2016 – 2021 Performance Monitoring of Mechanistic-Empirical Designed Pavements
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2025-11-01
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Edition:Interim Report
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Abstract:The Illinois Department of Transportation (IDOT) began conducting pavement performance monitoring surveys on mechanistic-empirical designed pavements in 1986. These surveys and analyses provide the necessary data to verify and validate the design procedures and life-cycle cost models used in the pavement selection process. The pavement distress surveys were conducted by IDOT’s Bureau of Research (BR) staff until 2000 when staffing shortage caused the effort to cease. BR resumed the monitoring efforts in 2010 and has since used a consulting engineering firm to help with these activities. Monitoring of M-E designed pavements ensures the department is meeting the requirements of 20 ILCS 2705/2705-590.Three types of pavements are currently being utilized and monitored by the department: full-depth hot-mix asphalt(HMA), jointed plain concrete pavements (JPCP), and continuously reinforced concrete pavements (CRCP). IDOT has three supplement designs that are being tracked, Full-Depth HMA pavement over rubblized PCC, Unbonded JPCP overlay, and CRCP Unbonded Overlays. There are a total of 170 contracts (split into 324 sections) that make up the monitoring effort, of which 156 are HMA, 104 are JPCP, and 64 are CRCP. Contracts may be further broken down into sections based on differences in cross sectional elements (i.e. thickness, joint spacing, etc.).For each section, BR collects distress data, weighted average rut depth, weighted average ride quality, weighted average daily traffic values, and maintenance activities. Graphs comparing patching quantities and overlays as a function of the pavement age are presented for each of the three types of pavements.
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