Section 723 — Dampproofing and Waterproofing Material
723.01Dampproofing Material.
(a)Primer. Conform to ASTM D41.
(b)Asphalt. Conform to ASTM D449.
723.02Waterproofing Material.
(a)Prime r. If preformed membrane sheets are used, provide primers of a type recommended by the manufacturer. If elastomeric spray -applied membranes are used, provide primers conforming to the manufacturer ’s recommendations. Provide a primer with an adhesion to concrete that is at least 150 pounds per square inch when tested according to ASTM D7234.
(b)Preformed membrane sheet. Provide either a rubberized asphalt type or a modified bitumen type. A rubberized asphalt type consists of a rubberized asphalt sheet reinforced with a polyethylene film or mesh. A modified bitumen sheet type consists of a polymer -modified bitumen sheet reinforced with a stitch -bonded polyester fabric or fiberglass mesh. For surfaces other than bridge decks, conform to T able 723 -1. For bridge deck surfaces, conform to ASTM D6153, Type III, and Table 723-2. Table 723-1 Preformed Membrane Sheet for Surfaces Other Than Bridge Decks
Property Test Value
Rubberized
Asphalt Type Modified
Bitumen Type
Tensile strength, minimum ASTM D882 20 lb/in 20 lb/in Elongation at break, minimum ASTM D882 150% at 73.4 °F 25% Water vapor transmission, maximum ASTM E96 0.1 perms 0.1 perms Pliability ASTM D146(1) No cracks No cracks Thickness, minimum – 60 mil s 60 mil s Softening point, minimum ASTM D36 165 °F 210 °F
(1)Base ASTM D146 on a 180- degree bend over a 4.0 -inch mandrel at 10 °F. 867 Table 723-2
Preformed Membrane Sheet for Bridge Decks
Property Test Value
Rubberized
Asphalt Type Modified
Bitumen Type
Tensile strength, minimum ASTM D882 1500 lb/in 1500 lb/in Elongation at break, minimum ASTM D882 300% 300%
Water vapor transmission
(permeance), water method, maximum ASTM E96 0.1 perms 0.1 perms Puncture resistance, minimum ASTM E154 200 lb 200 lb Pliability ASTM D146(1) No cracks No cracks Thickness – 65 - 120 mil s 65 - 120 mil s Softening point, minimum ASTM D36 200 °F 210 °F
(1)Base ASTM D146 on a 180- degree bend over a 4.0 -inch mandrel at 10 °F.
(c)Mastic. Provide mastic consisting of a rubberized asphalt cold- applied sealing compound for use with preformed rubberized sheets. Provide mastic consisting of a blend of bituminous and synthetic resins for use with modified bitumen sheet.
(d)Elastomeric spray -applied membrane. Provide cold spray- applied, elastomeric membrane conforming to Table 723-3. Table 723-3 Elastomeric Spray -Applied Membrane Performance Requirements
Property Test Value
Solids content – 100% Gel time, maximum – 10 sec Tack -free time, maximum – 30 sec Shore D hardness, minimum ASTM D2240 40 Adhesion to concrete, minimum ASTM D7234 150 psi Tensile strength, minimum ASTM D638 2000 psi Tear strength (Die C), minimum ASTM D624 300 lb/in Elongation, minimum ASTM D638 250%
Crack bridging
(80 mils, ⅛ in opening @ -15 °F) ASTM C1305 Pass @ 40 cycles
(e)Elastomeric membrane topcoat. Provide membrane topcoat conforming to Table 723-4. Table 723-4 Elastomeric Membrane Topcoat Performance Requirements
Property Test Value
Solids content – 100% Gel time, minimum – 30 sec Tack -free time, minimum – 2 min Open to traffic – 1 hr Shore D hardness, minimum ASTM D2240 40 Tensile strength, minimum ASTM D638 2000 psi Tear strength (Die C), minimum ASTM D624 300 lb/in Elongation, minimum ASTM D638 250%
Crack bridging
(80 mils, ⅛ in opening @ -15 °F) ASTM C1305 Pass @ 40 cycles
(f)Broadcast topcoat aggregate. Provide washed, clean, durable, angular aggregate with a Mohs hardness of at least 6. Provide aggregate conforming to Table 723-5. Table 723-5
Broadcast Topcoat Aggregate Gradation
Sieve Size Percent by Mass Passing
Designated Sieve
(AASHTO T 27 & T 11) No. 8 100 No. 20 10 No. 30 5 No. 100 1