The Federal Highway Administration (FHWA) Pavement Health Track (PHT) Analysis Tool is a computer-assisted decision-making tool designed to help state highway agencies (SHA), metropolitan planning organizations (MPO), cities, and counties characterize current and future pavement network health and manage pavement deficiencies through maintenance and rehabilitation planning in a timely, cost-effective manner.
The benefits of using PHT Analysis Tool include the following:
The PHT Analysis tool is a software application designed for use with the Microsoft Windows® operating system.
Uninstall the PHT Analysis tool software from the Windows Control Panel.
Information on all support services can be obtained from: http://www.fhwa.dot.gov/pavement/healthtrack
The default source data for the PHT Analysis Tool is based on the HPMS 2010 format comma-delimited text file shown in Table 20 or other state maintained Pavement Management System (PMS) electronic source data. The PHT tool acquires data from the external data sources and compiles a set of highway data made up of the data fields required for the PHT analysis. Each record in the highway data represents a highway section. The compiled highway data are permanently stored in the database for subsequent use in the PHT analysis.
The general procedure for characterizing a pavement networks health using the PHT Analysis Tool is comprised of the following steps:
Pavement RSL at the project level typically is defined as life of a pavement from the present time until application of the first significant rehabilitation treatment or reconstruction, which would be the first significant cost expenditure for the pavement after its original construction. The placement of a structural overlay or reconstruction signals the end of a pavement's serviceable life; the application of minor maintenance treatments or thin overlays is not considered significant enough to indicate the end of pavements service life.
Significant rehabilitation occurs due to some form of pavement failure. Failure typically is described as the pavement attaining first terminal distress as shown in Figure 1. Thus, RSL is simply the time in years or remaining equivalent single axle loads (ESALs) that it would take a given pavement to attain the first terminal distress.
The critical RSL is the estimated time until the first terminal distress occurs. Using the example illustrated in Figure 1 for jointed plain concrete pavement (JPCP), the critical RSL is estimated as shown in Table 1. In this example, the first terminal distress is cracking, which occurs at 15 years. Since the pavement's current age is 10 years, the RSL is the difference of 5 years.
|JPCP Distress/IRI||Predicted Life, yrs||Current Pavement Age, yrs||RSL, yrs||Critical RSL|
The weighted average RSL is the estimated time until each terminal distress occurs averaged together using a user-defined weight for each distress type. Using the example illustrated in Figure 1, the weighted average RSL is estimated as shown in Table 2. In this example, each distress type is assigned an equal weight in the average calculation, resulting in an average RSL of 10.5 years.
|JPCP Distress/IRI||Predicted Life, yrs||Current Pavement Age, yrs||RSL, yrs||Weight||Average RSL|