|This report is an archived publication and may contain dated technical, contact, and link information|
Publication Number: FHWA-HRT-05-157
Date: October 2003-September 2005
Technical Publications Catalog
Seasonal Monitoring Program-One Stop Shopping!
As the temperature and moisture content of paved roads change over the course of a day and course of a year, the structural characteristics of the pavement layers also change. Those changes affect how well the pavement responds to traffic loads and how long the pavement will last. However, the magnitude of those changes and the relationships involved are not well understood, making them difficult to address with any degree of confidence when designing and evaluating pavements. To overcome this limitation, the Strategic Highway Research Program established a seasonal monitoring program (SMP) within its LTPP program. The report states that the objective of the SMP, as established in the early 1990s, was to "provide data needed to attain a fundamental understanding of the magnitude and impact of temporal variations in pavement response and material properties due to the separate and combined effects of temperature, moisture and frost/thaw variations."
Office of Infrastructure Research and Development (R&D) Pavements
FHWA's Office of Infrastructure R&D conducts research that improves the design, construction, operation, and management of pavements and structures. Located at the Turner-Fairbank Highway Research Center (TFHRC), the office has an active outreach program that identifies future targets of opportunity and researchers who pursue advanced initiatives that drive innovative programs to serve customers' needs.
LTPP: Year in Review 2004
In 2004, the LTPP program continued working toward optimizing the public's investment in the highway system by providing the information, data, and products that highway engineers and managers need to design, build, maintain, and manage cost-effective and better performing roads. This report outlines LTPP's 2004 program area accomplishments and how the Transportation Equity Act for the 21st Century (TEA-21) extension impacted the LTPP program.
The Concrete Pavement Road Map, Long-Term Plan for Concrete Pavement Research and Technology, An Executive Summary
The Concrete Pavement (CP) Road Map is a comprehensive and strategic plan for concrete pavement research that will guide the investment of research dollars for the next several years. It will result in technologies and systems that help the concrete pavement community meet the paving needs of today, and the as-yet unimagined paving challenges of tomorrow. In short, the CP Road Map will result in a new generation of concrete pavements for the 21st century.
Achieving a High Level of Smoothness in Concrete Pavements without Sacrificing Long-Term Performance
This document is a technical summary of the report Achieving a High Level of Smoothness in Concrete Pavements Without Sacrificing Long-Term Performance published by FHWA in June 2005.
TFHRC Technical Reference Center and http://www.fhwa.dot.gov/publications/research/infrastructure/pavements/05069/index.cfm
Structural Factors of Jointed Plain Concrete Pavements: SPS-2-Initial Evaluation and Analysis
The SPS-2 experiment, Strategic Study of Structural Factors for Jointed Plain Concrete Pavements (JPCP), is one of the key components of the Long-Term Pavement Performance (LTPP) program. The main objective of this experiment is to determine the relative influence and long-term effectiveness of JPCP design features (including slab thickness, PCC flexural strength, base type and drainage, and slab width) and site conditions (traffic, subgrade type, climate) on performance. This report documents the first comprehensive review and evaluation of the Specific Pavement Studies (SPS)-2 experiment. Thirteen SPS-2 projects have been constructed with one additional site under construction. At each site, there are 12 core sections plus various numbers of supplemental sections.
Guide for Curing of Portland Cement Concrete Pavements, Volume I
This document provides guidance on details of concrete curing practice as they pertain to construction of portland cement concrete (PCC) pavements. The guide is organized around the major events in curing pavements: curing immediately after placement, curing during the period after final finishing, terminating curing, and evaluating effectiveness of curing. Information is presented on selection of curing materials and procedures, analysis of concrete properties and jobsite conditions, and on ways to adjust curing practice to account for specific project conditions.
TFHRC Technical Reference Center and www.fhwa.dot.gov/pavement/pub_details.cfm?id=344
Estimating Cumulative Traffic Loads, Volume II: Traffic Data Assessment and Axle Load Projection for the Sites with Acceptable Axle Weight Data, Final Report for Phase 2
In 1998, FHWA sponsored a study to estimate traffic loads on LTPP sites. This report contains findings of the second phase of the study. Phase 2 includes the assessment of the overall quality of traffic data for all 890 LTPP traffic sites, and the projections of axle loads for all LTPP sites with adequate traffic data. Also included are the distribution of comprehensive traffic data reports to all participating agencies and the incorporation of comments regarding traffic projections received from the agencies.
TFHRC Technical Reference Center
Incremental Costs and Performance Benefits of Various Features of Concrete Pavements, Final Report
This report presents a methodology for quickly assessing the relative costs and benefits of incorporating various design features in PCC pavements. That methodology has been incorporated into an analytical software tool that can be used by pavement design engineers who are interested in investigating the cost versus performance tradeoffs associated with the selection of different design features during the PCC pavement design process. The tool is not intended to provide absolute answers on the effect of different design features, but rather to provide insight into general performance and cost trends associated with the use of those design features.
Characteristics of Emerging Road Users and Their Safety
This study was undertaken to clarify the operational characteristics of an increasingly diverse group of trail and other nonmotorized transportation users. Three "Ride for Science" data collection events were conducted to obtain the physical dimensions, turning capabilities, lateral operating space, acceleration, speed, and stopping sight distance of trail users. The results confirmed the great diversity in the operating characteristics of various road and trail user types.
TFHRC Technical Reference Center
Computer-Based Guidelines for Concrete Pavements, Volume I: Project Summary
This report documents enhancements incorporated in the (High PERformance PAVing) HIPERPAV II software. Enhancements made within this project include the addition of two major modules: a module to predict the performance of JPCP as affected by early-age factors and a module to predict the early-age behavior and early of continuously reinforced concrete pavement. This report summarized the work conducted to enhance the HIPERPAV concrete pavement design guidelines. This is the first volume in a series of three volumes.
TFHRC Technical Reference Center and www.ntis.gov, PB2005105417
Computer-Based Guidelines for Concrete Pavements, Volume II: Design and Construction Guidelines and HIPERPAV II User's Manual
This report documents enhancements incorporated in the HIPERPAV II software. Enhancements made within this project include the addition of two major modules: a module to predict the performance of JPCP as affected by early-age factors and a module to predict the early-age behavior and early life of continuously reinforced concrete pavement (CRCP). This volume provides a comprehensive set of guidelines useful in designing and constructing both JPCP and CRCP concrete pavements. This is the second volume in a series of three volumes.
TFHRC Technical Reference Center and www.fhwa.dot.gov/publications/research/infrastructure/pavements/pccp/04122/index.cfm
Quantification of Smoothness Index Differences Related to LTPP Equipment Type
The LTPP program was designed as a 20-year study of pavement performance. A major data collection effort at LTPP test sections is the collection of longitudinal profile data using inertial profilers. Three types of inertial profilers have been used since the inception of the LTPP program.
TFHRC Technical Reference Center