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    Wyświetlanie 1-12 z 12
    Tytuł:
    Corrosion of Steel in Concrete - Modeling of Electrochemical Potential Measurement in 3D Geometry
    Autorzy:
    Filipek, R.
    Szyszkiewicz-Warzecha, K.
    Szczudło, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/352732.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    reinforced concrete corrosion
    3D modeling
    non-destructive testing
    Opis:
    The paper presents a 3D model and simulations of corroding reinforcement bars in a concrete element. Electric potential distributions are calculated in the concrete matrix and on its surface for two rebars arrangements with one or three active (anodic) sites to assess the reliability and identify possible problems when standard test measurements for corrosion assessment in concrete structures are used and conclusion on the corrosion state is inferred. The values of the potential strongly depend on a concrete layer thickness and beyond the threshold of 5-7 cm it is hardly possible to detect the number of active sites on the rebar. Also conductiv-ity – which is not constant in real world constructions – is an important factor. Thus without estimation of the state of concrete it is difficult to draw reliable conclusions on the corroding activity from shear potential measurements on the surface.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 1; 117-124
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of Durability-Related Field Inspection Data from Concrete Bridges Under Service
    Autorzy:
    Konečný, P.
    Lehner, P.
    Vořechovská, D.
    Šomodíková, M.
    Horňáková, M.
    Rovnaníková, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/351362.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    reinforced concrete bridges
    field inspection
    carbonation process
    chloride ingress
    corrosion risk
    Opis:
    The level of de gradation of reinforced concrete bridges was evaluated based on the in-situ measurements performed on five reinforced concrete bridges under service located in the Czech Republic. The combined effect of carbonation and chlorides with respect to the corrosion of steel reinforcement, namely the pH and the amount of water-soluble chlorides, were evaluated on drilled core samples of concrete. Based on these parameters, the ratio between the concentrations of Cl- and OH, which indicates the ability of concrete to protect reinforcement, was calculated. All the data were statistically summarized and the relationships among them were provided. The main goal of this study is to evaluate the non-proportional effect of the amount of chlorides per mass of concrete on the risk of corrosion initiation and to localize the “critical” locations in the bridges that are the most affected by the degradation effects.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 1; 81-89
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Corrosion of RC beams during time
    Autorzy:
    Blikharskyy, Yaroslav
    Khmil, Roman
    Blikharskyy, Zinoviy
    Powiązania:
    https://bibliotekanauki.pl/articles/103955.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    corrosion
    aggressive environment
    reinforced concrete beam
    korozja
    agresywne środowisko
    wzmacnianie belki betonowej
    Opis:
    This article presented results of impact corrosion on reinforce concrete beams during time with previous loading. Before testing the RC beams were loaded by 37% and 75% from bearing-capacity load of undamaged corrosion beams. There were tested two types of beams. First type beams were tested under force loading action and second type beams were tested under force loading and corrosion action. As an aggressive environment were used the 10% solution of sulfuric acid H2SO4. Such environment takes place in separate chemical manufactures, galvanic workshops, flue pipes of thermal power plants. The results of experimental studies have established that the effect of the aggressive environment with simultaneous loading significantly impairs the stress-strain state of reinforced concrete beams. Bearing capacity due to the yielding of reinforcement bars for specimens with the simultaneous action of aggressive environment and previous loading of 37% and 75% takes place on 51…53 and 58…60 days. The destruction of these specimens, by crushing compressive concrete, at previous loading 37% occurred after 75…79 and at previous loading 75% - after 79…88 days. The history loading does not impact significantly on beams failure, on finite deflections and timing exhaustion bearing capacity since the start of the simultaneous action of aggressive environment and loading.
    Źródło:
    Quality Production Improvement - QPI; 2019, 1, 1; 311-318
    2657-8603
    Pojawia się w:
    Quality Production Improvement - QPI
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical simulation of the stressed-deformed condition of reinforced concrete beams in simultaneous influence of aggressive environment and loading
    Autorzy:
    Shmyh, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/410855.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    reinforced concrete beam
    stress-deformed state
    hypothesis of plane sections
    aggressive environment
    corrosion
    Opis:
    In this paper, the method of determining the stress-strain state of reinforced concrete beams at the simultaneous action of the aggressive medium and the load on the basis of the discrete representation of the of concrete and reinforcement μ-δ beam structures using the diagrams with the help of a computer is considered. The proposed methodology allowed to simulate the work of reinforced concrete beams at all stages of loading, including destruction. At the same time, at each stage of loading, deformations and stresses in concrete and reinforcements are obtained along the entire height of the section and along the length of the beam. The method also allows to take into account the previous tension in the valve, which takes place in the manufacturing stage. In addition, it enables to simulate the formation and development of normal and inclined cracks, the beginning of the destruction of reinforced concrete beams, determine their bearing capacity and bends. Performed with the help of the proposed methodology, calculations of experimental models of reinforced concrete beams demonstrated a good coincidence of results.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2017, 6, 3; 39-44
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Predicting changes of the state of a bridge reinforced with concrete superstructures in view of operational changes
    Autorzy:
    Ovchynnykov, Pavlo
    Dubinchyk, Olha
    Tiutkin, Oleksii
    Kildieiev, Vitalii
    Sedin, Volodymyr
    Bikus, Kateryna
    Powiązania:
    https://bibliotekanauki.pl/articles/395920.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    bridge
    superstructure
    reinforced concrete
    reinforcement
    concrete creep
    cracks
    corrosion depth
    most
    zbrojenia
    beton wzmocniony
    wzmocnienie
    pełzanie betonu
    pęknięcia
    korozja
    Opis:
    To solve the problem of predicting the service life of superstructures, this work proposes the basis and methodological developments of creep theory with increasing loads as well as regression analysis of the results of laboratory experiments. The main limitation in terms of reinforcement is corrosion in the concrete cracks, which was determined during laboratory experiments. Based on the results, the approximate analytical dependences concerning reinforcement corrosion depth change over time at a constant value of crack width were selected. The paper substantiates the validity of the analytical dependences as a result of regression analysis; it proposes formulae for determining the corrosion rate of rebars in reinforced concrete superstructures. The obtained analytical dependences allowed for the developing of a process for predicting changes to the state of the superstructure in light of operational changes.
    Źródło:
    Civil and Environmental Engineering Reports; 2019, 29, 3; 134-152
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The use of non-destructive method to evaluate the process of electrochemical corrosion of reinforcement in concrete
    Wykorzystanie nieniszczącej metody elektrochemicznej do oceny procesu korozji zbrojenia w betonie
    Autorzy:
    Raczkiewicz, W.
    Michałowska-Maziejuk, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/402533.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
    Tematy:
    reinforced concrete
    corrosion of reinforcement
    non-destructive electrochemical method
    beton zbrojony
    korozja zbrojenia
    nieniszcząca metoda elektrochemiczna
    Opis:
    The article describes non-destructive electrochemical method that assesses the severity of corrosion of reinforcement in concrete and presents experimental studies carried out in application of this method. The study was conducted on two types of concrete specimens of differing type cement: CEM I and CEM IIIA. The specimens tests were subjected to cycles of freezing and thawing process in a solution of NaCl. Then on the specimens the measurements were carried out, which allowed for the observation of degradation and the development of concrete cover of reinforcing steel corrosion. The measurements were performed with using a test apparatus by which it was possible to determine the existence of corrosion and its severity using three independent parameters: fixed potential and its gradient, the resistivity of concrete cover and densities of the corrosion current. The results obtained enabled the analysis of corrosion occurring in the specimen of reinforced concrete as well as to assess the effectiveness of the apparatus used for the measurement.
    Źródło:
    Structure and Environment; 2012, 4, 4; 21-27
    2081-1500
    Pojawia się w:
    Structure and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Corrosion of RC elements` reinforcement and its influence on the stress-strain state
    Autorzy:
    Blikharskyy, Yaroslav
    Kopiika, Nadiia
    Blikharskyy, Zinoviy
    Powiązania:
    https://bibliotekanauki.pl/articles/103969.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    corrosion
    reinforced concrete elements
    steel bars
    stress-strain state
    korozja
    elementy żelbetowe
    pręty stalowe
    stan naprężenie-odkształcenie
    Opis:
    The stress-strain state of reinforced concrete elements is rather complicated issue of scientific research, which integrates different factors, such as the load type, atmospheric conditions, various defects, damages, geometric deviations. It is commonly known that corrosion of reinforced concrete elements affects both the strength and deformation parameters of the structure significantly; thus, internal stresses` parameters are also influenced. Therefore, detailed theoretical investigation of this issue is the main goal of this article. The detailed literature review and thorough analysis was conducted concerning previous experimental and theoretical studies of the corrosion defects` influence on the reinforced concrete elements` stress-strain state. Existing data and results were systematized and analyzed. On the basis of provided research it could be concluded that the reinforced concrete elements` stressstrain state greatly depends on existing damages and impurities. The stress-strain state could be complicated on micro-scale due to material chemical and mechanical peculiarities; simultaneously on macro-scale the bearing capacity is of the structure could be reduced in general. In the articles existing methods for this issue simulation and evaluation are described and perspective fields for further research are identified. The practical significance of the article is due to complex approach to the research and multilateral identification of the main issue key points.
    Źródło:
    Quality Production Improvement - QPI; 2020, 2, 1; 214-220
    2657-8603
    Pojawia się w:
    Quality Production Improvement - QPI
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    FEM modeling of rebar corrosion - numerical verification of experimental research
    Modelowanie MES korozji zbrojenia - weryfikacja numeryczna badań doświadczalnych
    Autorzy:
    Krykowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/395825.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    korozja
    teoria plastyczności
    MES (metoda elementów skończonych)
    korozja zbrojenia
    corrosion
    theory of plasticity
    FEM
    reinforced concrete degradation
    Opis:
    The paper presents the experimental verification of concrete cover splitting time theory based on the multicomponent media approach and FEM. The results of computer analysis are compared with the experiment presented in the work of Youping Liu [15]. The solid model of the structure analyzed in the paper [15] has been made. The problem has been analyzed by using the program for the elastic plastic analysis with distortions by using FEM.
    W pracy przedstawiono zastosowanie modelu bazującego na teorii ośrodków wieloskładnikowych i MES do wyznaczania czasu odspojenia otuliny betonowej. Wyniki analiz komputerowych porównano z wynikami eksperymentalnymi otrzymanymi w pracy [15]. Dla potrzeb analizy komputerowej wykonano model przestrzenny konstrukcji. Zagadnienie analizowano programem do obliczania konstrukcji w zakresie sprężystoplastycznym z dystorsjami mechanicznymi. Algorytm zaimplementowany w programie był modyfikowany stosownie do założeń teoretycznych modelu degradacji otuliny [9]. Jako wynik analizy otrzymano czas pękania otuliny [...]. W wyniku przeprowadzonych obliczeń stwierdzono dobrą korelację wyników teoretycznych z wynikami eksperymentalnymi.
    Źródło:
    Civil and Environmental Engineering Reports; 2010, 5; 205-218
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The impact of a polyurea layer on cracking and performance of reinforced concrete beams under breaking load
    Wpływ warstwy polimocznika na zarysowanie i pracę pod obciążeniem niszczącym belek żelbetowych
    Autorzy:
    Szafran, Jacek
    Matusiak, Artur
    Rzeszut, Katarzyna
    Jankowiak, Iwona
    Powiązania:
    https://bibliotekanauki.pl/articles/2142748.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
    Tematy:
    polyurea
    corrosion
    reinforced concrete beams
    breaking load
    cracks
    durability
    polimocznik
    korozja
    belki żelbetowe
    obciążenie niszczące
    rysy
    trwałość
    Opis:
    The paper discusses the results of laboratory experimental studies on reinforced concrete components (beams) with an outer polyurea layer. The important part of the study is the comparison of the results concerning the load-displacement relation for the reference beams (without the polyurea layer on their external surfaces) and those with the polyurea layer. The main conclusion from this part of the research is that the beam elements covered with a polyurea layer are protected against corrosion processes even in an emergency state. The occurrence of scratches, even of large size, is neutralized by the coating that effectively bridges them.
    W artykule zaprezentowano wyniki laboratoryjnych badań eksperymentalnych dotyczących elementów żelbetowych (belek) wraz z zewnętrzną warstwą polimocznika. Istotną częścią pracy jest porównanie wyników zależności obciążenie - przemieszczenie dla belek referencyjnych (bez warstwy polimocznika na powierzchniach zewnętrznych) oraz tych taką warstwę posiadającą. Kluczowym wnioskiem płynącym z tej części badań jest ten mówiący o tym, że elementy belkowe pokryte warstwą polimocznika zabezpieczone są przed korozją nawet w stanie awaryjnym. Występowanie rys nawet znacznych rozmiarów jest zneutralizowane poprzez skuteczne ich mostkowanie powłoką.
    Źródło:
    Structure and Environment; 2022, 14, 3; 76--82
    2081-1500
    Pojawia się w:
    Structure and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of the damaged reinforcing bars on the stress-strain state of the rein-forced concrete beams
    Autorzy:
    Blikharskyy, Z.
    Shnal, T.
    Khmil, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/111738.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    corrosion
    damage
    armature
    stress-strain state
    reinforced concrete
    beam
    korozja
    wzmocniony beton
    belki
    agresywne środowisko
    stan naprężenie-odkształcenie
    Opis:
    The article is devoted to the overall view of experimental research of reinforced concrete beams with the simultaneous influence of the corrosion environment and loading. The tests have been carried out upon the reinforced concrete specimens considering the corrosion in the acid environment, namely 10 % H2SO4 that have been taken as a model of the aggressive environment. The beams are with span equalling to 1,9m with different series of tensile armature, concrete compressive strength and different length of impact of corrosion (continuous and local). The influence of simultaneous action of the aggressive environment and loading on strength of reinforced-concrete beams has been described. For a detailed study of the effect of individual components there was suggested additional experimental modelling of the only tensile armature damage without concrete damage. It will investigate the influence of this factor irrespective of the concrete.
    Źródło:
    Production Engineering Archives; 2017, 14; 23-26
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Carrying capacity assessment and strengthening of reinforced concrete structures operating in chemically aggressive environment
    Ocena nośności i wzmacnianie konstrukcji żelbetowych pracujących w środowisku agresywnym chemicznie
    Autorzy:
    Wciślik, W.
    Kossakowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/402372.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
    Tematy:
    reinforced concrete structures
    chemical corrosion
    diagnostics
    carrying capacity assessment
    structural strengthening
    konstrukcje żelbetowe
    korozja chemiczna
    diagnostyka
    ocena nośności
    wzmocnienie konstrukcji
    Opis:
    The paper presents a case of an industrial building in the chemical works, in which intensive production processes caused corrosion and weakened structural members. The results of investigations and static strength analysis are provided. They were necessary to assess the reliability of the structure operating under chemical corrosion conditions corresponding to the XA exposure class. The repair plan, already implemented, together with selected components of the building structural upgrade design are presented.
    Źródło:
    Structure and Environment; 2016, 8, 4; 224-228
    2081-1500
    Pojawia się w:
    Structure and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculation of flexible bending elements of a flight structure given their actual condition
    Autorzy:
    Soatova, Nodira
    Powiązania:
    https://bibliotekanauki.pl/articles/2116403.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    resource impact of corrosion
    span structure
    deflections
    reinforced concrete elements
    calculation method
    wpływ korozji na zasoby
    konstrukcje przęseł
    ugięcia
    element żelbetowy
    metoda obliczeniowa
    Opis:
    This article presents the results of the analysis of experimental data on testing of reinforced concrete elements for multiple-repeated loads and field tests of operated span structures. This article proposes dependencies on the definition of deflections during the operation period. Based on the processing of the available experimental data, dependences are proposed for determining deflections under multiple repeated loads, and on this basis, dependences are obtained for predicting the residual life of span elements. The initial data for the calculations are the data on the accumulated residual deflections determined in the process of technical diagnostics.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2021, 110; 115--123
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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