In road construction, Expansion Joint Filler Boards are critical materials used to accommodate the natural movement of concrete slabs due to thermal expansion, contraction, and other stresses. Here's a breakdown of what they are, why they matter, and the types typically used:
An expansion joint filler board is a compressible sheet material placed between concrete slabs or between concrete and fixed structures to absorb movement and prevent cracking.
Thermal Movement: Concrete expands in hot weather and contracts in cold.
Prevents Cracking: Without joints, slabs might push against each other and crack.
Separation: Provides a buffer between concrete and other structures (like bridges, buildings, or manholes).
Bitumen-impregnated fiberboard:
Traditional material
Water-resistant, compressible, durable
Closed-cell polyethylene foam (e.g., EVA foam):
Lightweight
Flexible and easy to install
Cork filler boards:
High compressibility
Eco-friendly option
Rubber or neoprene:
Used in high-performance areas (like airport runways)
Placed vertically between slabs before the concrete pour.
Must align with the joint and extend the full depth of the slab.
Sealed on top with a sealant to prevent water and debris infiltration.
Thickness: 10 mm, 12 mm, 20 mm
Height: Matches the slab depth (e.g., 150 mm to 300 mm)
Length: Usually comes in 1 or 2 meter lengths
If you're working on or specifying for a road construction project, I can help you choose the right type of filler board based on traffic load, climate, and other specs. Want to dive into standards or pricing in your area?
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