Use of High Molecular Weight Methacrylate to Seal Bridge Deck Cracks: Overview of Research

Cracking in concrete bridge decks is widely regarded as a long-term durability and maintenance problem that requires attention. These cracks propagate through the deck allowing rapid ingress of moisture and chloride ions into concrete interior leading to excessive deterioration due to rebar corrosion. In California, High Molecular Weight Methacrylate (HMWM) has been frequently used as crack sealer with millions of dollars spent annually on work involving Methacrylate applications on state owned bridges. The objectives of this research include; a thorough review of previous research regarding the effectiveness of concrete bridge deck sealers, a nationwide survey investigating the effectiveness and state of practice of using Methacrylate as a crack/surface sealer, and developing guidelines concerning the use of HMWM along with other potential successful sealers. A wide range of application temperature was reported in the literature. However, a range of application temperature between 7oC (45oF) and 29oC (85oF) is recommended. For new decks, it is recommended that HMWM be applied 3-6 months after construction to make sure that chloride concentration does not reach the corrosion threshold value. For old decks careful attention should be paid to the preparation method and the cleanness of both deck surface and cracks. It is recommended that HMWM sealer be applied every 4-5 years or as recommended by the bridge inspection team. For areas not subjected to deicing chemicals/chloride-laden environment, the use of HMWM as crack sealers can help restore the structural bond strength and the flexural strength, only if cracks are narrow and contaminants free. However, more laboratory/field investigations are recommended.

Language

  • English

Media Info

  • Media Type: CD-ROM
  • Features: References; Tables;
  • Pagination: 17p
  • Monograph Title: TRB 86th Annual Meeting Compendium of Papers CD-ROM

Subject/Index Terms

Filing Info

  • Accession Number: 01046391
  • Record Type: Publication
  • Report/Paper Numbers: 07-0144
  • Files: TRIS, TRB
  • Created Date: Feb 8 2007 4:42PM