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Title: Development of Ultra-High-Performance Hybrid Fiber-Reinforced Cement-Based Composites (with Appendix)

Author(s): Sukmin Kwon, Tomoya Nishiwaki, Takatsune Kikuta, and Hirozo Mihashi

Publication: Materials Journal

Volume: 111

Issue: 3

Appears on pages(s): 309-318

Keywords: energy-absorption capacity; hybrid; hybrid fiber-reinforced cement-based composite; macrofiber; microfiber; tensile-strain capacity; tensile strength

DOI: 10.14359/51686890

Date: 5/1/2014

Abstract:
A new ultra-high-performance hybrid fiber-reinforced cement-based composite (UHP-HFRCC) was developed in this study. The UHP-HFRCC exhibited a tensile strength of 20.1 MPa (2.9 ksi), a strain capacity of 1.06%, and energy absorption capacity of 153 kJ/m3 (1356 lb-ft/ft3). The multi-scale fiber reinforcement system employed herein effectively improves the mechanical properties of the UHP-HFRCCs under tension. Determining the appropriate volume fraction of the longer fibers is crucial for enhancing a variety of mechanical properties, including the tensile strength, strain capacity, and energy-absorption capacity. Besides the significant improvement in the mechanical properties of UHP-HFRCC, the cost was reduced, and the workability of the material was improved by using relatively low-volume fractions of fibers (total volume fraction = 2.5 to 3%).