TRB's National Cooperative Highway Research Program (NCHRP) Report 691: Mix Design Practices for Warm-Mix Asphalt explores a mix design method tailored to the unique material properties of warm mix asphalt technologies.
Warm mix asphalt (WMA) refers to asphalt concrete mixtures that are produced at temperatures approximately 50Â°F (28Â°C) or more cooler than typically used in the production of hot mix asphalt (HMA). The goal of WMA is to produce mixtures with similar strength, durability, and performance characteristics as HMA using substantially reduced production temperatures. [more]
TRB's Airport Cooperative Research Program (ACRP) Report 45: Optimizing the Use of Aircraft Deicing and Anti-Icing Fluids provides guidance on procedures and technologies designed to help reduce the use of aircraft deicing and anti-icing fluids (ADAF) while maintaining safe aircraft operations across the wide range of winter weather conditions found in the United States and Canada.
The report includes a series of best management practices that have the potential to be immediately implemented, and highlights the detailed findings and recommendations of experiments to evaluate holdove
TRB's Airport Cooperative Research Program (ACRP) Synthesis 22: Common Airport Pavement Maintenance Practices explores how airports implement a pavement maintenance management program, including inspecting and tracking pavement condition, scheduling maintenance, identifying necessary funds, and treating distresses in asphalt and concrete pavements.
TRB's National Cooperative Highway Research Program (NCHRP) Report 680: Manual for Emulsion-Based Chip Seals for Pavement Preservation examines factors affecting chip performance, highlights design and construction considerations, and explores procedures for selecting the appropriate chip seal materials. The report also contains suggested test methods for use in the design and quality control of chip seals.
Appendices A to J of NCHRP Report 680 provide further elaboration on the work
TRB's second Strategic Highway Research Program (SHRP 2) Report S2-R26-RR-2: Guidelines for the Preservation of High-Traffic-Volume Roadways explores the state of the practice for preservation treatments on high- and low-volume asphalt and concrete roadways. The report also includes suggested guidelines on the application of preservation treatments on high-volume roadways.
Errata (October 2011): Table 3.2 (pp. 20-21) contained incorrect information in the following rows; chip seal (single); chip seal (double); and hot in-place recycling. The table has been corrected in the online ve
TRB's National Cooperative Highway Research Program (NCHRP) Research Results Digest 351: Precision Statements for AASHTO Standard Methods of Test T 148, T 265, T 267, AND T 283 summarizes the findings of four interlaboratory studies conducted in 2009 and 2010 to develop precision statements for the AASHTO standard methods of measuring length of drilled concrete cores, laboratory determination of moisture content of soils, determination of organic content in soils by loss of ignition, and resistance of compacted hot-mix asphalt to moisture-induced damage.
TRB's National Cooperative Highway Research Program (NCHRP) Report 668: Framework for a National Database System for Maintenance Actions on Highway Bridges explores a potential framework that provides a uniform format for collecting, reporting, and storing information on bridge maintenance actions for inclusion in a national bridge maintenance database.
Appendixes A through E to NCHRP Report 668 provide detailed information on the different aspects of the research. Links to the individual appendixes are below.
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 411: Microsurfacing explores highway microsurfacing project selection, design, contracting, equipment, construction, and performance measurement processes used by transportation agencies in the United States and Canada.
Microsurfacing is a polymer-modified cold-mix surface treatment that has the potential to address a broad range of problems on today's highways.
TRB's Airport Cooperative Research Program (ACRP) Report 38: Understanding Airspace, Objects, and Their Effects on Airports provides a comprehensive description of the regulations, standards, evaluation criteria, and processes designed to protect the airspace surrounding airports.
The report is designed to help understand and apply the appropriate airspace design and evaluation criteria to ensure a safe operating environment for aircraft and to maintain airport operational flexibility and reliability, without unduly restricting desirable building development and attendant economic g
TRB's National Cooperative Highway Research Program (NCHRP) Report 667: Model Curriculum for Highway Safety Core Competencies presents course materials, including the instructor's guide and student workbook, for a fundamental highway safety training course. The course is designed to address the core competencies highway safety practitioners should have or acquire. An accompanying CD-ROM includes a brochure and short Microsoft PowerPoint presentation for marketing the training course.
The CD-ROM is also available for download from TRB's website as an ISO image. Links to the ISO image