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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, Tran, Hung Viet, Ly, Hai-Bang, Le, Tien Thinh
Format:	Bài trích
Language:	English
Published:	Institution of Mechanical Engineers 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/5773 https://doi.org/10.1177%2F14644207221075912
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spelling	oai:localhost:PNK-57732022-08-17T05:54:54Z Calibration of a stress-strain response for geopolymer concrete under axial compressive load Dong, Van Dao Tran, Hung Viet Ly, Hai-Bang Le, Tien Thinh 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 2022-05-05T07:26:23Z 2022-05-05T07:26:23Z 2022 Bài trích https://journals.sagepub.com/doi/10.1177/14644207221075912 https://dlib.phenikaa-uni.edu.vn/handle/PNK/5773 https://doi.org/10.1177%2F14644207221075912 en Institution of Mechanical Engineers
institution	Digital Phenikaa
collection	Digital Phenikaa
language	English
topic	Geopolymer concrete Stress–strain response
spellingShingle	Geopolymer concrete Stress–strain response Dong, Van Dao Tran, Hung Viet Ly, Hai-Bang Le, Tien Thinh 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 Tran, Hung Viet Ly, Hai-Bang Le, Tien Thinh
author_facet	Dong, Van Dao Tran, Hung Viet Ly, Hai-Bang Le, Tien Thinh
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	Institution of Mechanical Engineers
publishDate	2022
url	https://journals.sagepub.com/doi/10.1177/14644207221075912 https://dlib.phenikaa-uni.edu.vn/handle/PNK/5773 https://doi.org/10.1177%2F14644207221075912
_version_	1751856315219574784
score	8.881002

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

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