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The Mechanical Properties of Early Aged Shotcrete under Internal Sulfate Attack

Shotcrete is the primary material for tunnel support due to its early rapid hardening characteristics. During tunnel construction in a sulfate environment, the hardening law of concrete will be affected. In this study, samples were prepared at six different curing times and immersed in four differen...

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Autores principales: Jin, Xiaoguang, He, Jie, Hou, Chao, Luo, Wei, He, Wenjun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8269896/
https://www.ncbi.nlm.nih.gov/pubmed/34279295
http://dx.doi.org/10.3390/ma14133726
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author Jin, Xiaoguang
He, Jie
Hou, Chao
Luo, Wei
He, Wenjun
author_facet Jin, Xiaoguang
He, Jie
Hou, Chao
Luo, Wei
He, Wenjun
author_sort Jin, Xiaoguang
collection PubMed
description Shotcrete is the primary material for tunnel support due to its early rapid hardening characteristics. During tunnel construction in a sulfate environment, the hardening law of concrete will be affected. In this study, samples were prepared at six different curing times and immersed in four different concentrations of sulfate solutions. A uniaxial test was conducted and analyzed to investigate the effect of sulfate attack on the mechanical properties of early aged shotcrete materials. Results indicated that waterlogged shotcrete does not have apparent cracks on the outside. The stress–strain curve or ultimate compressive strength of the samples showed that the effect of sulfate on shotcrete should be differentiated into chemical and physical sulfate attacks, according to the concentration of sulfate ions. The two parameters in the equation of the hardening behaviors of sulfate attack samples, ultimate compressive strength, and time constant, are related to sulfate concentration. The crack damage stress threshold of samples demonstrates that high-concentration sulfate corrosion leads to an impact on the durability of shotcrete.
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spelling pubmed-82698962021-07-10 The Mechanical Properties of Early Aged Shotcrete under Internal Sulfate Attack Jin, Xiaoguang He, Jie Hou, Chao Luo, Wei He, Wenjun Materials (Basel) Article Shotcrete is the primary material for tunnel support due to its early rapid hardening characteristics. During tunnel construction in a sulfate environment, the hardening law of concrete will be affected. In this study, samples were prepared at six different curing times and immersed in four different concentrations of sulfate solutions. A uniaxial test was conducted and analyzed to investigate the effect of sulfate attack on the mechanical properties of early aged shotcrete materials. Results indicated that waterlogged shotcrete does not have apparent cracks on the outside. The stress–strain curve or ultimate compressive strength of the samples showed that the effect of sulfate on shotcrete should be differentiated into chemical and physical sulfate attacks, according to the concentration of sulfate ions. The two parameters in the equation of the hardening behaviors of sulfate attack samples, ultimate compressive strength, and time constant, are related to sulfate concentration. The crack damage stress threshold of samples demonstrates that high-concentration sulfate corrosion leads to an impact on the durability of shotcrete. MDPI 2021-07-02 /pmc/articles/PMC8269896/ /pubmed/34279295 http://dx.doi.org/10.3390/ma14133726 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Jin, Xiaoguang
He, Jie
Hou, Chao
Luo, Wei
He, Wenjun
The Mechanical Properties of Early Aged Shotcrete under Internal Sulfate Attack
title The Mechanical Properties of Early Aged Shotcrete under Internal Sulfate Attack
title_full The Mechanical Properties of Early Aged Shotcrete under Internal Sulfate Attack
title_fullStr The Mechanical Properties of Early Aged Shotcrete under Internal Sulfate Attack
title_full_unstemmed The Mechanical Properties of Early Aged Shotcrete under Internal Sulfate Attack
title_short The Mechanical Properties of Early Aged Shotcrete under Internal Sulfate Attack
title_sort mechanical properties of early aged shotcrete under internal sulfate attack
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8269896/
https://www.ncbi.nlm.nih.gov/pubmed/34279295
http://dx.doi.org/10.3390/ma14133726
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