Performance Evaluation of Whitetopping and Ultrathin Whitetopping Pavements

Abstract

Whitetopping overlay is a relatively new rehabilitation technology as an alternative to hot-mix asphalt (HMA) overlay. It is defined as a portland cement concrete (PCC) overlay on the existing deteriorated HMA pavement to improve the structural and functional capability. When the PCC overlay thickness is less than or equal to 10.16 cm (4 in.), it is referred to as ultrathin whitetopping (UTW). Otherwise it is referred to as normal whitetopping (WT). The objective of this research is to evaluate the performance of in-service whitetopping pavements as a rehabilitation technology by means of a pavement distress survey and falling weight deflectometer test. The performance of whitetopping pavements was characterized by the pavement condition index and pavement distress index. Statistical analysis of the performance was conducted in regard to major factors. Slab thickness, slab size, and pavement age were found to have a significant effect on the performance. The critical distance method and the MODCOMP6 program were applied in this study to backcalculate the layer properties of UTW and WT, respectively. KENSLAB was used to determine pavement response for fatigue analysis.

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