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



English
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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:
  • 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.

  • Format:
    PDF
  • Funding:
    2011-R-05
  • Collection(s):
  • Main Document Checksum:
  • Download URL:
  • File Type:
    Filetype[PDF-2.89 MB]

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