728— Waterproofing

728.1 Description

1 Waterproof or damp proof Portland cement concrete surfaces . Prepare the surface, and waterproof designated bridge decks and Portland cement concrete structures using the described method.

728.1.1 Substructure Waterproofing

1 Waterproofing Portland cement concrete surfaces for substructures is applicable to protecting the inside of spandrel -filled arches, backs of abutments, retaining walls, etc.

728.1.2 Bridge Deck Waterproofing

1 Bridge deck waterproofing is performed on concrete bridge decks before placing an asphalt concrete overlay. This waterproofing system serves as a barrier against penetration of water, salt solutions, and other contaminants that cause the deterioration of bridge deck concrete.

728.2 Materials

728.2.1 Substructure Waterproofing

1 Use the following materials and coats for this method of waterproofing: • 1 asphalt primer coat conforming to ASTM D41 ; • 3 asphalt mop coats conforming to ASTM D449 , Type A below ground and Type B above ground; a lternate mop coats with fabric applications ; and • 2 applications of waterproofing fabric conforming to ASTM D173. 2 Ensure that the asphalt saturation conforms to ASTM D449,Type A below ground and Type B above ground.

728.2.2 Substructure Waterproofing (Alternative)

1 Provide a waterproofing membrane that incorporates a cross -laminated, high-density polyethylene film adhered to a flexible, self -adhesive, rubberized asphalt in conjunction with a primer recommended by the membrane manufacturer for the membrane system being used. 2 Use membranes listed on Qualified Product s List 67 that meet the following requirements when tested with the referenced test method.