KHIT 137, Pavement Forensics and Pavement Design Technical Assistance Phase II

Abstract KHIT 137, Pavement Forensics and Pavement Design Technical Assistance Phase II PI Brad Rister Co-I Kean Ashurst 5/1/2020-12/31/2022 KYTC’s pavement management group oversees the statewide pavement rehabilitation program utilizing both in house pavement design engineers and four competitively selected highway design consultants. Typically, the Department will provide each project, whether designed in-house or with consultant services, with a pavement design/rehabilitation concept and construction strategy. In some cases this pavement design/rehabilitation concept may only require an overlay to the existing roadway section if the current pavement composition is well understood, the current pavement is not structurally deficient, and other contributing pavement failure phenomenon are being held to a minimum. However, in some pavement rehabilitation projects there may be insufficient information regarding the current in-place pavement conditions and/or the phenomenon creating the pavement failure. Any deficiency in this information will make it difficult to select the most appropriate pavement design/rehabilitation concept for a given project. Therefore, it may be necessary to gather additional field data to help support the pavement design/rehabilitation concept on projects with insufficient pavement data. For rehabilitation projects with insufficient pavement data, KTC proposes to collect and process the necessary field data through a series of investigative tasks commonly known as a pavement forensic analysis. A pavement forensic analysis may include both destructive and non-destructive testing utilizing technologies such as: ? Falling Weight Deflector-meter (FWD) to determine pavement and sub-base stiffness and modulus values. ? Ground Penetrating Radar (GPR) to determine pavement layer thickness and composition. ? Pavement coring for thickness/composition verification, and crack propagation direction determination (top-down verses bottom-up cracking) ? Optional: Cross-drain/edge-drain camera inspection. Once the pavement forensic data is collected and processed. It will then be placed into a storybook format and geospatially located on KYTC’s roadway base map via an ArcGIS platform. All information will be easily readable and obtainable through a series of project narratives, charts, graphs, photos, and videos to assist the Cabinet’s pavement design engineer when determining the most appropriate pavement design/rehabilitation concept. In certain situations, KTC may also assist the Cabinet in performing multiple pavement design calculations for different pavement type alternates on a project-by-project basis to support the most economical and beneficial pavement design/rehabilitation concept.