Bridges and Structures

Do It Right! Lessons from the field not to be repeated

Ordinary

• Insure that the waterproofing membrane is in full contact with and bonded to the concrete.
  
• Push membrane tight into corners to eliminate any air bubbles under the waterproofing.

• Make sure all voids over 3/8” are filled before they backfill.
• Remove and repair concrete with porosity or honeycomb as approved by the Engineer.
  

• Even if the plans only call for the surface to
  be painted (no SSF), surface cavities over 3/8” must be filled with mortar before painting.

• Remove and repair concrete with porosity or honeycomb as approved by the Engineer.
• Fill cavities with mortar before waterproofing and backfilling the structure.

• After forms are removed, examine the
  concrete surface for defects.
• Remove thin mortar film from surface before filling cavities with mortar as specified.
  
• Cure work as approved by the Engineer.

• Before backfilling abutments or retaining walls, make sure that surface cavities are filled and waterproofing has been installed correctly.
• Backfill using clean sand, not garbage and concrete debris.