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Why do you require expansion joints for your concrete structures?


Concrete will expand and contract on-site during thermal cycles and between static and dynamic movements so each concrete element does not crack.

At United Trade, we are qualified professionals in expansion joint repair. We offer a variety of Structural and expansion joint repair solutions for perished or damaged joints and cracks.

Our repair systems are chemical-resistant and will alleviate water egress and ingress, whilst allowing the expansion to accommodate movement.

Our engineers will specify where to place expansion joints to enable sections to move independently and to reduce cracking in structures.

All expansion joints in concrete structures, existing or new construction, must be sealed to control moisture migration, corrosion at exposed reinforcing steel, and protect the integrity of the concrete joint.

To ensure all joint material stays bonded, the inside concrete surface of a joint (nosing) must be clean and dry, without voids, cracks, or spalls. These conditions must be repaired before installing any sealant material. Compatible primers are applied to the concrete joint interface before installing polyurethane sealant and pre-molded extruded neoprene rubber materials. The cellular backer rod must be installed to control the proper depth of polyurethane and silicone sealant. This also prevents a three-sided bond. Non-sag sealants must be “tooled” to the bond sealant to joint edges and control the depth of sealant at the center of the joint

Expansion joint systems can be used on many structures such as:

  • Service reservoirs
  • Tunnels
  • Power stations
  • Water and wastewater treatment plants
  • Culverts
  • Silos
  • Water towers
  • Roof connections

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