Bridges and highways are the lifelines of our transportation system. But beneath the concrete and asphalt, there's an essential layer of defense: waterproofing membranes.
Waterproofing membranes play a crucial role in our highway infrastructure by serving as a protective barrier against moisture infiltration and other environmental threats. Waterproofing membranes combat long-term, eroding damage to bridge decks.
These membranes are intended to provide extended protection, with asphalt coverings taking the bulk of surface damage as they are easily replaceable (when done properly with great care taken towards preserving the integrity of the underlying membrane).
Related Article: Proper Waterproof Membrane Application Tips
Why Use Waterproof Membranes? Main Benefits:
Their primary purposes include:
- Preventing Water Intrusion: The most fundamental purpose of waterproofing membranes is to keep water from seeping into the structure's underlying components, such as concrete or steel. Water infiltration can lead to corrosion, freeze-thaw damage, and the weakening of the infrastructure over time.
- Increasing Longevity: By creating a waterproof barrier, these membranes extend the lifespan of bridges and highways. They shield the structural elements from the damaging effects of moisture, helping to prevent costly and premature repairs or replacements.
- Reducing Maintenance Costs: Waterproofing membranes help minimize the need for maintenance and repairs. They keep water away from the internal components, reducing the likelihood of damage, cracks, and deterioration, which can be expensive to fix.
- Enhancing Safety: Water intrusion can lead to slippery surfaces, especially in colder climates where freeze-thaw cycles occur. Waterproofing membranes help maintain a safer road surface by reducing the risk of ice formation.
- Protecting Reinforcement: Many highway structures contain reinforcing steel bars (rebar) that provide strength. Waterproofing membranes shield these bars from corrosion, which can compromise the structural integrity of the road or bridge.
- Preserving Aesthetics: Water can cause staining and deterioration of the visible surfaces of bridges and highways. Waterproofing membranes help maintain the appearance and aesthetics of these structures.
Now, let's discuss repairing waterproofing membranes in the bridge and highway industry.
Related Case Study: Waterproof Membrane Application for Pennsylvania DOT
How to Patch Waterproof Membranes
Please refer to our video for detailed instructions. For your benefit, we've bulleted the essential steps below.
- If debris becomes trapped under the membrane, it must be removed to prevent potential puncturing of the membrane when the asphalt overlay is placed.
- Remove the debris by making a “C” shaped cut around the foreign object creating a flap.
- Peel back the membrane, remove the debris; then flip the flap created back into place.
- Cut a 6” (152.4mm) by 6” (152.4mm) patch of fresh membrane to cover the area.
- Center the patch over the cut and heat seal into place.
- Similarly, any issues (cuts, nicks, gouges, rips, tears, etc.) can be repaired using the same procedure
It is always recommended to inspect the installed waterproofing membrane for damage before continuing with paving overlay placement or structure backfill.
In summary, waterproofing membranes are essential in the highway industry to protect infrastructure, increase its longevity, reduce maintenance costs, enhance safety, and preserve both structural integrity and aesthetics. They are a critical component in ensuring the durability and functionality of roads and bridges.
If you're interested in learning more about waterproof membranes and how they factor into your specific operation, leave a comment below or press the contact us button to get in touch with a specialist.