Study of Concrete under Combined Action of Aggressive Environment and Long-Term Loading

A significant part of reinforced concrete structures is subjected to intensive environmental impact during operation. This can cause local destruction and failure of buildings if obligatory measures are not taken to protect them from corrosion. This is especially true for industrial buildings, where...

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Autores principales:	Yaroslav Blikharskyy, Jacek Selejdak, Nadiia Kopiika, Rostyslav Vashkevych
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	corrosion damages concrete corrosion material properties corrosion in RC constructions Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
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spelling	oai:doaj.org-article:581d7487a58f45909c5f8d8400b8d4482021-11-11T18:08:54ZStudy of Concrete under Combined Action of Aggressive Environment and Long-Term Loading10.3390/ma142166121996-1944https://doaj.org/article/581d7487a58f45909c5f8d8400b8d4482021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6612https://doaj.org/toc/1996-1944A significant part of reinforced concrete structures is subjected to intensive environmental impact during operation. This can cause local destruction and failure of buildings if obligatory measures are not taken to protect them from corrosion. This is especially true for industrial buildings, where the environment could be contaminated with aggressive products or waste. An important issue is the development of methods for calculating the load-bearing capacity and serviceability of reinforced concrete structures with corrosion damage. The main reason for this is the necessity to determine the durability and reliability of buildings and structures and the estimation of their safe operation time. As corrosion damages of concrete are a critical issue, more detailed experimental studies are needed. This paper presents experimental studies of concrete prisms under the simultaneous action of an aggressive environment and a constant level of compressive force. In total, 32 prisms under different loading conditions and in different aggressive medium were tested. Samples were divided in series, for which different load levels were chosen (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>0.25</mn><msub><mi>f</mi><mrow><mi>c</mi><mi>k</mi></mrow></msub></mrow></semantics></math></inline-formula>, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>0.35</mn><msub><mi>f</mi><mrow><mi>c</mi><mi>k</mi></mrow></msub></mrow></semantics></math></inline-formula>, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>0.45</mn><msub><mi>f</mi><mrow><mi>c</mi><mi>k</mi></mrow></msub></mrow></semantics></math></inline-formula>). Additionally, control samples in the air and immersed in water were tested. During the experiment, different parameters were monitored and recorded: decrease of cross-sectional size, the temperature and environmental humidity. Results of the study showed that destruction occurred due to the presence of corrosion damages of concrete and a reduction of the cross-sectional area. The stresses in the concrete at the destruction stage were less than the value of the prism strength by 10–12%. It was established that along the contour of the section, there is a partially degraded layer of concrete of 1.5–3.7 mm thickness, with corrosion microcracks and corrosion products. Additionally, experimental and theoretical diagrams of concrete with corrosion damages were obtained and compared. The ultimate deformations of concrete with corrosion damage, which correspond to the prismatic strength of concrete, in comparison with undamaged concrete were lower by 11–18%. Therefore, the concrete strength is decreased during exploitation under loading in an aggressive environment, which needs to be taken into account during calculations.Yaroslav BlikharskyyJacek SelejdakNadiia KopiikaRostyslav VashkevychMDPI AGarticlecorrosion damagesconcrete corrosionmaterial propertiescorrosion in RC constructionsTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6612, p 6612 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	corrosion damages concrete corrosion material properties corrosion in RC constructions Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	corrosion damages concrete corrosion material properties corrosion in RC constructions Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Yaroslav Blikharskyy Jacek Selejdak Nadiia Kopiika Rostyslav Vashkevych Study of Concrete under Combined Action of Aggressive Environment and Long-Term Loading
description	A significant part of reinforced concrete structures is subjected to intensive environmental impact during operation. This can cause local destruction and failure of buildings if obligatory measures are not taken to protect them from corrosion. This is especially true for industrial buildings, where the environment could be contaminated with aggressive products or waste. An important issue is the development of methods for calculating the load-bearing capacity and serviceability of reinforced concrete structures with corrosion damage. The main reason for this is the necessity to determine the durability and reliability of buildings and structures and the estimation of their safe operation time. As corrosion damages of concrete are a critical issue, more detailed experimental studies are needed. This paper presents experimental studies of concrete prisms under the simultaneous action of an aggressive environment and a constant level of compressive force. In total, 32 prisms under different loading conditions and in different aggressive medium were tested. Samples were divided in series, for which different load levels were chosen (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>0.25</mn><msub><mi>f</mi><mrow><mi>c</mi><mi>k</mi></mrow></msub></mrow></semantics></math></inline-formula>, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>0.35</mn><msub><mi>f</mi><mrow><mi>c</mi><mi>k</mi></mrow></msub></mrow></semantics></math></inline-formula>, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>0.45</mn><msub><mi>f</mi><mrow><mi>c</mi><mi>k</mi></mrow></msub></mrow></semantics></math></inline-formula>). Additionally, control samples in the air and immersed in water were tested. During the experiment, different parameters were monitored and recorded: decrease of cross-sectional size, the temperature and environmental humidity. Results of the study showed that destruction occurred due to the presence of corrosion damages of concrete and a reduction of the cross-sectional area. The stresses in the concrete at the destruction stage were less than the value of the prism strength by 10–12%. It was established that along the contour of the section, there is a partially degraded layer of concrete of 1.5–3.7 mm thickness, with corrosion microcracks and corrosion products. Additionally, experimental and theoretical diagrams of concrete with corrosion damages were obtained and compared. The ultimate deformations of concrete with corrosion damage, which correspond to the prismatic strength of concrete, in comparison with undamaged concrete were lower by 11–18%. Therefore, the concrete strength is decreased during exploitation under loading in an aggressive environment, which needs to be taken into account during calculations.
format	article
author	Yaroslav Blikharskyy Jacek Selejdak Nadiia Kopiika Rostyslav Vashkevych
author_facet	Yaroslav Blikharskyy Jacek Selejdak Nadiia Kopiika Rostyslav Vashkevych
author_sort	Yaroslav Blikharskyy
title	Study of Concrete under Combined Action of Aggressive Environment and Long-Term Loading
title_short	Study of Concrete under Combined Action of Aggressive Environment and Long-Term Loading
title_full	Study of Concrete under Combined Action of Aggressive Environment and Long-Term Loading
title_fullStr	Study of Concrete under Combined Action of Aggressive Environment and Long-Term Loading
title_full_unstemmed	Study of Concrete under Combined Action of Aggressive Environment and Long-Term Loading
title_sort	study of concrete under combined action of aggressive environment and long-term loading
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/581d7487a58f45909c5f8d8400b8d448
work_keys_str_mv	AT yaroslavblikharskyy studyofconcreteundercombinedactionofaggressiveenvironmentandlongtermloading AT jacekselejdak studyofconcreteundercombinedactionofaggressiveenvironmentandlongtermloading AT nadiiakopiika studyofconcreteundercombinedactionofaggressiveenvironmentandlongtermloading AT rostyslavvashkevych studyofconcreteundercombinedactionofaggressiveenvironmentandlongtermloading
_version_	1718431941794988032

Study of Concrete under Combined Action of Aggressive Environment and Long-Term Loading

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