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EVALUATION OF HPC PAVEMENT IN NELSONVILLE, OHIO

A test of concrete maturity and durability was conducted on a segment of US Route 33 during a road reconstruction project in Nelsonville, Ohio. Three different mixes were compared: Mix A had 30% blast furnace slag and used #57 aggregate; Mix B had 30% blast furnace slag and used #357 aggregate; and Mix C was a standard Ohio Department of Transportation (ODOT) mix with no slag and #57 aggregate. Sections of 1000 ft (305 m) were constructed using each mix. Half of each section was cured using wet burlap and the other half was cured using a spray-on membrane. In one slab in each half section, thermocouples were installed at the center and at one corner to monitor temperatures during curing. Small batches of each mix of concrete were also made in the laboratory and cured in a climate controlled chamber at 5 deg C, 20 deg C, and 40 deg C to determine the maturity function of the mix. The compressive stresses and moduli of rupture of test cylinders and beams were determined after 1, 3, 7, 14, and 28 days of curing. To study the Nurse-Saul maturity method, concrete strength was plotted against maturity (temperature-time factor). Results generally matched laboratory and field data for Mixes B and C (though the data for C was quite scattered), but the Nurse-Saul method overpredicted the strength of Mix A in the field by about 30%. This may be due to field samples being cured in sunlight while the slab with the thermocouples was in the shade. The Arrhenius method was also evaluated by plotting strength versus equivalent age. The theoretical curves generally lay in the middle of the data, but the scatter in the data precludes concluding there is a good fit. In the case of Mix A's field data, the Arrhenius method also significantly overpredicted the concrete's strength. The other objective of this project was to determine which mix would be expected to be the most durable based on it having the least loss of support as determined by profilometer and falling weight deflectometer measurements. The profilometer measurements showed Mix B had the least warping and loss of support between morning and afternoon measurements, at 0.016 in. for water cured concrete and 0.019 in. for membrane cured concrete. Mix C appeared to have the most warping, with 0.023 in. for water cured and 0.027 for membrane cured, the latter based on only one slab, however. The falling weight deflectometer measurements at joints confirmed the profilometer measurements, as Mix B had the least deflection at 0.315 mils/kip in the afternoon. Mix A had the highest value at 0.445 mils/kip; morning values were generally 10-20% higher. Load transfer across the joints was highest for Mix B at 94.95% in the afternoon, while Mix A had the lowest value at 87.5% in the morning. Overall it appears that Mix B experienced the least loss of support.

Language

  • English

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: 45 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00987671
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/OH-2004/018,, Final Report
  • Contract Numbers: State Job No. 14809(0)
  • Files: TRIS, ATRI, USDOT, STATEDOT
  • Created Date: Mar 10 2005 12:00AM