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    Wyświetlanie 1-3 z 3
    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:
    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
    Tytuł:
    Crumb rubber geopolymer mortar at elevated temperature exposure
    Autorzy:
    Azmi, Ahmad Azrem
    Abdullah, Mohd Mustafa Al Bakri
    Ghazali, Che Mohd Ruzaidi
    Ahmad, Romisuhani
    Jaya, Ramadhansyah Putra
    Rahim, Shayfull Zamree Abd
    Almadani, Mohammad A.
    Wysłocki, Jerzy J.
    Śliwa, Agata
    Sandu, Andrei Victor
    Powiązania:
    https://bibliotekanauki.pl/articles/2173997.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    popiół lotny
    zaprawa geopolimerowa
    okruchy gumy
    temperatura podwyższona
    narażenie
    fly ash
    geopolymer mortar
    crumb rubber
    elevated temperature
    exposure
    Opis:
    Low calcium fly ash is used as the main material in the mixture and the crumb rubber was used in replacing fine aggregates in geopolymer mortar. Sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) which were high alkaline solution were incorporated as the alkaline solution. The fly ash reacted with the alkaline solution forming alumino-silicate gel that binds the aggregate to produce a geopolymer mortar. The loading of crumb rubber in the fly ash based geopolymer mortar was set at 0% (CRGM-0), 5% (CRGM-5), 10% (CRGM-10), 15% (CRGM-15), and 20% (CRGM-20), respectively. NaOH solution (12M) and Na2SiO3 solution ratio is set constant at 2.5 for all geopolymer mixture and the fly ash to alkali activator ratio was kept at 2.0. The CRGM at 28 days of curing time was exposed to elevated temperature at 200ºC, 400ºC, 600ºC and 800ºC. The weight loss of the CRGM increases with increasing temperature at all elevated temperatures. However, the density and compressive strength of CRGM decrease with an increase of crumb rubber loading for all elevated temperature exposure. The compressive strength of CRGM reduced due to the fact that rubber decomposes between 200ºC and 600ºC thereby creating voids. CRGM-15 and CRGM-20 showed cracks developed with rough surface at 800ºC. Image obtained from scanning electron microscope (SEM) showed that, the CRGM changed significantly due to the decomposition of crumb rubber and evaporation of the free water at 400ºC, 600ºC and 800ºC.
    Źródło:
    Archives of Civil Engineering; 2022, 68, 3; 87--105
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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