scholarly journals Quantitative Design Methods for Protection Against Corrosion of Reinforced Concrete Structures During Various Stages of their Life Cycle

2020 ◽  
Vol 28 (3) ◽  
pp. 8-12
Author(s):  
Mykola Savytskyi ◽  
Stanislav Uncik ◽  
Olexandr Bardakh ◽  
Andriy Savytskyi ◽  
Tetiana Shevchenko ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structures ◽  
Design Methods ◽  
Economic Feasibility ◽  
National Standards ◽  
Reinforced Concrete Structures ◽  
Quantitative Methodology ◽  
Aggressive Environment ◽  
Quantitative Design ◽  
Kinetics Of

AbstractThere are large amounts of reinforced concrete structures that have undergone damage from corrosion at their operational stage. The Eurocodes and national standards do not contain any guidelines for designing primary protection and repair systems for reinforced concrete structures. Our research shows the economic feasibility of designing reinforced concrete structures that can interact with an aggressive environment, taking into account the kinetics of concrete corrosion. Optimal design methods can be used to obtain the most economical solutions. We have developed a quantitative methodology for the design of the primary protection of reinforced concrete structures.

scholarly journals Directions of Convergence of the Requirements of the Main Domestic Standard for the Design of Concrete and Reinforced Concrete Structures SP 63.13330.2012 with the Requirements of the International Standard ISO 19338

2019 ◽  
pp. 93-98
Author(s):  
Sergey B. Krylov ◽  
Ravil S. Sharipov ◽  
Sergey A. Zenin ◽  
Yury S. Volkov
Keyword(s):  
Reinforced Concrete ◽  
Prestressed Concrete ◽  
Concrete Structures ◽  
National Standards ◽  
Reinforced Concrete Structures ◽  
Building Structures ◽  
Design Standards ◽  
Structural Concrete ◽  
International Standard ◽  
Assessment Requirements

Design standards on building structures should contain, first of all, the performance and assessment requirements of structures. At the same time, design standards should provide the possibility for design and construction of concrete and reinforced concrete parts of buildings and structures that meet the requirements of the Technical regulations "On the safety of buildings and structures". Taking into account the importance of ensuring the reliability and safety of buildings and structures erected with the use of structural concrete, the technical Committee of the international organization for standardization ISO TC 71 "Concrete, reinforced concrete and prestressed concrete", certifies national standards for compliance with the requirements of the international standard ISO 19338 "Performance and Assessment Requirements for Design Standards on Structural Concrete", developed by the same Committee. The standard describes the issues that should be included in the standards for the design of concrete and reinforced concrete structures (terms and definitions, basic requirements, performance requirements,loads and impacts, design estimates, requirements for manufacturing and construction, as well as quality control). These requirements are common to all standards in the design of concrete and reinforced concrete structures. In this regard, it is relevant and important to establish the possibility of presenting the National Code of rules SP 63.13330.2012 "SNiP 52.01-2003 Plain and Reinforced Concrete Structures. General Provisions" for certification for compliance with the requirements of ISO 19338. To achieve this goal, the relevant work has been done, based on the results of which were made the proposals for the submission of SP 63.13330.2012 for certification for compliance with ISO 19338:2014. These proposals are set out in the text of the article.

Analysis of the selection of building materials for the reconstruction of concrete and reinforced concrete structures damaged by an aggressive environment

2021 ◽  
Vol 80 (2) ◽  
pp. 188-194
Author(s):  
B.M. Aubakirova ◽  
◽  
Е.R. Onlasynov ◽  
Keyword(s):  
Reinforced Concrete ◽  
Building Materials ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Aggressive Environment ◽  
Selection Of

This article discusses the results of the analysis of the use of building materials in the restoration of concrete and reinforced concrete structures of buildings and structures that erupt from an aggressive environment.

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

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6612
Author(s):  
Yaroslav Blikharskyy ◽  
Jacek Selejdak ◽  
Nadiia Kopiika ◽  
Rostyslav Vashkevych
Keyword(s):  
Reinforced Concrete ◽  
Concrete Strength ◽  
Aggressive Medium ◽  
Experimental Studies ◽  
Concrete Structures ◽  
Corrosion Damage ◽  
Simultaneous Action ◽  
Reinforced Concrete Structures ◽  
Cross Sectional ◽  
Aggressive Environment

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 (0.25fck, 0.35fck, 0.45fck). 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.

The Development of Coating Systems Based on Alkali Activated Slag for Protecting Reinforced Concrete Structures

2016 ◽  
Vol 865 ◽  
pp. 87-94
Author(s):  
Ámos Dufka ◽  
Tomáš Melichar ◽  
Jiří Bydžovský
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Slag Coating ◽  
Alkali Activated Slag ◽  
Aggressive Environment ◽  
Activated Slag ◽  
Alkali Activated

Theme of the article is the development of coating systems based on alkali activated stag intended for protection of reinforced concrete constructions exposed to chemically aggressive environments. At present mainly polymer based secondary protections are used for this purpose. The coating systems based on alkali activated slag have potential to surpass these generally applied types of secondary protections in many aspects. For instance for constructions exposed to synergic actuation of chemically aggressive environment and increased temperatures. Findings obtained from alkali activated slag coating exposed to selected aggressive environment types for six months are presented in this article.

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