KHIT 125, Pavement Forensics Phase Two

The intent of collecting pavement forensic data will allow design engineers to better understand the existing pavement structure quality and characteristics that can be used in future pavement designs. KTC will coordinate with KYTC maintenance staff to secure the necessary in-house traffic control to perform the following work items as noted previously in table one and described below: Falling Weight Deflectometer (FWD), Ground Penetrating Radar (GPR), coring, rutting measurements, and pipe inspections. -Perform FWD testing on 250 ft. intervals, and back calculate sub-grade and existing pavement structure modulus values, and stiffness values. -Perform GPR testing on approximately one foot intervals to determine pavement and sub-base thickness variation. -Core pavement structure and hand-dig through sub-base material to sub-grade for verification thicknesses. Identify crack mode (top down/bottom up), and classification of existing sub-base. Additional cores maybe taken to assist with both FWD and GPR data if pavement conditions change dramatically throughout the project. -Collect rutting measurements at each core location in the right and left wheel path. -Perform pipe inspections using a video pipe inspection system on the storm drains to quantify the existing drainage structure condition.