EMSEAL
Expansion Joints and Pre-Compressed Sealants


 

 

The Evolution of Extruded Parking-Deck Expansion Joint Seals

1. Compression Seal

Description:
• Multi-cell Neoprene extrusion installed into epoxy "lubricating adhesive" applied to joint face.

Advantages:
• Best technology available at its introduction shortly after World War II
• Predecessor of all modern extruded expansion joint seals

Limitations:
• Anchoring system reliant on adhesive in tension - weakest way to use adhesive
• Squeezes itself in and out of joints
• Limited movement: Max. joint size limited by relaxed width of seal. Min joint size limited by complex interior webbing.
• Compression set: loses ability to exert backpressure against substrate - substrate pulls away from seal
• Rigid "box" structure combined with poor anchoring system cannot handle vertical differential deflection (up and down) movement.
• Neoprene thermoplastic rubber extrusion cannot be heat-welded. Terminations and transitions in plane and direction as well as repairs must be glued. Glue dries out over time.

2. Inflated Seal

Description:
• Double or single barrier Neoprene thermoset rubber extrusion with joint face-applied epoxy "adhesive-in-tension" anchoring system
• Seal is inflated during installation to improve bond.

Evolutionary Advantages:
• Reduced interior webbing offers increased movement range over compression seal

Disadvantages:
• Anchoring system reliant on adhesive in tension - weakest way to use adhesive.
• Approx. 18 square inches of adhesive in tension per foot of joint.
• Bond line stressed by: peeling action during up and down vertical deflection; gravel and sand forced by tires into epoxy-to-seal interface; and standard tension from lateral movement
• Does not protect joint edge. Blockouts with elastomeric header required to waterproof joint edge and prevent cracking and spalling
• Durable terminations, transitions and repairs difficult. Neoprene thermoset rubber extrusion cannot be heat-welded. Terminations and transitions in plane and direction as well as repairs must be glued. Glue dries out over time.
• Poor extrusion tolerances of Neoprene yields excessive bulk at flexural nodes in gland, inhibiting movement and excessively stressing epoxy bond.
• Dependent on extremely smooth joint face. Relies on epoxy to fill irregularities.

 

   
3. Multi-Cell Blockout Adhered

Description
• Blockout-anchored multi-cell extrusion with integral punched flanges encapsulated in elastomeric concrete nosing material.

Evolutionary Advantages:
• Superior anchoring system to compression seal and inflated seal.

• Elastomeric concrete nosing encapsulates punched flanges, mechanically anchoring seal using adhesive in shear - strongest way to use adhesive.

• Over 45 square inches of adhesive in shear per foot of seal.

• Not affected by minor irregularities in joint face.

Disadvantages:
• Limited movement. Max. joint size limited by relaxed width of seal. Min joint size limited by complex interior webbing.

• Rigid "box" structure inhibits vertical differential deflection (up and down) movement capabilities.

• When retrofitting joint-face adhered technologies, requires cutting of blockouts. In new construction, blockouts can be formed.

4. Double Barrier Blockout Adhered

Description
• Double-Barrier Santoprene thermoplastic rubber extrusion with integral punched flanges encapsulated in elastomeric concrete nosing material.

Evolutionary Advantages:
• Latest evolution of gland design. Combines high-movement of double barrier inflated seal with integral flanges for secure blockout mounting.

• Elastomeric concrete nosing encapsulates punched flanges, mechanically anchoring seal using adhesive in shear - strongest way to use adhesive.

• Weldabilty of Santoprene extrusion allows for continuous seal through changes in plane and direction and offers repairability.

• Over 45 square inches of adhesive in shear per foot of seal.

• Not affected by minor irregularities in joint face.

Disadvantages:
• When retrofitting joint-face adhered technologies, requires cutting of blockouts. In new construction, blockouts can be formed.

 

--The Evolution of Extruded Parking Deck Seals.pdf--
 



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EMSEAL LLC. 120 Carrier Drive, Toronto, ON M9W 5R1

   

 


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Last Modified: April 26, 2015

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