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A study on fracture toughness of ultra-high toughness geopolymer composites based on Double-K Criterion
https://orcid.org/0000-0002-4605-8422
Highlights An Ultra-high toughness geopolymer composites (UHTGC) were fabricated. Both initial fracture toughness and unstable fracture toughness of UHTGC is improved. The fracture energy of UHTGC is up to 77 times than that of specimens without fiber.
Abstract Ultra-high toughness geopolymer composites (UHTGC) were fabricated based on the matrix of binder composed of alkali-activated fly-ash and granulated blast furnace slag and fiber of polyvinyl alcohol (PVA) in this paper. The tensile behavior and fracture toughness of UHTGC are investigated on both macro and micro scales experimentally and analyzed based on Double-K Criterion. With slag content of 20% and curing temperature ≥60 °C, the average strain of the composite under uniaxial tension load is more than 3% with pseudo-strain hardening behavior and multiple cracking. Both initial fracture toughness and unstable fracture toughness of geopolymer is improved by adding PVA fibers. The fracture energy of UHTGC is up to 77 times of that of mixes without fiber. The results of nanoindentation test verified that the modulus of elasticity increases with curing temperature, while the fracture energy decreases slightly with curing temperature.
A study on fracture toughness of ultra-high toughness geopolymer composites based on Double-K Criterion
https://orcid.org/0000-0002-4605-8422
Highlights An Ultra-high toughness geopolymer composites (UHTGC) were fabricated. Both initial fracture toughness and unstable fracture toughness of UHTGC is improved. The fracture energy of UHTGC is up to 77 times than that of specimens without fiber.
Abstract Ultra-high toughness geopolymer composites (UHTGC) were fabricated based on the matrix of binder composed of alkali-activated fly-ash and granulated blast furnace slag and fiber of polyvinyl alcohol (PVA) in this paper. The tensile behavior and fracture toughness of UHTGC are investigated on both macro and micro scales experimentally and analyzed based on Double-K Criterion. With slag content of 20% and curing temperature ≥60 °C, the average strain of the composite under uniaxial tension load is more than 3% with pseudo-strain hardening behavior and multiple cracking. Both initial fracture toughness and unstable fracture toughness of geopolymer is improved by adding PVA fibers. The fracture energy of UHTGC is up to 77 times of that of mixes without fiber. The results of nanoindentation test verified that the modulus of elasticity increases with curing temperature, while the fracture energy decreases slightly with curing temperature.
A study on fracture toughness of ultra-high toughness geopolymer composites based on Double-K Criterion
https://orcid.org/0000-0002-4605-8422
Highlights An Ultra-high toughness geopolymer composites (UHTGC) were fabricated. Both initial fracture toughness and unstable fracture toughness of UHTGC is improved. The fracture energy of UHTGC is up to 77 times than that of specimens without fiber.
Abstract Ultra-high toughness geopolymer composites (UHTGC) were fabricated based on the matrix of binder composed of alkali-activated fly-ash and granulated blast furnace slag and fiber of polyvinyl alcohol (PVA) in this paper. The tensile behavior and fracture toughness of UHTGC are investigated on both macro and micro scales experimentally and analyzed based on Double-K Criterion. With slag content of 20% and curing temperature ≥60 °C, the average strain of the composite under uniaxial tension load is more than 3% with pseudo-strain hardening behavior and multiple cracking. Both initial fracture toughness and unstable fracture toughness of geopolymer is improved by adding PVA fibers. The fracture energy of UHTGC is up to 77 times of that of mixes without fiber. The results of nanoindentation test verified that the modulus of elasticity increases with curing temperature, while the fracture energy decreases slightly with curing temperature.
A study on fracture toughness of ultra-high toughness geopolymer composites based on Double-K Criterion
Wan, Xiaomei (author) / Shen, Chen (author) / Wang, Penggang (author) / Zhao, Tiejun (author) / Lu, Yu (author)
2020-03-21
Article (Journal)
Electronic Resource
English
| European Patent Office | 2023
| British Library Online Contents | 2012