Masonry Magazine December 1999 Page. 48
Arizona Highway 87
Continued from page 47
soil nails are usually bolts that can go into the soil or rock up to a depth of 3 feet (0.9 m).
A 12-inch (7.6 cm) coat of shotcrete is then pumped onto the wire mesh at the rate of 60 to 70 cubic yards (46 to 54 m3) a day. The shotcrete mix used is 4,000 pound strength, specified by Arizona Department of Transportation (ADOT), but there are no special additives required.
Garner said they primarily use a Putzmeister Katt-Kreter pump, but they occasionally switch to the smaller Putzmeister Thom-Katt TS 2040 trailer pump.
Even though the shotcrete is pre-colored a reddish brown to match the rock, ADOT wanted it to look authentic. "We carve it using knives and trowels to give it the appearance of a natural rock surface," she said.
While it takes only a crew of six to apply the shotcrete, it takes 12 people to carve it. "They have to do it when it's still moist and workable," said Garner, "and then still work fairly fast before the mixture sets." Shotcrete Specialties hopes to complete the enormous shotcrete job in November. ADOT said the entire divided four-lane highway project would be completed in the spring of 2001.
Customer: Arizona Department of Transportation
General contractor: Joint venture between Meadow Valley Contracting, Phoenix, and R.E. Monks Construction Company, Fountain Hills, AZ.
Subcontractor: Shotcrete Specialties, Gilbert, AZ
Equipment: Putzmeister Katt-Kreter, Thom-Katt TS 2040
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