Channel lining with fiber reinforced shotcrete
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Channel lining with fiber reinforced shotcrete

Filetype[PDF-3.85 MB]


English
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  • Creators:
  • Corporate Creators:
    Arizona Transportation Research Center
  • Corporate Contributors:
  • Subject/TRT Terms:
  • Publication/ Report Number:
  • Resource Type:
    Research Paper
  • Geographical Coverage:
    Arizona
  • TRIS Online Accession Number:
    625332
  • Edition:
    Final report
  • Corporate Publisher:
    Arizona. Dept. of Transportation
  • NTL Classification:
    NTL-HIGHWAY/ROAD TRANSPORTATION-Construction and Maintenance;NTL-HIGHWAY/ROAD TRANSPORTATION-Materials;
  • Abstract:
    The Arizona Department of Transportation (ADOT) has used four brands of discrete synthetic fibers in a drainage outfall channel lining as part of construction project ACI-10-3(270). The use of the fibers was intended to test the constructibility and performance of four commercially available fibers. If the fibers had proven effective, a generic specification for synthetic fiber reinforced shotcrete would have been developed. The drainage outfall channel is 500 ft long and has a 140 ft hydraulic perimeter. Each fiber was placed in a 50 ft long section of the 5 in. thick lining. The construction process was documented with videotape and still photography. Slump measurements were taken before and after addition of fibers. Compressive strength (ASTM C-42), flexural toughness (ASTM C-1018), and percent permeable voids (ASTM C-642) testing were conducted on samples cut from 2 ft x 3 ft panels. Four panels were fabricated during the construction of each of the test sections. Shortly after construction, visible plastic and drying shrinkage cracks were painted. Each test section was subsequently photographed and the lineal feet of cracks were determined. Beam and core samples were extracted from the channel lining after two years of service and compared with panel samples taken at the time of construction and stored for two years. Analysis of variance carried out at the 5% significance level indicates that the addition of fibers had no effect on compressive strength, flexural toughness, or percent permeable voids. The beam samples used in the flexural toughness testing did not indicate any flexural toughness beyond first crack. Crack surveys conducted shortly after construction and again after two years of service indicate that the lining is performing satisfactorily. This project was conducted to test the constructibility and performance of synthetic fibers used at manufacturers recommended dosages (1.6 lbs/cu yd for three of the fibers and 1.0 lb/cu yd for the other fiber). The test results indicate that at the levels of reinforcement used for this project the fibers provide no measurable advantage over plain shotcrete. Therefore no specification was developed as part of this project. /Abstract from report summary page/
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