Long term monitoring of broken and seated pavements : executive summary.

Details

• Creators:
  Rajagopal, Arudi ; Minkarah, Issam
• Corporate Creators:
  University of Cincinnati. Department of Civil and Environmental Engineering
• Corporate Contributors:
  Ohio. Dept. of Transportation ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Reflection cracking
  • Crack and seat treatment
  • Pavement maintenance
  • Comminution
  • Cracking
  • Pavement cracking
  • Slabs
  • Pavement performance
  • Overlays (Pavements)
  • Surface course (Pavements)
  More +
• Publication/ Report Number:
  FHWA/OH-2002/024
• Resource Type:
  Tech Report
• Geographical Coverage:
  Ohio
• Edition:
  Executive summary.
• Corporate Publisher:
  University of Cincinnati
• Abstract:
  This report presents details of a study conducted by the University of Cincinnati (UC), in association ; with the Ohio Department of Transportation (ODOT), to evaluate the long term performance of asphalt ; overlays on broken and seated (B/S) concrete pavements, using field experiments. The primary purpose ; of this study is to evaluate the effectiveness of breaking and seating as a rehabilitation strategy for ; retarding reflective cracking in asphalt concrete (AC) overlays on jointed reinforced concrete pavements ; (JRCP). Several test sections were constructed by milling the original AC layer, breaking and seating the ; concrete slabs and constructing new AC overlays. Control sections were constructed adjacent to the B/S ; sections in the same way, but without breaking the underlying concrete slabs. ; Two types of pavement breakers were used in this study, namely guillotine and pile hammer. The ; majority of the concrete slabs were broken into 0.46 m (18") segments. The extent of breaking was ; closely monitored. The performance of the test sections was monitored for a total period of nine years. ; The monitoring data included deflection measurements, crack mapping, pavement condition surveys ; (PCR) and roughness surveys on the original pavement and on the overlay. The results indicate that the ; B/S treatment has a significant effect on the structural response and behavior of the resulting pavement. ; Breaking the concrete slabs into smaller pieces resulted in a reduction in the flexural strength, an increase ; in the surface deflection (50% to 100%), and a decrease in AREA and Spreadability (20 to 30%). The ; Edward Ratio has been consistently high on B/S pavements (up to 30%) indicating a structural behavior ; closer to flexible pavements. ; The reflection cracks on all the control sections appeared within two years after the AC overlay and ; within four years, more than 80% of the joints in all the control sections showed reflection cracks. The ; B/S sections were relatively free of cracks after nine years. In particular, the test sections where a pile ; hammer was used had less than 17% joint reflection cracks, while the control sections in the vicinity had ; 80% to 100% joint reflection cracks. This result clearly indicates that breaking and seating has been ; extremely effective in delaying and minimizing reflection cracking. ; The primary difference in cost of control and B/S sections could be in the type, extent and timing of ; major rehabilitation. The mitigation of reflection cracking will cause the pavement PCR and ; serviceability to remain higher for a longer period of time than if the reflection cracks were allowed to ; come through. The lack of reflection cracking translates into a delay in future maintenance and ; rehabilitation which will more than make up or the extra cost of breaking the pavement. The difference ; in the cost will ofcourse depend on the type, extent and timing of major rehabilitation. ; Based on the results of this study it is concluded that breaking and Seating is an effective technique for ; the rehabilitation of composite pavements (AC over JRCP) and it provides a cost-effective solution for ; the maintenance and rehabilitation of in-service composite pavements.
  More +
• Format:
  PDF
• Funding:
  State Job No. 14670(0)
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/20622/dot_20622_DS1.pdf
• File Type:
  [PDF - 11.51 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:3385f62152996b6c8108d5f2f59c0729dcba38f29720734a629403a2f42baf8231e457729395065b5163ec7d0f87a3206e166c02b905d19c93a6da0f4839856d