Bridge Preservation

Bridge Preservation Bobby Meade Greenman Pedersen Inc.

Bridge Preservation • • • • • • •

Assumptions Materials Surface preparation Application Service conditions Preservation actions Zone work

Assumptions • Work with agency crews – Quality over productivity

• Minimal/no abrasive blasting • Focus on protective coatings

Materials • Types – Barrier – Inhibitor – Material specification – List of Approved Material – Calcium Sulfonate

Surface preparation • Sequence of work • Stratified rust removal • SSPC SP1

Surface preparation • Washing – Filtering

• Chlorides

Surface preparation • Tool clean – SSPC Sp3, Sp11??? – Lifted edges

Application • Brush apply primer • Inspection tools

Service Conditions • Time-of-wetness (TOW) – Leaking joints – Open joints – Splash zones – UV exposure

Service Conditions (con’t) • Chlorides – KTC 2002 Study – KTC 2010 Study

Chlorides • Field tests not quantitative – “Hot Spots” – Remediation methods

Preservation Actions • • • • •

Quality surface preparation and application Very high performing coatings Washing bridges Grease bearings Replace bearings

Preservation Actions • • • •

Eliminate joints Seal joints Divert water at joints Zone work

Zone Work • • • •

Consider service condition per bridge area Additional preparation in high service area Chloride remediation Match coating to service area

Thank You • Questions?