The May-June 2017 edition of the TR News explores the role of transportation in economic development. Articles feature information about benefit-cost analysis, freight production models, transportation satellite accounts, and right sizing strategies. The TR News is TRB's bimonthly magazine featuring timely articles on innovative and state-of-the-art research and practice in all modes of transpo...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2656 consists of 8 papers that explore geological engineering, including: Comparison of California Bearing Ratio and Pin Puncture Strength Testing Used in the Evaluation of Geotextiles Coupled Thermo-Hydro-Mechanical Analysis of Freeze–Thaw Behavior of Pavement Structure over a Box Culvert Jump-Starting a Ge...

TRB has released its requirements for submitting papers for presentation at the 2018 TRB Annual Meeting and/or publication in the Transportation Research Record: Journal of the Transportation Research Board . This guide covers the organization and formatting of manuscripts for peer review and for publication, as well as instructions for submission. Papers that do not follow the guidelines will ...

TRB's National Cooperative Highway Research Program (NCHRP) latest Ready Results examines NCHRP Research Results Digest 391 : Modulus-Based Construction Specification for Compaction of Earthwork and Unbound Aggregate. Proper compaction of roadway base and subbase is vital to ensure good pavement performance throughout its life span. Modulus, a measure of stiffness, predicts the performance of p...

TRB's National Cooperative Highway Research Program (NCHRP) latest Research Topic Highlights explores the use and application of Warm Mix Asphalt (WMA). This fact sheet summarizes the use of WMA and applications in the past decade. WMA is produced at temperature that is cooler than hot mix asphalt (HMA), reducing worker exposure to asphalt fumes as well as reducing emissions. The publication pr...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2655 consists of 10 papers that explore geological engineering, including: Evaluating Constructed Aggregate Layers of Working Platforms and Flexible Pavements: Adequacy of In-Place Quality Control and Quality Assurance Techniques Results of Soaked and Unsoaked California Bearing Rate Tests on Unbound Aggrega...

A featured article in the March-April 2017 issue of the TR News highlights photos from the 96th TRB Annual Meeting, January 8-12, 2017. The article features photographs of sessions, workshops, committee meetings, and awards. Bruce M. Smith, Apperson Crump PLC, and General Counsel, Memphis Area Transit Authority, delivered the delivered the 2017 Thomas B. Deen Distinguished Lecture on “Ethical I...

A featured article in the March-April 2017 issue of the TR News highlights photos from the 96th TRB Annual Meeting, January 8-12, 2017. The article features photographs of sessions, workshops, committee meetings, and awards. Bruce M. Smith, Apperson Crump PLC, and General Counsel, Memphis Area Transit Authority, delivered the delivered the 2017 Thomas B. Deen Distinguished Lecture on “Ethical I...

TRB's National Cooperative Highway Research Program (NCHRP) Research Report 847: Variability of Ignition Furnace Correction Factors explores the significant influences that affect the variability of asphalt and aggregate correction factors for ignition furnaces. The report presents a proposed practice in American Association of State Highway and Transportation Officials (AASHTO) standard format...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2631, includes 16 papers that explore information related to asphalt materials and mixtures, including: New and Simpler Cracking Test Method for Asphalt Mix Designs Use of Nonlinear Acoustic Measurements for Estimation of Fracture Performance of Aged Asphalt Mixtures Viscoelasticplastic–Fracture Modeling of ...

TRB's National Cooperative Highway Research Program (NCHRP) Research Report 843: Long-Term Field Performance of Warm Mix Asphalt Technologies compares material properties and field performance of warm mix asphalt (WMA) and control hot mix asphalt (HMA) pavement sections constructed at 28 locations across the United States. It explores significant determinants for each type of distress and poten...

On March 14, 2017, TRB’s Long-Term Pavement Performance (LTPP) Committee and Long-Term Bridge Performance (LTBP) Committee sent a joint letter report to Walter C. "Butch" Waidelich, Jr., acting deputy administrator of the Federal Highway Administration (FHWA), and Frederick G. "Bud" Wright, executive director of the American Association of State Highway and Transportation Officials (AASHTO). Th...

TRB's National Cooperative Freight Research Program (NCFRP) Research Report 37: Using Commodity Flow Survey Microdata and Other Establishment Data to Estimate the Generation of Freight, Freight Trips, and Service Trips: Guidebook provides policy makers with improved establishment-level models that estimate the Freight Trip Generation (FTG), the number of vehicle trips produced and attracted at ...

A featured article in the November-December 2016 issue of the TR News highlights the challenges of freight transportation with regards to meeting new emissions standards. The TR News is TRB's bimonthly magazine featuring timely articles on innovative and state-of-the-art research and practice in all modes of transportation. It also includes brief news items of interest to the transportation com...

TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 501: Pavement Management Systems: Putting Data to Work documents current pavement management practices in state and provincial transportation agencies. The report focuses on the use of pavement management analysis results for resource allocation, determining treatment cost-effectiveness, program development, and communication...

TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 499: Alternate Design/Alternate Bid Process for Pavement-Type Selection documents the state of the practice in alternate design/alternate bid (ADAB) for pavement-type selection by highway agencies. ADAB is a contracting technique that allows the pavement-type selection decision to be made as part of the procurement process. C...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2576 consists of 12 papers that explore asphalt materials and mixtures, including: Nondestructive Field Evaluation of Aging Levels of Rejuvenated Asphalt Concrete Pavements Development of a Test Protocol to Measure Uniaxial Fatigue Damage and Healing Comparison of Fracture Cracking Parameters from Monotonic ...

TRB's National Cooperative Highway Research Program (NCHRP) Report 820: Framework for a Pavement-Maintenance Database System provides a uniform format for collecting, reporting, and storing information on pavement-maintenance actions. The framework may facilitate usage of the data in cost-benefit analyses, evaluation of the effects of maintenance on pavement performance, selection of maintenanc...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2573 consists of 20 papers that explore construction, including: Using Parametric Modeling to Estimate Highway Construction Contract Time Civil Integrated Management for Highway Infrastructure: Case Studies and Lessons Learned Comparing Construction Manager–General Contractor and Federal Early Contractor Inv...

TRB's E-Circular 216: International Experience and Perspective of Pavement Texture Measurements and Evaluation includes a synopsis of five presentations at the workshop “International Experience and Perspective of Pavement Texture Measurements and Evaluation” held at TRB's 94th Annual Meeting, January 11-15, 2015, in Washington, D.C. The presentations explore methods used in the United States, ...

TRB's National Cooperative Highway Research Program (NCHRP) Innovations Deserving Exploratory Analysis (IDEA) Report 171: Producing a Sustainable, Bio-Based Alternative to Petroleum-Based Asphalt Binder explores adding bio-binder to crumb-rubber-modified (CRM) asphalt to enhance its low-temperature rheological properties while improving workability and reducing phase separation. The application...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2578 consists of 10 papers that explore geological engineering, including: Pavement Working Platforms Constructed with Large-Size Unconventional Aggregates Optimizing Stability and Stiffness Through Aggregate Base Gradation Influence of Unbound Material Type and Input Level on Pavement Performance Using Mech...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2591 consists of 13 papers that explore pavement management, including: Full-Depth Reclamation: Cost-Effective Rehabilitation Strategy for Low-Volume Roads Fiber Effect on Interfacial Bond Between Concrete and Fiber-Reinforced Mortar Validation of Staged Construction Pavement Design with the Falling Weight D...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2574 consists of 15 papers that explore asphalt, including: Fatigue Performance of Re-Refined Engine Oil Bottom–Modified Asphalt: Laboratory Study Study of Evolution of Asphalt Binder Microstructure Resulting from Aging and Tensile Loading Effect of Polymer and Oil Modification on the Aging Susceptibility of...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2577 consists of 11 papers that explore concrete materials, including: Field Investigation of In-Service Performance of Concrete Bridge Decks in Pennsylvania Microencapsulation of Calcium Nitrate for Concrete Applications Reducing Joint Damage in Concrete Pavements: Quantifying Calcium Oxychloride Formation ...

TRB's Airport Cooperative Research Program (ACRP) Report 159: Pavement Maintenance Guidelines for General Aviation Airport Management provides guidance to general aviation airport managers in determining the most cost-efficient and appropriate preventative maintenance solution to common pavement issues. In addition to the guidebook, two additional products were developed. The Airport Pavement M...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2575 consists of 22 papers that explore asphalt materials and mixtures, including: Performance of a Highly Polymer-Modified Asphalt Binder Test Section at the National Center for Asphalt Technology Pavement Test Track Using Polymer Modification and Rejuvenators to Improve the Performance of High Reclaimed As...

TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 495: Use of Reclaimed Asphalt Pavement and Recycled Asphalt Shingles in Asphalt Mixtures summarizes current practices for the use of reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS) in the design, production, and construction of asphalt mixtures. It focuses on collecting information about the use, rather t...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2590 consists of 15 papers that explore pavement management, including: Research Implementation of AASHTOWare Pavement ME Design in Louisiana New Approach to Determining Concrete Slab Lift-Off by Use of Interfacial Fracture Mechanics Concepts Verification of Time–Temperature Superposition Principle for Shear...

TRB's National Cooperative Highway Research Program (NCHRP) Innovations Deserving Exploratory Analysis (IDEA) Report 173: Graphene Nanoplatelet (GNP) Reinforced Asphalt Mixtures: A Novel Multifunctional Pavement Material investigates the mechanical and compaction properties of GNP reinforced asphalt binders and mixtures. GNP binders and mixtures are regarded as a potential candidate for the new...