Tensile behavior of strain-hardening geopolymer composites (SHGC) under impact loading

Trindade, Ana Carolina Constâncio; Heravi, Ali A.; Curosu, Iurie; Liebscher, Marco; Silva, Flávio de Andrade

doi:10.1016/j.cemconcomp.2020.103703

Cited by 60 publications

(30 citation statements)

References 29 publications

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“…Geopolymers exhibit a fragile behavior with low deformation capacity as is typical of ceramics 10 . The use of reinforcements has been well explored in distinct forms to enhance their strength and ductility, such as additions of: sand 10 and chamotte 10‐12 as particulate reinforcements; as well as incorporations of synthetic (PVA, 13 PE, 14 carbon, 15 glass, 16 steel 9 ), mineral (basalt 11,17 ) and natural (bamboo, 18 jute, 8 sisal 19 ) fibers. Basalt fibers appear to be an interesting compatible material to be incorporated into geopolymer binders due to their high tensile strength, alkali resistance, 11 durability, and resistance to elevated temperatures 16 …”

Section: Introductionmentioning

confidence: 99%

Mechanical behavior of K‐geopolymers reinforced with silane‐coated basalt fibers

2020

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Geopolymers are a well-known class of amorphous ceramic materials based on inorganic-polymers with high contents of alumina and silica (made from metakaolin and fumed silica). 1,2 They are manufactured under ambient temperatures through the combination of the aluminosilicate source with an alkali solution, based on Na or K, in a SiO 2 environment. 1,3 During curing in solution, they undergo distinct processes of formation via: (a) dissolution, (b) polycondensation; and (c) precipitation. 3,4 Several designs have been evaluated in the literature, 2,3,5,6 and their main formulation is based on M 2 O•Al 2 O 3 •xSiO 2 •yH 2 O 1,5 ; where M represents the alkali (Na or K); and x and y are determined according to the molar ratios desired. Their applications have been growing in recent years, encompassing different purposes and markets, such as: (a) fire-resistant structures; 3,7 (b) nuclear waste encapsulation 4,7 ; (c) alternatives to cement-based materials. 8,9

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Section: Introductionmentioning

confidence: 99%

Mechanical behavior of K‐geopolymers reinforced with silane‐coated basalt fibers

2020

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“…For future investigations, the micromechanical testing configurations could be adapted for higher displacement rates, such as presented in [35]. In addition, further micromechanical tests with fully embedded fibers could be conducted.…”

Section: Discussionmentioning

confidence: 99%

Computational Micro-Macro Analysis of Impact on Strain-Hardening Cementitious Composites (SHCC) Including Microscopic Inertia

et al. 2020

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This paper presents a numerical two-scale framework for the simulation of fiber reinforced concrete under impact loading. The numerical homogenization framework considers the full balance of linear momentum at the microscale. This allows for the study of microscopic inertia effects affecting the macroscale. After describing the ideas of the dynamic framework and the material models applied at the microscale, the experimental behavior of the fiber and the fiber–matrix bond under varying loading rates are discussed. To capture the most important features, a simplified matrix cracking and a strain rate sensitive fiber pullout model are utilized at the microscale. A split Hopkinson tension bar test is used as an example to present the capabilities of the framework to analyze different sources of dynamic behavior measured at the macroscale. The induced loading wave is studied and the influence of structural inertia on the measured signals within the simulation are verified. Further parameter studies allow the analysis of the macroscopic response resulting from the rate dependent fiber pullout as well as the direct study of the microscale inertia. Even though the material models and the microscale discretization used within this study are simplified, the value of the numerical two-scale framework to study material behavior under impact loading is demonstrated.

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“…By developing more sophisticated material models while conducting further dynamic micromechanical experiments, the predictive capacity of the simulation can be further improved. For future investigations aiming at a more detailed assessment of the developed RVEs, the micromechanical testing configurations will be adapted for higher displacement rates (such as presented in [32]). This will allow for a more realistic assessment of the dynamic fiber tensile strength and fiber-matrix bond strength.…”

Section: Discussionmentioning

confidence: 99%

Computational Micro-Macro Analysis of Impact on Strain-Hardening Cementitious Composites (SHCC) Including Microscopic Inertia

Tamsen

Curosu

Mechtcherine

et al. 2020

Preprint

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This paper presents a numerical two-scale framework for the simulation of fiber reinforced concrete under impact loading. The numerical homogenization framework considers the full balance of linear momentum at the microscale. This allows for the study of microscopic inertia effects affecting the macroscale. After describing the ideas of the dynamic framework and the material models applied at the microscale, the experimental behavior of the fiber and the fiber-matrix bond under varying loading rates are discussed. To capture the most important features, a simplified matrix cracking and a strain rate sensitive fiber pullout model are utilized at the microscale. A split Hopkinson bar tension test is used as an example to present the capabilities of the framework to analyze different sources of dynamic behavior measured at the macroscale. The induced loading wave is studied and the influence of structural inertia on the measured signals within the simulation are verified. Further parameter studies allow the analysis of the macroscopic response resulting from the rate dependent fiber pullout as well as the direct study of the microscale inertia. Even though the material models and the microscale discretization used within this study are still simplified, the value of the numerical two-scale framework to study material behavior under impact loading is shown.

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Tensile behavior of strain-hardening geopolymer composites (SHGC) under impact loading

Cited by 60 publications

References 29 publications

Mechanical behavior of K‐geopolymers reinforced with silane‐coated basalt fibers

Mechanical behavior of K‐geopolymers reinforced with silane‐coated basalt fibers

Computational Micro-Macro Analysis of Impact on Strain-Hardening Cementitious Composites (SHCC) Including Microscopic Inertia

Computational Micro-Macro Analysis of Impact on Strain-Hardening Cementitious Composites (SHCC) Including Microscopic Inertia

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