UTILIZING GRINDINGS ON RURAL ROADS:

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Presentation transcript:

UTILIZING GRINDINGS ON RURAL ROADS: Converting Gravel Roads to Hard Surface

Smith Loop Before Grindings Application 2 miles of gravel road Approximately 4 inches of gravel Daily traffic count of 100

Bad Grinding Source Quality of Product Source Very Important Be wary of Large alligators F mix road Road that has fabric

Good Grinding Source Quality of the surface that is being torn up will affect the size of the resulting product. Look for Smooth surface Not a lot of patching No fabric Will result in consistent product

Manage Production Rates To control the quality of work: Know your source’s production rate, Know your production rate, Make a plan to control both. e.g. We designate a stockpile site where loads can be staged.

Water is Very Important in the Process: Have a Consistent Source Helps product bind together Helps control fines: brings them to surface Source should be close It will take more than you think

Phase 1: First Grader First pass Works larger grindings toward the center of the road Sets depth of grindings Levels surface Lays out bigger grindings for roller

Larger Grindings Pulled to the Middle of Road

Elliott Grid Roller Breaks larger pieces to finished size Breaks down grindings more consistently than a sheep foot roller 2) Doesn’t leave holes in road surface

Second Grader with a Roller First grader determines depth Second grader shapes road Smooth Roller follows and compacts to grade

Grindings are also used to Build up Intersections and Approaches

Phase 2: Chip Seal Process After final roll, no traffic is allowed on the road until the first lift of chip seal is done.

Double Chip Seal Two options: Two lifts of 3/8” rock (better for high truck traffic) OR One lift of 3/8”, and 1 of ¼” (better for bikes) Shot rate: .40

Phase 3: Fog Seal Final step is the application of a fog seal: Better seal Binding effect

Finished Product 20 Foot Road Surface

Six years later Tight surface Dime

Current Photo No Base Failures

Cost Summary Total Cost: $144,964.00 Base Cost: Material Grindings $10.20/ton for 4044tons $41,251.00 Equipment County $11,043.00 Rental $12,400 Labor County $17,870 Total Base Cost: $82,564.00 Surface Cost: Chip Seal $60,000.00 Fog Seal $2,400.00 Total Surface Cost: $62,400.00 Total Cost: $144,964.00 Roughly $72,482 per mile

Tampico After One Year Traffic count on this road is 250/day

Tampico with 3/8 and ¼ Chip Seal

Any Questions?