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    Wyświetlanie 1-12 z 12
    Tytuł:
    Determination of the strength parameters of pinewood based on the non-destructive sclerometric test with a wood hammer
    Autorzy:
    Szostak, Bartosz
    Trochonowicz, Maciej
    Kowalczyk, Mateusz
    Powiązania:
    https://bibliotekanauki.pl/articles/396645.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    pinewood
    non-destructive tests
    sclerometric test
    compressive strength
    drewno sosnowe
    testy nieniszczące
    testy sklerometryczne
    wytrzymałość na ściskanie
    Opis:
    To assess the technical condition of a structure and design it using existing elements, it is necessary to know its parameters. For existing facilities, it is often not possible to get a sample of material and examine it directly in the laboratory. For this reason, in situ nondestructive testing is very important. The main goal of the paper is to present the issues related to determining the strength parameters of a particular wood based on the non-destructive sclerometric test performed with a wood sclerometric hammer. The study also presents the results of the impact of pinewood density on its compressive strength.
    Źródło:
    Civil and Environmental Engineering Reports; 2020, 30, 1; 43-52
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aggregate Type Influence on Microstructural Behavior of Concrete Exposed to Elevated Temperature
    Autorzy:
    Belkadi, Ahmed Abderraouf
    Kessal, Oussama
    Bensalem, Sara
    Aggoun, Salima
    Amouri, Chahinez
    Khouadjia, Mohamed Lyes Kamel
    Powiązania:
    https://bibliotekanauki.pl/articles/27314710.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    types of aggregates
    high temperature
    compressive strength
    microstructure
    mercury porosimeter
    kruszywo
    temperatura wysoka
    wytrzymałość na ściskanie
    mikrostruktura
    porozymetr rtęciowy
    Opis:
    Exposure of concrete to high temperatures affects its mechanical properties by reducing the compressive strength, bending… etc. Factors reducing these properties have been focused on by several studies over the years, producing conflicting results. This article interested an important factor, that is the type of aggregates. For this, an experimental study on the behavior of concrete based on different types of aggregates: calcareous, siliceous and silico-calcareous subjected to high temperatures. In addition, the particle size distribution of the aggregates was chosen to be almost identical so that the latter does not affect the behavior of the concrete. Aggregates and concrete samples were subjected to a heating/cooling cycle of 300, 600 and 800°C at a speed of 1°C/ min. The mechanical and physical properties of concrete before and after exposure to high temperatures were studied. In addition, a microstructural study using a scanning electron microscope and a mercury porosimeter was performed. Thus, a comparative study between various researches on the mechanical properties of concrete exposed to high temperatures containing different types of aggregates was carried out. The compressive strength test results showed that the concrete based on siliceous aggregates (C-S) has better mechanical performance up to 300°C. However, above 300°C, the compressive strength decreases faster compared to calcareous-based concrete (C-C). According to the mercury porosimeter test, at 600°C, C-SC and C-S concretes have the highest number of pores compared to C-C concretes. The microstructure of concrete at high temperatures was influenced mainly by the aggregate’s types and the paste-aggregate transition zone. This study reinforces the importance of standardizing test procedures related to the properties of concrete in a fire situation so that all the results obtained are reproducible and applicable in other research.
    Źródło:
    Civil and Environmental Engineering Reports; 2022, 32, 1; 19--42
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental investigation of cementitious materials using the prism technique
    Autorzy:
    Messaoudi, Rahma
    Bouzerira, Cherif
    Grimes, Morad
    Oucief, Hocine
    Powiązania:
    https://bibliotekanauki.pl/articles/396269.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    prism technique
    cementitious material
    compressional wave
    shear wave
    reflection coefficient
    technika pryzmatyczna
    materiał cementowy
    ściskanie
    fala uderzeniowa
    współczynnik odbicia
    Opis:
    Numerous studies have shown that the non-destructive testing has proved the exceptional role in supervising the quality of concrete. Today, they represent an alternative that contributes to the resolution of materials diagnostic problems without altering them. This work presents an experimental study using a pulse-echo method that has the advantage of generating two types of wave (compressional and shear) by a mode conversion using just one transducer. The samples were made in a prismatic form. The results recovered from backscattered echoes are extracted using an estimation algorithm. These data were exploited to determine velocities of the tested material then the reflection coefficients for related them with the compressive strength. The tests were conducted with six samples with varied water/cement ratio. The results obtained showed that the prism technique has the potential to evaluate characteristics cementitious material using this proposed process.
    Źródło:
    Civil and Environmental Engineering Reports; 2020, 30, 1; 196-212
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of steel fibres on fresh and hardened properties of cement concrete
    Autorzy:
    Ali, Saqib
    Kumar, Haresh
    Rizvi, Samar Hussain
    Raza, Muhammad Saleem
    Ansari, Jawaid Kamal
    Powiązania:
    https://bibliotekanauki.pl/articles/395745.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    cement concrete
    steel fibres
    compressive strength
    tensile strength
    workability
    beton cementowy
    włókna stalowe
    wytrzymałość na ściskanie
    wytrzymałość na rozciąganie
    urabialność
    Opis:
    Concrete possesses distinct features that make it widely acceptable for use across the globe; however, along with its obvious benefits, it has numerous drawbacks i.e., it is brittle in nature and its production causes an adverse impact on the environment. To counter such problems, researchers around the world have introduced sustainable measures. Fibre addition is foremost among these solutions in that it prevents crack propagation and increases the overall strength of concrete. In the present age, civil engineering structures have their own structural and durability requirements and so, modification in traditional concrete has become a necessity. This research is targeted at steel fibre reinforced concrete (SFRC), which is a superior quality concrete because of its enhanced strength. The steel fibres are obtained from binding wire that is used to tie the steel reinforcement. By referring to past research, steel fibres with an aspect ratio (length to diameter ratio) of 30 were considered favourable. The controlled, mixed design of the concrete was prepared with a targeted strength of 4000 psi and, while mixing the concrete ingredients, fibres were added to allow uniform dispersion. The fresh and hardened properties of workability, compressive, and tensile strength were tested and the results of fibres at 0%, 1%, 2% and 3% concrete mass were compared and analysed. The results indicated that highest compressive and tensile strength values were achieved with 3% fibre addition. However, with further addition, it was observed that concrete loses its workability. Therefore, it is suggested that 1% addition of steel fibres produces good strength with sufficient workability.
    Źródło:
    Civil and Environmental Engineering Reports; 2020, 30, 3; 186-199
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of water quality on concrete mix and hardened concrete parameters
    Autorzy:
    Kokoszka, Wanda
    Powiązania:
    https://bibliotekanauki.pl/articles/396095.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    concrete compressive strength
    mixing water
    ready-mixed concrete
    sewage water
    wytrzymałość betonu na ściskanie
    mieszanie wody
    beton towarowy
    woda ściekowa
    Opis:
    The subject of the present article is the evaluation of the use of different water types in the production of concrete mix and C20/25 class concrete (assuming the same composition). Taking as an example a selected Subcarpathia-based concrete production plant, equipped with a process water management system, the research analysed the quantity-quality parameters of drinking water, sewage water, and groundwater and evaluated them for their accordance with mixing-water quality standards. It should be emphasised that the majority of specifications recommend the use of drinking water for concrete production. The paper presents the results of research which analysed the impact of water quality on selected properties of concrete mix and concrete (consistency; compressive strength after 7, 14, and 28 days; density). The results obtained confirmed the findings of the research on the suitability of recycled water for concrete production.
    Źródło:
    Civil and Environmental Engineering Reports; 2019, 29, 3; 174-182
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of rubber waste concrete properties by ultrasonic velocities: effect of transducers’ diameters and frequencies
    Autorzy:
    Boudjedra, Fatiha
    Benouis, Abdelhalim
    Boudaoud, Zineddine
    Powiązania:
    https://bibliotekanauki.pl/articles/1838098.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    rubber tire waste
    rubberized concrete
    compressive strength
    porosity
    ultrasonic pulse velocity
    transducers
    odpady opon
    beton gumowany
    wytrzymałość na ściskanie
    porowatość
    Opis:
    This experimental study aimed to use the ultrasonic pulse velocity method (UPV) in order to investigate the effect of rubber tire waste content and transducers’ diameters and frequencies on the evolution of ultrasonic velocities in time and to elucidate the correlations between UPV and the properties of various concrete mixtures. The incorporation of this waste involved volume substitution (0, 5, 10, 15 and 20%) of fine aggregates (sand) by rubber waste (RW) granulates. The dry unit weight, porosity, compressive and flexural strengths, and velocity of ultrasonic waves with different transducers - which presents the non-destructive technique - were evaluated. Rubberized concrete mixtures showed increases in porosity with lower dry unit weight compared to the control concrete. Compressive strength, flexural strength and ultrasonic velocity obtained by all transducers decreases with increasing RW content. These decreases are not influenced by the curing age of concretes. Decreases in the diameter and frequency of transducers caused reductions in ultrasonic velocity. These reductions are not influenced by the volume replacement of sand by RW. Correlations showed that ultrasonic velocity represents a reliable non-destructive technique for measuring the properties of rubberized concretes.
    Źródło:
    Civil and Environmental Engineering Reports; 2020, 30, 2; 200-220
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Investigation of Self-Compacting Concrete Containing Coir Fibres
    Autorzy:
    Lakhiar, Muhammad Tarque
    Lakhiar, Muhammad Tahir
    Abdullah, Abd Halid
    Mohamad, Noridah
    Powiązania:
    https://bibliotekanauki.pl/articles/2051698.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    self-compacting concrete
    coir fibre
    flow
    compressive strength
    split tensile strength
    beton samozagęszczalny
    włókno kokosowe
    przepływ
    wytrzymałość na ściskanie
    wytrzymałość na rozciąganie
    Opis:
    Many researchers have investigated alternative sources to overcome the problem of conventional building material polluting the environment by the development of green self-compacting concrete in the construction industry. The best alternative solution is to utilise non-conventional construction materials like agricultural wastes. Meanwhile, self-compacting concrete (SCC) is considered as high strength as well as high-performance concrete. The demerits, which include tensile and flexural strength, can be improved by incorporating coir fibres. The utilisation of coir fibres also modifies self-compacting concrete performance after cracking and improves the toughness. This study defines an experimental investigation of the mechanical properties of self-compacting concrete containing coir fibres (CF) with different percentages being 0%, 0.2%, 0.5%, 1%, and 1.5% at 7- and 28-days water curing. The mechanical properties include the slump flow and compressive and tensile strength were examined. The outcomes demonstrated that a required slump flow for self-compacting concrete was achieved using coir fibres up to 1%, beyond which it reduced the slump significantly. The length of fibre and proportion of fibres directly affected the workability. The compressive strength was 10% to 15% enhanced with the incorporation of coir fibres up to 0.5%; after that, the strength was slightly reduced, and tensile strength was 30% to 50% improved compared to conventional self-compacting concrete up to 1% of coir fibres incorporation in the SCC mix, after which it rapidly reduced.
    Źródło:
    Civil and Environmental Engineering Reports; 2021, 31, 2; 163-177
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measuring Equivalent Cohesion Ceq of the Frozen Soils by Compression Strength using Kriolab Equipment
    Autorzy:
    Lemenkov, Vasiliy
    Lemenkova, Polina
    Powiązania:
    https://bibliotekanauki.pl/articles/2051727.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    equivalent cohesion
    modeling
    deformation
    moisture
    pressure
    soils
    geotechnical engineering
    experiment
    data visualization
    pomiar spójności
    gleba
    odkształcenie
    wytrzymałość na ściskanie
    eksperyment
    inżynieria geotechniczna
    Opis:
    Current paper presents the results of the experimental analysis on permafrost uppermost soil samples with various physical properties (moisture, porosity) tested with varied external pressure and time. The aim of this work is to test properties of the soil samples intended for the construction of buildings, railways and objects of civil infrastructure by modeled external pressure, data visualization and analysis. Variations in the soil samples were studied by analysis of the equivalent soil cohesion (Ceq) in frozen soil samples. Methods include integrated application of the laboratory experiments, methods of the statistical data analysis and 3D plotting performed by the selected LaTeX packages. Laboratory experiments were performed using KrioLab equipment ‘Sharikovy Stamp PSH-1’. The 15 series of experiments have been tested. Models of the soil strength are graphically presented and statistically analyzed showing the results of the experiment.
    Źródło:
    Civil and Environmental Engineering Reports; 2021, 31, 2; 63-84
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in the strength of the polymer concrete used in the electroplating vats under operational load
    Autorzy:
    Radna, L.
    Sakharov, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/396168.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    polymer concrete
    electroplating bath
    laboratory test
    compressive
    bending tensile strength
    hardening
    polimerobeton
    wanna elektrolityczna
    badanie laboratoryjne
    ściskanie
    zginanie
    wytrzymałość na rozciąganie
    hartowanie
    Opis:
    Zmiany wytrzymałości betonu polimerowego stosowanego w wannach elektrolitycznych pod obciążeniem technologicznym
    Źródło:
    Civil and Environmental Engineering Reports; 2017, No. 27(4); 185-193
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the fractography and some strength properties of Fe-based sintered materials with multicomponent oxide microadditives
    Autorzy:
    Feldshtein, E.
    Michalski, M.
    Adamczuk, K.
    Dyachkova, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/265617.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    materiały spiekane
    analiza pękania
    wytrzymałość na zginanie
    wytrzymałość na ściskanie
    Fe-based sintered materials
    oxide additives
    fracture analyze
    flexural strength
    compressive strength
    Opis:
    In the present paper, the effect of alumina and zirconia microadditives on the compressive strength and flexural strength of sintered Fe-based powder materials is shown. It was found that intercrystalline fractures, both plastic and brittle, are observed when bending. During compression, fractures are observed too, as well as flaking of thin nearsurface layers. The intensity of such flaking depends on the composition of the sintered material. Strength parameters of the materials studied also depend on additives composition and quantity. The lowest parameters are observed for a material that contains 1% alumina particulates. The compressive strength of a material containing zirconia particulates increases 3 times and the flexural strength 2 times.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2019, 24, 4; 224-229
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Undrained shear and pore space characteristics of treated loose sands with lime-activated zeolite in saturated settings
    Autorzy:
    Jamhiri, Babak
    Pakbaz, Mohammad Siroos
    Powiązania:
    https://bibliotekanauki.pl/articles/1838092.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    lime alkali
    compressive strength
    shear strength
    void ratio
    pore water pressure
    B-ratio
    wapno alkaliczne
    wytrzymałość na ściskanie
    wytrzymałość na ścinanie
    ciśnienie wody
    Opis:
    This research investigates the mechanical behavior of artificially cemented sandy soils formed by lime alkali activation of natural zeolite under saturation settings. In order to verify the bar capability of cemented sands with this new method, an analysis of the undrained shear strength of the soil with pore water pressure ratio measurements was performed from the interpretation of the results of unconfined compression tests. The effect of zeolite-lime blend on treated sands was also visualized by scanning electron microscopy. For the studied soils, it was concluded from the unconfined compression stress values that the soil is fully capable of withstanding compressions due to overburden pressure. Additionally, this study seeks to evaluate the effect of the void ratio on the pore space and undrained shear strength. The results showed that pore water B-ratio increases with the decrease of the void ratio. Moreover, with the increase of zeolite content, confining pressure, and curing age, the peak failure strength increases. The results indicated a promising consistency of treated samples with lime and zeolite under various values of undrained shearing and B-ratios, making this method an ideal treatment for loose sand deposits.
    Źródło:
    Civil and Environmental Engineering Reports; 2020, 30, 2; 105-132
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A consistent Ayrton-Perry approach for the flexural-torsional buckling resistance evaluation of steel i-section members
    Jednolite podejście Ayrton-Perryego w ocenie nośności stalowych elementów dwuteowych przy wyboczeniu giętno-skrętnym
    Autorzy:
    Giżejowski, M.
    Stachura, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/396686.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    eurokody
    metodologia projektowania
    metoda Ayrton-Perry'ego
    dwuteownik stalowy
    zginanie
    ściskanie
    wyboczenie giętno-skrętne
    Eurocode’s design philosophy
    generalized Ayrton-Perry formulation
    steel section
    bending
    buckling resistance
    flexural-torsional buckling
    Opis:
    Steel I-section members subjected to compression a monoaxial bending about the major axis are dealt with in this paper. The current Eurocode’s design procedure of such members is based on a set of two interpolation equations. In this paper a simple and yet consistent Ayrton-Perry methodology is presented that for beam-columns yields the Ayrton-Perry design strategy similar to that utilized in the steel Eurocodes for design of beams and columns but not used so far for the beam-column design. The results from developed design criterion are compared with those of Method 1 of Eurocode 3 and the Ayrton-Perry formulation of a different format that has been recently published.
    Niniejsza praca dotyczy stalowych elementów o przekrojach dwuteowych poddanych osiowemu ściskaniu i jednokierunkowemu zginaniu w płaszczyźnie większej bezwładności przekroju. W takim przypadku procedura projektowania elementów wg aktualnej wersji eurokodu stalowego bazuje na zestawie dwóch interakcyjnych formuł analitycznych, dotyczących nośności elementu oraz zależności interpolacyjnej na nośność przekroju. W odniesieniu do eurokodowego sprawdzania nośności elementów z uwzględnieniem ich stateczności, współczynniki interakcyjne łączące wykorzystanie nośności przy wyboczeniu i zwichrzeniu mogą być wyznaczane wg Metody 1 lub Metody 2. W niniejszym artykule przedstawiono prostą, a jednocześnie spójną metodologię projektowania elementów jednocześnie zginanych i ściskanych, zgodną z podejściem Ayrton-Perry'ego, analogiczną do wykorzystywanej w eurokodzie stalowym do sprawdzania stateczności belek i słupów, ale do tej pory niewykorzystywanej do oceny stateczności elementów jednocześnie zginanych i ściskanych. Wyniki otrzymane z proponowanego w niniejszej pracy podejścia analitycznego porównano z wynikami otrzymanymi z formuł eurokodowych, w których współczynniki interakcyjne wyznaczono Metodą 1 oraz z wynikami otrzymanymi z alternatywnej propozycji analitycznej, bazującej na odmiennym w porównaniu do zaprezentowanego w niniejszym artykule uogólnieniu podejścia Ayrton-Perry'ego.
    Źródło:
    Civil and Environmental Engineering Reports; 2017, No. 25(2); 89-105
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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