Forensic Investigation of AC and PCC Pavements with Extended Service Life : Volume 2 : Petrographic Examination of PCC Core Samples at Lankard Materials Laboratory
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Forensic Investigation of AC and PCC Pavements with Extended Service Life : Volume 2 : Petrographic Examination of PCC Core Samples at Lankard Materials Laboratory

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      Technical report.
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      The purpose of this research was to identify flexible and rigid pavements in Ohio with average and above average performance, and determine reasons for these differences in performance. The identification and implementation of factors linked to extended service life will improve performance statewide. FWD and ride quality profiles were measured to evaluate project uniformity, and material samples were obtained from a selected location on each project and tested in the laboratory to determine material properties. Volume 1 of the report includes: the project selection process, FWD and ride quality data, laboratory results of testing on base, subgrade and asphalt concrete pavement samples, and projected services lives using FWD data and the MEPDG. Volume 2 provides the results of laboratory tests and petrographic examinations on the Portland cement concrete cores. Volume 3 contains petrographic analysis of PCC pavement specimens in Cuyahoga County, Ohio containing Blast Furnace Slag Aggregate. Flexible and rigid pavements in Ohio receiving no structural maintenance show an average condition rating of 68 after 20 and 30 years of service, respectively. This performance, coupled with no structural distress being observed on the pavements selected for study indicates pavement design procedures used in Ohio are meeting expectations. Among the items recommended to improve pavement performance include: 1) maintaining subgrade uniformity to minimize localized failures, 2) reducing amounts of Portland cement and using larger aggregate in 451 and 452 concrete, while continuing to test aggregate for D-cracking susceptibility, 3) increasing emphasis on ensuring that dowel bars maintain proper alignment during placement of PC concrete, and 4) continuing the use of performance grading and polymers when designing AC mixes on heavily traveled pavements. Other observations regarding the data used to reach these conclusions include: keeping the PMIS database current, retaining construction records for at least the design life of the pavements, being aware that the effect of surface cracks on flexible pavement performance depends upon whether the cracks are top-down or bottom-up, and the PMIS and straight-line diagrams should be consistent in identifying project limits, project numbers and paving materials. Volume 2 of the report contains petrographic analysis of PCC pavement specimens.
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