Development of a Probabilistic Joint Opening Model Using LTPP Data

Joint opening of concrete pavement is caused by changes in the temperature and humidity of concrete slabs. The joint opening influences load transfer efficiency (LTE) between two adjacent slabs and performance of sealants of the joint. The joint opening has been commonly predicted by the AASHTO joint opening model in the design of concrete pavement. The magnitude of joint openings is variously distributed in a given pavement section and the AASHTO model theoretically predicts the average joint opening of a section. As the result, the AASHTO model inevitably underestimates a considerable portion of the joint opening. Joint sealants are designed based on the predicted joint openings. Thus, joints that show larger openings than the predicted size may experience faulting at an early age of the concrete pavement owing to loss of the LTE due to pumping of base materials through the failed joint sealants. In addition, unexpected spalling may develop because of intrusion of incompressible materials into the joints through the torn sealants. Intruded incompressible materials induce compressive stress at the joints when the concrete slabs expand and the joints are closed because of temperature rise. In this study, factors influencing the variations in the joint openings of concrete pavements were investigated using data of the LTPP SMP sections. A probabilistic joint opening model using the upper bound of the 90% confidence interval of the joint opening was developed in order to mitigate underestimation of the joint opening. The newly developed joint opening model was validated using a series of data pertaining to joint movement measured at the Korea Highway Corporation (KHC) test road.

Language

  • English

Media Info

  • Media Type: CD-ROM
  • Features: Figures; References; Tables;
  • Pagination: 26p
  • Monograph Title: TRB 86th Annual Meeting Compendium of Papers CD-ROM

Subject/Index Terms

Filing Info

  • Accession Number: 01046091
  • Record Type: Publication
  • Report/Paper Numbers: 07-0556
  • Files: TRIS, TRB
  • Created Date: Feb 8 2007 5:08PM