Applications

Tunneling and Mining

Stanford LCLS Tunnel - Stanford University, Menlo Park, CA

High dosages of polypropylene fibers have actually been utilized in shotcrete projects for many years, beginning with the air-placed re-lining for the river wall of the Thames River in England in 1968. More recently, in 1988, 10 lbs. per cubic yard of heavy-duty polypropylene fiber were used on the tunnel wall at the Oldman River Dam in southern Alberta, Canada. In this case, 10.1 lbs. of the FORTA® polypropylene fiber served as a user-friendly and performance-surpassing alternative to the 118 lbs. of steel fiber per cubic yard that had been used to start the project. The synthetic fibers also eliminated any risk of injury from rebounding fibers, and were easy to add, mix, and shoot, without build-up in the mixer trucks or shotcrete lines.

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