Pavement Health Track Graphical User Interface, User's Guide
Technical Information
The PHT analysis engine quantifies the Remaining Service Life (RSL) of the pavement for each highway section using the simplified Mechanistic Empirical Pavement Design Guide (MEPDG) based pavement performance prediction models. The PHT analysis engine receives highway data and parameter metrics and determines the pavement RSL in accordance with its implementation process presented in Figure 33.
Figure 33. RSL Forecasting Process
PHT Data Schema
The PHT source data derived from HPMS 2010 are listed in Table 6.
| n_ID | integer | Unique record identifier. |
| n_Year_Record | integer | Year of record. |
| n_State_Code | integer | State FIPS code. |
| n_County_Code | integer | County FIPS code. |
| s_Sample_ID | text | Unique sample identifier. |
| s_Route_ID | text | Route identifier. |
| f_Begin_Point | single | Beginning milepost. |
| f_End_Point | single | Ending milepost. |
| f_Section_Length | single | Overall section length. |
| n_Volume_Group | integer | The AADT volume group for the facility. |
| n_Expansion_Factor | single | Factor to expand sample data to represent the universe data. |
| n_FSystem | integer | The FHWA approved functional system classification. |
| n_RU_Code | integer | Rural/Urban code |
| n_Facility_Type | integer | Operational characteristics of the roadway. |
| n_Is_Structure | integer | Section is completely on a structure, tunnel, or causeway. |
| n_Through_Lanes | integer | Number of lanes of the entire facility. |
| n_AADT | integer | Annual average daily traffic. |
| n_AADT_Single_Unit | integer | AADT for single unit trucks. |
| n_AADT_Combination | integer | AADT for combination trucks. |
| n_Future_AADT | integer | Forecasted AADT. |
| n_Future_AADT_Year | integer | Year of forecasted AADT. |
| f_Lane_Width | single | Measure of existing lane width. |
| n_Shoulder_Type | integer | Type of existing shoulder. |
| n_Speed_Limit | integer | Posted speed limit. |
| n_Climate_Zone | integer | Climate zone for the facility. |
| n_Surface_Type | integer | Surface type of the facility. |
| n_Year_Last_Improved | integer | Year in which the roadway surface was last improved. |
| n_Year_Last_Construction | integer | Year the facility was last improved. |
| f_Last_Overlay_Thickness | single | Thickness of the most recent pavement overlay. |
| f_Thickness_Rigid | single | Thickness of the rigid pavement. |
| f_Thickness_Flexible | single | Thickness of the flexible pavement. |
| n_Base_Type | integer | The base pavement type. |
| f_Base_Thickness | single | Thickness of the base pavement. |
| n_Soil_Type | integer | Soil class type. |
| f_IRI | single | International roughness index. |
| f_Cracking_Fatigue | single | Estimate of total area or slabs with fatigue cracking. |
| f_Cracking_Transverse | single | Estimate of total feet/mile of transverse cracking. |
| f_Rutting | single | Estimate of average rutting. |
| f_Faulting | single | Estimate of average vertical displacement between adjacent slabs. |
| f_PSR | single | Present serviceability rating. |
Data Aggregations
The PHT tool classifies pavement types as Rigid, Flexible, and Composite. The aggregation of the standard HPMS 2010 surface types into these three classifications is shown in Table 7.
| Classification | RSL Analysis | HPMS Code | Description |
|---|---|---|---|
| none | No | 0 | Not Reported |
| none | No | 1 | Unpaved |
| Flexible | Yes | 2 | Bituminous |
| Rigid | Yes | 3 | JPCP - Jointed Plain Concrete Pavement |
| Rigid | No | 4 | JRCP - Jointed Reinforced Concrete Pavement |
| Rigid | No | 5 | CRCP - Continuously Reinforced Concrete Pavement |
| Flexible | Yes | 6 | Asphalt-Concrete (AC) Overlay over Existing AC Pavement |
| Composite | Yes | 7 | AC Overlay over Existing Jointed Concrete Pavement |
| Composite | No | 8 | AC (Bi Overlay over Existing CRCP) |
| Rigid | No | 9 | Unbounded Jointed Concrete Overlay on PCC Pavements |
| Rigid | No | 10 | Unbounded CRCP Overlay on PCC Pavements |
| Rigid | No | 11 | Bonded PCC Overlays on PCC Pavements |
| none | No | 12 | Other |
The PHT tool aggregates the standard HPMS 2010 functional classifications for highway sections into three categories of Interstate, Primary, and Secondary roadways as shown in Table 8.
| Classification | HPMS Code | Description |
|---|---|---|
| Interstate | 1 | Interstate |
| Interstate | 2 | Principal Arterial - Other Freeways and Expressways |
| Interstate | 3 | Principal Arterial - Other |
| Primary | 4 | Minor Arterial |
| Primary | 5 | Major Collector |
| Secondary | 6 | Minor Collector |
| Secondary | 7 | Local |
Parameter Metrics
The following tables describe the default values for the parameter metrics used by the PHT analysis tool including the terminal thresholds, maximum service life, and default pavement estimates. You may modify any of these values as needed.
| Surface Type | Functional System | IRI | Cracking Fatigue |
Cracking Transverse |
Cracking Reflection |
Rutting | Faulting |
|---|---|---|---|---|---|---|---|
| Rigid | Interstate | 170 | 10 % | 0.15 in. | |||
| Rigid | Primary | 220 | 15 % | 0.20 in. | |||
| Rigid | Secondary | 220 | 20 % | 0.20 in. | |||
| Flexible | Interstate | 170 | 20 % | 640 ft/mi | 0.40 in. | ||
| Flexible | Primary | 220 | 45 % | 800 ft/mi | 0.60 in. | ||
| Flexible | Secondary | 220 | 45 % | 1270 ft/mi | 0.80 in. | ||
| Composite | Interstate | 170 | 100 ft/mi | ||||
| Composite | Primary | 220 | 60 ft/mi | ||||
| Composite | Secondary | 220 | 60 ft/mi |
| Treatment Type | Years |
|---|---|
| New HMA | 20 |
| New PCC | 30 |
| Thick AC Overlay of AC Pavement | 10 |
| Thin AC Overlay of AC Pavement | 6 |
| Thick AC Overlay of PCC Pavement | 10 |
| Unbonded PCC Overlay of PCC Pavement | 25 |
| Bonded PCC Overlay of PXX Pavement | 15 |
| Thin AC Overlay of AC/PCC Pavement | 6 |
| Pavement Estimate Category | State System On |
State System Off |
|---|---|---|
| Last overlay Thickness | 3 in. | 3 in. |
| Rigid Pavement Thickness | 10 in. | 10 in. |
| Flexible Pavement Thickness | 8 in. | 8 in. |
| Base Type | Granular | Granular |
| Base Thickness | 4 in. | 4 in. |
| Binder Type | AC-40 to AC-49 | AC-40 to AC-49 |
| Dowel Bar | Typically used | Typically used |
| Joint Space | 20 feet | 20 feet |
HPMS 2010 File Format
The following table describes the data fields for the Comma Separated Variable (CSV) file for the HPMS2010 formatted data that is used by the PHT analysis tool. This format is taken from the HPMS reassessment 2010 Data Specifications document, September 2008, paragraph 3.2.2.2, with three additional data fields (highlighted in bold) inserted as needed by the PHT analysis tool. Data fields shown in gray are not used in the analysis.
| Year_Record State_Code County_Code (field inserted by PHT analysis tool) Sample_ID (field inserted by PHT analysis tool) Route_ID Begin_Point End_Point Section_Length F_System Rural_Urban_Code (field inserted by PHT analysis tool) Urban_Code (field not used in the analysis) Facility_Type Is_Structure Access_Control (field not used in the analysis) Ownership (field not used in the analysis) Through_Lanes HOV_Type (field not used in the analysis) HOV_Lanes (field not used in the analysis) Peak_Lanes (field not used in the analysis) Counter_Peak_Lanes (field not used in the analysis) Turn_Lanes_R (field not used in the analysis) Turn_Lanes_L (field not used in the analysis) Speed_Limit Toll (field not used in the analysis) Toll_Type (field not used in the analysis) Route_Number (field not used in the analysis) Route_Signing (field not used in the analysis) Route_Qualifier (field not used in the analysis) AADT AADT_Single Pct_Peak_Single (field not used in the analysis) AADT_Combination |
Pct_Peak_Combination (field not used in the analysis) K_Factor (field not used in the analysis) Dir_Factor (field not used in the analysis) Future_AADT Future_AADT_Year Type_Signal (field not used in the analysis) Pct_Green_Time (field not used in the analysis) Number_Signals (field not used in the analysis) Stop_Signs (field not used in the analysis) At_Grade_Other (field not used in the analysis) Lane_Width Median_Type (field not used in the analysis) Median_Width (field not used in the analysis) Shoulder_Type Shoulder_Width_R (field not used in the analysis) Shoulder_Width_L (field not used in the analysis) Peak_Parking (field not used in the analysis) Widening_Obstacle (field not used in the analysis) Widening_Potential (field not used in the analysis) Curves_A (field not used in the analysis) Curves_B (field not used in the analysis) Curves_C (field not used in the analysis) Curves_D (field not used in the analysis) Curves_E (field not used in the analysis) Curves_F (field not used in the analysis) Terrain_Type (field not used in the analysis) Grades_A (field not used in the analysis) Grades_B (field not used in the analysis) Grades_C (field not used in the analysis) Grades_D (field not used in the analysis) Grades_E (field not used in the analysis) Grades_F (field not used in the analysis) |
Pct_Pass_Sight (field not used in the analysis) IRI PSR Surface_Type Rutting Faulting Cracking_Fatigue Cracking_Transverse Year_Last_Improv Year_Last_Construction Last_Overlay_Thickness Thickness_Rigid Thickness_Flexible Base_Type Base_Thickness Climate_Zone Soil_Type NHS Future_Facility (field not used in the analysis) STRAHNET (field not used in the analysis) Truck_Net (field not used in the analysis) VSF (field not used in the analysis) Capacity (field not used in the analysis) Design_Speed (field not used in the analysis) Vertical_Alignment(field not used in the analysis) Horizontal_Alignment(field not used in the analysis) Volume_Group Expansion_Factor |
Updated: 10/31/2012