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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 traffic and vibration place bridges under further stress. As steel reinforcing bars corrode and expand, concrete can crack and deteriorate. The costly disruption caused by the resulting repair work impacts both traffic 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 traffic interruption and demolition. As moisture is the most significant factor in concrete deterioration, incorporating sufficient waterproofing at the design stage is by far the most cost-effective option.
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.
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.
Britdex MDP is a 100% effective seamless bridge deck waterproofing membrane, flexible and tough enough to outlast the design life of many structures.
Comprising rapid-cure, cold-spray applied MMA resin material, the system provides 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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