STEEL FIBROUS SHOTCRETE

THE LARGEST CONTRACT EVER AWARDED FOR THE APPLICATION OF STEEL FIBROUS SHOTCRETE WAS RECENTLY COMPLETED NEAR PENAWAWA IN WHITMAN COUNTY-WASHINGTON, BY CORAL CORPORATION OF GLADSTANE, OREGON. THE FIBROUS CONCRETE WAS USED TO STABILIZE A SECTION OF RELOCATED CAMAS PRAIRIE RAILROAD TRACK THAT HAS BEEN THREATENED BY FALLING ROCK FROM AN ADJACENT BASALT CUT FOR THE PAST 5 YEARS. COMPOSITION OF THE SHOTCRETE MIXTURE USED WAS PORTLAND CEMENT, WATER, FINE AGGREGATE, STEEL WIRE REINFORCEMENT, AND ACCELERATOR ADMIXTURE. BEFORE THE SHOTCRETE WAS APPLIED HOLES WERE DRI-LED INTO THE SLOPE WITH A PNEUMATIC DRILL FOR 114 ROCK BOLTS. AFTER THE BOLTS WERE IN PLACE, STRESSED AND GROUTED, THE FIBROUS CONCRETE WAS, SHOT ONTO THE SLOPE WITH A REED GUNCRETE MACHINE TO WHICH THE CONTRACTOR MADE SEVERAL MODIFICATIONS. THE MODIFICATIONS WERE MADE PRIMARILY TO PREVENT "BALLING" AS THE MIX WAS DIRECTED INTO THE GUNCRETE HAPPER. THE RESULTING PRODUCTION FIGURES WERE APPROXIMATELY 10 CUBIC YARDS PER HOUR, ALMOST 8 CUBIC YARDS PER HOUR BETTER THAN PREVIOUS EXPERIENCES WITH FIBROUS SHOTCRETE. APPLICATION BEGAN AT THE BOTTOM OF THE SLOPE AND PROGRESSED UPWARD A SEGMENT AT A TIME IN PLANNED SEQUENCE.

• Authors:
  • Kaden, R A
• Publication Date: 1974-4

Media Info

• Features: Photos;
• Pagination: 3 p.
• Serial:
  • Western Construction
  • Volume: 49
  • Issue Number: 4
  • Publisher: King Publications

Subject/Index Terms

• TRT Terms: Basalt; Construction; Excavations; Fiber reinforced concrete; Material reinforcement; Portland cement; Rockbolts; Shotcrete; Slope stability; Slopes; Soil stabilization; Specifications
• Uncontrolled Terms: Construction specifications
• Subject Areas: Construction; Geotechnology; Highways;

Filing Info

• Accession Number: 00215716
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 5 1974 12:00AM