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  • 9/13/2017
  • Safe Main Street Highways Part 1: Washington State Collision Data and Geocoding

    This project contributes to the Washington State Strategic Highway Safety Plan, whose goals are to achieve zero road fatality and serious injury by 2030 and to reduce the number of pedestrians and bicyclists involved in motor-vehicle collisions on state highways. The study focused on “main street highways” (MSPs), which are stretches of State Routes that also act as main streets for the local populations. This report covers Part I of this study, which collected an inventory of collision data in Washington state from 2001 to 2012. The project tallied those collisions that had been geocoded, and the report describes the various methods used for geocoding. More than 90 percent of the collisions had been geocoded for 2010, 2011, and 2012, but only pedestrian and bicyclist collisions had been geocoded for the years between 2001 and 2009.

  • 6/29/2017
  • Safety Edge- Pavement Edge Treatment

    Pavement edge drop-off on highways has been linked to many serious crashes, including fatal collisions. To mitigate vertical drop-offs, FHWA advocates installing the Safety EdgeSM on pavements during paving or resurfacing projects. This technology allows drivers who drift off highways to return to the pavement safely.

  • 5/13/2010
  • Seal Coat and Surface Treatment Manual

    Seal coats, also known as chip seals, are simple, relatively inexpensive pavement surfaces that are highly effective if adequate care is taken in the planning and execution of the work. A seal coat is an application of a layer of asphalt binder covered with a layer of aggregate applied to an existing paved surface.

  • 3/23/2002
  • Service Life Prediction Based on Sorptivity for Highway Concrete Exposed to Sulfate Attack and Freeze-Thaw Conditions

    This report documents a study that investigated penneability as an indicator of the general durability of hydraulic: cement concrete. Since many concrete deterioration mechanisms depend on the ingress of moisture and other materials into the concrete, it was theorized that permeability might be a good indicator of durability potentiaL During the project, it was determined that sorptivity is the most relevant transport characteristic of the concrete. A test method for sorptivity was therefore developed, which has two different setups, in order to better reproduce the exposure condition being simulated.

  • 1/22/2005
  • Slurry Seal Application Checklist

    This pocket-sized book is a checklist for slurry seal application. It covers responsibilities, project inspection, and common problems and solutions.

  • 10/30/2013
  • Smart Pavement Monitoring System

    This report describes the efforts undertaken to develop a novel self-powered strain sensor for continuous structural health monitoring of pavement systems under the Federal Highway Administration. Efforts focused on designing and testing a sensing system that consists of a novel self-powered wireless sensor capable of detecting damage and loading history for pavement structures. The developed system is based on the integration of a piezoelectric transducer with an array of ultra-low-power floating gate computational circuits. A miniaturized sensor was developed and tested. The sensor is capable of continuous battery-less monitoring of strain events integrated over the occurrence duration time.

  • 2/22/2001
  • Superpave Mixture Design Guide

    This document is a companion to the NAPA Superpave Construction Guidelines. It is a guide to designers to maximize the benefits of Superpave while avoiding potential problems.

  • 8/15/2011
  • Sustainable Concrete Pavements: A Manual of Practice

    The intended audience includes decision-makers and practitioners in both owner-agencies and supply, manufacturing, consulting, and contractor businesses. The reader will find individual chapters with the most recent technical information and best practices related to concrete pavement design, materials, construction, use/operations, renewal, and recycling. In addition, they will find chapters addressing issues specific to pavement sustainability in the urban environment and to the evaluation of pavement sustainability.

  • 6/23/2001
  • The Effects of Higher Strength and Associated Concrete Properties on Pavement Performance

    The goal of this project was to develop recommendations for PCC properties and materials characteristics found in higher strength JPCP's with improved long-term performance as determined by joint spalling and faulting, and transverse slab cracking. Primary project variables were pavement age, climate, traffic, distress levels, and types, joint spacing, and compressive strength.

  • 4/16/2011
  • The Many Benefits of Warm Mix Asphalt

    You’ve heard of cold mix and warm mix. Now the advantages of both have been combined ... in warm mix. This fact sheet provides information about why FHWA is promoting this technology and some examples of its use in Kansas.

  • 4/16/2011
  • The Safety Edge is Gaining Ground

    This fact sheet describes why the Safety Edge is considered a more effective technology than other methods for creating an angled edge on asphalt pavement, and how to start using the technology on your paving projects. Kansas LTAP has also two Safety Edge shoes for a loan to use on local roads.

  • 10/1/2017
  • Thin Concrete Overlays

    Thin concrete overlays have been successfully used in the United States for extending the life of existing concrete, asphalt, or composite pavements. These overlays can accommodate a variety of needs, such as extending performance lives by as much as 15 to 20 years, meeting rapid construction requirements, and conforming to any specific traffic management constraints (Tayabji et al. 2009). In addition, a properly designed and constructed concrete overlay requires little maintenance over its service life, resulting in reduced life-cycle costs. Concrete overlays less than 6 inches (152 mm) thick are commonly identified as “thin” concrete overlays, while the term “ultra-thin” is sometimes used to refer to overlays less than 4 inches (102 mm) thick.

  • 1/22/2003
  • Thin Hot-Mix Asphalt Overly

    This pocket-sized book is a checklist for a thin hot-mix asphalt overlay. It covers preliminary responsibilities, pre-overlay and project inspection, opening to traffic, and common problems and solutions.

  • 6/1/2015
  • Tools for Improving the Sustainability and Durability of Concrete

    This project’s innovation is that it focuses precisely on these length scales by using cutting-edge, experimental measurement techniques combined with computer modeling approaches. Researchers have been conducting the study in two phases. The first phase focused on the mechanisms of cement hydration, including the influence of aluminate and sulfations, and the second phase is currently investigating the influence of organic admixtures.

  • 10/1/2017
  • Traffic Control Strategies for Concrete Pavement Rehabilitation and Reconstruction

    This Tech Brief provides an overview of work zone traffic management fundamentals and provides recommended traffic management strategies specific to concrete pavement rehabilitation and reconstruction. It also presents example traffic control and management strategies for concrete pavements, noting that these are used to illustrate the concepts but should be tempered based on local traffic control regulations and requirements.

  • 3/16/2017
  • Transit Enterprise Architecture and Planning Framework

    This report describes the connections between a transit agency’s business and the technology, assists with building the business case for specific investments, highlights different financing options, provides guidance on an enterprise-wide approach to create more efficient and effective system deployments, and provides a method to show the benefits of a technology investment.

  • 6/20/2013
  • Ultra-High Performance Concrete: A State-of-the-Art Report for the Bridge Community

    The report documents the state of the art with regard to the research, development, and deployment of UHPC components within the U.S. highway transportation infrastructure. More than 600 technical articles and reports covering research and applications using UHPC have been published in English in the last 20 years, with many more published in other languages. The report includes information about materials and production, mechanical properties, structural design, and structural testing, durability and durability testing, and actual and potential applications. The report concludes with recommendations for the future direction for UHPC applications in the United States.

  • 1/15/2013
  • Unpaved Road Dust Management

    This handbook provides broad programmatic aspects of unpaved road management. It is based on observations made during a national scan tour and provides useful and insightful excerpts of real-world examples and includes practical how-to instructions for determining what type of treatment may be needed for different situations. It ultimately strives to encourage road managers to think broadly about the process of unpaved road management rather than just focusing on a specific type of chemical treatment.

  • 9/1/2017
  • Validation of Pavement Performance Measures Using Long-Term Pavement Performance Data

    Accordingly, FHWA undertook a study to validate the pavement performance measures and to demonstrate their use within (5,6) the pavement decision-making process. Accomplishing these objectives required translation of LTPP pavement condition data to condition metrics in accordance with the NPRM. For asphalt concrete (AC) percent cracking, the translation was done based on the NPRM and Final Rule. A database containing the translated data and other supporting information was created; it is available via LTPP InfoPave™ (https://infopave.fhwa.dot.gov/). This database supported all analyses for the study in question, and highlights from those analyses are presented in this TechBrief.

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