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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Premature Transverse Slab Cracking of Jointed Plain Concrete Pavement-Environmental and Traffic Effects
Author(s): W. Hansen, D. L. Smiley, Y. Peng, and E. a. Jensen
Publication: Special Publication
Appears on pages(s): 259-270
Keywords: built-in curling stress, concrete pavement, loss of slab support, truck loading
Abstract:Top-down premature mid-slab transverse cracking was investigated for a jointed plain concrete pavement project with joint spacing of 4.88 m and located on I-96 in southeastern Michigan. The environmental (curling/warping) stresses were evaluated using conventional linear temperature gradient analysis (1) and a recent developed method for non-linear gradient analysis (2). Slab deflection profiles and temperature gradients for different times of day demonstrated that a built in upward slab curling was present, equivalent to a linear negative temperature gradient of 0.03 C/mm or greater. This condition increases curling stresses at mid-slab and outer edge during morning hour temperature conditions as the built in curling condition provides added negative thermal gradients. In addition, increased joint and corner uplift occurs, a condition, which favors loss of slab base support. For these conditions, finite element analysis for truck tandem axle loading at the edge of transverse joints predicts substantial increased slab deflection and top tensile stresses. Further, loss of contact moves the maximum tensile stress towards the mid slab region along the outer edge, where also curling stresses are highest. The combined tensile stresses were found to be significant and can initiate top down transverse cracking. Once surface cracks are initiated they tend to propagate inward and downward from repeated truck loading.
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