Lu, Ping; Freeseman, Katelyn
Iowa Department of Transportation
Bond strength (Materials); Bridge decks; Chloride content; Epoxy coatings; Evaluation and assessment; Laboratory tests; Overlays (Pavements); Pavement performance; Service life
The objectives of the project proposed here include: 1) evaluate the bond strengths of two types of overlays (i.e. thin epoxy overlay and LSDC overlay) and investigate the change in bond strength over time with on-site testing; 2) understand the long term performance of epoxy overlays and rigid overlays via accelerated lab testing; 3) investigate how existing chloride that has been sealed in a deck by an epoxy overlay migrates and how that might relate or contribute to additional deck deterioration; 4) identify factors that affect the initial and long term performance of overlays; and 5) estimate the expected service life for these two types of overlays. The following tasks are proposed for this work. These tasks have been developed to allow for the evaluation of the performance of epoxy overlays as compared to the performance of LSDC overlay using both on-site and lab testing. Task 1. information collection: collect needed information on bridges to be tested. Task 2. field testing: on-site pull-off testing and visual inspection. Task 3. laboratory testing: accelerated freeze-thaw and salt treatment lab testing. Task 4. reporting.