Concrete Pavements with Small Size Slabs for Heavier Loads or Thinner Slabs

The size of a slab on JPCP concrete pavement has an important effect on the stresses in the concrete. These stresses are the cause of fatigue life and affect the performance of the pavement. A summary on how concrete slabs deform, a discussion on the cause of the stresses and an analysis made with finite elements with ISLAB2000 for new concrete pavements are discussed. The analysis considers a concrete pavement over a granular sub-base and a given truck configuration and loading. The results show tensile stresses in the concrete for different relations between length and thickness of the slabs. A reduction of length from 4,5 m to 1,8 m means that for the same thickness of 23 cm. there is a reduction in stresses from 30 kg/cm2 to less than 20 kg/cm2 or that a reduction in thickness from 23 cm to 15 cm the concrete will have the same stress of 30 kg/cm2. In the same way, a reduction in size with a given thickness will allow for higher axel loads for any given stress. This higher load capacity could mean an increase of axel loads allowed and a reduction in number of trucks, contamination and transportation costs. As a conclusion it can be said: smaller slabs have lower stresses for a given thickness allowing higher axle loads or can be thinner for a given stress with actual axle loads.

Language

  • English

Media Info

  • Media Type: CD-ROM
  • Features: Figures; References; Tables;
  • Pagination: 15p
  • Monograph Title: TRB 86th Annual Meeting Compendium of Papers CD-ROM

Subject/Index Terms

Filing Info

  • Accession Number: 01046105
  • Record Type: Publication
  • Report/Paper Numbers: 07-2358
  • Files: TRIS, TRB
  • Created Date: Feb 8 2007 7:02PM