Slab Seal Expansion Joint for Bridge

Installation Procedure:

• Steel structure are to be inserted as shown above in either sides, little lowered position
• Top of the insert shall be at par with finished level of wearing coat to maintain the camber
• Steel structure and main reinforcement bar shall be anchored with proper welding
• If required spacer bar shall be used for proper alignment of bolt and levelling of steel insert
• Steel structure are to be packed with proper mixture of concrete as same as deck casting
• With proper alignment, manufacturer's recommended adhesive to be applied on the steel inserts and the elastomeric slab seal shall be placed over there
• Elastomeric seal shall be tightened with S.S. nut & bold and shall be locked with washer
• The cavity of the nut & bolt shall be filled with elastomeric plug, duly applying the adhesive recommended by the manufacturer
• Wearing coat shall be done in the spot, with adequate care to ensure a waterproof joint with the existing wearing coat
• Temperature to be checked before installing the elastomeric slab unit

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  Sr No.	Test	Unit	Specification and Testing Method	Specimens
  1	Hardness	IRHD	IS: 3400 (Part II) Cl.5.1.2.2	4.0mm (min ) thickness of Test specimen
  2	Tensile Strength	MPa	IS:3400 ( Part I)	Thick- 2.0 +.0.20mm
  3	Elongation at Break	%	Table 1 Type -1	Width 6.0 + 0.40mm Bench Mark-25..0mm(max)
  4	Adhesion Strength (Metal to Rubber	KN/M	IS:3400 ( Part XIV) Cl.3.3	Length -125mm Width-25mm Width-25mm 1 g (min)
  5	Ash Content	%	IS:3400 (Part XXII)	1 g (min)
  6	Polymer Identification	Chemically	Cl. A-8.3.1 IS	0.5 g (min)
  7	Percentage of Polymers	%	IS	1 g (min)
  8	Compression Set	%	IS: 3400 (Part X) Cl. 5.1	Thick -12.5 + 0.50mm Dia-29 + 0.50mm

                    

Slab Seal Expansion Joint Unitary & The high efficiency, no maintenance, water proof, durable steel reinforced elastomeric slab-seal type expansion joints for bridges was introduced by SANDHYA ENTERPRISES under the brand name of ''SANDHYAFLEX'' in early 2016''s. ''SANDHYAFLEX brand Slab Seal Expansion Joints'' joints are available in different models with movement capacities ranging from 20 mm to 230 mm, which is catered by the shear deformation of elastomeric slab units and thereby provides a smooth riding surface and ensures no damage to the components.

The elastomeric slab units are made from imported chloroprene rubber and are not only abrasion resistant but also particularly suitable to all types of wheel profile. These units are not affected by fuel, oil, salt or grit, heat and direct sunlight, frost, ice and snow. The total length of joint is built up by smaller modules to facilitate very simple and quick fixing and replacement of any particular unit, if at all necessary.1.       Steel structure are to be inserted as shown above in either sides, little lowered position.

2.       Top of the insert shall be at par with finished level of wearing coat to maintain the camber.

3.       Steel structure and main reinforcement bar shall be anchored with proper welding.

4.       If required spacer bar shall be used for proper alignment of bolt 

• The Strip Seal Expansion Joint System consists of a rubber gland, mechanically tightened between two steel edge members and provides a superior watertight proofing system. The design of the DECG Strip Seal System can easily accommodate.
• • The Strip Seal system is a unique concept for effectively sealing expansion joints in bridges and structures with movements up to 125 mm. Single-Seal Expansion Joints are available in different versions for constructive systems exposed to traffic.
  • • They also help extend the life of concrete structures by providing some “give” in the movement of the structure. Expansion joints can be used in parking garages, overpasses, roadways, sidewalks, piping structures and railway tracks.
    • • These Expansion Joints has been engineered so that the neoprene seal can be inserted either prior to or after the securing of the steel shapes to the superstructure. Machined Steel shapes maximize seal insatiability and minimize manufacturing tolerance associated with overall Steel shape manufacture.
      • Type
      • 1 M Type
      • 2 F Type
      • 3 T Type
      • 4 W Type

A slab seal expansion joint, also known as a bridge expansion joint or simply an expansion joint, is a structural element used to allow movement and absorb stresses in large concrete structures, such as bridges, highways, parking garages, and other infrastructure. Concrete structures are subject to temperature variations, moisture changes, and dynamic loads, which can cause them to expand, contract, or shift over time. To accommodate these movements and prevent damage, expansion joints are strategically placed at specific intervals along the length of the structure.

The purpose of slab seal expansion joints is to create a gap between adjacent concrete slabs, which allows for movement without causing cracks or damage to the structure. These joints are typically filled with flexible materials or seals to prevent debris, water, and other harmful substances from penetrating the gap and potentially causing corrosion or deterioration.

The most common types of slab seal expansion joints include:

1. Strip Seal Joints: These consist of a metal strip that spans the gap between the concrete slabs. The strip is usually bolted or fixed to one side of the joint and has a compressible rubber or neoprene insert that fills the gap.

2. Modular Joints: Modular joints are pre-fabricated units that cover the gap between the slabs. They are easy to install and provide a watertight seal.

3. Finger Joints: Finger joints are made up of multiple steel fingers or bars that interlock to accommodate movement. These joints are commonly used in large structures with high movement requirements.

4. Elastomeric Joints: Elastomeric seals are made from high-quality rubber or elastomeric materials that can compress and expand to accommodate movement while maintaining a watertight seal.

Slab seal expansion joints play a critical role in maintaining the longevity and safety of concrete structures by reducing the stresses and preventing the development of cracks that could compromise the integrity of the infrastructure. Proper design, installation, and maintenance of these expansion joints are essential to ensure their effectiveness and longevity.