Forensic Investigation of AC and PCC Pavements with Extended Service Life : Volume 3 : Petrographic Examination of Blast Furnace Slag Aggregate Concrete Cores taken from PCC Pavements in Cuyahoga County , Ohio
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2011-09-01
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Edition:Technical report.
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Abstract: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 3 of the report contains petrographic analysis of PCC pavement specimens in Cuyahoga County, Ohio
containing Blast Furnace Slag Aggregate.
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