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    Wyświetlanie 1-13 z 13
    Tytuł:
    Prediction of the reinforced concrete structure durability under the risk of carbonation and chloride aggression
    Autorzy:
    Czarnecki, L.
    Woyciechowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/201976.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    concrete durability
    chloride aggression
    carbonation
    durability prognosis
    Opis:
    The paper presents an idea of predicting durability of concrete structures with steel reinforcement under conditions of chloride and carbonation corrosion risk. Mechanisms of destruction due to steel corrosion in such conditions are shown. The recently elaborated model of carbonation and general model of chloride diffusion have been discussed. An algorithm of the rest service life time prognosis has been shown and options of its main stages realization have been done. An example of durability prognosis for pre-stressed hollow-core floor slab with upper layer of concrete and epoxy-resin coating has been given. This example confirms the usefulness of the described prognosis method and demonstrates its helpfulness in a structure management according to the standards of EN 1504 series.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 1; 173-181
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The durability of prestressed concrete elements reinforced with fibres
    Autorzy:
    Corobceanu, V.
    Giusca, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/201052.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    durability
    prestressed concrete
    fibres
    Opis:
    The aim of the study is to show the improvements on durability of prestressed concrete elements by introducing in concrete mass a certain quantity of fibres. Random distributed fibres provide a significant increase in the tensile strength, having also favourable consequence on other mechanical and durability characteristics. The prestressed concrete elements are under a permanent stress state that is not optimal in all their sections and zones. One of the most unfavourable effects is the reduction of material durability, especially in aggressive environments, in which prestressed reinforcements are more sensitive to utilization than reinforced concrete components. The authors present the result brought up by the use of steel fibres in the improvement of the durability of concrete elements, in relation with the volumetric steel ratio, and the geometrical ratio of steel fibres, leading to a favourable effect on prestressing efficiency.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 1; 165-170
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A surface engineering approach applicable to concrete repair engineering
    Autorzy:
    Garbacz, A.
    Courard, L.
    Bissonnette, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/202018.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    durability of concrete structure
    repair
    adhesion
    surface roughness
    microcracking
    surface engineering
    Opis:
    The objective of the paper is to analyze the effect of substrate roughness and superficial microcraking upon adhesion of repair systems using concrete surface engineering approach. The results presented in this paper have been obtained within the framework of research projects performed to develop a better understanding of the factors affecting the adhesion of repair materials through a surface engineering approach. Based on the results of investigations, the authors showed that the durability and quality of concrete repairs depend to a large degree on the characteristics of the substrate. Mechanical preparation and profiling of the concrete surface to be repaired has to be balanced with potential co-lateral effects such as superficial cracking, too often induced as a result of inappropriate concrete removal method selection, and the loss of benefits due to better mechanical anchorage. The results obtained confirm also that Concrete Surface Engineering, as a scientific concept, will definitely contribute to shed more light on how to optimize repair bond, taking into account interactions between the materials at different observation scales.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 1; 73-84
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental verification of carbonation models used for estimation of reinforced concrete structures durability
    Autorzy:
    Stańczak, D.
    Kuziak, J.
    Woyciechowski, P.
    Czarnecki, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/201118.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    concrete
    reinforced concrete
    concrete carbonation
    modelling
    self-terminating carbonation model
    durability
    cover thickness
    Opis:
    The subject of the article is a comparison of two types of concrete carbonation models: self-limited carbonation and infinite carbonation. The results of the research on the progress of carbonation during six years of sample exposure in natural atmospheric conditions were used to determine the detailed models for a set of concretes with different w/c and different types of cement, and two scenarios of initial curing. It has been established that the model of self-limiting carbonation (i.e. hyperbolic) is more adequate for describing laboratory tests results in natural conditions.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 5; 1159-1166
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fatigue assessment of existing riveted truss bridges: case study
    Autorzy:
    Siwowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/202445.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    durability
    fatigue
    steel structure
    bridge
    riveted truss
    eurocodes
    trwałość
    zmęczenie
    konstrukcja stalowa
    most
    nitowana kratownica
    eurokody
    Opis:
    Many steel riveted bridges have been built in Poland since 1950 and they have not reached their design working lives yet. Nevertheless, a number of fatigue damages are found, especially with structural joints. Moreover, in the past 25 years the traffic on the Polish road network has increased significantly leading to the increasing number of heavy vehicles in the traffic flows. This may affect the safety, serviceability and durability of existing bridges. The road administration is therefore interested in reliable and agreed methods to assess the safety and durability of existing bridges. The special procedure has been prepared to provide technical insight on the way in which existing steel structures could be assessed and the remaining fatigue life could be estimated. This approach follows the principles and application rules in the Eurocodes and provides a scheme with various levels of analysis: a basic level with general methods and further levels, more complex and sophisticated and requiring specific experience and knowledge. This procedure has been used for the fatigue assessment of the 60-year-old riveted truss bridge. The applied procedure as well as the main results of the assessment have been presented in the paper.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 1; 125--133
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of a polyurea coating on bent reinforced concrete beams with various reinforcement ratios
    Autorzy:
    Szafran, Jacek
    Matusiak, Artur
    Rzeszut, Katarzyna
    Jankowiak, Iwona
    Powiązania:
    https://bibliotekanauki.pl/articles/2204495.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    reinforced concrete beams
    polyurea
    cracks
    durability of reinforced concrete elements
    belka żelbetowa
    polimocznik
    pęknięcie
    trwałość elementów żelbetowych
    Opis:
    “Polyurea coatings as a possible structural reinforcement system” is a research project aimed at exploring possible applications of polyurea coatings for improving structural performance (including steel, concrete, wooden and other structures used in the construction industry). As part of the project, this paper focuses on evaluating the performance of bent reinforced concrete (RC) beams covered with a polyurea coating system. Easy polyurea application and its numerous advantages can prove very useful when existing RC structural elements are repaired or retrofitted. Laboratory tests of three types of RC beams with three different longitudinal reinforcement ratios were performed for the purposes of this paper. The tests were designed to determine the bending strength, performance and cracking patterns of the coated RC beams. In addition, a theoretical model was developed to predict the impact of the polyurea coating on the bending strength of the RC beams. On this basis, the effect of the coating on the bending strength and the performance of the coated beams at the ultimate limit state (ULS) was examined and analyzed. The results showed that the use of the polyurea coating has a positive impact on the cracking state of the RC beams subject to bending and little effect on their bending strength.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 1; art. no. e144579
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Non-destructive and semi-destructive diagnostics of concrete structures in assessment of their durability
    Autorzy:
    Hoła, J.
    Bień, J.
    Sadowski, Ł.
    Schabowicz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/199847.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    concrete
    durability
    diagnostics
    non-destructive tests
    semi-destructive tests
    trwałość betonu
    diagnostyka
    testy niedestrukcyjne
    testy pół-destrukcyjne
    Opis:
    This paper proposes a comprehensive classification of test methods for the diagnosis of concrete structures. The main focus is on the ranges of suitability of the particular methods and techniques for assessing the durability of structures, depending on the principal degradation mechanisms and their effects on this durability. The survey covers non-destructive testing (NDT) methods, which do not in any way breach the integrity of the tested structures, and semi-destructive testing (SDT) methods requiring material samples to be taken or any other minor breach of structural integrity. An original taxonomy of physical, chemical and biological diagnostic methods, useful in assessment of concrete structures durability, is proposed. Equipment specific for selected advanced testing methods is presented as well as exemplary test results.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 1; 87-96
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the precipitation process of secondary phases after long-term ageing of the S304H steel
    Autorzy:
    Zieliński, Adam
    Wersta, Robert
    Sroka, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2086867.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    S304H steel
    microstructure
    precipitates
    ageing
    loss of durability
    stal S304H
    mikrostruktura
    wytrącanie
    starzenie
    utrata trwałości
    Opis:
    S304H steel is used in the construction of pressure components of boilers with supercritical operating parameters. The paper presents the results of research on the microstructure following ageing for 30,000 hours at 650 and 700°C. Microstructure examination was performed using scanning and transmission electron microscopy. The precipitates were identified using transmission electron microscopy. The paper analyses the precipitation process and its dynamics depending on the temperature and ageing time in detail. MX carbonitrides and the ε_Cu phase were proved to be the most stable phase, regardless of the test temperature. It was also showed that the M₂₃C₆ carbide precipitates in the tested steel and the intermetallic sigma phase (σ) may play a significant role in the loss of durability of the tested steel. This is related to their significant increase due to the influence of elevated temperature, and their coagulation and coalescence dynamics strongly depend on the ageing/operating temperature level. The qualitative and quantitative identification of the secondary phase precipitation processes described in the study is important in the analysis of the loss of durability of the tested steel under creep conditions.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 5; e137520, 1--7
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fatigue durability of asphalt-cement mixtures
    Autorzy:
    Kuźniewski, J.
    Skotnicki, Ł.
    Szydło, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/202113.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dynamic stiffness modulus
    fatigue durability
    asphalt-cement mixtures
    fatigue criterions
    dynamiczny moduł sztywności
    wytrzymałość na zmęczenie
    mieszanki asfaltowo-cementowe
    kryteria zmęczeniowe
    Opis:
    This paper focuses on examinations of asphalt-cement mixtures (ACM). This is a recycled material which can be used in road pavement layers. In the article stiffness modulus tests and fatigue tests of asphalt-cement mixtures were shown. The authors decided to lead research on fatigue durability of asphalt-cement mixtures to set fatigue characteristics of these materials. So far in research or other works any adequate fatigue criterion for ACM mixtures has not been developed. As a result of the examinations a level of fatigue damage was suggested. For new fatigue damage a strain level in one million load cycle was estimated. Based on that a fatigue design criterion for asphalt-cement mixtures was estimated.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 1; 107-111
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determining equivalent performance for frost durability of concrete containing different amounts of ground granulated blast furnace slag
    Autorzy:
    Wawrzeńczyk, J.
    Juszczak, T.
    Molendowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/200482.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    equivalent concrete performance concept ECPC
    frost durability
    ground granulated blast-furnace slag
    ggbfs
    beton
    wydajność
    koncepcja ECPC
    trwałość
    mielony granulowany żużel wielkopiecowy
    Opis:
    This paper deals with the issues pertinent to the design of frost-resistant concretes in exposure class XF3 (high water saturation) when the concretes are made with cements containing ground granulated blast furnace slag (ggbs). The testing programme covered four series of non-air entrained concrete made with cements CEM I, CEM II/A-S, CEM II/B-S and CEM III/A containing 0%, 13%, 28% and 53% ggbs respectively, and two non-air entrained concrete series with the binder made from CEM I and 0 to 55% ggbs. The water-binder (w/b) ratio ranged from 0.25 to 0.55. Frost durability testing was performed using a modified ASTM C666A procedure to determine changes in mass (dm) and beam length (dL). The relationships occurring between the w/b ratio and ggbs content in the binder and the length change (dL) of the specimens were described using curvilinear regression functions, through the analysis of artificial neural networks. Slag-content-dependent critical values of the w/b ratio were determined taking the length change dL = 1.3 mm to be the criterion for the resistance to internal cracking. In the authors’ view, this approach can be a good method for checking equivalent performance of concretes made with cements containing mineral additions.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 4; 731-737
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Scientific basis and rules of thumb in civil engineering: conflict or harmony?
    Autorzy:
    Czarnecki, L.
    Gemert, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/200291.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    building performance
    appraiser
    matrix of the science of construction
    rule of thumb
    durability
    complexity
    diversified development
    wydajność budowy
    rzeczoznawca
    zasada praktyczna
    trwałość
    złożoność
    rozwój zróżnicowany
    Opis:
    Science and engineering intermingle in the area of construction. Engineering works, often of great dimensions and design life cycle of many decades, have to be designed on a scientific basis since the safety of hundreds of users depends on their design. The task of scientific institutions is to define the construction performance within categories that correspond to the contemporary level of knowledge and technology. A construction appraiser who speaks out in a way that ensures unquestionable competence about the performance of elements and buildings (existing and under construction), should be convinced of the scientific basis of his opinions. A comparison of construction sections vs. basic requirements presents an archetype of the science of construction. A matrix of the science of construction reveals its multi-faceted nature; if related to time – the issue of durability has to be considered, and if related to the scale – the complexity. Defining the construction performance in terms of technical features is a constant search for a relationship between the material model and the usability model of a building. The construction industry uses a lot of “rules of thumb”, more than any other sector of technology. In the era of computer-aided design, CAD, and building information modelling (BIM), those rules of thumb remain invaluable verification tools.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 4; 665--673
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of stress based NDT methods for concrete repair bond quality control
    Autorzy:
    Garbacz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/200925.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    concrete structure
    repair durability
    repair quality control
    NDT techniques
    substrate quality
    interface quality
    struktura betonu
    naprawy kontroli jakości
    techniki badań nieniszczących
    jakość podłoża
    interfejs podłoża
    Opis:
    Adhesion in repair systems is one of the most important factors affecting their durability. Elaboration of a reliable nondestructive test method to perform an adhesion mapping is one of the most important tasks. A majority of NDT methods applicable for the assessment of concrete structures are based on the propagation of various types of stress waves. In this paper, the influence of the repair material type (polymer-cement or polymer) and quality of the concrete substrate (roughness, microcracking, not cleaned surface) upon propagation of stress waves in a repair system was studied in view of developing a reliable NDT procedure for the field assessment of bond quality in concrete repairs.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 1; 77-85
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the pavement performance
    Autorzy:
    Iwański, M.
    Chomicz-Kowalska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/202404.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Marshall hammer
    hydraulic press
    road base
    full-depth cold recycling technology
    foamed bitumen
    bitumen emulsion
    durability
    resistance to moisture damage
    diagnosis
    ubijak Marshalla
    prasy hydrauliczne
    technologia recyklingu pełnej głębokości na zimno
    asfalt spieniony
    bitumiczna emulsja
    trwałość
    odporność na uszkodzenia wilgoci
    diagnoza
    Opis:
    This paper focuses on evaluation of two laboratory-based methods of compaction of foamed bitumen and bitumen emulsion mixes: impact compaction with a Marshall hammer and static compaction using a hydraulic press. The investigated compaction methods were assessed in terms of their impact on the physical and mechanical properties of produced laboratory specimens, including: air void content, indirect tensile strength before and after conditioning in water (ITSdry, ITSwet), tensile strength ratio (TSR), and indirect tensile stiffness modulus (ITSM) at 0°C, 10°C and 20°C. The statically compacted specimens attained higher levels of mechanical properties and resistance to moisture damage, which was associated with a lower content of air voids in the specimens formed using a hydraulic press. Authors present a calculation showing that a mechanistic design based on the laboratory static press compaction method leads to overestimation of fatigue cracking resistance of the road base.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 1; 97-105
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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