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Find Sections (a.k.a Section Filters) provides filter criteria to narrow down the selection of LTPP test sections. Users can apply filters from multiple classifications at the their discretion. Selected Section Count is updated in real-time as the user applies filters. Users can also save filters for future use or export them to share filter criteria with others.

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General
Structure
Climate
Traffic
Performance

MEPDG Inputs

The MEPDG Inputs feature is designed to provide the performance data and inputs from the LTPP database for the AASHTOWare Pavement ME software. This will allow the user to run comparisons of model predictions against the actual performance data from LTPP test sections. In addition, users can implement the actual performance data from corresponding LTPP sections in order to calibrate AASHTOWare distress models to the local conditions. The initial step in the design of this feature is to show a proof of concept for LTPP GPS-3 and SPS-2 JPCP sections.

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MEPDG Inputs (for AASHTOWare Pavement ME) for Section:

Input

Value

Table

Field

Help Notes

Traffic

Initial AADTT		TRF_HIST_EST_ESAL	AADT_TRUCK_COMBO (for YEAR_HIST_EST=Min)	Since table TRF_MON_EST_ESAL and TRF_HIST_EST_ESAL contains information on the number of trucks in the truck lane, no adjustments for a two-way traffic and lane distribution is required. Therefore, the appropriate adjustment factors are set to 1, or 100%. The initial AADTT and the growth rates are obtained by matching the available AADTT data with the compound growth model.
		TRF_HIST_EST_ESAL	AADT_TRUCK_COMBO (for YEAR_HIST_EST=Max)
		TRF_MON_EST_ESAL	AADT_TRUCK_COMBO (for YEAR_MON_EST=Min)
		TRF_MON_EST_ESAL	AADT_TRUCK_COMBO (for YEAR_MON_EST=Max)
Number of lanes in design direction	1	See Notes
Percent of trucks in design direction (%)	1	See Notes
Percent of trucks in design lane (%)	1	See Notes
Traffic growth factor	See Notes	See Notes
Operational speed (mph)	See Notes			Use AASHTOWare Pavement ME default
Vehicle Class and Axle distribution	View	TRF_MEPDG_* (7 tables)	All fields	Use AASHTOWare Pavement ME default

Climate

Latitude (degrees.minutes)	SECTION_COORDINATES	LATITUDE	The virtual weather station can be obtained for the LTPP section location by interpolation from the nearby weather stations. For future versions, the climatic data may be extracted from other sources like MERRA.
Longitude (degrees.minutes)	SECTION_COORDINATES	LONGITUDE
Elevation (ft)	INV_ID, SPS_ID	ELEVATION
Depth of water table (ft)	SMP_WATERTAB_DEPTH_MAN	WATERTAB_DEPTH	Water table depth collected as a part of Seasonal Monitoring Program (SMP) is provided for those LTPP sections. The depth of water table is assigned based on experience and better guidelines is required for this input.

Structure (Design Features)

Joint spacing (ft)		INV_PCC_JOINT or SPS2_PCC_JOINT_DATA	AVG_CONTRACTION_ SPACING	The Inventory table contains information provided during the nomination process or when section is included in the LTPP program. The average joint spacing computed using the PONIT_LOC field in the MON_DIS_JPCC_FAULT table is provided for verification purpose.
Joint spacing (ft)		MON_DIS_JPCC_FAULT	POINT_LOC and CRACK_OR_JOINT
Sealant type		INV_PCC_JOINT or SPS2_PCC_JOINT_DATA	TRANSVERSE_SEAL_TYPE	The sealant type and determination of whether a joint was sealed was captured in the inventory tables at the time the section was nominated or included in the LTPP program. However, some sections where maintenance was performed, MNT_PCC_JOINT_RESEAL table in the JOINT_SEAL_TYPE table information is also provided.
Sealant type		MNT_PCC_JOINT_RESEAL	JOINT_SEAL_TYPE
Dowel diameter (in)		INV_PCC_JOINT or SPS2_PCC_JOINT_DATA	ROUND_DOWEL_DIAMETER
Edge support		INV_SHOULDER or SPS_GENERAL	SH_SURFACE_TYPE, SH_SURFACE_TYPE_ OTHER, I_SH_SURFACE_TYPE, I_SH_SURFACE_TYPE_ OTHER, O_SH_SURFACE_TYPE, O_SH_SURFACE_TYPE_ OTHER	No edge support option for AC shoulder type
Base type		TST_L05B	LAYER_TYPE (below LAYER_TYPE=PC)	LAYER_TYPE =GB (Granular Base), LAYER_TYPE =GS (Granular Subbase), LAYER_TYPE =TB (Treated (Bound) Base), LAYER_TYPE =TS (Treated (Bound) Subbase)
Loss of full friction (age in months)	See Notes			Use AASHTOWare Pavement ME default
Surface shortwave absorptivity	See Notes			Use AASHTOWare Pavement ME default

Measured Performance (IRI, Transverse Cracking, Faulting)

Measured IRI
(m/Km)

Profile Date

IRI Average

Measured Transverse Cracks
(Count)

Survey Date

Total Number of Cracks (Sum of TRANS_CRACK_NO_H +
TRANS_CRACK_NO_M +
TRANS_CRACK_NO_L)

Measured Faulting
(mm)

Survey Date

Avg Wheelpath Fault

: Tools

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