Abstract
This paper summarizes recent advances in strain-hardening ultra-high-performance concretes (UHPC) with synthetic fibers, with emphasis on their tensile properties. The composites described here usually contain about 2.0% high-density polyethylene (PE) fibers. Compared to UHPC with steel fibers, strain-hardening UHPC with synthetic fibers generally show a higher tensile ductility, lower modulus in the cracked state, and relatively lower compressive strength. The tensile strain capacity of strain-hardening UHPC with synthetic fibers increases with increasing tensile strength. The f’c ft εt/w index (compressive strength × tensile strength × tensile strain capacity/tensile crack width) is used to compare the overall performance of strain-hardening UHPC. Moreover, a probabilistic approach is applied to model the crack width distributions of strain-hardening UHPC, and estimate the critical tensile strain in practical applications, given a specific crack width limit and cumulative probability. Recent development on strain-hardening UHPC with the use of seawater, sea-sand and PE fibers are also presented.
Original language | English (US) |
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Article number | 283 |
Journal | Journal of Composites Science |
Volume | 5 |
Issue number | 10 |
DOIs | |
State | Published - Oct 2021 |
Funding
This study was supported by the Hong Kong Research Grants Council—Theme-based Research Scheme (Project No.: T22-502/18-R), the Research Institute for Sustainable Urban Development, The Hong Kong Polytechnic University (Project No. 1-BBWE), and the Hong Kong Innovation and Technology Fund through the Research Talent Hub (Project No. ITS/077/18FX).
Keywords
- Polyethylene fiber
- Strain-hardening cementitious composites (SHCC)
- Synthetic fiber
- Tensile behavior
- Ultra-high-performance concrete (UHPC)
ASJC Scopus subject areas
- Ceramics and Composites
- Engineering (miscellaneous)