
    Williams, Christopher S
    2020-01-01 | PDF
    Adjacent box beam bridges have a history of poor long-term performance including premature deterioration and failures. Leaking joints between box beams allow chloride-laden water to migrate through the superstructure and initiate corrosion. The nature of this deterioration leads to uncertainty of the extent and effect of deterioration on structural ...
  • Evaluation of Carbon Char in HotMix Asphalt Mixture
    Evaluation of Carbon Char in Hot-Mix Asphalt Mixture
    Gao, Ye ;
    Islam, Shuvo
    2020-01-01 | PDF
    Carbon char is a by-product of the pyrolysis of waste tires. The use of carbon char would promote sustainability and economy. Carbon char is similar to carbon black, a potential additive for hot-mix asphalt (HMA). Previously carbon black in HMA showed the potential to reduce rutting potential, temperature susceptibility, and low-temperature crackin ...
  • Development of Rapid Pavement Repair Materials
    Development of Rapid Pavement Repair Materials
    Shin, Alex Hak-Chul ;
    Walker, Denita
    2020-01-01 | PDF
    Being that pavement repair and construction represents a significant percentage of federal and state funding, new materials are being investigated to reduce cost and generate a more resilient material. The goal of the project is to develop cost-effective, high performance concrete materials for rapid pavement repair minimizing environmental impact. ...
  • Feasibility Study of Development of UltraHigh Performance Concrete UHPC for Highway Bridge Applications in Nebraska
    Feasibility Study of Development of Ultra-High Performance Concrete (UHPC) for Highway Bridge Applications in Nebraska
    Mendonca, Flavia ;
    El-Khier, Mostafa Abo
    2020-01-01 | PDF
    Ultra-high performance concrete (UHPC) is a new class of concrete that has superior mechanical, durability, and workability properties that far exceed those of conventional concrete. To achieve these properties, a specific mix design with a very dense internal structure, fiber reinforcement, and low water-to-binder ratio (w/b) is commonly used. The ...
  • Driver Response to Dynamic Message Sign Safety Campaign Messages
    Driver Response to Dynamic Message Sign Safety Campaign Messages
    Shealy, Tripp ;
    Kryschtal, Pamela
    2020-01-01 | PDF
    Messages like “May the 4th be with you, text I will not” are increasingly used to catch drivers’ attention. The development and use of nontraditional safety messages are distinctly different than messages previously displayed on highway signs. These message attempt to provoke an emotional response and may reference themes like popular culture, spor ...
  • 4x8 Concrete Cylinders for Compressive Strength Testing
    4x8 Concrete Cylinders for Compressive Strength Testing
    Lo, Patrick ;
    Van Dam, Tom
    2020-01-01 | PDF
    This report to Pavement & Materials Partnering Committee (PMPC) addresses the concrete cylinder size allowed for compressive strength testing on Caltrans projects. Historically, Caltrans has required the use of 6x12-in. cylinders when verifying concrete’s compressive strength for contract acceptance. To align the Department’s practice with national ...
  • 2019 MassDOT Research Peer Exchange Implementing Transportation Research June 1214 2019
    2019 MassDOT Research Peer Exchange: Implementing Transportation Research: June 12-14, 2019
    United States. Department of Transportation. Research and Special Programs Administration. John A. Volpe National Transportation System Center
    2020-01-01 | PDF
    The Massachusetts Department of Transportation (MassDOT) conducted a peer exchange with transportation research peers from six other State Departments of Transportation (State DOTs) on June 12-14, 2019 in Cambridge, MA. The peer exchange was conducted in accordance with 23 CFR 420, which requires that agencies use a portion of State Planning and Re ...
  • Exploring the Changing Faces of Housing Development and Demand in California Millennials Casitas and Reducing VMT
    Exploring the Changing Faces of Housing Development and Demand in California: Millennials, Casitas, and Reducing VMT
    Volker, Jamey Matthew Bowman
    2020-01-01 | PDF
    Changes are coming to housing development and demand in California. The state’s sprawling development patterns have come under increasing scrutiny as the state struggles to reduce its greenhouse gas emissions, abate a decades-long housing supply and affordability crisis, and meet the needs of the largest generation in American history – the millenn ...
  • Performance of FiberReinforced SelfConsolidating Concrete for Repair of Bridge SubStructures and FiberReinforced Super Workable Concrete for Infrastructure Construction Volume IV
    Performance of Fiber-Reinforced Self-Consolidating Concrete for Repair of Bridge Sub-Structures and Fiber-Reinforced Super Workable Concrete for Infrastructure Construction [Volume IV]
    Volz, Jeffery S. ;
    Drury, Jonathan
    2020-01-01 | PDF
    The main objectives of this research project were to: (1) Develop mix designs and examine the fresh and hardened properties of self-consolidating concrete (SCC) and fiber-reinforced SCC (FR-SCC) using locally-available materials, steel and synthetic macro-fibers, and varying percentages of a Type-K shrinkage-compensating cement; (2) Investigate com ...
  • Enhanced Moisture Sensitivity Study for Asphalt Concrete Pavements Research Brief
    Enhanced Moisture Sensitivity Study for Asphalt Concrete Pavements [Research Brief]
    Solaimanian, Mansour
    2020-01-01 | PDF
    Asphalt pavements suffer moisture damage through loss of adhesion between asphalt and aggregate (i.e., stripping of asphalt from aggregate) and due to cohesive failure of the binder. Both phenomena contribute to reductions in strength or stiffness of the asphalt concrete layer that lead to pavement distresses. Accurately predicting and mitigating m ...
  • Slip Coefficient Testing of ASTM A709 Grade 50CR Steel and Dissimilar Metal SlipCritical Bolted Connections
    Slip Coefficient Testing of ASTM A709 Grade 50CR Steel and Dissimilar Metal Slip-Critical Bolted Connections
    Provines, Jason ;
    Abebe, Haddis
    2020-01-01 | PDF
    The purpose of this study was to conduct slip coefficient testing of bolted connections made from ASTM A709 Grade 50CR steel (hereinafter “50CR steel”) to determine how they fit into the current AASHTO LRFD Bridge Design Specifications (hereinafter “the AASHTO BDS”) surface condition classifications. Currently, 50CR steel is not included in these c ...
  • Development of a Tool for Estimating Bridge Construction Contract Time
    Development of a Tool for Estimating Bridge Construction Contract Time
    Jentink, Ross ;
    Bossert, Justin
    2020-01-01 | PDF
    The purpose of this project was to develop a tool, available at mndot.gov/research/reports/2020/20201S.xlsm, that estimates bridge construction contract time based on various controlling activities of bridge construction. As part of this project, various transportation departments throughout the United States were interviewed on how contract time i ...
  • Evaluating the Effectiveness of Regulatory and Warning Signs on Driver Behavior near Highway Rail Crossings
    Evaluating the Effectiveness of Regulatory and Warning Signs on Driver Behavior near Highway/ Rail Crossings
    Codjoe, Julius ;
    Saunders, William
    2020-01-01 | PDF
    There are approximately 211,893 highway-rail grade crossings nationwide with approximately 5,200 in Louisiana. The number of fatalities and injuries at highway-rail grade crossings have proceeded to increase since 2014. Signage has been a choice solution for reducing crashes at highway-rail grade crossings. This study therefore evaluates the effect ...
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