PREFORMED SILICONE JOINT SEALING SYSTEM
R.J. Watson, Inc. * 78 John Glenn Drive, Amherst, NY 14228 * Ph 716-691-3301 * Fx 716-691-3305
DESCRIPTION
The work shall consist of furnishing and placing the Preformed Silicone Joint Sealing System as detailed and as shown on the plans as manufactured by R.J. Watson Inc.*
78 John Glenn Drive, Amherst, NY 14228 * Ph. (716) 691-3301 * Fax (716) 691 3305
All necessary materials and equipment required for the installation shall be obtained through an approved supplier.
The approved supplier shall furnish a qualified, experienced technical representative to advise the engineer and contractor concerning proper installation procedures.
DEFINITIONS
The following definitions shall apply:
Joint Seal – The Preformed silicone joint seal.
Locking Adhesive – A non-sag, high modulus silicone adhesive.
MATERIALS
Joint Seal – This material shall meet the following requirements:
Property Test Method Typical Value
Durometer (Shore A) ASTM D 2240 55 ± 5
Tensile (psi) ASTM D 412 550 psi min.
Elongation (%) ASTM D 412 350% min.
Tear (die B ppi) ASTM D 624 80 ppi min.
Compression Set ASTM D 395 30%
At 350ºF 22 hrs.
Operating Temperature Range -60°F to 450°F
Specific Gravity 1.51
(Revised 8-9-2005)
Heat age data at temperatures above 300°F does not apply in this application but in general, tested at 302°F and 437°F, no degradation occurs causing functional concern. The operating temperature range indicates the material remains elastomeric in nature at these temperatures.
SILICOFLEX ADHESIVE
Product Description
Silicoflex Locking Adhesive is a one part, methodoxy cure, silicone sealant that cures quickly and adheres to concrete, elastomeric concrete, steel and Silicoflex Preformed Seal.
Physical Profile
Property Test Method Typical Value
Sag/Flow ASTM C 639 3/16” max.
Color Visual Black
Hardness ASTM C 661 20-25
Tack Free Time ASTM C 679 30 min. max,
Cure Through @ 750°F/50% RH 16 hrs. max.
To ¼” thickness
Skin over time @ 750ºF/50% RH 5 min. max.
(Tooling Time)
Resistance to U.V. ASTM C 793 No cracking, &
Ozone chalking or
Degradation
Peel adhesion to substrates ASTM C 794 50 PLI
CYCLIC LOADING TEST
All Formed in Place Joint Sealing Systems shall be pre-qualified by undergoing and passing a CYCLIC LOADING TEST.
Test Sample Length 2 Feet min.
Joint Skew 45°
Number of Cycles 200 min.
Joint Opening 2 inches
Movement ± 1”
Temperature -20ºF
Any rips, tears, or bond failure will be cause for rejection.
(Revised 8-9-2005)
BASIS OF ACCEPTANCE
Joint Seal – Acceptance shall be by manufacturer certifications.
CONSTRUCTION DETAILS
Prepare joint blockout to specified dimensions. The block out shall be clean, dry and consist of sound (not spalled or loose) concrete. To achieve this condition, sand blasting is recommended. After sand blasting, be sure to blow out the residual sand and debris with dry compressed air.
Cleaning of the seal should be accomplished prior to installation by cleaning with a cloth saturated with De-Natured Alcohol. The joint interfaces should then be primed with the Silicoflex P-200 Primer.
Apply a 3/8” thick bead of Silicoflex Locking Adhesive approximately 1-1/4” down below the surface of the joint interface on both sides. For Silicoflex Model SF225, apply a 3/8” thick bead of Silicoflex Locking Adhesive approximately 2” down below the surface of the joint interface on both sides. For Silicoflex Model SF400, apply a 3/8” thick bead of Silicoflex Locking Adhesive approximately 2-1/2” down below the surface of the joint interface on both sides.
Position the silicone seal to the proper depth. Apply a bead of locking adhesive along each side to the top of the serration. Tool the locking adhesive twice to insure complete contact with the vertical edge.
Vertical curbs, directional changes and field splices require the Silicoflex Locking Adhesive ad a bonding agent.
METHOD OF MEASUREMENT
The work shall be measured as the total linear meters of joint seal incorporated into the completed work.
BASIS OF PAYMENT
The unit price bid per linear meter of joint seal shall include the cost of furnishing all labor, materials and equipment necessary to complete the work in accordance with the joint seal manufacturer’s recommendations.
(Revised 8-9-2005)