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Calibration of a stress-strain response for geopolymer concrete under axial compressive load

The use of geopolymer concrete (GPC) in common load-bearing structures is still limited, mainly due to the lack of specific design procedures and limited understanding of the stress–strain behavior under uniaxial loading. The present work investigates the mechanical responses of GPC under axial comp...

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Main Authors: Dong, Van Dao, Hung Viet, Tran, Hai-Bang, Ly, Tien-Thinh Le
Format: Bài trích
Language:English
Published: SAGE Journals 2022
Subjects:
Geopolymer concrete
Stress–strain response
Online Access:https://journals.sagepub.com/doi/10.1177/14644207221075912
https://dlib.phenikaa-uni.edu.vn/handle/PNK/5916
https://doi.org/10.1177/14644207221075912
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spelling oai:localhost:PNK-59162022-08-17T05:54:55Z Calibration of a stress-strain response for geopolymer concrete under axial compressive load Dong, Van Dao Hung Viet, Tran Hai-Bang, Ly Tien-Thinh Le Geopolymer concrete Stress–strain response The use of geopolymer concrete (GPC) in common load-bearing structures is still limited, mainly due to the lack of specific design procedures and limited understanding of the stress–strain behavior under uniaxial loading. The present work investigates the mechanical responses of GPC under axial compressive load by conducting a large number of experiments. For this purpose, 198 samples with three GPC mixes were designed, including concrete grades of 30, 40, and 50 MPa. The samples were prepared following the ASTM standards to determine the stress–strain relationship under compression. The results showed that fly ash-based GPC had average elastic modulus values of 30.424, 31.497, and 33.650 GPa, respectively, for G30, G40, and G50, lower than estimated using formulae for Ordinary Portland Cement (OPC) concrete, such as ACI standard 318-11, AASHTO-2007, and others. Furthermore, a novel model of GPC stress–strain response was proposed, mainly based on the empirical formulation suggested by Sargin using a modified factor D. Besides, the deformation of GPC was observed larger than that of OPC with similar strength, for instance, the strain at peak stress εc=2.45−2.75‰. The GPC was also found to have better plasticity behavior than OPC while conducting the axial stress–strain response, with the obtained values of εcu=3.2−4‰. The findings of this work might lead to additional in-depth research into GPC's mechanical characteristics, particularly its structural behavior. 2022-07-13T01:59:55Z 2022-07-13T01:59:55Z 2022 Bài trích https://journals.sagepub.com/doi/10.1177/14644207221075912 https://dlib.phenikaa-uni.edu.vn/handle/PNK/5916 https://doi.org/10.1177/14644207221075912 en SAGE Journals
institution Digital Phenikaa
collection Digital Phenikaa
language English
topic Geopolymer concrete
Stress–strain response
spellingShingle Geopolymer concrete
Stress–strain response
Dong, Van Dao
Hung Viet, Tran
Hai-Bang, Ly
Tien-Thinh Le
Calibration of a stress-strain response for geopolymer concrete under axial compressive load
description The use of geopolymer concrete (GPC) in common load-bearing structures is still limited, mainly due to the lack of specific design procedures and limited understanding of the stress–strain behavior under uniaxial loading. The present work investigates the mechanical responses of GPC under axial compressive load by conducting a large number of experiments. For this purpose, 198 samples with three GPC mixes were designed, including concrete grades of 30, 40, and 50 MPa. The samples were prepared following the ASTM standards to determine the stress–strain relationship under compression. The results showed that fly ash-based GPC had average elastic modulus values of 30.424, 31.497, and 33.650 GPa, respectively, for G30, G40, and G50, lower than estimated using formulae for Ordinary Portland Cement (OPC) concrete, such as ACI standard 318-11, AASHTO-2007, and others. Furthermore, a novel model of GPC stress–strain response was proposed, mainly based on the empirical formulation suggested by Sargin using a modified factor D. Besides, the deformation of GPC was observed larger than that of OPC with similar strength, for instance, the strain at peak stress εc=2.45−2.75‰. The GPC was also found to have better plasticity behavior than OPC while conducting the axial stress–strain response, with the obtained values of εcu=3.2−4‰. The findings of this work might lead to additional in-depth research into GPC's mechanical characteristics, particularly its structural behavior.
format Bài trích
author Dong, Van Dao
Hung Viet, Tran
Hai-Bang, Ly
Tien-Thinh Le
author_facet Dong, Van Dao
Hung Viet, Tran
Hai-Bang, Ly
Tien-Thinh Le
author_sort Dong, Van Dao
title Calibration of a stress-strain response for geopolymer concrete under axial compressive load
title_short Calibration of a stress-strain response for geopolymer concrete under axial compressive load
title_full Calibration of a stress-strain response for geopolymer concrete under axial compressive load
title_fullStr Calibration of a stress-strain response for geopolymer concrete under axial compressive load
title_full_unstemmed Calibration of a stress-strain response for geopolymer concrete under axial compressive load
title_sort calibration of a stress-strain response for geopolymer concrete under axial compressive load
publisher SAGE Journals
publishDate 2022
url https://journals.sagepub.com/doi/10.1177/14644207221075912
https://dlib.phenikaa-uni.edu.vn/handle/PNK/5916
https://doi.org/10.1177/14644207221075912
_version_ 1751856317647028224
score 8.891145

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