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    Wyświetlanie 1-7 z 7
    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:
    Analysis of the Thermal and Magnetic Properties of Amorphous Fe61Co10Zr2.5Hf2.5Me2W2B20 (Where Me = Mo, Nb, Ni Or Y) Ribbons
    Autorzy:
    Gruszka, K.
    Nabiałek, M.
    Szota, M.
    Bloch, K.
    Gondro, J.
    Pietrusiewicz, P.
    Sandu, A. V.
    Mustafa Al Bakri, A. M.
    Walters, K.
    Walters, S.
    Garus, S.
    Dośpiał, M.
    Mizera, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/355886.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermal stability
    magnetic properties
    Opis:
    The paper presents the results of structural and magnetic properties and thermal stability for a group of functional materials based on Fe61Co10Zr2.5Hf2.5Me2W2B20 (where Me = Mo, Nb, Ni or Y). Samples were obtained in the form of ribbons using melt-spinning method. The X-ray diffraction patterns of investigated samples confirmed their amorphous structure. Based on the analysis of DSC curves characteristic temperatures: glass forming temperature (Tg), crystallization temperature (Tx) and temperature range of the supercooled liquid ΔTx were determined. Small addition of transition metals elements has strong influence on magnetic and thermal parameters of studied materials. The comprehensive studies revealed that in terms of magnetic properties the Ni-addition resulted in highest reduction in coercivity and anisotropy field.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 641-644
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Zeolite Phase Made from Rice Husk Ash and Sidrap Clay
    Autorzy:
    Armayani, M.
    Mansur, Musdalifa
    Asra, Reza
    Irwan, Muh
    Ramadhanty, Dhian
    Subaer, Subaer
    Abdullah, Mohd Mustafa Al Bakri
    Aziz, Ikmal Hakem A.
    Jeż, Bartłomiej
    Nabiałek, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/2203746.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    autoclave
    clay
    rice husk ash
    zeolite
    Opis:
    Zeolite has been successfully synthesized from clay and rice husk ash in the form of powder by using the hydrothermal method with variations in chemical compositions of alkaline solution and the amount of rice husk ash. The clay raw material was obtained from the Sidrap area of South Sulawesi and rice husk ash is obtained from the burning pile of rice husks. Sidrap clay and rice husk ash were activated using an alkaline solution of NaOH and varied rice husk ash and the addition of AlCl3. The addition of AlCl3, an alkaline solution of NaOH and H2O was used in the amount of 25.5 grams and variations of rice husk ash were 2.5 grams and 6.5 grams. Meanwhile, without the addition of AlCl3, an alkaline solution of NaOH and H2O was used for 20.5 grams and variations of rice husk ash from 2.5 grams and 6.5 grams. Then the mixture was then put into an autoclave with a temperature of 100°C for 3 hours. The basic material used in the manufacture of zeolite is carried out by X-ray Fluorescence (XRF) characterization to determine the constituent elements of basic material, which showed the content of SiO2 was 45.80 wt% in the clay and 93.40% in the rice husk ash. The crystalline structure of the zeolite formed was characterized by X-Ray Diffraction (XRD). It was found the resulting zeolite were identified as Zeolite-Y, Hydrosodalite, and ZSM-5. The microstructure properties of the resulting zeolite were determined by using Scanning Electron Microscopy (SEM).
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 269--274
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Silica Bonding Reaction on Fly Ash Based Geopolymer Repair Material System with Incorporation of Various Concrete Substrates
    Autorzy:
    Al Bakri Abdullah, Mohd Mustafa
    Aziz, Ikmal Hakem A.
    Zailani, Warid Wazien Ahmad
    Rahim, Shayfull Zamree Abd
    Yong, Heah Cheng
    Sandu, Andrei Victor
    Peng, Loke Siu
    Powiązania:
    https://bibliotekanauki.pl/articles/2174557.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fly ash geopolymer
    repair material
    concrete substrate
    interfacial zone transition
    Opis:
    This paper presents an experimental investigation on the mechanical properties and microstructure of geopolymer repair materials mixed using fly ash (FA) and concrete substrates. An optimal combination of FA and concrete substrate was determined using the compressive test of geopolymer mortar mixed with various concrete substrate classes. It was found that the contribution of (C35/45) concrete substrates with the FA geopolymer mortar increases the 28-day bonding strength by 25.74 MPa. The microstructure analysis of the samples using scanning electron microscopy showed the denser structure owing to the availability of high calcium and iron elements distribution. These metal cations (Ca2+ and Fe3+) are available at OPC concrete substrate as a result from the hydration process reacted with alumina-silica sources of FA and formed calcium aluminate silicate hydrate (C-A-S-H) gels and Fe-bonding linkages.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1277--1281
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Finite Element Analysis on Structural Behaviour of Geopolymer Reinforced Concrete Beam using Johnson-Cook Damage in ABAQUS
    Autorzy:
    Mortar, Nurul Aida Mohd
    Al Bakri Abdullah, Mohd Mustafa
    Hussin, Kamarudin
    Razak, Rafiza Abdul
    Hamat, Sanusi
    Hilmi, Ahmad Humaizi
    Shahedan, Noorfifi Natasha
    Li, Long Yuan
    Aziz, Ikmal Hakem A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2174588.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fly ash geopolymer
    geopolymer concrete
    finite element analysis
    Johnson Cook Damage
    ABAQUS software
    Opis:
    This paper details a finite element analysis of the behaviour of Si-Al geopolymer concrete beam reinforced steel bar under an impulsive load and hyper velocity speed up to 1 km/s created by an air blast explosion. The initial torsion stiffness and ultimate torsion strength of the beam increased with increasing compressive strength and decreasing stirrup ratio. The study involves building a finite element model to detail the stress distribution and compute the level of damage, displacement, and cracks development on the geopolymer concrete reinforcement beam. This was done in ABAQUS, where a computational model of the finite element was used to determine the elasticity, plasticity, concrete tension damages, concrete damage plasticity, and the viability of the Johnson-Cook Damage method on the Si-Al geopolymer concrete. The results from the numerical simulation show that an increase in the load magnitude at the midspan of the beam leads to a percentage increase in the ultimate damage of the reinforced geopolymer beams failing in shear plastic deformation. The correlation between the numerical and experimental blasting results confirmed that the damage pattern accurately predicts the response of the steel reinforcement Si-Al geopolymer concrete beams, concluded that decreasing the scaled distance from 0.298 kg/m3 to 0.149 kg/m3 increased the deformation percentage.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1349--1354
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of SnO2/TiO2 with the Addition of Polyethylene Glycol via Sol-Gel Method for Self-Cleaning Application
    Autorzy:
    Halin, Dewi Suriyani Che
    Azliza, Azani
    Razak, Kamrosni Abdul
    Abdullah, Mohd Mustafa Al Bakri
    Salleh, Mohd Arif Anuar Mohd
    Wahab, Juyana A
    Chobpattana, Varistha
    Kaczmarek, Łukasz
    Nabiałek, Marcin
    Jeż, Bartłomiej
    Powiązania:
    https://bibliotekanauki.pl/articles/2203743.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    TiO2
    SnO2
    thin film
    polyethylene glycol
    self-cleaning
    Opis:
    TiO2 is one of the most widely used metal oxide semiconductors in the field of photocatalysis for the self-cleaning purpose to withdraw pollutants. Polyethylene glycol (PEG) is recommended as a stabilizer and booster during preparation of water-soluble TiO2. Preparation of SnO2/TiO2 thin film deposition on the surface of ceramic tile was carried out by the sol-gel spin coating method by adding different amount of PEG (0g, 0.2g, 0.4g, 0.6g, 0.8g) during the preparation of the sol precursor. The effects of PEG content and the annealing temperature on the phase composition, crystallite size and the hydrophilic properties of SnO2/TiO2 films were studied. The X-ray diffraction (XRD) spectra revealed different phases existed when the films were annealed at different annealing temperatures of 350°C, 550°C and 750°C with 0.4 g of PEG addition. The crystallite sizes of the films were measured using Scherrer equation. It shows crystallite size was dependent on crystal structure existed in the films. The films with mixed phases of brookite and rutile shows the smallest crystallite size. In order to measure the hydrophilicity properties of films, the water contact angles for each film with different content of PEG were measured. It can be observed that the water contact angle decreased with the increasing of the content of PEG. It shows the superhydrophilicity properties for the films with the 0.8 g of PEG annealed at 750°C. This demonstrates that the annealed temperature and the addition of PEG affect the phase composition and the hydrophilicity properties of the films.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 243--248
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Insulation and Mechanical Properties in the Presence of Glas Bubble in Fly Ash Geopolymer Paste
    Autorzy:
    Shahedan, Noor Fifinatasha
    Abdullah, Mohd Mustafa Al Bakri
    Mahmed, Norsuria
    Liew, Yun Ming
    Shayfull, Zamree Abd Rahim
    Aziz, Ikmal Hakem A.
    Kadir, Aeslina Abdul
    Sandu, Andrei Victor
    Ghazali, Mohd Fathullah
    Powiązania:
    https://bibliotekanauki.pl/articles/2048833.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    glass bubble
    thermal insulation
    geopolymers
    fly ash
    Opis:
    The density, compressive strength, and thermal insulation properties of fly ash geopolymer paste are reported. Novel insulation material of glass bubble was used as a replacement of fly ash binder to significantly enhance the mechanical and thermal properties compared to the geopolymer paste. The results showed that the density and compressive strength of 50% glass bubble was 1.45 g/cm3 and 42.5 MPa, respectively, meeting the standard requirement for structural concrete. Meanwhile, the compatibility of 50% glass bubbles tested showed that the thermal conductivity (0.898 W/mK), specific heat (2.141 MJ/m3 K), and thermal diffusivity (0.572 mm2 /s) in meeting the same requirement. The improvement of thermal insulation properties revealed the potential use of glass bubbles as an insulation material in construction material.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 1; 221-226
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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