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Ultra-ductile behavior of fly ash-based engineered geopolymer composites with a tensile strain capacity up to 13.7%
Abstract This study introduces ultra-ductile fly ash-based engineered geopolymer composites (UD-EGCs). Four mixtures of UD-EGCs with different ratios of sodium metasilicate pentahydrate (SMP)-to-sodium hydroxide (SH) were designed and prepared at an identical water-to-binder ratio. Polyethylene (PE) fibers at 1.75 vol% were used as reinforcements. Experimental and analytical investigations of mechanical properties, micromechanical analysis, and chemical characterization of UD-EGCs were performed at both meso- and micro-scales. The UD-EGC mixtures were found to strain-harden with ultra-high ductility. Notably, the mixture using an SMP/SH ratio of 1.5 achieved a tensile strain capacity of 13.7% and a tensile strength of 6.8 MPa. Moreover, all mixtures were lightweight, with density below 1.83 g/cm3. From the chemical analysis, C-(N)-A-S-H and N-A-S-H were verified as the primary geopolymeric products of fly ash-based engineered geopolymer composites.
Highlights Fly ash-based engineered geopolymer composites (EGC) were developed with ultra-high ductility. The tensile strain capacity of up to 13.7%, over 1000 times that of normal concrete, was achieved in the developed EGC. The EGC developed exhibited low density below 1.83 g/cm3. Chemical analyses revealed C-(N)-A-S-H and N-A-S-H as primary geopolymeric products.
Ultra-ductile behavior of fly ash-based engineered geopolymer composites with a tensile strain capacity up to 13.7%
Abstract This study introduces ultra-ductile fly ash-based engineered geopolymer composites (UD-EGCs). Four mixtures of UD-EGCs with different ratios of sodium metasilicate pentahydrate (SMP)-to-sodium hydroxide (SH) were designed and prepared at an identical water-to-binder ratio. Polyethylene (PE) fibers at 1.75 vol% were used as reinforcements. Experimental and analytical investigations of mechanical properties, micromechanical analysis, and chemical characterization of UD-EGCs were performed at both meso- and micro-scales. The UD-EGC mixtures were found to strain-harden with ultra-high ductility. Notably, the mixture using an SMP/SH ratio of 1.5 achieved a tensile strain capacity of 13.7% and a tensile strength of 6.8 MPa. Moreover, all mixtures were lightweight, with density below 1.83 g/cm3. From the chemical analysis, C-(N)-A-S-H and N-A-S-H were verified as the primary geopolymeric products of fly ash-based engineered geopolymer composites.
Highlights Fly ash-based engineered geopolymer composites (EGC) were developed with ultra-high ductility. The tensile strain capacity of up to 13.7%, over 1000 times that of normal concrete, was achieved in the developed EGC. The EGC developed exhibited low density below 1.83 g/cm3. Chemical analyses revealed C-(N)-A-S-H and N-A-S-H as primary geopolymeric products.
Ultra-ductile behavior of fly ash-based engineered geopolymer composites with a tensile strain capacity up to 13.7%
Nguyễn, Huy Hoàng (Autor:in) / Lương, Quang-Hiếu (Autor:in) / Choi, Jeong-Il (Autor:in) / Ranade, Ravi (Autor:in) / Li, Victor C. (Autor:in) / Lee, Bang Yeon (Autor:in)
02.06.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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