Bridge Deck Waterproofing

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The need for effective waterproofing solutions

Bridges are under constant stress as water, chlorides, acid rain, de-icing salts and freeze-thaw cycles act on them. Extreme weather cycles, the impact of traffi c and vibration place bridges under further stress. As steel reinforcing bars corrode and expand, concrete can crack and deteriorate. The costly disruption caused by resulting repair work impacts on both traffi c and safety.

Bridge repairs can often amount to 10-30% of the updated construction cost, and large repairs may even exceed this and still be the preferred option when compared to the cost of traffi c interruption and demolition. As moisture is the most signifi cant factor in concrete deterioration, incorporating suffi cient waterproofi ng at the design stage is by far the most cost-effective option.

Product Used: Pitchmastic PmB

PmB is a two part, spray applied, durable corrosion protection and waterproofing material. The high performance system is 100% polyurethane containing no fillers or additives and is VOC free. Once applied, PmB has exceptional bond strength to all commonly used substrates, has excellent crack bridging capability and a life expectancy in excess of 30 years and holds British Board of Agrément approval.

Applications & Performance

  • Widely used across bridges, tunnels, culverts, walkways, as well as plaza decks, balconies, green roofs, and more.
  • Acts as a protective barrier for bridge decks against environmental damage, such as water, de-icing salts, freeze-thaw cycles, and chemical exposure.
  • Recognized by major infrastructure bodies like UK’s Network Rail and London Underground.

Case Study

Orthotropic Steel Deck (OSD) – Atal Setu

The steel Deck is being treated with MMA Technology (uses Methyl Methacrylate resin) for waterproofing and the product used: Britdex MDP Spray applied Waterproofing membrane.

MDP is a 100% effective seamless bridge deck waterproofing membrane, flexible and tough enough to outlast the design life of many structures.

Comprising of rapid cure, cold spray applied MMA resin material, the system for a tough, chemically resistant seamless membrane with no vulnerable joints, Quick and easy sprayable application with rapid cure, excellent crack bridging capability, durable effective protection against corrosion, excellent adhesion to steel etc.

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