Influence of Aspect Ratio of Macro Synthetic Fiber on Mechanical Properties of Shotcrete

Abstract:

Influences of moisture content and loading rate on flexural toughness were experimentally studied for fiber reinforced shotcrete (FRSC) with steel fiber or macro synthetic polypropylene fiber. According to the four-point bending test method specified in ASTM C1609 and Chinese standard CECS 13, the flexural toughness of specimens after drying for 0h, 16h, 24h and 72h in condition of (20±2)°C and (60±5)% relative humidity was tested at a loading rate of 0.05 mm/min. For specimens after drying for 24h and 72h, flexural toughness was tested at loading rates of 0.05 mm/min, 0.10 mm/min, and 0.20 mm/min respectively. With the moisture content decreasing, the flexural toughness T100,2.0, first-peak flexural strength, and residual flexural strength at prescribed deflections of FRSC exhibited decreasing tendency. The specimens with 0.5 vol% of steel fiber showed higher T100,2.0 value than that with 0.9 vol% of macro synthetic fiber. The residual strength and flexural toughness of FRSC increased with the increase of loading rate.

• Periodical: Advanced Materials Research (Volumes 652-654)
• Pages: 1226-1232
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.652-654.1226
• Online since: January 2013
• Authors: An Shuang Su, Yue Bo Cai
• Keywords: Aspect Ratio, Flexural Toughness, Macro Synthetic Fiber, Mechanical Property, Shotcrete

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