BEJS Bridge Joints

Emseal BEJS Allco Waterproofing

The Emseal BEJS SYSTEM builds on a track record of over 30 years of sealing bridge joints with precompressed, impregnated foam sealants.

The system is comprised of a precompressed, silicone impregnated foam hybrid installed with a field-applied epoxy adhesive on the joint faces and sealed with Pecora silicone.

BEJS can be used for:

  • Watertight, traffic durable, joint-face-adhered, precompressed, primary seal for retrofit and new expansion joints in road bridges, wing walls, abutments, jersey barriers, longitudinal joints, precast panels, etc.
  • Ideal for new construction and retrofit bridge preservation of old or failed joint systems in concrete or rebuilt joint edges. Use in embedded metal angles where demolition or removal of the metal angles is not feasible and where existing joint opening is suited to the movement capability of BEJS.
  • Ideal for lasting replacement of failed caulk joints.

Watertight: The tensionless silicone bellows is installed just below the deck surface. This ensures watertightness is achieved at the deck surface.
Compression: Unlike liquid-applied sealants, compression seals, and inflated seals, the BEJS SYSTEM does not rely on adhesion in tension. Instead the material is precompressed in the factory ensuring that the spring energy of compression is always pushing back on the substrate.
Non-Invasive Anchoring: there are no hard metal-to-concrete connections in the system; this includes embedded pins, anchors, screws, bolts or tracks, trays or rails. The system is locked to the joint faces by means of the 1) backpressure of the foam; 2) the epoxy adhesive, and 3) the injected silicone sealant band at the joint face to foam and silicone bellows interface.
Continuity of Seal: as in all EMSEAL expansion joint systems, continuity of seal through changes in plane and direction is an essential performance differentiator. Details for watertight, field-fabricated transitions from deck to wall, at curbs, sidewalks, parapets, tees, and crosses are available with the BEJS SYSTEM.
Aesthetics & Versatility: Standard bellows colour is black; with grey also readily available (other custom colours can be discussed with Allco), uniform bellows appearance, fuel resistance, and an enhanced ability to handle variations in joint size are among other system features.
Installation: Fast, easy and can be staged to preserve partial traffic flow.

Emseal BEJS Installation

Emseal BEJS expansion joints

Composition

  • BEJS is produced by coating an impregnated cellular foam with AASHTO-approved, Pecora 301 highway-grade silicone.
  • The expanding foam is cellular polyurethane foam impregnated with a water-based acrylic containing a high performance micro-cellular additive.
  • The silicone external facing is factory applied to the foam at a width greater than maximum joint extension and is cured before final compression. 
  • Silicone application and curing takes place in a factory-controlled environment. In contrast to field applied liquid sealant and backer rod installations, no movement takes place during curing that can cause deformation or stresses in the material.
  • When compressed, a bellows is created in the coating. As joint movement occurs the bellows simply folds and unfolds free of tension on the bond line, and virtually free of tensile stresses in the silicone material. Sizes under 25mm (1") have a single-curve convex bellows; sizes from 25mm (1") through 100mm (4") have a dual-curve convex bellows. 
  • The foam provides a resilient backing to the silicone coating, making the system capable of resisting reasonable transient point loads. 
  • BEJS SYSTEM is supplied in 2mtr (6.56') shrink-wrapped lengths (sticks). It is precompressed to less than the joint size for easy insertion. After removal from the shrink-wrap and hard board restraining packaging, it expands gradually.

Limitations:

  • Capable of movements of +/-50% (100% total) of nominal material size.
  • Substrates must be parallel, plumb and capable of resisting approx. 2.5 psi backpressure from the foam. 
  • Standard sizes from 12mm (1/2") to 100mm (4"). Other sizes available subject to review of application: consult Allco.
  • Fuel Resistance: Silicone sealant is not degraded by contact with fuel. Some swelling of the material will normally occur, but it will return to its original shape upon evaporation of the fuel.
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Temuka Bridge

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BEJS - Product Brochure

 

BEJS - Tech Data

 

BEJS - Install Data

 

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