Systematic Mix Procedures for Highly Flowable-Strain Hardening Fiber Reinforced Concrete (HF-SHFRC) by Using Tensile Strain Hardening Responses as Performance Criteria

作者：Liao Wen Cheng; Perceka Wisena^*; Yu Li Chen

来源：Science of Advanced Materials, 2017, 9(7): 1157-1168.

DOI：10.1166/sam.2017.3097

• Critical Fiber Volume Fraction
• HF-SHFRC
• HPFRCC
• SCC
• Slump Flow
• Steel Fibers
• Tensile Strain-Hardening

Highly flowable strain hardening fiber reinforced concrete (HF-SHFRC) has good workability in the fresh state, and exhibits tensile strain-hardening and multiple cracking characteristics of high performance fiber reinforced cementitious composites (HPFRCC) in the hardened state. A successful mixture of HF-SHFRC can be easily manufactured and delivered by ready-mix trucks for cast on job sites. However, current mix proportions of HF-SHFRC are still developed with unsystematic trial-and-error procedure by modifying selected self-consolidating concrete (SCC) mixtures. This paper presents a comprehensive performance-based HF-SHFRC mix design methodology for target slump flow and strength based on dense packing concept. Minimum fiber volume fraction to achieve strain hardening is considered in this design procedures. Unlike traditional HPFRCC, coarse aggregate is provided in HF-SHFRC. Slump flow tests, compressive tests and direct tensile tests were carried out to investigate the validity of this mix design for different strength demands (30, 40, 50, 60 MPa). The test results show good agreement with performance targets in terms of flowability, strength and tensile strain hardening characteristics.

• 出版日期2017-7