A Performance-Based Approach for Deciding the Age of New Concrete for Thin Epoxy Overlay Application

Thin epoxy overlay application is one of the capital preventive maintenance activities for enhancing bridge deck condition and extending the service life. An epoxy overlay is expected to bridge the cracks and reduce the rate of chloride ion ingress. Highway agency policies and manufacturer specifications require maintaining a 28-day curing period (7-day wet and 21-day dry curing) before the application of an epoxy overlay on bridge decks with new concrete in patches and repairs. Consequently, the contractors wait for 28 days to apply an epoxy overlay. Delaying application time increases project completion time and the cost of construction and mobility. The suitability of new concrete for overlay application and the performance of overlay depend on several parameters including concrete cracking intensity, moisture, and strength. Such parameters depend on concrete mixture ingredients and wet and dry curing periods. This paper presents a performance-based procedure for evaluating the possibility of reducing the 28-day waiting period for epoxy overlay application on new concrete. An experimental program was developed and executed to evaluate the impact of epoxy overlay application parameters and overlay performance using a tensile bond pull-off strength test. The results support developing a performance-based procedure for deciding the age of new concrete for epoxy overlay application. The pull-off bond strength of the epoxy overlay applied at 7, 14, and 21 days following a 7-day moist curing shows the possibility of applying an epoxy overlay before the end of the 28-day curing period stipulated in the current specifications.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: 20p

Subject/Index Terms

Filing Info

  • Accession Number: 01764007
  • Record Type: Publication
  • Report/Paper Numbers: TRBAM-21-03265
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 23 2020 11:17AM