Long-Life Slab Replacement Concrete

This research was initiated following reports of high incidence of cracking on Florida Department of Transportation (FDOT) concrete pavement replacement slab projects. Field slabs were instrumented for data acquisition from high-early-strength concrete pavement replacement slabs placed on projects funded by FDOT. Data were collected for three slabs located in Jacksonville, Florida, and Gainesville, Florida. A battery of laboratory tests was simultaneously conducted on the FDOT-approved concrete mixture designs used in the instrumented field slabs in addition to mixtures with variable chloride-based accelerator dosage. Temperature and strain data, as well as physical and thermal data, were acquired from slabs from the construction projects. The physical and thermal data acquired from the field were used for modeling description and verification. Subsequent to the field testing and data acquisition, the slabs were inspected for the presence of cracking. Laboratory testing included as-received materials characterization, heat of hydration measurements using isothermal and semi-adiabatic calorimetry for temperature rise assessment, and strength maturity curves for strength assessment. Using ConcreteWorks and HIPERPAV III, the findings indicated that adherence to the approved mixture design is critical. High placement temperatures and concrete placement during the day increased concrete cracking potential. Field additions of accelerator in excess of the approved mixture design were also found to increase the cracking potential.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 306p

Subject/Index Terms

Filing Info

  • Accession Number: 01561008
  • Record Type: Publication
  • Contract Numbers: BDV25-977-01
  • Files: TRIS, ATRI, USDOT, STATEDOT
  • Created Date: Apr 20 2015 1:36PM