Assessment of Jahn permeable mortar system in a historic bridge abutment application.

Details

• Creators:
  Colgrove III, George W.
• Corporate Creators:
  Vermont. Agency of Transportation. Research and Development Section
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Covered bridges
  • Bridge abutments
  • Mortar
  • Grout
  • Historic preservation
  • Rehabilitation (Maintenance)
  • Permeability
• Publication/ Report Number:
  2015-10
• Resource Type:
  Tech Report
• Geographical Coverage:
  Vermont
• Corporate Publisher:
  Vermont. Agency of Transportation. Research and Development Section
• Abstract:
  Increasingly, the importance of historic preservation is competing with the requirements to enhance ; structural capacity of older unique structures. Preservation of the functional and aesthetic qualities limits ; potential change to meet the expanded needs of the traveling public. The Taftsville Covered Bridge in ; Woodstock, Vermont was deteriorating at a time the public needed increased capacity. Then in 2011, the ; tropical storm remnant of Hurricane Irene rendered the bridge impassable. Significant damage to the ; substructure and superstructure occurred. The bridge required a complete deconstruction and ; reconstruction to correct deficiencies and enhance capacity. Design and construction techniques focused on ; retention of the historic presence and value the bridge offered for over a century and a half. ; The Taftsville Covered Bridge has been repaired and improved many times over its life. This project ; continued that trend by restoring one abutment and pier with added strength by the use of Jahn mortar and ; grout. The existing laid-up stone was repointed with Mortar with minimal addition of new stone where large ; gaps were located. Once the shell formed by the existing stone and the new mortar set up, a flowable grout ; was placed within the stones to bond the stones together, thereby strengthening the substructures. The ; containment of the stones provided increased reliability in addition to strength. The feature the Agency ; hoped to maintain was the high permeability of the abutment. The permeability of the Jahn system ; minimizes damage caused by internal hydrostatic pressures and the effects of chlorides locked within the ; stone substructures observed in other mortars and grout systems.
  More +
• Format:
  PDF
• Funding:
  2011-R-05
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/29001/dot_29001_DS1.pdf
• File Type:
  [PDF - 2.89 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:04f0f66abbf777bf259f72da43f7d57c88afe8aee47ba63e5d08a96d3ffa27e3