TRB’s second Strategic Highway Research Program (SHRP 2) Report S2-R06D-RR-1: Testing to Identify Delaminations Between HMA Layers, Volume 1 describes development of nondestructive testing (NDT) techniques capable of detecting and quantifying delaminations in HMA pavements. The NDT techniques should be applicable to construction, project design, and network-level assessments. SHRP 2 Report S2-R...

TRB’s second Strategic Highway Research Program (SHRP 2) Report S2-R06D-RW-2: Testing to Identify Delaminations Between HMA Layers, Volume 2 describes the theoretical models used in the development of nondestructive testing (NDT) techniques capable of detecting and quantifying delaminations in HMA pavements. SHRP 2 Report S2-R06D-RW-2 was developed as part of SHRP 2 Renewal Project R06D that ge...

TRB’s second Strategic Highway Research Program (SHRP 2) Report S2-R05-RR-1: Precast Concrete Pavement Technology reviews the available precast concrete pavement (PCP) systems; summarizes PCP applications; and offers suggested guidelines for the design, fabrication, installation, and selection of PCP systems.

TRB’s National Cooperative Highway Research Program (NCHRP) Innovations Deserving Exploratory Analysis (IDEA) Final Report for NCHRP-IDEA Project 151: Development of a Simple Test to Determine the Low Temperature Strength of Asphalt Mixtures and Binders explores low temperature strength tests on asphalt mixture and asphalt binder beam specimens with the bending beam rheometer.

TRB’s National Cooperative Highway Research Program (NCHRP) Research Results Digest 382: Measuring Cement Particle Size and Surface Area by Laser Diffraction evaluates the practicality and effectiveness of the laser diffraction method to measure the particle size distribution and total surface area of cement powder.

TRB’s National Cooperative Highway Research Program (NCHRP) Innovations Deserving Exploratory Analysis (IDEA) Final Report for NCHRP-IDEA Project 143: The Guayule Plant a Renewable Domestic Source of Binder Materials for Flexible Pavement Mixtures explores the design of a flexible pavement mixture produced with little to no virgin petroleum based binder.

TRB’s second Strategic Highway Research Program (SHRP 2) Report S2-R06E-RR-1: Real-Time Smoothness Measurements on Portland Cement Concrete Pavements During Construction explores real-time smoothness measuring technologies for concrete paving. For the purposes of the report, real-time smoothness refers to measuring and evaluating the concrete pavement surface profile during construction along t...

TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 441: High Performance Concrete Specifications and Practices for Bridges documents the types of specifications and practices used by state transportation agencies to produce high performance concrete for bridges. The report also identifies specifications and practices reported as having improved concrete performance and t...

TRB's National Cooperative Highway Research Program (NCHRP) Research Results Digest 380: Guidelines for Geofoam Applications in Slope Stability Projects explores the use of expanded polystyrene-block geofoam for slope stabilization projects. For the purpose of the report, slope stabilization projects include new roadways as well as repair of existing roadways that have been damaged by slope ins...

TRB’s National Cooperative Highway Research Program (NCHRP) Report 733: High-Performance/High-Strength Lightweight Concrete for Bridge Girders and Decks presents proposed changes to the American Association of State Highway and Transportation Officials’ Load and Resistance Factor Design (LRFD) bridge design and construction specifications to address the use of lightweight concrete in bridge gir...

TRB’s National Cooperative Highway Research Program (NCHRP) Report 743: Predicting the Initial Retroreflectivity of Pavement Markings from Glass Bead Quality describes a laboratory test method to predict the initial retroreflectivity of pavement markings in the field based on the quality of the applied glass beads.

Asphalt cement materials are costly, and asphalt mixtures have environmental impacts. Alternatives are needed to reduce the cost and to decrease the emissions generated in production and construction without compromising performance. Asphalt-treated mixtures (ATMs) offer one alternative; however, state transportation agencies’ specifications for ATMs adversely affect the economic competitivenes...

TRB’s second Strategic Highway Research Program (SHRP 2) Renewal Project R21 has released a prepublication, non-edited version of a report titled Composite Pavement Systems Volume 1: HMA/PCC Pavements that investigates the structural and functional performance of surfacing a new portland cement concrete (PCC) pavement layer with a high-quality hot mix asphalt (HMA) layer. The second report...

TRB’s second Strategic Highway Research Program (SHRP 2) Renewal Project R21 has released a prepublication, non-edited version of a report titled Composite Pavement Systems Volume 2: PCC/PCC Pavements that investigates the structural and functional performance of placing a relatively thin, high-quality PCC surface atop a thicker PCC layer. The first report in the series,  Composite Pa...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2294 consists of 12 papers that explore reclaimed asphalt pavement mixtures; the effects of aggregate gradation on performance of Superpave mixtures; warm-mix asphalt mixtures and additives; and filler fractional voids.

TRB’s second Strategic Highway Research Program (SHRP 2) Report S2-R06C-RR-1: Using Both Infrared and High-Speed Ground Penetrating Radar for Uniformity Measurements on New HMA Layers that explores infrared imaging and ground penetrating radar technologies as non-destructive techniques to assess hot-mix asphalt (HMA) density and degree of segregation. The report also includes suggestions for ho...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2296 consists of 15 papers that explore dynamic modulus master curves; the self-healing capability of asphalt mixtures; permanent deformation of asphalt concrete in compression; asphalt concrete fatigue analysis; hot-mix asphalt permanent deformation; calibration and validation of overlay tester-based fatigu...

TRB Transportation Research Circular E-C170: Nanotechnology in Concrete Materials: A Synopsis explores promising new research and innovations using nanotechnology that have the potential to result in improved mechanical properties, volume change properties, durability, and sustainability in concrete materials.

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2295 consist of 8 papers that explore the measurement of hydraulic conductivity in porous mixes, surface friction performance of chip seals, asphalt pavement surface texture, moisture susceptibility testing of warm-mix asphalt mixes, material characteristics of asphalt mixtures relationship to highway noise,...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2290 consists of 21 papers that explore chemical admixtures, calcium hydroxide in hydrated pastes and mortars, predicting cement-admixture incompatibilities, surface resistivity measurements for quality assurance and acceptance, precision statement for concrete surface resistivity, the durability of concrete...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2293 consists of 15 papers that explore interface between asphalt concrete pavements and steel bridge decks, damage and thixotropy in asphalt mixtures, high-performance thin-lift overlays with reclaimed asphalt pavement and warm-mix asphalt technology, 4.75 nominal maximum aggregate size superpave overlay, a...

TRB’s National Cooperative Highway Research Program (NCHRP) Innovations Deserving Exploratory Analysis (IDEA) Final Report for NCHRP-IDEA Project 142: A Shape Memory Polymer Based Self-Healing Sealant for Expansion Joint explores a sealant for use in expansion joints in pavements and bridges to help prevent adhesive and cohesive failures through a self-healing mechanism, thereby minimizing the ...

TRB’s National Cooperative Highway Research Program (NCHRP) Report 724: Application of LADAR in the Analysis of Aggregate Characteristics describes a laser detection and ranging (LADAR)-based system for measurement of aggregate characteristics over a wide range of particle size.

TRB’s National Cooperative Highway Research Program (NCHRP) Report 726: A Guidebook for Nighttime Construction: Impacts on Safety, Quality, and Productivity provides suggested guidance on the conduct of nighttime highway construction and maintenance operations. These guidelines are based on best practices and strategies for nighttime operations that relate to the safety of workers and the trave...

TRB’s Transportation Research Circular E-C165: Alternative Binders for Sustainable Asphalt Pavement contains seven technical papers and summaries of presentations made at a January 22, 2012, workshop that explored material characterization and field validation for short- and long-term performance of various sustainable asphalt pavements.

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2267 consists of seven papers that examine aggregate morphology analysis, mechanical properties of aggregate base–granular subbase materials, polish resistance of fine aggregates, steel slag aggregate used in portland cement concrete, aggregate–bitumen bond strengths and asphalt mixture durability, aggregate...

TRB’s National Cooperative Highway Research Program (NCHRP) Research Result Digest 374: A Proposed Technology Evaluation Program for Warm-Mix Asphalt summarizes the key findings of a project that was charged with defining a warm-mix asphalt technology evaluation program that would be compatible with a centralized system of testing, evaluation, and data reporting of engineering materials for the...

TRB’s National Cooperative Highway Research Program (NCHRP) Report 719: Calibration of Rutting Models for Structural and Mix Design highlights proposed revisions to the Mechanistic–Empirical Pavement Design Guide (MEPDG) and software to incorporate three alternative rut-depth prediction models that rely on repeated load (triaxial) permanent deformation or constant height testing to provide the ...

The Bridge Design Section of the Louisiana Department of Transportation and Development (DOTD) is transitioning statewide to load and resistance factor design (LRFD) for reinforced concrete structures. This change in design procedures requires testing more samples for permeability to ensure adequate protection against corrosion. The personnel hours for subjecting these samples to the traditiona...

TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 431: Practices to Manage Traffic Sign Retroreflectivity includes examples of practices that illustrate how different types of transportation agencies might meet federal retroreflectivity requirements for traffic signs.