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    Wyświetlanie 1-7 z 7
    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:
    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:
    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:
    The Use of Waste Ceramic Optimal Concrete for a Cleaner and Sustainable Environment - a Case Study of Mechanical Properties
    Autorzy:
    Najm, Hadee Mahommed
    Ahmad, Shakeel
    Powiązania:
    https://bibliotekanauki.pl/articles/27314798.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    ceramic waste
    concrete
    mechanical performance
    ceramic floor tiles
    strength
    odpady ceramiczne
    beton
    wydajność mechaniczna
    płytki podłogowe ceramiczne
    wytrzymałość
    Opis:
    The present study aims to find out the optimal use of ceramic powder and ceramic aggregate (both fine and coarse) as a possible substitute for Ordinary Portland Cement (OPC 43 grade) and natural aggregate (fine and coarse), respectively, in concrete, where focused on investigating the mechanical properties of waste ceramic concrete. The performance of this modified concrete was evaluated in terms of Compressive Strength (CS), Tensile Strength (TS), Flexural Strength (FS), and Combined Flexural and Torsional strength (FTS) obtained based on various experimental tests conducted on a total of 192 samples (48 cubes, 48 cylinders, 96 beams). The test results showed that ceramic waste material as a partial replacement for natural aggregate, cement, and fine aggregate provides better performance in terms of CS, TS, and FTS at optimal percentages- 20% ceramic aggregate, 10% ceramic powder, and 10% ceramic fine aggregate (Fineness Modulus 2.2) respectively in M25 grade concrete. Using ceramic waste as a partial replacement to prepare concrete has a lot of benefits from the economic, environmental, and technological point of view. Moreover, it offers a possibility for improving concrete's durability, which is vital.
    Źródło:
    Civil and Environmental Engineering Reports; 2022, 32, 3; 85--115
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flexural Strength of Steel-Concrete Composite Beams Under Two-Point Loading
    Autorzy:
    Sangeetha, Palanivelu
    Ramana Gopal, S.
    Jai Vigneshwar, A.
    Vaishnavi, K.
    Srinidhi, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1838063.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    composite beam
    steel-concrete beam
    flexural strength
    decking sheet
    connector
    load
    ANSYS
    belka zespolona
    belka stalowo-betonowa
    złącze
    obciążenie
    odkształcenie
    Opis:
    This study investigates the flexural strength of simply-supported steel–concrete composite beams under two-point loading. A total of four specimens were tested to failure for varying parameters including type of connectors (stud and channel) and number of connectors (two and four). ANSYS software was used to establish the finite element models that can simulate the flexural behaviour of the composite beam. The test results show that a beam with channel connectors performs better than a beam with stud connectors. The composite beam with two connectors between the beam and slab causes additional deflection due to slippage in the connectors, when compared to the beam with four connectors. The results from the analytical model are in good agreement with the experimental results.
    Źródło:
    Civil and Environmental Engineering Reports; 2020, 30, 4; 21-32
    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:
    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
      Wyświetlanie 1-7 z 7

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