Asset Management

Pavement Health Track Remaining Service Life (RSL) Forecasting Models, Technical Information

Guidance on Setting up the Input Database

Data Sources for Running the New Pavement Equations

Data for running the PHT Tool will be obtained from two primary sources: (a) the HPMS program and (b) default data tables (developed mostly using Long Term Pavement Performance, or LTPP data and MEPDG default data tables). Descriptions of all sources of data for running the new pavement equations in HERS are presented in the following sections.

Data from the HPMS Program

The 2010+ version of the HPMS program would be the primary source of data for running the new equations in HERS. The majority of the individual data items required will be from the HPMS Programs Sections and Estimates data tables. A detailed description of the HPMS 2010+ Program is presented in the HPMS Reassessment 2010+ Final Report (FHWA 2008). A listing and detailed description of the data items of interest for running the new pavement equations is presented in Table 31 along with a description of the data.

Non-HPMS Data Requirements

Data items (state or material type defaults) not provided by the HPMS program but required by the new pavement equations are provided as default data tables. Information in these default tables was obtained primarily from the LTPP database and MEPDG. Default data items provided included:

• HMA
  • Gradation
  • A & VTS (MEPDG asphalt binder prediction model coefficients)
• PCC (materials and design)
  • Compressive strength
  • Elastic modulus
  • Dowel diameter
  • PCC/base interface zero friction age
• Climate
  • Precipitation
  • Freezing index
  • Air freeze-thaw cycles
  • Monthly mean air temperature
• Subgrade
  • Gradation
  • Resilient modulus (AASHTO 1997, LTPP 2009).

The default data items are presented in Table 34 through Table 43. The Traffic default inputs along with HPMS traffic data were used to compute ESALs (the traffic input for most of the new equations).

Table 34. HPMS Data Items Required for Pavement Equations

Reference Number	Data Item (from HPMS Sections, Reference, and Summaries Catalog)	Description
3.2.1.1.3	Route_ID	Up to 32 alpha-numeric digits that identify the route
3.2.2.1.1	Year_Record	The calendar year for which the data apply
3.2.2.1.2	State_Code	The State FIPS code
3.4.1.1.3	County_Code	Census defined County FIPS codes
3.2.2.1.6	Sample_ID	A unique Identifier for the Sample
3.2.2.1.4	Begin_Point	Beginning of a section. The Route_ID, Begin_Point, and End_Point utilize the Linear Reference Method (LRM) that is native to the State DOT
3.2.2.1.5	End_Point	End of a section. The Route_ID, Begin_Point, and End_Point utilize the Linear Reference Method (LRM) that is native to the State DOT
3.3.1.1.7	Section_Length	The true length of the section that is used to determine the certified mileage
	Volume_Group
3.2.1.2.1	F_System	Interstate Principal Arterial - Other Freeways and Expressways Principal Arterial - Other Minor Arterial Major Collector Minor Collector Local
3.2.1.2.2	Urban_Code	99999 Rural 99998 Small urban area (population < 50000) Others Urban
3.2.1.2.3	Facility_Type	One-Way Roadway Two-Way Roadway Couplet Ramp Non-Mainline
3.2.1.2.7	Through_Lanes	Code the number of through lanes according to the striping, if present, on multilane facilities, or according to traffic use or State/local design guidelines if no striping or only centerline striping is present. Enter the prevailing number of through lanes in both directions carrying through traffic in the off-peak period. Exclude what are defined as auxiliary lanes, such as collector-distributor lanes, weaving lanes, frontage road lanes, parking and turning lanes, acceleration/deceleration lanes, toll collection lanes and truck climbing lanes
3.2.1.2.21	AADT	AADT (Count or Factored) value to represent the current data year. For two-way facilities, provide the AADT for both directions; provide the directional AADT if part of a one-way couplet or for one-way streets
3.2.1.2.22	AADT_Single	AADT for single unit trucks (classes 4-7). All single-unit truck activity over all days of the week and seasons of the year in terms of annual average daily traffic
3.2.1.2.24	AADT_Combination	AADT for Combination Trucks (classes 8-13)
3.2.1.2.28	Future_AADT	Forecasted two-way AADT
	Future_AADT_Year	Four-digit year for which FUTURE_AADT has been forecasted in. This cannot be for less than 18 years nor more than 25years from the data year
3.2.1.2.34	Lane_Width	The measure of existing lane width
3.2.1.2.37	Shoulder_Type	None Surfaced shoulder exists - bituminous concrete (AC) Surfaced shoulder exists - Portland Cement Concrete surface (PCC) Stabilized shoulder exists (stabilized gravel or other granular material with or without admixture) Combination shoulder exists (shoulder width has two or more surface types; e.g., part of the shoulder width is surfaced and a part of the width is earth) Earth shoulder exists Barrier curb exists; no shoulder in front of curb
3.2.1.2.14	Speed_Limit	Posted speed limit
3.2.1.2.61	Climate_Zone*	Climate zone as defined by the 4 LTPP climate zone descriptions Wet-Freeze Wet-Nonfreeze Dry-Freeze Dry-Nonfreeze
3.2.1.2.49	Surface_Type	Unpaved Bituminous JPCP - Jointed Plain Concrete Pavement JRCP - Jointed Reinforced Concrete Pavement CRCP - Continuously Reinforced Concrete Pavement Asphalt-Concrete (AC) Overlay over Existing AC Pavement AC Overlay over Existing Jointed Concrete Pavement AC (Bi Overlay over Existing CRCP) Unbonded Jointed Concrete Overlay on PCC Pavements Unbonded CRCP Overlay on PCC Pavements Bonded PCC Overlays on PCC Pavements Other
3.2.1.2.54	Year_Last_Improvement	The year in which the roadway surface was improved
3.2.1.2.55	Year_Last_Construction	The year the section was last improved (the year the section was constructed or reconstructed)
3.2.1.2.56	Last_Overlay_Thickness	Thickness of the most recent pavement overlay
3.2.1.2.57	Thickness_Rigid	Thickness of the rigid pavement
3.2.1.2.58	Thickness_Flexible	Thickness of the flexible pavement
3.2.1.2.59	Base_Type	No base Aggregate Asphalt or cement stabilized Asphalt or cement stabilized with granular subbase Hot mix AC (Bituminous) Lean concrete Stabilized open-graded permeable Fractured PCC
3.2.1.2.60	Base_Thickness	The thickness of the base pavement
3.2.1.2.62	Soil_Type	Soil type as defined by AASHTO soil classes Granular (35% or less passing the 0.075 mm sieve) (AASHTO Soil Class A0 through A-3) Fine (Silt-Clay) Materials (>35% passing the 0.075 mm sieve) (AASHTO Soil Class A-4 through A-7)
3.2.1.2.47	IRI	International Roughness Index
3.2.1.2.52	Fatigue_Cracking	Estimate of total area with fatigue type cracking for AC pavements and total percent of slabs with cracking for PCC pavements
3.2.1.2.53	Transverse_Cracking	Estimate of total ft/mi or m/km of transverse cracking
3.2.1.2.50	Rutting	Average Rutting
3.2.1.2.51	Faulting	The average vertical displacement between adjacent jointed concrete panels
3.2.1.2.48	PSR
3.5.1.1.6	Is_State_Owned	Off-State System On-State System
3.5.1.2.1	Last_Overlay_Thickness	Typical design or construction last overlay thickness
3.5.1.2.2	Thickness_Rigid	Typical design or construction thickness of rigid pavement
3.5.1.2.3	Thickness_Flexible	Typical design or construction thickness of Flexible Pavement
3.5.1.2.4	Base_Type	Crushed Gravel Crushed Stone Granular Asphalt Stabilized High Stabilized Weakly Stabilized Drainable Material
3.5.1.2.5	Base_Thickness	Typical design or construction thickness
3.5.1.2.6	Binder_Type	Viscosity Graded Binders Less than AC-2.5 AC-2.5 to AC-4 AC-5 to AC-9 AC-10 to AC-19 AC-20 to AC-29 AC-30 to AC-39 AC-40 to AC-49 AC-50 or more Codes for Super Pave Binders
3.5.1.2.7	Dowel_Bar	No - Dowel Bars not typically used Yes - Dowel Bars are typically used
3.5.1.2.8	Joint_Spacing	Typical joint spacing

Table 37. Default JPCP Design Information

State FIPS Code	JPCP Design Feature	Value
All
	Sealant Type	Preformed = 1, Other or None = 0 (0 is recommended)
	Tied shoulder?	Assumed tied PCC shoulder if the shoulder type is PCC. Shoulder type information is presented in Table 43 (HPMS ref # 3.2.1.2.37)
	Dowel diameter, in
	PCC/Base interface loss of friction age (debonding) (Ref # 3.2.1.2.59)
	PCC/Base interface loss of friction age (debonding) (Ref # 3.5.1.2.4)

^*Soil cement or lime treated aggregate and soils.

^**Treated and untreated permeable materials.