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PaveDAT Pavement Damage Assessment Tool Roger Mingo, P.E. R.D. Mingo and Associates.

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Presentation on theme: "PaveDAT Pavement Damage Assessment Tool Roger Mingo, P.E. R.D. Mingo and Associates."— Presentation transcript:

1 PaveDAT Pavement Damage Assessment Tool Roger Mingo, P.E. R.D. Mingo and Associates

2 Origin FHWA Need: Easy-to-Use Pavement Damage Assessment Tool Needed Alternative to ESALs Joint Research Project of FHWA’s Offices of Policy and Freight Management and Operations PaveDAT: Simplified Version of NAPCOM (National Pavement Cost Model)

3 Approach Used ME-PDG (Mechanistic-Empirical Pavement Design Guide) ARA Designed MEPDG, Auburn University Helped with Application Applied Model Thousands of Times to Derive New Pavement Damage Equivalence Factors

4 Load Equivalence Factors (LEFs) ESALs (Equivalent Single Axle Loads)– One Type of LEF ESALs Based on 50-Year-Old Study in Single Location ESALs Widely Seen as Outdated and Based on Many Assumptions New LEFs Developed for PaveDAT and NAPCOM Independent of ESALs

5 Overview of PaveDAT Model estimates pavement costs for specific vehicles and types of trips Model can use national average data, state default data, or user-supplied data After state customization, as needed, model is simple to use User supplies vehicle axle weights and trip information

6 User Inputs Axle weight for each axle group (tandems and tridems are each considered one axle group) Number of axles in each group Miles of travel on Interstate, State, and Local roads

7 Results Cents per mile of travel Total costs in dollars Costs shown by highway system as well as for total trip

8 Special Permit Pavement Cost Estimator Using Pavement Data for:Natl. Avg. Miles of Travel by Type of Highway Interstate Highway85 State Highway12 County / Local Road3 Total100 Axle Descriptions Weight (kips)# Axles Steering Axle121 Drive Axle342 Axle Group 3513 Axle Group 4 Axle Group 8 Total976 Results: Estimated Pavement Costs Miles$ / MilePavement Cost Interstate Highway85$0.4197$35.67 State Highway12$0.7614$9.14 County / Local Road3$1.5729$4.72 Total100$0.4953$49.53

9 97,000- Lb Six-Axle Truck (3S3) Results Results: Estimated Pavement Costs Miles$ / Mile Pavement Cost Interstate Highway85$0.4197$35.67 State Highway12$0.7614$9.14 County / Local Road3$1.5729$4.72 Total100$0.4953$49.53

10 80,000-Lb Five-Axle Truck (3S2) User Inputs Miles of Travel by Type of Highway Interstate Highway85 State Highway12 County / Local Road3 Total100 Axle Descriptions Weight (kips)# Axles Steering Axle121 Drive Axle342 Axle Group 3342 Axle Group 4 Axle Group 8 Total805

11 80,000-Lb Five-Axle Truck (3S2) Results Results: Estimated Pavement Costs Miles$ / Mile Pavement Cost Interstate Highway85$0.3498$29.73 State Highway12$0.5703$6.84 County / Local Road3$1.1017$3.31 Total100$0.3988$39.88

12 71,000-Lb Five-Axle Truck (3S2) User Inputs Miles of Travel by Type of Highway Interstate Highway85 State Highway12 County / Local Road3 Total100 Axle Descriptions Weight (kips)# Axles Steering Axle111 Drive Axle302 Axle Group 3302 Axle Group 4 Axle Group 8 Total715

13 71,000-Lb Five-Axle Truck (3S2) Results Results: Estimated Pavement Costs Miles$ / Mile Pavement Cost Interstate Highway85$0.2153$18.30 State Highway12$0.3668$4.40 County / Local Road3$0.7294$2.19 Total100$0.2489$24.89

14 Pavement Cost Comparison Example VehicleCost per Mile 97,000-Pound 6-Axle ,000-Pound 5-Axle ,000-Pound 5-Axle24.89

15 Pavement Cost Comparison Example VehicleCost per Mile 97,000-Pound 6-Axle ,000-Pound 5-Axle39.88 Difference9.65

16 Pavement Cost Comparison Example VehicleCost per Mile 97,000-Pound 6-Axle ,000-Pound 5-Axle24.89 Difference24.64

17 Pavement Cost Comparison Example VehicleCost per Mile 97,000-Pound 6-Axle49.53 User Fees Paid per Mile9.27 Difference40.26

18 Specifying A Base Vehicle Base Vehicle Axle Descriptions Weight (kips)# Axles Steering Axle111 Drive Axle302 Axle Group 3302 Axle Group 4 Axle Group 5 Axle Group 6 Axle Group 7 Axle Group 8 Total715

19 97,000- Lb 3S3 Compared to 71,000 Base Results: Estimated Pavement Costs Miles$ / Mile Pavement Cost Interstate Highway85$0.2044$17.37 State Highway12$0.3946$4.73 County / Local Road3$0.8435$2.53 Total100$0.2464$24.64

20 88,000- Lb 3S2 Compared to 71,000 Base Results: Estimated Pavement Costs Miles$ / Mile Pavement Cost Interstate Highway85$0.3494$29.70 State Highway12$0.5017$6.02 County / Local Road3$0.8759$2.63 Total100$0.3835$38.35

21 80,000- Lb 3S2 Compared to 71,000 Base Results: Estimated Pavement Costs Miles$ / Mile Pavement Cost Interstate Highway85$0.1344$11.43 State Highway12$0.2035$2.44 County / Local Road3$0.3723$1.12 Total100$0.1499$14.99

22 Overview of Underlying Elements Load Equivalence Factors (LEFs) based on thousands of runs of latest pavement models Weight data for vehicle fleet comes from millions of WIM observations Costs per mile based on national current pavement expenditures per truck mile Load-related share of pavement costs based on recent state cost-allocation studies

23 Load Equivalence Factor Example Distress Levels at 18,000 and 20,000 Trucks per Day ADTTLong CrkAllig CrkAC RutTotal RutIRI 18, , Distress Levels with 18,000 ADTT and Added 34-Kip Tandem Axles AxlesLong CrkAllig CrkAC RutTotal RutIRI

24 Estimating Target Number of Axles

25 Load Equivalence Factor Example (Continued) Daily Axles to Reach Target Distress Levels WeightTypeLong CrkAllig CrkAC RutTotal RutIRI 8Single Single Single Tandem Tandem Tandem Tandem Tridem Tridem Tridem

26 Overview of Underlying Elements Load Equivalence Factors (LEFs) based on thousands of runs of latest pavement models Weight data for vehicle fleet comes from millions of WIM observations Costs per mile based on national current pavement expenditures per truck mile Load-related share of pavement costs based on recent state cost-allocation studies

27 Overview of Underlying Elements Load Equivalence Factors (LEFs) based on thousands of runs of latest pavement models Weight data for vehicle fleet comes from millions of WIM observations Costs per mile based on national current pavement expenditures per truck mile Load-related share of pavement costs based on recent state cost-allocation studies

28 Options to Customize States can use their pavement knowledge to modify pavement distress distributions States can enter their own detailed pavement cost information States can update WIM data States can combine and weight the default data from adjacent states

29 Current Status PaveDAT Was Completed in 2011 Presentations Made to 5 Pilot States Application So Far Has Been for Special Studies Applied in Some Form in Oregon, DC, and Wisconsin Texas is Adapting Model for Its Use


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