Evaluation of the Direct Tensile Behavioral Characteristics of UHPC Using Twisted Steel Fibers

Abstract:

This paper investigates the improvement of the toughness of UHPC through the use of conventional straight steel fibers and twisted fibers. The conventional straight steel fiber has length of 13 mm and diameter of 0.2 mm. Besides, twisted fibers with diameters of 0.2 mm, 0.22 mm and 0.3 mm, respective lengths of 20 mm, 22 mm and 30 mm and made of high elastic steel fibers with aspect ratio (l/d) of 100 are used at volume fractions of 1%, 1.5% and 2%. The results of the examination of the direct tensile behavior reveal the occurrence of strain hardening after early cracking. K-UHPC using twisted fiber exhibits significantly improved mechanical characteristics compared to UHPC using conventional straight fiber. Equivalent or superior performance is developed when small proportion of about 0.5% of steel fiber is adopted and 90% of the performance is developed when small proportion of approximately 1.0% of fiber is admixed. Consequently, the use of twisted fiber in K-UHPC opens the possibility to achieve economically efficient fabrication by enabling significant reduction of the amount of fiber.

• Periodical: Advanced Materials Research (Volumes 602-604)
• Pages: 96-101
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.602-604.96
• Online since: December 2012
• Authors: Gum Sung Ryu, Si Hwan Kim, Gi Hong Ahn, Kyung Taek Koh
• Keywords: Aspect Ratio, Direct Tensile Strength, K-UHPC, Toughness, Twist Steel Fiber

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