Journal
CERAMICS INTERNATIONAL
Volume 43, Issue 17, Pages 15616-15625Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2017.08.118
Keywords
Strain hardening geopolymer composite (SHGC); Geopolymer; Fly ash; Type of activator; Fiber-matrix interface; Micromechanics
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Funding
- Swinburne University of Technology
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This study reports the microscale investigation of a short fiber-reinforced fly ash-based strain-hardening geopolymer composite (SHGC), which possesses high tensile strength (4.7 MPa) and very high tensile strain capacity (4.3%). The investigation involved determination of the quantitative influences of the type of activator, water to geopolymer solids ratio and fiber surface oil coating on the microscale fiber-matrix interface properties using single-fiber pullout tests. The effects of the measured interface properties on the crack bridging cr(8) relation of the composites were investigated using a micromechanics-based model to explain the experimentally observed macroscopic tensile ductility of the composites. The computed 0(6) relation of fly ash-based SHGCs satisfied the necessary micromechanics-based conditions of steady-state flat crack propagation, which result in strain-hardening behavior. This research provides an in-depth understanding of fundamental fiber-matrix interaction properties and mechanisms, and their consequent effects on crack-bridging and tensile performance of the developed fly ash-based SHGCs. This understanding presents the rational basis for design of such cement less composites.
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