Restoration of New PCC Pavement With Uncontrolled Cracking in Missouri

A new, properly designed jointed plain concrete pavement (JPCP) is intended to provide longlasting performance with minimal maintenance and infrequent, if any, rehabilitation. The time required for quality control over construction techniques, mix materials, and environmental conditions inhabits a minute portion of the pavement’s potential design life, yet renders so much influence over the probability of achieving that design life. Since every aspect of quality control cannot realistically be fully attained during construction, State specifications usually contain a safety net allowing the project engineer to reject the finished product if any defects become visually apparent. One such defect that randomly occurs is uncontrolled cracking. Cracking has its root in various causes, including but not limited to late sawing, insufficient sawing depth, thermal shock, and high water-to-cementitious materials (w/c) ratios. Whatever the causes are, the result is the same, a panel with an indeterminate reduction in service life because it is no longer a monolith. Typical State specification language universally proclaims, “Remove and replace.” Although the specifications often allow some room for alternative mitigation, the project engineer representing the State agency, not necessarily trained in the nuances of judging relatively harmless versus crippling concrete fractures, generally errs on the side of conservatism and requires the full-depth repair. Unfortunately, the replacement panel, besides being a costly fix, can never duplicate the aggregate interlock properties of the original slab. For the past decade or so the American Concrete Pavement Association (ACPA) and the Federal Highway Administration (FHWA) have placed greater emphasis on using alternative and less severe repair options for cracked panels such as cross-stitching, dowel bar retrofit, undersealing, and partial-depth repair. The Missouri Department of Transportation (MoDOT) has made a concerted effort in the past 5 years to employ these strategies. This paper presents the details of four new JPCP projects that had uncontrolled cracks form soon after construction, and the procedures taken to evaluate and correct the deficiencies.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; Photos; References; Tables;
  • Pagination: pp 55-70
  • Monograph Title: Proceedings. National Conference on Preservation, Repair, and Rehabilitation of Concrete Pavements, St. Louis, Missouri, April 21-24, 2009

Subject/Index Terms

Filing Info

  • Accession Number: 01483823
  • Record Type: Publication
  • Files: TRIS, ATRI, USDOT
  • Created Date: Jun 13 2013 8:54AM