Influence of fiber size on mechanical properties of strain-hardening fiber-reinforced concrete

  • Duy-Liem Nguyen Faculty of Civil Engineering, Ho Chi Minh City University of Technology and Education, 01 Vo Van Ngan street, Thu Duc district, Ho Chi Minh city, Vietnam
  • Thac-Quang Nguyen Faculty of Civil Engineering, Campus in Ho Chi Minh City, University of Transport and Communications, No. 450-451 Le Van Viet street, District 9, Ho Chi Minh city, Vietnam
  • Huynh-Tan-Tai Nguyen Faculty of Civil Engineering, Ho Chi Minh City University of Technology and Education, 01 Vo Van Ngan street, Thu Duc district, Ho Chi Minh city, Vietnam

Abstract

This research deals with the influences of macro, meso and micro steel-smooth fibers on tensile and compressive properties of strain-hardening fiber-reinforced concretes (SFCs). The different sizes, indicated by length/diameter ratio, of steel-smooth fiber added in plain matrix (Pl) were as follows: 30/0.3 for the macro (Ma), 19/0.2 for the meso (Me) and 13/0.2 for the micro fiber (Mi). All SFCs were used the same fiber volume fraction of 1.5%. The compressive specimen was cylinder-shaped with diameter × height of 150 × 200 mm, the tensile specimen was bell-shaped with effective dimensions of 25 × 50 × 100 mm (thickness × width × gauge length). Although the adding fibers in plain matrix of SFCs produced the tensile strain-hardening behaviors accompanied by multiple micro-cracks, the significances in enhancing different mechanical properties of the SFCs were different. Firstly, under both tension and compression, the macro fibers produced the best performance in terms of strength, strain capacity and toughness whereas the micro produced the worst of them. Secondly, the adding fibers in plain matrix produced more favorable influences on tensile properties than compressive properties. Thirdly, the most sensitive parameter was observed to be the tensile toughness. Finally, the correlation between tensile strength and compressive strength of the studied SFCs were also reported.

Keywords:

aspect ratio; strain-hardening; post-cracking; ductility; fiber size.

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Published
19-08-2020
How to Cite
Nguyen, D.-L., Nguyen, T.-Q., & Nguyen, H.-T.-T. (2020). Influence of fiber size on mechanical properties of strain-hardening fiber-reinforced concrete. Journal of Science and Technology in Civil Engineering (STCE) - NUCE, 14(3), 84-95. https://doi.org/10.31814/stce.nuce2020-14(3)-08
Section
Research Papers