Whitetopping overlay is a concrete overlay on the prepared existing hot mix asphalt (HMA) pavement to improve both the structural and functional capability. It's a relatively new rehabilitation technology for deteriorated HMA. If the slab thickness is less or equal to 4 in., it is referred to as ultra-thin whitetopping (UTW). "WT" is used to refer to concrete overlay thicker than 4 in. In this research, the term "whitetopping" is used to refer to both WT and UTW in general. The primary objectives of this study are to catalog the whitetopping (WT) and UTW projects in Wisconsin, document pertinent design and construction elements, assess performance and estimate a service life of these projects. A comprehensive literature review was performed. A database of the WT and UTW projects was established covering 18 projects built from 1995 to 2007 in Wisconsin. The performance of these WT and UWT projects were assessed, by mean of shear strength tests on field cores, falling weight deflectometer (FWD) tests on selected projects, and field distress survey on in-service projects. FWD backcalculation methods for WT and UTW pavements were studied and a Critical Distance Method was proposed and utilized for UTW pavement. Fatigue life was analyzed using 18kip, 22kip and 26kip single axle load level. Performance assessment was conducted using both Pavement Condition Index (PCI) and Pavement Distress Index (PDI). The performance of whitetopping projects in Wisconsin was found comparable to that in other states. Whitetopping overlay thickness, joint spacing and pavement age were found to have significant effects on pavement performance.

Introduction. Paving roller-compacted concrete is a multi-component, artificially obtained stone-like material that is obtained from a paving roller-compacted concrete mixture, which is characterized by increased requirements for tensile strength at bending, waterproofing, water absorption, abrasion and frost resistance. Applying the technology of arrangement of pavement layers from paving roller-compacted concrete, allows to achieve significant savings in energy consumption when using machines and equipment, to ensure less shrinkage of concrete during curing due to low water-cement ratio. Problem statement. To compare the characteristics and arrangement of traditional cement concrete and paving roller-compacted concrete, to find out whether roller-compacted concrete is an alternative to traditional concrete. Since Ukraine currently lacks, with the exception of certain areas, practical experience in the construction and maintenance of roads with a surface of rolled-compacted concrete, to establish its advantages and disadvantages. Purpose. Perform an analysis of the technology of arrangement of roller-compacted concrete. Compare the physical and mechanical characteristics of roller-compacted concrete and traditional cement concrete. Materials and methods. In the work, the analysis of domestic and foreign sources by topic was carried out, laboratory research was carried out. An experimental study of paving roller-compacted concrete was performed, literary sources of Ukrainian and foreign origins were analyzed. Results. The physical and mechanical characteristics of hardened cement concrete were determined and compared with traditional cement concrete.