Paragon 1-1/2in Dowel Bar Chair (Carton of 500)

1-1/2in Dowel Bar Chair (500/Ct)

The 1-1/2 inch Dowel Bar Chair is an essential component for concrete dowel bar retrofit applications. These chairs are engineered to securely hold dowel bars at the correct height and alignment within concrete slabs, ensuring proper load transfer across joints and preventing differential settlement. Sold in cartons of 500, these durable chairs are ideal for large-scale highway, runway, and pavement repair projects.

What is a Dowel Bar Retrofit? Over time, concrete pavement slabs can shift and settle, leading to uneven surfaces and rough rides. A dowel bar retrofit is a proven method for restoring the structural integrity of these pavements. Many states are now adopting this technique to extend the life of older highways, making it a more durable and cost-effective solution than a simple asphalt overlay.

The Dowel Bar Retrofit Process: The retrofit process is systematic and precise:

1. Slot Cutting: Six slots, typically three in each wheel path, are cut across transverse joints or cracks using ganged diamond saws.
2. Concrete Removal: The concrete within these cuts is carefully removed using lightweight jackhammers to avoid damaging the surrounding slab.
3. Dowel Placement: Epoxy-coated dowel bars are placed into the slots, supported by Dowel Bar Chairs to ensure they remain at the mid-depth of the slab.
4. Grouting: The slots are filled with a high-strength, non-shrink grout, locking the dowel bars in place.
5. Joint Sealing: The original joints or cracks are sealed with waterproof caulk to prevent moisture intrusion.
6. Diamond Grinding: Finally, the surface is diamond-ground to eliminate any excess grout and ensure a perfectly smooth, level driving surface.

Benefits of Dowel Bar Retrofitting:

• Increased Longevity: Pavements retrofitted with dowel bars are proven to outlast traditional asphalt overlays by at least ten years.
• Improved Ride Quality: By effectively transferring loads between slabs, retrofitting eliminates bumps and dips, significantly improving ride comfort and safety.
• Reduced Maintenance: While initial grinding is needed, the structural stability provided by the dowel bars greatly increases the time between required maintenance, reducing long-term costs.