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    Tytuł:
    Mechanical properties of lightweight expanded clay aggregate (LECA) concrete
    Autorzy:
    Issa, Atheer S.
    Al-Asadi, Ali K.
    Powiązania:
    https://bibliotekanauki.pl/articles/35562615.pdf
    Data publikacji:
    2022
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    lightweight concrete
    mechanical properties
    lightweight expanded clay aggregate
    LECA concrete
    Opis:
    The construction activities are based on structural concrete, which is one of the most commonly used materials. The fundamental aim of using lightweight concrete (LWC) was to reduce the concrete self-weight of the structure parts. As a result, LWC has been used successfully in a variety of installations for several years. In this paper, the mechanical properties of concrete made with lightweight expanded clay aggregate (LECA) as a full replacement for coarse aggregate are studied. The experimental program shows that LECA with a 32 MPa cube compressive strength and an 1,823 kg×m–3 dry density can be used to make structural light-weight aggregate concrete (SLWC). The results show that the reduction in the strength of lightweight aggregate concrete (LWAC) was found to be higher in the concrete with an estimated compressive strength of 32 MPa due to the lower strength of the LWA (expanded clay). According to the test results, the mechanical properties of LWC were greatly improved by adding silica fume (SF). Furthermore, LECA concrete has a splitting tensile strength that is 47% higher than the ASTM C330/C330M-17A minimum requirement. The LECA concrete has a splitting tensile strength to compressive strength ratio of approximately 13%. Additionally, the results demonstrate a 27% difference in the modulus of elasticity between the calculated and tested values.
    Źródło:
    Scientific Review Engineering and Environmental Sciences; 2022, 31, 3; 161-175
    1732-9353
    Pojawia się w:
    Scientific Review Engineering and Environmental Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficiency of wastewater purification in medium sand with a lightweight expanded clay aggregate assisting layer
    Autorzy:
    Kalenik, Marek
    Wichowski, Piotr
    Chalecki, Marek
    Kiczko, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/27312642.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    domestic wastewater infiltration drainage
    domestic wastewater purification
    individual wastewater treatment plant
    individual WWTP
    lightweight expanded clay aggregate
    LECA
    soil bed
    Opis:
    The objective of this experimental study was to examine whether an assisting layer of lightweight expanded clay aggregate (LECA) of the granulation 1-4 mm, introduced into a subsoil, is able to improve an efficiency of removal of total nitrogen and total phosphorus from domestic wastewater. In the investigations, an assisting 0.10 and 0.20 m thick LECA layer was applied. It has been observed that the effectiveness of removal of total suspended solids (TSS), total nitrogen and total phosphorus from wastewater as well as the level of biochemical oxygen demand (BOD5 ) and chemical oxygen demand (COD) is in accordance with the Polish standards on wastewater disposal into grounds and surface water. The performed experiments showed that the effectiveness of raw wastewater purification for the medium sand soil bed with the 0.20 m thick assisting LECA layer is higher than for the 0.10 m thick assisting layer. In the medium sand soil bed with the 0.20 m thick assisting LECA layer, the removal efficiency regarding total nitrogen increased by 20.6%, total phosphorus by 5.2%, ammonium nitrogen by 8.8% and TSS by 5.3%, and reduction efficiency regarding BOD5 increased by 1.7% and COD by 2.3% with relation to the 0.10 m thick assisting LECA layer (all percentages - in average). The results of the experiment showed that the LECA with the granulation 1-4 mm can be used to assist in removal of total nitrogen and total phosphorus from wastewater with application of infiltration drainage.
    Źródło:
    Journal of Water and Land Development; 2023, 57; 30--38
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Determination of Optimum Mixture Design of Lightweight Concrete
    Eksperymentalne określanie optymalnego projektu betonu lekkiego
    Autorzy:
    Katzer, Jacek
    Kobaka, Janusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1811742.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    lightweight aggregate
    expanded clay granules
    lightweight concrete
    properties
    research testing
    kruszywo lekkie
    keramzyt
    beton lekki
    właściwości
    badania
    Opis:
    This paper describes the mixture design of lightweight concrete. The authors proposed lightweight concrete based solely on expanded clay aggregate. Commercially available expanded clay granules (used as coarse aggregate) were supplemented with crushed expanded clay granules (which played the role of fine aggregate). The created mixes were differentiated by particle size distribution of lightweight aggregate and the amount of used cement. Properties of both fresh concrete mixes and hardened composites were of interest. The tested properties were as follows: consistency, density, compression strength, splitting tensile strength, dynamic modulus of elasticity, flexural strength, shear strength and abrasion resistance. Experimental results have shown some satisfactory mechanical characteristics of concretes in question.
    Artykuł opisuje projektowanie betonu lekkiego. Autorzy zaproponowali projekt betonu lekkiego wykonanego wyłącznie na bazie kruszywa keramzytowego. Dostępne na rynku kruszywo keramzytowe (użyte jako kruszywo grube) uzupełniono pokruszonym kruszywem tego samego rodzaju (pełniącego rolę kruszywa drobnego). Utworzone mieszanki kruszyw różniły się uziarnieniem kruszyw i zawartością cementu. Zbadano właściwości zarówno świeżej mieszanki betonowej jak i stwardniałego betonu takie jak: konsystencja, gęstość, wytrzymałość na ściskanie, wytrzymałość na rozciąganie przy rozłupywaniu, dynamiczny moduł sprężystości, wytrzymałość na rozciąganie przy zginaniu, wytrzymałość na ścinanie i odporność na ścieranie. Wyniki badań eksperymentalnych wykazały zadowalającą charakterystykę zbadanych właściwości.
    Źródło:
    Rocznik Ochrona Środowiska; 2020, Tom 22, cz. 2; 781-790
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of the pre-wetting of expanded clay aggregate on the freeze-thaw resistance of the expanded clay aggregate concrete
    Autorzy:
    Musiał, Michał Piotr
    Grzymski, Filip
    Trapko, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1845171.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    lightweight concrete
    freeze-thaw resistance
    aggregate pre-wetting
    Opis:
    This paper presents experimental research on expanded clay aggregate concrete. The aim of the investigations was to determine if the pre-wetting of expanded clay aggregate has an effect on the freeze-thaw durability of the expanded clay aggregate concrete. Five concrete series based on the same concrete mix design were made and tested. The degree of pre-wetting of the aggregate was varied: dry aggregate was used in the first series, aggregate with a moisture content of 10% was used in series IA and IB and aggregate with a moisture content of 25% was used in series IIA and IIB. Also the approach to the production process was varied: in series A the water contained in the aggregate was taken into account in the global water-cement ratio (consequently a reduced amount of water was added to the mix), whereas in series B the nominal amount of water was added to the mix (as in the case of dry aggregate). The freeze-thaw resistance criterion was based on the assessment of the decrease of compressive strength and increase in weight loss after exposure to freeze-thaw cycles. The expanded clay aggregate concrete’s strength and mass decrements caused by freeze-thaw cycling were used as the measure of its freeze-thaw resistance. The investigations have shown that the pre-wetting of expanded clay aggregate has an effect on the freeze-thaw durability of the expanded clay aggregate concrete. The differences of concrete compressive strength decrease related to freezethaw durability may be 2 to 5 times greater when inadequate method of calculating mixing water for concrete is used.
    Źródło:
    Studia Geotechnica et Mechanica; 2021, 43, 2; 65-73
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Manufacture of Clay Aggregate Doped with Pozzolan Destined for Lightweight Concrete
    Autorzy:
    Mesrar, Hamza
    Mesrar, Laila
    Touache, Abdelhamid
    Jabrane, Raouf
    Powiązania:
    https://bibliotekanauki.pl/articles/2202348.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    marl
    pozzolan
    density
    expanded clay aggregate
    concrete
    mechanical resistance
    Opis:
    In this work, marl clay was used because these materials have a very important industrial potentiality in several fields, namely ceramics. The objective was manufacturing expanded clay aggregate (ECA), with two main ingredients of marl and pozzolan at different percentages in order to integrate them into the concrete as aggregate. The physicochemical parameters of the mixture marl / Pozzolan was discussed and the results of the analyses, allowed deducing that the sample with 15% pozzolan has the most expansion rate of 16.8%, and its density of 1232 kg/m3 is in accordance with the international standard of expanded aggregates. The density of the concrete decreases with the quantity of ECA added and reaches its minimum with 1671 kg/m3 according to concrete with 50% of the expanded aggregate. The bending tests show the increase of the mechanical strength as a function of the quantities of aggregate added. The results show a very important potential with the addition of clay aggregates, density and water absorption decrease with the increase of the mechanical resistance.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 1; 349--359
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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