Release Notes for LTPPBind 3.0/3.1
Version 3.1 of the LTPPBind program is now available. Please visit the website http://ltpp-products.com/OtherProducts.asp for information on the new version.
A number of changes were made to LTPPBind 2.1 for this new version. Facts regarding LTPPBind 3.0/3.1:
- High-temperature binder selection based on a damage concept is introduced.
- A procedure was introduced to determine PG binders based on rutting damage.
- A transfer function was developed to estimate damage based PG using daily climatic factors.
- An enhanced high-temperature transfer function for pavement temperatures was developed through a comprehensive application of the Integrated Climatic Model (ICM). This model was developed using hourly climatic data, providing a more accurate representation of the high-temperature conditions in the pavement.
- A performance-based procedure utilizing current empirical models for HMA stiffness and rut predictions was developed.
- A damage factor of 1.0 indicating the binder, which should be selected for the current temperature regime. This procedure accounts for extended hot periods in certain climates, which could not be considered in the original selection procedure.
- Models were developed to extend the PG damage concept from the limited number of stations with hourly temperature data to the entire database using daily temperature data.
- A Degree-Days concept was developed to relate the number of days the pavement temperature is over 10 C to the PG damage calculation.
- Comparisons between the original SHRP PG grades and the PG damage based grades were made.
- Also added was the ability to select the acceptable threshold rut level.
- A rational grade bumping procedure was developed based on models for increased traffic and variable traffic speeds.
- The models used for performance were not developed as part of this work but the ones developed in the new M&E design guide.
If you have any questions or need more information, contact Antonio Nieves Torres, 202-493-3074, antonio.nieves@fhwa.dot.gov.
