Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 57, Issue -, Pages 163-168Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2014.02.005
Keywords
Geopolymer; Fly ash; Strain hardening; Fiber reinforced composite; Digital Image Correlation
Categories
Funding
- National Science Foundation [CMMI 1068005]
- Directorate For Engineering [1068005] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn [1068005] Funding Source: National Science Foundation
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Fly ash-based geopolymer has been intensively studied as a promising alternative to ordinary cement materials. While geopolymer concrete has good strength and excellent material greenness, applications have been limited to niche or small scale applications. In order to use geopolymer for large scale structural applications, the inherent brittleness should be addressed. In this study, strain-hardening ductile fiber reinforced geopolymer composites were developed by using randomly oriented short Poly-Vinyl Alcohol (PVA) fibers. Subsequently, their mechanical properties were investigated by cube compressive and dogbone tensile testing. Tensile strain hardening behavior with very high ductility of over 4% was experimentally demonstrated for the developed composites. These performances were found to be further improved by utilizing temperature curing methods. Crack width distributions were also investigated by using the Digital Image Correlation technique. The analysis indicated that the maximum and average crack widths are 117 lam and 45 lam, respectively, even at a high imposed strain level of 4.5%. Therefore, the feasibility of strain-hardening ductile geopolymer composites was established. (C) 2014 Elsevier Ltd. All rights reserved.
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