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Publication Number:      Date:  Jan/Feb 2001
Issue No: Vol. 64 No. 4
Date: Jan/Feb 2001


Recent Publications

Compiled by Zac Ellis of FHWA's Office of Research and Technology Services

Below are brief descriptions of reports recently published by the Federal Highway Administration's (FHWA) Office of Research, Development, and Technology. All of the publications are available from the National Technical Information Service (NTIS). In some cases, limited copies of the publication are available from the Research and Technology (R&T) Report Center.

When ordering from NTIS, include the NTIS PB number (or publication number) and the publication title. You may also visit the NTIS Web site at www.ntis.gov to order publications online. Call NTIS for current prices. For customers outside the United States, Canada, and Mexico, the cost is usually double the listed price. Address requests to:

National Technical Information Service

5285 Port Royal Road

Springfield, VA 22161

Telephone: (703) 605-6000

Toll-free number: 1-800-553-NTIS (6847)

Expanded Sales Desk Hours: 8 a.m. to 8 p.m. EST, Mon.-Fri.

Requests for items available from the R&T Report Center should be addressed to:

R&T Report Center, HRTS-03

Federal Highway Administration

9701 Philadelphia Court, Unit Q

Lanham, MD 20706

Telephone: (301) 577-0906

Fax: (301) 577-1421

For more information on research and technology publications coming from FHWA, visit the Turner-Fairbank Highway Research Center's (TFHRC) Web site at www.tfhrc.gov, FHWA's Web site at www.fhwa.dot.gov, or the OneDOT information network at http://dotlibrary.dot.gov/.

Magnetic-Based NDE of Prestressed and Post-Tensioned Concrete Members The MFL System Publication No. FHWA-RD-00-026

This report describes all aspects of a study to develop a nondestructive evaluation (NDE) system based on the concept of magnetic flux leakage (MFL) to detect corrosion and fracture of prestressing steel in pretensioned and post-tensioned concrete bridge members. The basic methodology is based on introducing a direct-current magnetic field in close proximity of the prestressing or post-tensioning steel and monitoring the variations of the field due to loss of cross-sectional area of steel from corrosion or fracture.

The NTIS publication number is PB2000-105941.

Development and Field Testing of Multiple Deployment Model Pile (MDMP)

Publication No. FHWA-RD-99-194

A model pile is a calibrated tool equipped with instrumentation capable of monitoring the pile/soil interaction over the pile history. Monitoring includes the installation, pore pressure dissipation combined with consolidation and soil pressure equalization, and, ultimately, the pile behavior under loading and failure. The model pile installation and soil structure interaction simulate the actual field conditions of full-scale piles. As such, the obtained information can be used directly (e.g., skin friction) or extrapolated (e.g., pore pressure dissipation time) to predict the soil's response during full-scale installation.

The Multiple Deployment Model Pile (MDMP) was developed as an in situ tool for site investigations. The MDMP instrumentation is capable of monitoring the pile/soil interaction throughout the life cycle of a driven pile. Appendices to this report are on file at the Turner-Fairbank Highway Research Center, McLean, Va.

The NTIS publication number is PB2000-107845.

User's Primer for BRI-STARS (Bridge Stream Tube model for Alluvial River Simulation)

Publication No. FHWA-RD-99-191

The BRI-STARS (Bridge Stream Tube Model for Alluvial River Simulation) model is a generalized semi-two-dimensional water and sediment routing model with an integrated graphical interface for solving complicated river engineering problems with limited data and resources. The model is capable of computing alluvial scour/deposition through subcritical, supercritical, and a combination of both flow conditions involving hydraulic jumps. Unlike conventional water and sediment routing models, it is also capable of simulating channel widening/narrowing phenomena, as well as local scour caused by highway encroachments. It contains a subset of FHWA's Water Surface Profile (WSPRO) computation method subroutines for computing bridge hydraulics.

This user's primer provides a brief description of the BRI-STARS model, installation and operations guidelines, the use of various utility programs within the package, and an example application of the model. Detailed instructions for the use of the utility programs included in the BRI-STARS package, including their menu structures and their operations, are given.

The NTIS publication number is PB2000-107371.

User's Manual for BRI-STARS (Bridge Stream Tube Model for Alluvial River Simulation)

Publication No. FHWA-RD-99-190

This user's manual provides a theoretical background on the methodologies used by the model as well as the formulations of governing flow and sediment routing procedures. Various records needed for the operation of the model, their description, format, and sequential positioning within the data structure are given. Example applications, as well as practical guidelines for the use of the model, are presented.

The NTIS publication number is PB2000-107372.

Temperature Predictions and Adjustment Factors for Asphalt Pavement

Publication No. FHWA-RD-98-085

This report presents the results of an analysis of the deflections and backcalculated asphalt moduli response to the pavement temperature. The study used deflection and temperature data from 40 sites monitored in the Seasonal Monitoring Program of the Long Term Pavement Performance (LTPP) program.

The report presents improved methods of estimating the temperature within an asphalt pavement based on the measurement procedures used for the LTPP program. The data necessary to estimate the temperature within the asphalt included the surface temperature, time of day, depth below the surface, and the average air temperature from the previous day. Backcalculation of the asphalt modulus from the deflection data of the 40 sites was related to pavement temperature, and a method of estimating what the modulus of the asphalt would be at different temperatures is presented. Deflection and deflection basin shape factor response to temperature was also evaluated, resulting in relationships for each of the items evaluated with pavement temperature.



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