2.3.3
Field-Molded Type
ASTM C 920, Type M, Grade P or NS, Class 25, Use [T] [NT] for horizontal
joints. Type M, Grade NS, Class 25, Use NT for vertical joints. Bond
breaker material shall be polyethylene tape, coated paper, metal foil or
similar type materials. The back-up material shall be compressible,
non-shrink, nonreactive with sealant, and non-absorptive material type such
as extruded butyl or polychloroprene rubber.
2.3.4
Hot-Applied Jet-Fuel Resistant Type
ASTM C 920, Type M, Grade P or NS, Class 25, use (T)(NT) for horizontal
joints. Type M, Grade NS, Class 25, use (NT)(M)(G)(A) for vertical joints.
2.4
WATERSTOPS
Intersection and change of direction waterstops shall be shop fabricated.
2.4.1
Flexible Metal
Copper waterstops shall conform to ASTM B 152/B 152M and ASTM B 370, O60
soft anneal temper and 0.686 mm (20 oz mass per sq ft) 20 oz mass per sq ft
sheet thickness. Stainless steel waterstops shall conform to ASTM A 167
and ASTM A 480/A 480M, UNS S30453 (Type 304L), and 0.9525 mm 20 gauge thick
strip.
2.4.2
Rigid Metal
Flat steel waterstops shall conform to ASTM A 109/A 109M, No. 2 (half hard)
temper, No. 2 edge, No. 1 (matte or dull) finish or ASTM A 1011/A 1011M,
Grade 40.
2.4.3
Non-Metallic Materials`
Non-metallic waterstops shall be manufactured from a prime virgin resin;
reclaimed material is not acceptable. The compound shall contain
plasticizers, stabilizers, and other additives to meet specified
requirements. Rubber waterstops shall conform to COE CRD-C 513.
Polyvinylchloride waterstops shall conform to COE CRD-C 572. Thermoplastic
elastomeric rubber waterstops shall conform to ASTM D 471.
2.4.4
Non-Metallic Hydrophilic
Swellable strip type compound of polymer modified chloroprene rubber that
swells upon contact with water shall conform to ASTM D 412 as follows:
Tensile strength 2.9 MPa 420 psi minimum; ultimate elongation 600 percent
minimum. Hardness shall be 50 minimum on the type A durometer and the
volumetric expansion ratio in distilled water at 20 degrees C 70 degrees F
shall be 3 to 1 minimum.
2.4.5
Preformed Elastic Adhesive
Preformed plastic adhesive waterstops shall be produced from blends of
refined hydrocarbon resins and plasticizing compounds reinforced with inert
mineral filler, and shall contain no solvents, asbestos, irritating fumes
or obnoxious odors. The compound shall not depend on oxidizing,
evaporating, or chemical action for its adhesive or cohesive strength.
SECTION 03150A
Page 8
Previous Page
