Journal Articles

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https://hdl.handle.net/20.500.14170/1585

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Browsing Journal Articles by Author "Aeslina Abdul Kadir"
  • Publication
    Mechanical and durability analysis of fly ash based geopolymer with various compositions for rigid pavement applications
    ( 2022)
    Muhammad Faheem Mohd. Tahir
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Shayfull Zamree Abd. Rahim
    ;
    Mohd Rosli Mohd Hasan
    ;
    Andrei Victor Sandu
    ;
    Petrica Vizureanu
    ;
    Che Mohd Ruzaidi Ghazali
    ;
    Aeslina Abdul Kadir
    Ordinary Portland cement (OPC) is a conventional material used to construct rigid pavement that emits large amounts of carbon dioxide (CO2) during its manufacturing process, which is bad for the environment. It is also claimed that OPC is susceptible to acid attack, which increases the maintenance cost of rigid pavement. Therefore, a fly ash based geopolymer is proposed as a material for rigid pavement application as it releases lesser amounts of CO2 during the synthesis process and has higher acid resistance compared to OPC. This current study optimizes the formulation to produce fly ash based geopolymer with the highest compressive strength. In addition, the durability of fly ash based geopolymer concrete and OPC concrete in an acidic environment is also determined and compared. The results show that the optimum value of sodium hydroxide concentration, the ratio of sodium silicate to sodium hydroxide, and the ratio of solid-to-liquid for fly ash based geopolymer are 10 M, 2.0, and 2.5, respectively, with a maximum compressive strength of 47 MPa. The results also highlight that the durability of fly ash based geopolymer is higher than that of OPC concrete, indicating that fly ash based geopolymer is a better material for rigid pavement applications, with a percentage of compressive strength loss of 7.38% to 21.94% for OPC concrete. This current study contributes to the field of knowledge by providing a reference for future development of fly ash based geopolymer for rigid pavement applications.
  • Publication
    Thermal insulation and mechanical properties in the presence of glas bubble in fly ash geopolymer paste
    ( 2021)
    Noor Fifinatasha Shahedan
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Norsuria Mahmed
    ;
    Liew Yun Ming
    ;
    Shayfull Zamree Abd. Rahim
    ;
    Ikmal Hakem A Aziz
    ;
    Aeslina Abdul Kadir
    ;
    Andrei Victor Sandu
    ;
    Mohd Fathullah Ghazli@Ghazali
    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/ ely, 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
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