Fabric name: Mirafi
Fabric producer: TenCate Geosynthetics
Fabric supplier: TenCate Geosynthetics
Engineer: Federal Highways Western Federal Lands
Design: Robert Kraig, P.E.
Fabrication: TenCate Geosynthetics
Project manager: Jim Carpita, P.E.
Installation: Beaverhead County Roads Department
Location: 45.50114,-113.104522 near Dillon, MT
Please describe the project specifications.
From top down, the plan call outs, “4” Hot asphalt concrete pavement, 8” Roadway aggregate, Earthwork geotextile, type III-A, Mirafi® RS280i, 10” Select borrow, Earthwork geotextile, type I-A, Mirafi® H2Ri”
What was the purpose of this project? What did the client request?
The client needed to mitigate frost heaves and cracking. Seasonal maintenance was required as the longitudinal cracks were a safety issue.
What is unique or complex about the project?
A traditional reconstruction was conducted in 2004 using sub drains, some PET reinforcement and AASHTO subgrade geotextiles. Frost Heaves were not mitigated and the seasonal longitudinal cracks returned causing continued maintenance and repairs. Designers from Federal Highways were interested in the wicking geosynthetic’s ability to mitigate frost heave. Challenges in the design included the placement of the wicking geosynthetic above the high water line, so a thin design was required to include a base reinforcement layer of high performance geosynthetics (Mirafi® RS280i).
What were the results of the project?
Two full seasons have transpired with absolutely no cracking or heaving. Water can be seen heavily wicking through the rip-rap during the spring freeze-thaw season. The county engineer is extremely satisfied with the performance and wishes the reconstruction had extended farther in both directions, however funding prevented that. Road cracking can be seen on both ends of the project and stop abruptly at the new section. They plan on recommending this solution using Mirafi® H2Ri wicking geosynthetic on the next road repairs.
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