Post-Construction Report : Experimental Feature 10-04

Post-construction report.PDFTech ReportWA-RD 795.1WA 10-04Epoxy coatingsFiber reinforced materialsFiber reinforced polymersReinforcing barsDowel bar retrofitFalling weight deflectometersLoad transferLoadsWashingtonWashington (State). Dept. of Transportation. Office of Research and Library ServicesAnderson, Keith W.Uhlmeyer, Jeff S.Russell, MarkKinne, ChuckWeston, JimDavari, MoeKromm, KevinWashington (State). Dept. of Transportation. Materials LaboratoryWashington (State). Dept. of TransportationUnited States. Federal Highway AdministrationNTL-HIGHWAY/ROAD TRANSPORTATION-MaterialsNTL-HIGHWAY/ROAD TRANSPORTATION-Construction and MaintenanceNTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and PerformanceUS Transportation CollectionGlass Fiber Reinforced Polymer (GFRP) dowel bars were installed on one new construction project and two dowel barretrofit projects to evaluate the performance of this type of dowel bar in comparison to steel dowel bars installed on the samecontracts. The primary data collection site (I-82, Yakima River Br. Vic. to Granger) included 67 joints retrofit with GFRPdowels and an equal number of epoxy coated doweled joints that serve as the control section.Falling weight deflectometer (FWD) testing will be used to evaluate the load transfer efficiency (LTE) of the two types ofdowel bars. Periodic coring of the concrete at the joints is also planned to examine the condition of the GFRP and epoxycoated dowels.Post-installation FWD testing of the primary data site revealed that the average LTE of the joints retrofit with epoxycoated dowel was higher than the joints retrofit with the GFRP dowels and that the difference was statistically significant. PreinstallationFWD testing showed no difference in the LTE of the joints in the areas where the GFRP and epoxy coated dowelswere installed