Products derived from the Long-Term Pavement Performance (LTPP) program have been made available to State departments of transportation and other segments of the highway community since the early years of the program. Initially, these were methods, guidelines, and procedures for standardized testing and performance data collection. While these procedures were developed to meet LTPP data-collection needs, their conversion into standard practices has been an American Association of State Highway and Transportation Officials (AASHTO) activity. Some products and benefits from LTPP already in use are based on best-practice construction specifications developed for the pavement experiments requiring new construction, while other products were developed from early analysis of LTPP data.
Throughout the life of the LTPP program, significant efforts have been made to improve data accessibility for all potential users. At least once a year for more than a decade, standard data releases containing data from the LTPP database have been made available on DVDs, USB drives, and more recently, the Internet.
( https://infopave.fhwa.dot.gov )
LTPP's products and software available on InfoPave include:
- LTPP InfoPave™
Launched in 2014, LTPP InfoPave™ enables users to easily tap into the wealth of pavement performance data, products, and knowledge available by the LTPP program. The Web-based system offers a gateway to data from the LTPP test sections, as well as findings from data analyses and extensive documentation for the many aspects of LTPP experiment design, data acquisition, quality control, and data dissemination. The new site for LTPP InfoPave™ is https://infopave.fhwa.dot.gov. Visitors will also find information on LTPP InfoPave™ Mobile, a companion application for smart phones.
- Climate Tool
LTPP Climate Tool can be found on the LTPP InfoPave TOOLS hub. It utilizes multiple data presentation options including climatic maps and graphs Modern-Era Retrospective Analysis for Research and Applications (MERRA) climatic data, developed by the National Aeronautics and Space Administration , is used to present a climatic map. The map features data on temperature, precipitation, humidity, solar, and wind.
LTPPBind Online is a web-based tool to help highway agencies select the most suitable Performance Grade (PG) binder for a particular site based on the AASHTO M320-10 and AASHTO M332-14 standards. Algorithms for high and low temperature are the same as LTPPBind 3.0/3.1 according to AASHTO M323-13. LTPPBind Online allows use of MERRA climatic data, LTPP climatic data, or user data for asphalt binder grade calculations.
- Rigid Pavement Design Software
A Microsoft Excel spreadsheet that automates the design and analysis procedures for improved guidelines for cement concrete pavements as published in the 1998 Supplement to the AASHTO Guide for the Design of Pavement Structures, Part II - Rigid Pavement Design & Rigid Pavement Joint Design.
Other LTPP products are available at the links below:
- Distress Identification Manual for the Long-Term Pavement Performance Program (Fifth Revised Edition)
Manual developed to provide a consistent, uniform basis for collecting distress data on the LTPP program. The manual provides a common language for describing cracks, potholes, rutting spalling, and other pavement distresses.
- FWD Calibration
New information and video that present the LTPP falling weight deflectometer (FWD) calibration procedure.
- Pavement Manuals of Practice
A series of four manuals that provide the latest information on pavement maintenance and repair.
- Resilient Modulus
Research report and videotapes that explain the details of LTPP's revised unbound resilient modulus laboratory tests and procedures.
The following documents provide additional information on LTPP products: