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    Wyświetlanie 1-3 z 3
    Tytuł:
    Effect of Solid-To-Liquids and Na2SiO3-To-NaOH Ratio on Metakaolin Membrane Geopolymers
    Autorzy:
    Ibrahim, Masdiyana
    Wan Ibrahim, Wan Mastura
    Al Bakri Abdullah, Mohd Mustafa
    Sauffi, Ahmad Syauqi
    Vizureanu, Petrica
    Powiązania:
    https://bibliotekanauki.pl/articles/2106597.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    geopolymer
    metakaolin membrane
    porous geopolymer
    solid-to-liquid (S/L) ratio
    Na2SiO3/NaOH ratio
    Opis:
    Geopolymer is synthesized by polycondensation of SiO4 and AlO4 aluminosilicate complexes, tetrahedral frames linked with shared sialate oxygen. This paper studies the effect of the solids-to-fluids (S/L) and Na2SiO3/NaOH proportions on the preparing of metakaolin inorganic membrane geopolymer. By consolidating a mixture of metakaolin with sodium hydroxide, sodium silicate and foaming agent, the geopolymer membrane was made in required shape about 1 cm and cured at 80°C for 24 hours. After the curing process, the properties of the samples were tested on days 7. Sodium silicate (Na2SiO32SiO3
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 2; 695--702
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of Geopolymer Concrete for Underwater Concreting Properties
    Autorzy:
    Zaidi, Fakhryna Hannanee Ahmad
    Ahmad, Romisuhani
    Al Bakri Abdullah, Mohd Mustafa
    Wan Ibrahim, Wan Mastura
    Aziz, Ikmal Hakem
    Junaidi, Subaer
    Luhar, Salmabanu
    Powiązania:
    https://bibliotekanauki.pl/articles/2106595.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    geopolymer
    underwater concrete
    fly ash
    kaolin
    Opis:
    For ages, concrete has been used to construct underwater structures. Concrete laying underwater is a very complex procedure important to the success or failure of underwater projects. This paper elucidates the influence of alkali activator ratios on geopolymers for underwater concreting; focusing on the geopolymer concrete synthesized from fly ash and kaolin activated using sodium hydroxide and sodium silicate solutions. The geopolymer mixtures were designed to incorporate multiple alkali activator ratios to evaluate their effects on the resulting geopolymers’ properties. The fresh concrete was molded into 50 mm cubes in seawater using the tremie method and tested for its engineering properties at 7 and 28 days (curing). The control geopolymer and underwater geopolymers’ mechanical properties, such as compressive strength, water absorption density, and setting time were also determined. The differences between the control geopolymer and underwater geopolymer were determined using phase analysis and functional group analysis. The results show that the geopolymer samples were optimally strengthened at a 2.5 alkali activator ratio, and the mechanical properties of the control geopolymer exceeded that of the underwater geopolymer. However, the underwater geopolymer was determined to be suitable for use as underwater concreting material as it retains 70% strength of the control geopolymer.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 2; 677--684
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Analysis of Different Liquid Ratio on Metakaolin/Dolomite Geopolymer
    Autorzy:
    Syauqi Sauffi, Ahmad
    Wan Mastura, Wan Ibrahim
    Mohd Mustafa Al Bakri, Abdullah
    Ibrahim, Masdiyana
    Ahmad, Romisuhani
    Ahmad Zaidi, Fakhryna
    Powiązania:
    https://bibliotekanauki.pl/articles/2048822.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    geopolymer
    metakaolin
    dolomite
    phase analysis
    Opis:
    Geopolymer is widely studied nowadays in various scope of studies. Some of the ongoing studies are the study of the various materials towards the geopolymer strength produced. Meanwhile, some of the studies focus on the mixing of the geopolymer itself. This paper discussed the phase analysis of metakaolin/dolomite geopolymer for different solid to the liquid ratio which was, 0.4, 0.6, 0.8, and 1.0, and the properties that affected the geopolymer based on the phases. The constant parameters in this study were the percentage of metakaolin and dolomite used. The metakaolin used was 80% meanwhile dolomite usage was 20%. Besides that, the molarity of NaOH used is 10M and the alkaline activator ratio used is 2.0. All the samples were tested at 28 days of curing. The results show that the 0.8 solid to the liquid ratio used gave better properties compare to other solid to liquid ratio. The phases analyzed were quartz, sillimanite, mullite, and faujasite. The 0.8 S/L ratio shows the better properties compared to others by the test of phase analysis, compressive strength morphology analysis, and functional group analysis.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 1; 247-250
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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