A Study on Mix Design and Mechanical Behavior of Highly Flowable Strain Hardening Steel Fiber Reinforced Concrete
Date Issued
2012
Date
2012
Author(s)
Kao, Wei-Yuan
Abstract
This study aims to develop a comprehensive mix design process for highly flowable strain hardening fiber reinforced concrete (HF-SHFRC). The proposed method is developed based on mix design concept of self-compacting concrete (SCC), dense packing theory, and critical volume fraction of fibers of high performance fiber reinforced cementitious composites (HPFRCC). The HF-SHFRC has good workability in the fresh state similar to SCC and exhibits the strain-hardening and multiple cracking characteristics of HPFRCC under tensile forces in the hardened state. In order to achieve the tensile strain-hardening, this study applies the calculation formula of critical volume fraction of fibers. Moreover, the slump flow prediction model is also applied to design HT-SHFRC mixtures for target flowability.
By following mix design process proposed by this study, mixtures of different compressive strength targets (from 30 to 60 MPa) have been successfully developed. The slum flow test results show excellent flowability (slump flow more than 500mm) even with addition of steel hooked fiber of 1.5% volume fraction. In terms of mechanical properties, results of direct tensile tests show that all mixtures satisfy the strain-hardening characteristics of HPFRCC while maintaining 80% of maximum tensile stress capacities up to 0.5% tensile strains. To sum up, the test results show good agreement with performance targets in terms of flowability, strength and tensile strain hardening characteristics.
Subjects
Strain Hardening
SCC
FRC
HPFRCC
Mix Design
Hooked Steel Fibers
SDGs
Type
thesis
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