fully-grouted repair, ready for diamond grinding

Fully-grouted repair, ready for Diamond Grinding

Partial Depth Repair

Patch Area Primed for TechCrete

Crafco Product TechCrete

Repair area after removal and sandblasting

Partial-Depth Partial-Depth Synthetic Resin PatchSynthetic Resin Patch

Finished Partial-Depth Repair (before diamond grinding)

Conventional Diamond Grinding

Cuts a 10’ – 14’ Flat Surface

From wheels behind the grinding head

To the front wheels

Diamond Grinding Machine

Diamond Grinding

Some asphalt Some asphalt was left in was left in localized low localized low areasareas

Typical Final Surface(no asphalt remaining)

Ride Quality Data 2007 IRI (microsurfacing) = 160.94 in/mi

IRI (after asphalt milling) = 222.80 in/mi

IRI final (after CPR and diamond grinding) = 112.00 inches/mile

Project CostsProject Costs Polyurethane Slab Stabilization:Polyurethane Slab Stabilization:

$4.32 /pound for 150,000 pounds ($648,000)$4.32 /pound for 150,000 pounds ($648,000)

Pre-Cast Panels:Pre-Cast Panels: $472.89/s.y. for 4,900 s.y. ($2,317,161)$472.89/s.y. for 4,900 s.y. ($2,317,161)

Synthetic resin Partial-Depth Repairs:Synthetic resin Partial-Depth Repairs: $1,113.95/s.y. for 490 s.y. ($545,835.50)$1,113.95/s.y. for 490 s.y. ($545,835.50)

Diamond Grinding:Diamond Grinding: $7.63 s.y. for 266,750 s.y. ($1,963,280)$7.63 s.y. for 266,750 s.y. ($1,963,280)

Another Example of “Buried Treasure”:Washington SR 522

2002 WashDOT rehab project

Old overlays and asphalt patches removed

Full-depth PCC repairs of damaged concrete

Replaced widened asphalt lanes with full-depth concrete lanes

Diamond ground entire surfaceProvided final surface texture

Pavement still performing well today

Washington SR 522

Washington SR 522

More Buried Treasure on PA I-80?

Summary

Innovative, cost-effective pavement maintenance and repair solutions are needed in today’s financially challenging times.

Many concrete pavements “buried” under asphalt can be restored cost-effectively.

The RAP removed from overlaid PCCP has value and can help reduce project costs.

AcknowledgmentsAcknowledgments

Dan Frentress, P.E.Dan Frentress, P.E. dfren@wcta.netdfren@wcta.net

International Grooving and Grinding International Grooving and Grinding Association (Association (www.igga.net))

Questions ?

International Grooving and Grinding Associationwww.igga.net

Preparation of Repair Area

Fine-grading Bedding MaterialFine-grading Bedding Material

Compaction of Bedding Compaction of Bedding MaterialMaterial