Comparison of axial behavior of RC columns using alkali-activated slag-based concrete and OPC concrete during and after fire

As no study on fire behavior of RC columns using alkali-activated concrete has been reported so far, this paper presents an experimental program comparatively investigating the thermal response and structural behavior of reinforced columns using alkali-activated slag-based concrete (AAC) and Portlan...

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Main Authors: Liu, Yuzhong, Tan, Kang Hai, Du, Yunxing, Su, Jie, Hu, Xiang, Mao, Yuguang, Shi, Caijun
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2023
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Online Access:https://hdl.handle.net/10356/171266
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1712662023-10-18T02:18:30Z Comparison of axial behavior of RC columns using alkali-activated slag-based concrete and OPC concrete during and after fire Liu, Yuzhong Tan, Kang Hai Du, Yunxing Su, Jie Hu, Xiang Mao, Yuguang Shi, Caijun School of Civil and Environmental Engineering Engineering::Civil engineering Axial Capacity Fire Test As no study on fire behavior of RC columns using alkali-activated concrete has been reported so far, this paper presents an experimental program comparatively investigating the thermal response and structural behavior of reinforced columns using alkali-activated slag-based concrete (AAC) and Portland cement-based concrete (PCC) during and after subjecting to the standard fire curve, with concrete strength and fire duration as test parameters. The experimental and analytical studies showed that compared with PCC columns, AAC columns had slightly lower temperature field but faster increase of axial deformation during fire. AAC and PCC columns using normal-strength concrete had equivalent residual axial capacity after exposure to fire. However, AAC columns using high-strength concrete retained greater load-bearing capacity than their PCC counterparts due to the spalling of high-strength PCC columns. AAC columns had lower axial stiffness than PCC columns at ambient temperature due to lower elastic modulus of AAC, but they had similar axial stiffness after exposure to fire of 2 h since PCC underwent more degradation of elastic modulus under high temperature. Furthermore, as concrete strength and fire duration increased, the axial contraction under heating and axial capacity loss after heating of AAC columns increased. A numerical method based on finite difference was used to predict the temperature field and corresponding residual axial capacity of RC columns after the fire. This work was financially supported by the CSCEC Key Laboratory of Civil Engineering Materials (CSCEC-PT-002), the National Natural Science Foundation of China (Grant No. 51638008), and the China Scholarship Council (Grant No. 202106130066). 2023-10-18T02:18:30Z 2023-10-18T02:18:30Z 2023 Journal Article Liu, Y., Tan, K. H., Du, Y., Su, J., Hu, X., Mao, Y. & Shi, C. (2023). Comparison of axial behavior of RC columns using alkali-activated slag-based concrete and OPC concrete during and after fire. Journal of Building Engineering, 77, 107444-. https://dx.doi.org/10.1016/j.jobe.2023.107444 2352-7102 https://hdl.handle.net/10356/171266 10.1016/j.jobe.2023.107444 2-s2.0-85165938956 77 107444 en Journal of Building Engineering © 2023 Elsevier Ltd. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Civil engineering
Axial Capacity
Fire Test
spellingShingle Engineering::Civil engineering
Axial Capacity
Fire Test
Liu, Yuzhong
Tan, Kang Hai
Du, Yunxing
Su, Jie
Hu, Xiang
Mao, Yuguang
Shi, Caijun
Comparison of axial behavior of RC columns using alkali-activated slag-based concrete and OPC concrete during and after fire
description As no study on fire behavior of RC columns using alkali-activated concrete has been reported so far, this paper presents an experimental program comparatively investigating the thermal response and structural behavior of reinforced columns using alkali-activated slag-based concrete (AAC) and Portland cement-based concrete (PCC) during and after subjecting to the standard fire curve, with concrete strength and fire duration as test parameters. The experimental and analytical studies showed that compared with PCC columns, AAC columns had slightly lower temperature field but faster increase of axial deformation during fire. AAC and PCC columns using normal-strength concrete had equivalent residual axial capacity after exposure to fire. However, AAC columns using high-strength concrete retained greater load-bearing capacity than their PCC counterparts due to the spalling of high-strength PCC columns. AAC columns had lower axial stiffness than PCC columns at ambient temperature due to lower elastic modulus of AAC, but they had similar axial stiffness after exposure to fire of 2 h since PCC underwent more degradation of elastic modulus under high temperature. Furthermore, as concrete strength and fire duration increased, the axial contraction under heating and axial capacity loss after heating of AAC columns increased. A numerical method based on finite difference was used to predict the temperature field and corresponding residual axial capacity of RC columns after the fire.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Liu, Yuzhong
Tan, Kang Hai
Du, Yunxing
Su, Jie
Hu, Xiang
Mao, Yuguang
Shi, Caijun
format Article
author Liu, Yuzhong
Tan, Kang Hai
Du, Yunxing
Su, Jie
Hu, Xiang
Mao, Yuguang
Shi, Caijun
author_sort Liu, Yuzhong
title Comparison of axial behavior of RC columns using alkali-activated slag-based concrete and OPC concrete during and after fire
title_short Comparison of axial behavior of RC columns using alkali-activated slag-based concrete and OPC concrete during and after fire
title_full Comparison of axial behavior of RC columns using alkali-activated slag-based concrete and OPC concrete during and after fire
title_fullStr Comparison of axial behavior of RC columns using alkali-activated slag-based concrete and OPC concrete during and after fire
title_full_unstemmed Comparison of axial behavior of RC columns using alkali-activated slag-based concrete and OPC concrete during and after fire
title_sort comparison of axial behavior of rc columns using alkali-activated slag-based concrete and opc concrete during and after fire
publishDate 2023
url https://hdl.handle.net/10356/171266
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