Microstructure and life prediction model of steel slag concrete under freezing-thawing environment

The goals of this paper are to study the frost resistance of steel slag concrete (SSC), research the damage mechanisms, and predict the service life of SSC in cold regions. First, the stability of steel slag (SS) was tested, and then SS samples with different treatment dosages were used as aggregate...

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Autores principales:	Wen Yang, Sun Hui, Hu Shuaidong, Xu Guangmao, Wu Xiazhi, Song Congcong, Liu Zhen, Li Zhaojian
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	steel slag concrete microstructure freezing-thawing damage model Technology T Chemical technology TP1-1185 Physical and theoretical chemistry QD450-801
Acceso en línea:	https://doaj.org/article/9621b47641f943a598b714d81081b713
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spelling	oai:doaj.org-article:9621b47641f943a598b714d81081b7132021-12-05T14:10:58ZMicrostructure and life prediction model of steel slag concrete under freezing-thawing environment2191-909710.1515/ntrev-2021-0109https://doaj.org/article/9621b47641f943a598b714d81081b7132021-11-01T00:00:00Zhttps://doi.org/10.1515/ntrev-2021-0109https://doaj.org/toc/2191-9097The goals of this paper are to study the frost resistance of steel slag concrete (SSC), research the damage mechanisms, and predict the service life of SSC in cold regions. First, the stability of steel slag (SS) was tested, and then SS samples with different treatment dosages were used as aggregates to replace natural aggregates of equal volumes in the preparation of C40 concrete. The microstructures of concrete and micro properties of cement hydration products were investigated in nanospace in this research. In addition, rapid frost resistance durability tests were carried out under laboratory conditions. The results revealed that the ordinary concrete (OC) exhibited a more serious damage phenomenon, and the mass loss and relative dynamic elastic modulus of OC were changed by 5.27 and 62.30%, respectively. However, with increases in the SS content, the losses in mass were lowered. Furthermore, the relative dynamic elastic modulus decreased less, and the frost resistance of the specimens was stronger. The range of mass loss rate was between 2.233 and 3.024%, and the relative dynamic elastic modulus range was between 74.92 and 91.09%. A quadratic function with a good fitting degree was selected to establish a freezing-thawing damage calculation model by taking the relative dynamic elastic modulus as the variable. Then, the freezing-thawing durability lifespan of concrete in the colder regions of northern China was successfully predicted by using the damage calculation model. The results of SSC20–60 showed the better frost resistance durability when the content of SS sand was 20% and the dosage of SS stone was 60%. Its frost resistance lifespan was more than twice that of OC, which demonstrated that SS as an aggregate could effectively improve the frost resistance lifespan of concrete to a certain extent.Wen YangSun HuiHu ShuaidongXu GuangmaoWu XiazhiSong CongcongLiu ZhenLi ZhaojianDe Gruyterarticlesteel slag concretemicrostructurefreezing-thawing damage modelTechnologyTChemical technologyTP1-1185Physical and theoretical chemistryQD450-801ENNanotechnology Reviews, Vol 10, Iss 1, Pp 1776-1788 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	steel slag concrete microstructure freezing-thawing damage model Technology T Chemical technology TP1-1185 Physical and theoretical chemistry QD450-801
spellingShingle	steel slag concrete microstructure freezing-thawing damage model Technology T Chemical technology TP1-1185 Physical and theoretical chemistry QD450-801 Wen Yang Sun Hui Hu Shuaidong Xu Guangmao Wu Xiazhi Song Congcong Liu Zhen Li Zhaojian Microstructure and life prediction model of steel slag concrete under freezing-thawing environment
description	The goals of this paper are to study the frost resistance of steel slag concrete (SSC), research the damage mechanisms, and predict the service life of SSC in cold regions. First, the stability of steel slag (SS) was tested, and then SS samples with different treatment dosages were used as aggregates to replace natural aggregates of equal volumes in the preparation of C40 concrete. The microstructures of concrete and micro properties of cement hydration products were investigated in nanospace in this research. In addition, rapid frost resistance durability tests were carried out under laboratory conditions. The results revealed that the ordinary concrete (OC) exhibited a more serious damage phenomenon, and the mass loss and relative dynamic elastic modulus of OC were changed by 5.27 and 62.30%, respectively. However, with increases in the SS content, the losses in mass were lowered. Furthermore, the relative dynamic elastic modulus decreased less, and the frost resistance of the specimens was stronger. The range of mass loss rate was between 2.233 and 3.024%, and the relative dynamic elastic modulus range was between 74.92 and 91.09%. A quadratic function with a good fitting degree was selected to establish a freezing-thawing damage calculation model by taking the relative dynamic elastic modulus as the variable. Then, the freezing-thawing durability lifespan of concrete in the colder regions of northern China was successfully predicted by using the damage calculation model. The results of SSC20–60 showed the better frost resistance durability when the content of SS sand was 20% and the dosage of SS stone was 60%. Its frost resistance lifespan was more than twice that of OC, which demonstrated that SS as an aggregate could effectively improve the frost resistance lifespan of concrete to a certain extent.
format	article
author	Wen Yang Sun Hui Hu Shuaidong Xu Guangmao Wu Xiazhi Song Congcong Liu Zhen Li Zhaojian
author_facet	Wen Yang Sun Hui Hu Shuaidong Xu Guangmao Wu Xiazhi Song Congcong Liu Zhen Li Zhaojian
author_sort	Wen Yang
title	Microstructure and life prediction model of steel slag concrete under freezing-thawing environment
title_short	Microstructure and life prediction model of steel slag concrete under freezing-thawing environment
title_full	Microstructure and life prediction model of steel slag concrete under freezing-thawing environment
title_fullStr	Microstructure and life prediction model of steel slag concrete under freezing-thawing environment
title_full_unstemmed	Microstructure and life prediction model of steel slag concrete under freezing-thawing environment
title_sort	microstructure and life prediction model of steel slag concrete under freezing-thawing environment
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/9621b47641f943a598b714d81081b713
work_keys_str_mv	AT wenyang microstructureandlifepredictionmodelofsteelslagconcreteunderfreezingthawingenvironment AT sunhui microstructureandlifepredictionmodelofsteelslagconcreteunderfreezingthawingenvironment AT hushuaidong microstructureandlifepredictionmodelofsteelslagconcreteunderfreezingthawingenvironment AT xuguangmao microstructureandlifepredictionmodelofsteelslagconcreteunderfreezingthawingenvironment AT wuxiazhi microstructureandlifepredictionmodelofsteelslagconcreteunderfreezingthawingenvironment AT songcongcong microstructureandlifepredictionmodelofsteelslagconcreteunderfreezingthawingenvironment AT liuzhen microstructureandlifepredictionmodelofsteelslagconcreteunderfreezingthawingenvironment AT lizhaojian microstructureandlifepredictionmodelofsteelslagconcreteunderfreezingthawingenvironment
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Microstructure and life prediction model of steel slag concrete under freezing-thawing environment

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