Presentation on theme: "Impact of Heavy Truck Traffic on Pavement Performance"— Presentation transcript:
1 Impact of Heavy Truck Traffic on Pavement Performance Valbon LatifiHani H. TitiNicholas ColeyMohammed MatarDepartment of Civil Engineering and MechanicsUniversity of Wisconsin-MilwaukeeWednesday, February 26, 2014
2Introduction Height and Weight Restrictions in Wisconsin: Width: 8’6” Overweight (OW) = 80,000 lbsOversize (OS) = Height: 13’6”Width: 8’6”Length: 45’ (Single Unit)75’ (Tractor-Trailer)Superheavy (SHL) = 270,000 lbsOnly Single Trip permit records used for analysis.
3BackgroundWisconsin (WI) issued approximately 96,000 single trip permits from June 2007 to June 2013432 permits were (SHLs)Only Oversize (OS) permits excluded from analysis (height, width, and length restrictions)
4Previous StudiesAcimovic (2007) conducted research on reconstructed OSOW corridor in Colorado, discovering rutting occurred less than a year later. Rutting occurred due to repeated and excessive loading of OSOW trucks.Chatti (2004) stated that rutting damage induced on the pavement by multiple axles increased the number of axles per group increased as well.
5Research MethodologyLocate corridors in WI with high use of OW and SHL trucks.Analyze pavement performance with AASHTOWare Pavement ME DesignBuild various Axle Load Spectra with baseline traffic and then the addition of OW permitted vehiclesUse Vehicle Class Distribution comparing statewide data to localized data.
6Permit Fees vs. GVW#2#3#1Three random single trip permits highlighted to see discrepancy in permit fee structure and policy.
8Comparison of SHL FeesTruckGVW (kips)Trip Length (mi.)FeeCost per kipCost per mile1585.6493$566$0.97$1.152605.0134$574$0.95$4.283749.021$705$0.94$33.57Single trip permit fees for SHL’s cost approximately $1.00 per kip.No correlation between distance of trip and permit fee.Should potential increase in damage imposed by SHL loads be included in permit fees with regards to distance traveled?
9Case Study (Wisconsin State Highway 140) 12 miles from IL border to I-43 and WI-1121,613 permits in 6 years103 SHL permits in 6 yearsBypasses the I-90/I-39 tollway in IllinoisField survey and 6 hour traffic count were conductedCourtesy of Google Maps
10WI-140 Typical Section 2” HMA Overlay 2” HMA 4.5” Aggregate Base CourseA-6 Soil Subgrade1.5” milled surface and 2” overlay in 1996
11WI-140 Pavement Condition July 22, 2013Severe alligator cracking, rutting, longitudinal cracking, potholes, and shoulder failure.
12WI-140 Pavement Condition Obliterated shoulderPotential shoulder failure due to wide base trucks or large farm equipment.July 22, 2013
13OW VehiclesPhotos taken in the field on July 22 and November 4, 2013.
14Farm Equipment Photos taken on November 4, 2013. 10 passed through in 6 hour traffic count.
15AASHTOWareProgram created to capture pavement design through the Mechanistic-Empirical Pavement Design Guide (MEPDG).Unlike previous AASHTO Design Guides, MEPDG is a pavement analysis tool, determining the stresses and when they are projected to occur over the design life.Three main inputs:TrafficPavement Structure/Material PropertiesClimate
16Traffic Count on WI-140 (07/22/13) Vehicle ClassTotal Count13216368452167896710111213 Total3352.5 hour count (8:45 am to 11:15 am)30.1% trucks (Class 4 to 13)66.3% of the trucks were Class 910 marked as OS and potentially OW
17Traffic Count on WI-140 (11/04/2013) Vehicle ClassSouth BoundNorth BoundTOTAL8:00 am to 10:00 am10:00 am to 12:00 pm12:00 pm to 2:00 pmSB TotalNB Total12585460172718061212384325192064242366130457962210438282674343190164111213 Total128125116369154410779
18Traffic Count on WI-140 (11/04/2013) Vehicle ClassTotal Count123843130452564378916410111213 Total7796 hour count (8:00 am to 2:00 pm)33.9% trucks (Class 4 to 13)62.1% of the trucks were Class 915 marked as OS and potentially OW
19WisDOT’s Vehicle Class Distribution Rural Principal Arterial - InterstateRural Principal Arterial - OtherRural Minor ArterialUrban Principal Arterial - Other220.127.116.1125.819.831.723.418.104.22.168.722.214.171.1247.21112.1955.550.631.962.6100.81.61.72.210.2120.50.1126.96.36.199
20WisDOT’s Axles per Truck Vehicle ClassAxle TypeSingleTandemTridemQuad41.30.752.26170.40.882.40.691.9101.1114.90.112131.2Standard values for WisDOT pavement design using AASHTOWare
21VCD from WI-140 (11/04/2013)Vehicle ClassTotal Count of Trucks% of Traffic420.765259.4764316.2971.89831.14916462.12103.7911121.5213 Total264100Truck count to be used with AASHTOWare as an alternative to WisDOT standard values.
22WI-140 Pavement Survey Pavement survey data input in MicroPaver. Visual distress survey (HS: high severity; MS medium severity)Pavement survey data input in MicroPaver.Pavement Condition Index (PCI) ranged from 13 to 17.
23Contour Map of RuttingRutting Depth (in):Majority of rutting occurring on the outer wheel path.
24WI-140 RuttingSouthbound outer wheel path on November 4, 2013
25Axle Load Spectra (Single) Baseline TrafficBaseline Traffic with OSOW Permits Included
26Axle Load Spectra (Tandem) Baseline TrafficBaseline Traffic with OSOW Permits Included
27Axle Load Spectra (Tridem) Baseline TrafficBaseline Traffic with OSOW Permits Included
28Axle Load Spectra (Quad) Baseline TrafficBaseline Traffic with OSOW Permits Included
29International Roughness Index (IRI) Threshold: 200 in/miFinal IRI at 20 years using only WisDOT standards occurs after 18 years of service using ALS with permits integrated and 6 hour traffic count for VCD.
30RuttingThreshold: 0.5 inFinal rutting at 20 years using only WisDOT standards occurs after 14 years of service using ALS with permits integrated and 6 hour traffic count for VCD.
31Fatigue Cracking Threshold: 20% Final fatigue cracking percent at 20 years using only WisDOT standards occurs after 15 years of service using ALS with permits integrated and 6 hour traffic count for VCD.
32Analysis of ResultsWisDOT standards for AASHTOWare of pavement design does not take OW trucks into consideration.VCD and ALS traffic data could lead to most accurate results.Final stresses of pavement occurring after 20 years of service showed up years earlier using VCD of WI-140 along with OW traffic integrated into ALS.
33Future ResearchLocate roadways with heavy truck traffic and analyze pavement in Illinois, Iowa, and Minnesota conducting field surveys.
34SummaryCertain state highways with high OW traffic (and high regular truck traffic) have serious pavement problems, such as WI-140.Future research will utilize MEPDG to explore effects of OW and SHL trucks on pavement.
35Acknowledgements CFIRE for the financial support of this project. WisDOT for providing permit data (Kathleen Nichols, Lynn Judd, and Ed Lalor)IADOT for providing permit data (Paul Trombino III, Phou Baccam, and Randal Anderson)
36Questions? Contact: Dr. Hani Titi, firstname.lastname@example.org Valbon Latifi,Nicholas Coley,