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    Wyświetlanie 1-8 z 8
    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:
    Properties and Morphology of Fly Ash Based Alkali Activated Material (AAM) Paste Under Steam Curing Condition
    Autorzy:
    Razak, Rafiza Abd
    Izman, Sharifah Nur Syamimi Syed
    Abdullah, Mohd Mustafa Al Bakri
    Yahya, Zarina
    Abdullah, Alida
    Mohamed, Rosnita
    Powiązania:
    https://bibliotekanauki.pl/articles/28099518.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    alkali activated material
    AAM
    geopolymer
    fly ash
    steam-cured
    high-Fe
    Opis:
    This paper details the properties, microstructures, and morphologies of the fly ash-based alkali-activated material (AAM), also known as geopolymers, under various steam curing temperatures. The steam curing temperature result in subsequent high strengths relative to average curing temperatures. However, detailed studies involving the use of steam curing for AAM remain scarce. The AAM paste was prepared by mixing fly ash with an alkali activator consisting of sodium silicate (Na2SiO3) and sodium hydroxide (NaOH). The sample was steam cured at 50°C, 60°C, 70°C, and 80°C, and the fresh paste was tested for its setting time. The sample also prepared for compressive strength, density, and water absorption testings. It was observed that the fastest time for the fly ash geopolymer to start hardening was at 80°C at only 10 minutes due to the elevated temperature quickening the hydration of the paste. The compressive strength of the AAM increased with increasing curing time from 3 days to 28 days. The AAM’s highest compressive strength was 61 MPa when the sample was steam cured at 50°C for 28 days. The density of AAM was determined to be ~2122 2187 kg/m3, while its water absorption was ~6.72-8.82%. The phase analyses showed the presence of quartz, srebrodolskite, fayalite, and hematite, which indirectly confirms Fe and Ca’s role in the hydration of AAM. The morphology of AAM steam-cured at 50°C showed small amounts of unreacted fly ash and a denser matrix, which resulted in high compressive strength.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 2; 785--789
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Investigation of Ground Granulated Blast Furnace Slag Geopolymer at High Temperature by Using Electron Backscatter Diffraction Analysis
    Autorzy:
    Aziz, Ikmal Hakem
    Mohd Mustafa Al Bakri, Abdullah
    Salleh, Mohd Arif Anuar Mohd
    Yoriya, Sorachon
    Rafiza, Abd Razak
    Mohamed, Rosnita
    Baltatu, Madalina Simona
    Powiązania:
    https://bibliotekanauki.pl/articles/2048835.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    geopolymer
    ground granulated blast furnace slag
    electron backscatter diffraction
    Opis:
    This paper elucidated the potential of electron backscatter diffraction analysis for ground granulated blast furnace slag geopolymers at 1000°C heating temperature. The specimen was prepared through the mechanical ground with sandpaper and diamond pad before polished with diamond suspension. By using advanced technique electron backscatter diffraction, the microstructure analysis and elemental distribution were mapped. The details on the crystalline minerals, including gehlenite, mayenite, tobermorite and calcite were easily traced. Moreover, the experimental Kikuchi diffraction patterns were utilized to generate a self-consistent reference for the electron backscatter diffraction pattern matching. From the electron backscatter diffraction, the locally varying crystal orientation in slag geopolymers sample of monoclinic crystal observed in hedenbergite, orthorhombic crystal in tobermorite and hexagonal crystal in calcite at 1000°C heating temperature.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 1; 227-231
    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
    Tytuł:
    Effect of Sodium Aluminate on the Fresh and Hardened Properties of Fly Ash-Based One-Part Geopolymer
    Autorzy:
    Ooi, Wan-En
    Liew, Yun Ming
    Heah, Cheng Yong
    Ho, Li-Nge
    Abdullah, Mohd Mustafa Al Bakri
    Ong, Shee-Ween
    Sandu, Andrei Victor
    Powiązania:
    https://bibliotekanauki.pl/articles/2106571.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    geopolymer
    one-part geopolymer
    fly ash
    sodium aluminate
    sodium metasilicate
    Opis:
    The one-part geopolymer binder was synthesis from the mixing of aluminosilicate material with solid alkali activators. The properties of one-part geopolymers vary according to the type and amount of solid alkali activators used. This paper presents the effect of various sodium metasilicate-to-sodium aluminate (NaAlO2/Na2SiO3) ratios on fly ash-based one-part geopolymer. The NaAlO2/Na2SiO3 ratios were set at 1.0 to 3.0. Setting time of fresh one-part geopolymer was examined through Vicat needle apparatus. Mechanical and microstructural properties of developed specimens were analysed after 28 days of curing in ambient condition. The study concluded that an increase in NaAlO2 content delayed the setting time of one-part geopolymer paste. The highest compressive strength was achieved at the NaAlO2/Na2SiO3 ratio of 2.5, which was 33.65 MPa. The microstructural analysis revealed a homogeneous structure at the optimum ratio. While the sodium aluminium silicate hydrate (N-A-S-H) and anorthite phases were detected from the XRD analysis.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 2; 441--445
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Naoh Molar Concentration on Microstructure and Compressive Strength of Dolomite/Fly Ash-Based Geopolymers
    Autorzy:
    Azimi, Emy Aizat
    Salleh, Mohd M. A. A.
    Abdullah, Mohd Mustafa Al Bakri
    Aziz, Ikmal Hakem A.
    Hussin, Kamarudin
    Chaiprapa, Jitrin
    Vizureanu, Petrica
    Yoriya, Sorachon
    Nabiałek, Marcin
    Wyslocki, Jerzy J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2125545.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dolomite/fly ash
    geopolymer
    NaOH concentration
    synchrotron
    micro-XRF
    Opis:
    Dolomite can be used as a source of aluminosilicate to produce geopolymers; however, this approach is limited by its low reactivity. This study analyzes the viability of producing geopolymers using dolomite/fly-ash with sodium silicate and NaOH solutions (at multiple concentrations) by determining the resultant geopolymers’ compressive strengths. The dolomite/fly-ash-based geopolymers at a NaOH concentration of ~22 M resulted in an optimum compressive strength of 46.38 MPa after being cured for 28 days, and the SEM and FTIR analyses confirmed the denser surface of the geopolymer matrix. The synchrotron micro-XRF analyses confirmed that the Ca concentration exceeded that of Si and Mg, leading to the formation of calcium silicate hydrate, which strengthens the resulting geopolymers.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 993--998
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Silica Fume and Alumina Addition on the Mechanical and Microstructure of Fly Ash Geopolymer Concrete
    Autorzy:
    Fong, Sue Min
    Heah, Cheng Yong
    Liew, Yun Ming
    Abdullah, Mohd Mustafa Al Bakri
    Hasniyati, Md Razi
    Low, Foo Wah
    Ng, Hui-Teng
    Ng, Yong-Sing
    Powiązania:
    https://bibliotekanauki.pl/articles/2048824.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    geopolymer
    concrete
    silica fume
    alumina
    Opis:
    This paper discussed the effect of the addition of silica fume (2 wt.% and 4 wt.%) and alumina (2 wt.% and 4 wt.%) on the properties of fly ash geopolymer concrete. The fly ash geopolymer concrete achieved the highest 28-day compressive strength with 2 wt.% of silica fume (39 MPa) and 4 wt.% of alumina (41 MPa). The addition of 2 wt.% of silica fume increased the compressive strength by 105% with respect to the reference geopolymer (without additive). On the other hand, the compressive strength surged by 115% with 4 wt.% of alumina compared to the reference geopolymer. The addition of additives improved the compactness of the geopolymer matrix according to the morphology analysis.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 1; 197-202
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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