Minnesota Department of Transportation

511 Travel Info

Concrete Pavement Rehab (CPR)

 

Orange barrels on a highway

Concrete Pavement Rehab

The following photos are images that represent the type of work being done on a Concrete Pavement Rehab Project.

Full Depth Repair

Damaged panel

Removing a damaged panel for new replacement.

Removal of full depth panel

Removal of a full depth panel for repair.

Preparing base for new concrete

Preparing the base for new concrete.

 

Drilling holes for a 1" epoxy dowel bars. These 1" dowel bars tie the existing concrete to the new concrete to keep the panels from vertical movement
Drilling holes for a 1" epoxy dowel bars. These 1" dowel bars tie the existing concrete to the new concrete to keep the panels from vertical movement.
Failed concrete that will need to be removed

Failed concrete that will need to be removed

Partial repair

Partial repairs showing the top half chipped or ground out. This also shows a spot where the deteriation of the old concrete goes to the base. Rebar is drilled and epoxied into the old concrete to help keep the new concrete in place.

 

Dowel bar retrofit

Saw truck cutting slots for dowel bars
Saw truck sawing slots for the Dowel Bar Retrofit. These dowel bar slots are then chipped out to place a 1 1/4 " dowel bar 15" long in the slots. It is then filled with a special high strength concrete mix. This is done at the midpanel cracks in the road to stabilize the panels. The dowels are placed to about half the depth of the concrete. The hose on the truck sucks up the slurry created by the cutting.
Close up view of the slot hole
Close up view showing three slots in the right wheel track.
Slot hole prior ro dowel bar placement
A view of the slot hole prior to the dowel bar being placed.
Two dowel bar slots close to the centerline
Two dowel bar slots close to the centerline.
Close up view
A close up view showing 3 slots in the right wheel track and two in the left wheel track.
Core hole showing crack all the way to the base.This core hole shows a mid-panel crack all the way to the base. It indicate how much deteriation there is in the concrete. This will get a Dowel Bar Retrofit to keep the two panels from shifting and moving vertically.

 

Completed Full Depth Panel and Dowel Bar Retrofit

Completed full depth repair before grinding
View of a completed full depth repair and dowel bar retrofit.

 

Grinding for a smoother ride

Level showing dip in concrete
Image of a dip in the old concrete. When repairs are finished, the road is ground to make for a smoother ride.

Concrete grinder used to level the road
Concrete Grinder used to level the road for a smoother ride.