Effect of Stress–Strength Ratio on Creep Property of Sodium Silicate–Based Alkali-Activated Slag Concrete

Alkali-activated materials have attracted increasing interest owing to their excellent properties and environmental protection. However, there have been few studies on their creep properties. The aim of this article is to investigate the effect of the stress−strength ratio on the creep pro...

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Main Authors: Xianyu Zhou, Ying Wang, Wenzhong Zheng, Pang Chen, Yusheng Zeng
Format: Article
Language:English
Published: MDPI AG 2019-09-01
Series:Applied Sciences
Subjects:
Online Access:https://www.mdpi.com/2076-3417/9/18/3643
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spelling doaj-a0cf14acc0334454b63a1769e58a0dcd2020-11-25T01:18:49ZengMDPI AGApplied Sciences2076-34172019-09-01918364310.3390/app9183643app9183643Effect of Stress–Strength Ratio on Creep Property of Sodium Silicate–Based Alkali-Activated Slag ConcreteXianyu Zhou0Ying Wang1Wenzhong Zheng2Pang Chen3Yusheng Zeng4School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, ChinaSchool of Civil Engineering, Harbin Institute of Technology, Harbin 150090, ChinaSchool of Civil Engineering, Harbin Institute of Technology, Harbin 150090, ChinaSchool of Civil Engineering, Harbin Institute of Technology, Harbin 150090, ChinaSchool of Civil Engineering, Harbin Institute of Technology, Harbin 150090, ChinaAlkali-activated materials have attracted increasing interest owing to their excellent properties and environmental protection. However, there have been few studies on their creep properties. The aim of this article is to investigate the effect of the stress−strength ratio on the creep property of sodium silicate−based alkali-activated slag (AAS) concrete. For this reason, five groups of AAS concrete with different stress−strength ratios (0.15, 0.3, 0.45, 0.6, and 0.75) were tested. The results indicate that the creep of AAS concrete has a convergent nonlinear stage and a non-convergent stage but not an obvious linear stage. The AAS concrete basically has a consistent creep coefficient and diverse specific creep under a stress−strength ratio of 0.15−0.6. The elasticity modulus of AAS is much smaller than that of ordinary Portland cement (OPC) concrete, which is the reason for the greater creep compared to that in OPC concrete, and the inaccuracy of the model prediction. By applying the actual elastic modulus, the models can predict the specific creep and stress-dependent strain of AAS concrete with a 0.3 stress−strength ratio, except for the B3 model. The secant modulus of AAS concrete decreases linearly with an increase in the stress−strength ratio. Finally, we propose an improved creep model for AAS concrete with a wide stress−strength ratio based on the GL2000 model.https://www.mdpi.com/2076-3417/9/18/3643alkali activatedslagcreepstress–strength ratiocreep model
collection DOAJ
language English
format Article
sources DOAJ
author Xianyu Zhou
Ying Wang
Wenzhong Zheng
Pang Chen
Yusheng Zeng
spellingShingle Xianyu Zhou
Ying Wang
Wenzhong Zheng
Pang Chen
Yusheng Zeng
Effect of Stress–Strength Ratio on Creep Property of Sodium Silicate–Based Alkali-Activated Slag Concrete
Applied Sciences
alkali activated
slag
creep
stress–strength ratio
creep model
author_facet Xianyu Zhou
Ying Wang
Wenzhong Zheng
Pang Chen
Yusheng Zeng
author_sort Xianyu Zhou
title Effect of Stress–Strength Ratio on Creep Property of Sodium Silicate–Based Alkali-Activated Slag Concrete
title_short Effect of Stress–Strength Ratio on Creep Property of Sodium Silicate–Based Alkali-Activated Slag Concrete
title_full Effect of Stress–Strength Ratio on Creep Property of Sodium Silicate–Based Alkali-Activated Slag Concrete
title_fullStr Effect of Stress–Strength Ratio on Creep Property of Sodium Silicate–Based Alkali-Activated Slag Concrete
title_full_unstemmed Effect of Stress–Strength Ratio on Creep Property of Sodium Silicate–Based Alkali-Activated Slag Concrete
title_sort effect of stress–strength ratio on creep property of sodium silicate–based alkali-activated slag concrete
publisher MDPI AG
series Applied Sciences
issn 2076-3417
publishDate 2019-09-01
description Alkali-activated materials have attracted increasing interest owing to their excellent properties and environmental protection. However, there have been few studies on their creep properties. The aim of this article is to investigate the effect of the stress−strength ratio on the creep property of sodium silicate−based alkali-activated slag (AAS) concrete. For this reason, five groups of AAS concrete with different stress−strength ratios (0.15, 0.3, 0.45, 0.6, and 0.75) were tested. The results indicate that the creep of AAS concrete has a convergent nonlinear stage and a non-convergent stage but not an obvious linear stage. The AAS concrete basically has a consistent creep coefficient and diverse specific creep under a stress−strength ratio of 0.15−0.6. The elasticity modulus of AAS is much smaller than that of ordinary Portland cement (OPC) concrete, which is the reason for the greater creep compared to that in OPC concrete, and the inaccuracy of the model prediction. By applying the actual elastic modulus, the models can predict the specific creep and stress-dependent strain of AAS concrete with a 0.3 stress−strength ratio, except for the B3 model. The secant modulus of AAS concrete decreases linearly with an increase in the stress−strength ratio. Finally, we propose an improved creep model for AAS concrete with a wide stress−strength ratio based on the GL2000 model.
topic alkali activated
slag
creep
stress–strength ratio
creep model
url https://www.mdpi.com/2076-3417/9/18/3643
work_keys_str_mv AT xianyuzhou effectofstressstrengthratiooncreeppropertyofsodiumsilicatebasedalkaliactivatedslagconcrete
AT yingwang effectofstressstrengthratiooncreeppropertyofsodiumsilicatebasedalkaliactivatedslagconcrete
AT wenzhongzheng effectofstressstrengthratiooncreeppropertyofsodiumsilicatebasedalkaliactivatedslagconcrete
AT pangchen effectofstressstrengthratiooncreeppropertyofsodiumsilicatebasedalkaliactivatedslagconcrete
AT yushengzeng effectofstressstrengthratiooncreeppropertyofsodiumsilicatebasedalkaliactivatedslagconcrete
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