Concrete Pavement Performance Center of Excellence (CPP-COE) - supplemental services

988400290PDFTech ReportSPR-1652Contract 2013-0068 Z10Coarse aggregatesDurabilityPavement performanceCracking of concrete pavementsSpallingFrost susceptibilityTest sectionsUnited StatesMichiganUniversity of Michigan. Dept. of Civil and Environmental EngineeringHansen, WillStaton, John F.Bennett, AndyUniversity of Michigan. Dept. of Civil and Environmental EngineeringMichigan. Dept. of Transportation. Office of Research AdministrationUnited States. Federal Highway AdministrationUS Transportation CollectionThe US-23 Aggregate Test Road was constructed in 1992 with the main purpose to determine the influence of coarseaggregate of varying frost susceptibility on long-term concrete durability. The pavement structure for the entire Test Road consistsof a 10.5 inch, 27 ft. jointed reinforced concrete pavement (JRCP) constructed on a 4 in. asphalt-treated permeable base (ATPB)layer on top of a 3 in. gravel separator layer. Half of each test section was built on the original poorly-draining subbase with theother half constructed on a \ue2\u20ac\u153select\ue2\u20ac? well-draining permeable sand subbase. The report findings are based on latest field investigationin 2016 and previous year\ue2\u20ac\u2122s field tests, aggregate properties, concrete mix proportions, periodic distress surveys, and IRI datacollected by MDOT personnel. The main findings are: No joint durability distress was found. This is attributed to excellent airvoidsystem, low concrete permeability and good drainage. Also, pumping erosion related distress has not developed. One sectionhas developed full lane-width mid-panel cracking in over 75% of panels in the truck lane by year 5. These cracks turned into workingcracks leading to spalling requiring full-depth concrete repairs in 29% of truck-lane panels, while between 0% and 4% of panelsin the other four sections required full depth repair. Dowel looseness was pronounced in all sections since 2009 leading to lowload transfer (30%-60%). Loss of load-transfer and excessive outer corner joint deflections (~ 40 mils/9000 lb by FWD) has resultedin a permanent transverse joint settlement of 0.1-0.2 inches. A downward slab bending combined with daily loss of slabsupport at joints from early morning curl has promoted top-down mid-panel cracking, which is developing in all sections. Theinformation obtained from this study is helping MDOT pavement engineers design for 30 to 50 year pavement life for Michigan\ue2\u20ac\u2122ssevere traffic loading and environmental condition