INVESTIGATION OF DOWEL BAR RETROFITTING ON PCC PAVEMENT RESPONSES

Abstract

Load transfer across transverse cracks is critical to maintaining satisfactory performance in PCC pavements. As a result of this, the use of dowel bar retrofitting is an essential rehabilitation alternative for PCC pavements. Finite element analysis was used in a parametric study including variables such as PCC thickness, temperature gradient, and subgrade support. Discontinuities were modeled solely with aggregate interlock as well as in combination with dowels. In both cases, load transfer efficiency and the critical slab tensile stresses were computed to examine the immediate theoretical benefits. Analytically, little change in slab tensile stress was exhibited when retrofitted at an LTEδ level below 70-80% depending on the pavement thickness, subgrade support, and temperature gradient. Analytical results were verified using field data from four retrofitted dowel sites.