Meor Ahmad Faris Meor Ahmad Tajudin
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Meor Ahmad Faris Meor Ahmad Tajudin
Official Name
Meor Ahmad Faris, Meor Ahmad Tajudin
Alternative Name
Faris, Meor Ahmad
Meor, T. A.F.
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Scopus Author ID
57186396600
Researcher ID
AGO-0715-2022

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  • Publication
    Contribution of interfacial bonding towards geopolymers properties in geopolymers reinforced fibers: a review
    ( 2022)
    Muhd Hafizuddin Yazid
    ;
    Meor Ahmad Faris bin Meor Ahmad Tajudin
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Marcin Nabiałek
    ;
    Shayfull Zamree Abd. Rahim
    ;
    Mohd Arif Anuar Mohd Salleh
    ;
    Marwan Kheimi
    ;
    Andrei Victor Sandu
    ;
    Adam Rylski
    ;
    Bartłomiej Jeż
    There is a burgeoning interest in the development of geopolymers as sustainable construction materials and incombustible inorganic polymers. However, geopolymers show quasi-brittle behavior. To overcome this weakness, hundreds of researchers have focused on the development, characterization, and implementation of geopolymer-reinforced fibers for a wide range of applications for light geopolymers concrete. This paper discusses the rapidly developing geopolymer-reinforced fibers, focusing on material and geometrical properties, numerical simulation, and the effect of fibers on the geopolymers. In the section on the effect of fibers on the geopolymers, a comparison between single and hybrid fibers will show the compressive strength and toughness of each type of fiber. It is proposed that interfacial bonding between matrix and fibers is important to obtain better results, and interfacial bonding between matrix and fiber depends on the type of material surface contact area, such as being hydrophobic or hydrophilic, as well as the softness or roughness of the surface.
  • Publication
    Comparison of hook and straight steel fibers addition on malaysian fly ash-based geopolymer concrete on the slump, density, water absorption and mechanical properties
    ( 2021)
    Meor Ahmad Faris bin Meor Ahmad Tajudin
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Ratnasamy Muniandy
    ;
    Mohammad Firdaus Abu Hashim
    ;
    Katarzyna BÅ‚och
    ;
    Bartłomiej Jeż
    ;
    Sebastian Garus
    ;
    Paweł Palutkiewicz
    ;
    Nurul Aida Mohd Mortar
    ;
    Mohd Fathullah Ghazli@Ghazali
    Geopolymer concrete has the potential to replace ordinary Portland cement which can reduce carbon dioxide emission to the environment. The addition of different amounts of steel fibers, as well as different types of end-shape fibers, could alter the performance of geopolymer concrete. The source of aluminosilicate (fly ash) used in the production of geopolymer concrete may lead to a different result. This study focuses on the comparison between Malaysian fly ash geopolymer concrete with the addition of hooked steel fibers and geopolymer concrete with the addition of straight-end steel fibers to the physical and mechanical properties. Malaysian fly ash was first characterized by X-ray fluorescence (XRF) to identify the chemical composition. The sample of steel fiber reinforced geopolymer concrete was produced by mixing fly ash, alkali activators, aggregates, and specific amounts of hook or straight steel fibers. The steel fibers addition for both types of fibers are 0%, 0.5%, 1.0%, 1.5%, and 2.0% by volume percentage. The samples were cured at room temperature. The physical properties (slump, density, and water absorption) of reinforced geopolymer concrete were studied. Meanwhile, a mechanical performance which is compressive, as well as the flexural strength was studied. The results show that the pattern in physical properties of geopolymer concrete for both types of fibers addition is almost similar where the slump is decreased with density and water absorption is increased with the increasing amount of fibers addition. However, the addition of hook steel fiber to the geopolymer concrete produced a lower slump than the addition of straight steel fibers. Meanwhile, the addition of hook steel fiber to the geopolymer concrete shows a higher density and water absorption compared to the sample with the addition of straight steel fibers. However, the difference is not significant. Besides, samples with the addition of hook steel fibers give better performance for compressive and flexural strength compared to the samples with the addition of straight steel fibers where the highest is at 1.0% of fibers addition.
  • Publication
    Optimization of MEH-PPV based single and double-layer TOLED structure by numerical simulation
    ( 2021-12)
    T. Kersenan
    ;
    Nor Farhani Zakaria
    ;
    Safizan Shaari
    ;
    Norhayati Sabani
    ;
    Nurjuliana Juhari
    ;
    Meor Ahmad Faris bin Meor Ahmad Tajudin
    ;
    A.F.A Rahim
    In this work, we simulated and characterized Poly [2-methoxy-5-(2’-ethylhexyloxy)-1, 4-phenylene vinylene] (MEH-PPV) based single and double-layer TOLED by using Silvaco ATLAS device simulator to achieve prominent values of electrical and optical properties of the device. MEH-PPV were used as the emitting layer (EML) in the single-layer, while addition of Poly [(3,4-ethylene dioxythiophene)-poly(styrene sulfonate)] (PEDOT-PSS) as the electron transport layer (ETL) were conducted in double-layer TOLED simulation. The EML and ETL thickness in both structures were varied between 10 – 150 nm, respectively, to observe and understand the underlying physics of the relation in the layer thickness to the electrical and optical characteristics. Furthermore, variation of the EML/ETL thickness ratio from 1:1 to 5:1 (with thickness in between 10 to 50 nm) had also been conducted. From this work, it is understood that the thickness of the EML layer plays the most important role in TOLED, and by balancing the carrier injections and recombination rate in appropriate EML/ETL thickness ratio, the electrical and optical properties can be improved. By optimizing the EML/ETL thickness and thickness ratio, an optimal forward current of 1.41 mA and luminescent power of 1.93e-18 W/μm has been achieved with both MEH-PPV and PEDOT-PSS layer thickness of 10 nm (1:1 ratio), respectively. The results from this work will assist the improvement of TOLED device to be implemented widely in low power and transparent electronic appliances.
  • Publication
    Synthesis and characterization of BaTiO₃ pellets and thin films
    ( 2014)
    Meor Ahmad Faris Meor Ahmad Tajudin
    Barium titanate was synthesized using a solid state approach and an aqueous method. Solid state syntheses were used to prepare barium titanate pellets using a powder metallurgy method. Appropriate amounts of barium carbonate and titanium dioxide powder were mixed together in an agate mortar. Barium titanate pellets were mixed according to 5 different ratios of Ba/Ti which are 1:0.9, 1:0.95, 1:1, 1:1.05, 1:1.1. Pellets were sintered in air at a temperature 1400 °C. Barium titanate thin films were prepared using an aqueous method. Sol-gel of barium titanate was prepared according to the similar ratios as pellets. Thin films of barium titanate sol-gel were deposited using a desktop printer onto a glass substrate and fired at 400 °C. Both pellets and thin films were characterized by X-ray diffraction, scanning electron microscope, Atomic Force Microscope (thin films only), and impedance spectroscopy. This thesis focuses on determination of dielectric properties of barium titanate including the resistance, capacitance, dielectric constant, relaxation frequency, and loss tangent. The highest density for the barium titanate pellets were 5.90 g/cm3 when a Ba:Ti ratio of 1:1 was used. The average thicknesses of the thin films were 2.89 nm as measured using the atomic force microscope and verified using the scanning electron microscope. Characteristic of barium titanate were observed under various temperatures starting from room temperature up to 450 °C (for pellets) and 300 °C (for thin films). The measured dielectric constant of the pellets at 10 kHz (at room temperature) varied from a maximum of 2810 to a minimum of 1375. Samples with Ba:Ti ratio of 1:1 show the highest dielectric properties. The highest dielectric constant was measured at 100 °C for stoichiometric samples. X-ray diffraction result shows the production of a secondary phase, Ba2TiO4 when barium excess of 5 % or 10 % was added. The barium titanate thin films showed lower crystallinity than the pellets. X-ray diffraction peak broadening measurements of the thin films show an average crystallite size of 14 nm compared to 110 nm for the pellets. Impedance spectroscopy of the barium titanate pellets show the presence of a resistive grain boundary component, a conductive bulk component as well as a ferroelectric third component. The presence of these components were verified via Curie Weiss plots where applicable. The barium titanate thin films did not show the presence of the ferroelectric component. The dielectric constant of the pellets (ɛ= 2810) were significantly higher than the dielectric constant of the thin films (ɛ = 342) and this was attributed to the lower crystallinity of the thin films.
      1  4
  • Publication
    Contribution of interfacial bonding towards geopolymers properties in geopolymers reinforced fibers: A review
    ( 2022)
    Muhd Hafizuddin Yazid
    ;
    Meor Ahmad Faris bin Meor Ahmad Tajudin
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Marcin Nabiałek
    ;
    Shayfull Zamree Abd. Rahim
    ;
    Mohd Arif Anuar Mohd Salleh
    ;
    Marwan Kheimi
    ;
    Andrei Victor Sandu
    ;
    Adam Rylski
    ;
    Bartłomiej Jeż
    There is a burgeoning interest in the development of geopolymers as sustainable construction materials and incombustible inorganic polymers. However, geopolymers show quasi-brittle behavior. To overcome this weakness, hundreds of researchers have focused on the development, characterization, and implementation of geopolymer-reinforced fibers for a wide range of applications for light geopolymers concrete. This paper discusses the rapidly developing geopolymer-reinforced fibers, focusing on material and geometrical properties, numerical simulation, and the effect of fibers on the geopolymers. In the section on the effect of fibers on the geopolymers, a comparison between single and hybrid fibers will show the compressive strength and toughness of each type of fiber. It is proposed that interfacial bonding between matrix and fibers is important to obtain better results, and interfacial bonding between matrix and fiber depends on the type of material surface contact area, such as being hydrophobic or hydrophilic, as well as the softness or roughness of the surface.
      5  21
  • Publication
    Interaction of Geopolymer Filler and Alkali Molarity Concentration towards the Fire Properties of Glass-Reinforced Epoxy Composites Fabricated Using Filament Winding Technique
    ( 2022-09-01)
    Mohammad Firdaus Abu Hashim
    ;
    Meor Ahmad Faris Meor Ahmad Tajudin
    ;
    Mydin M.A.O.
    ;
    Che Mohd Ruzaidi Ghazali
    ;
    Yusrina Mat Daud
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Farah Farhana Zainal
    ;
    Saloma
    ;
    Muhammad Faheem Mohd. Tahir
    ;
    Heah Cheng Yong
    ;
    Khorami M.
    This paper aims to find out the effect of different weight percentages of geopolymer filler in glass-reinforced epoxy pipe, and which can achieve the best mechanical properties and adhesion between high calcium pozzolanic-based geopolymer matrices. Different weight percentages and molarities of epoxy hardener resin and high calcium pozzolanic-based geopolymer were injected into the glass fiber. By manually winding filaments, composite samples were produced, and they were then allowed to cure at room temperature. To determine how well the geopolymer matrices adhere to the fiber reinforcement, the microstructure of the composites’ surfaces and perpendicular sections were examined. Maximum values of compressive strength and compressive modulus were 94.64 MPa and 2373.58 MPa, respectively, for the sample with a weight percentage of filler loading of 30 wt% for an alkali concentration of 12 M. This is a relatively wide range of geopolymer weight percentage of filler loading from 10 wt% to 40 wt%, at which we can obtain high compressive properties. By referring to microstructural analysis, adhesion, and interaction of the geopolymer matrix to glass fiber, it shows that the filler is well-dispersed and embedded at the fiber glass, and it was difficult to determine the differences within the range of optimal geopolymer filler content. By determining the optimum weight percent of 30 wt% of geopolymer filler and microstructural analysis, the maximum parameter has been achieved via analysis of high calcium pozzolanic-based geopolymer filler. Fire or elevated temperature represents one of the extreme ambient conditions that any structure may be exposed to during its service life. The heat resistance or thermal analysis between glass-reinforced epoxy (GRE) pipe and glass-reinforced epoxy pipe filled with high calcium pozzolanic-based geopolymer filler was studied by investigating burning tests on the samples, which shows that the addition of high calcium pozzolanic-based geopolymer filler results in a significant reduction of the melted epoxy.
      1
  • Publication
    Mechanical effects on different solid to liquid ratio of geopolymer filler in epoxy resin
    ( 2021)
    Mohammad Firdaus Abu Hashim
    ;
    Che Mohd Ruzaidi Ghazali
    ;
    Yusrina Mat Daud
    ;
    Meor Ahmad Faris bin Meor Ahmad Tajudin
    ;
    Saloma Hasyim
    ;
    Muhammad Taqiyuddin Lokman
    ;
    Farah Farhana Zainal
    ;
    Mohd. Mustafa Al Bakri Abdullah
    Geopolymer is formed from the alkali activation of materials rich in Si and Al content with the addition of a silicate solution to enhance the properties of the materials. This paper presents research on the mechanical properties of fly ash-based geopolymer filler in epoxy resin by varying different solid to liquid ratios using sodium hydroxide and sodium silicate as the alkaline activator. However, the common problem observed from the solid to liquid ratio is the influence of curing time and compressive strength of geopolymer to have the best mechanical property. The mix design for geopolymers of solid to liquid ratio is essential in developing the geopolymer’s mechanical strength. A series of epoxy filled with fly ash-based geopolymer materials with different solid to liquid ratio, which is prepared from 0.5 to 2.5 solid to liquid ratio of alkaline activator. The tensile strength and flexural strength of the epoxy filled with fly ash-based geopolymer materials is determined using Universal Testing Machine under tensile and flexural mode. It was found that the optimum solid to liquid ratio is 2.0, with the optimum tensile and flexural strength value. However, both the tensile and flexural properties of epoxy filled with fly ash-based geopolymer suddenly decrease at a 2.5 solid to liquid ratio. The strength is increasing with the increasing solid to liquid ratio sample of geopolymer filler content.
      2  6
  • Publication
    Low Density, High Compressive Strength: Experimental Investigation with Various Particle Sizes of Sand for Different Mix Designs of Cement Mortar Manufacturing
    ( 2020-07-09)
    Rmdan Amer A.A.
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Liew Yun Ming
    ;
    Faheem Mohd Tahir M.
    ;
    Wazien Ahmad Zailani W.
    ;
    Meor Ahmad Faris Meor Ahmad Tajudin
    Concrete density was optimised by substituting part of the normal-density aggregates (fine aggregate, coarse aggregate, or both) with that of comparable quantities of low-density aggregate, which enhanced structural efficiency (strength to density ratio), improved hydration and decreased transportation costs. These days, focus is given on enhancing the characteristics of concretes in order to make them more efficient. A factor associated in compressive strength, packing particle, water absorption and density is concrete proportioning. A good proportioning mix results in greater strength for concrete at optimum density and specified age. The filler effect is regarded as a physical feature pertaining to small particles for a concrete material since it allows generating extra compressive strength by filling voids by making mortar or concrete more homogeneous. This behaviour allows conferring additional compressive strength as well as optimise or minimise the concrete's density without having to use a pozzolanic reaction or a chemical reaction. Mainly, this objective has been implemented through using three different lightweight particle sizes of sand group a-(1.18 mm ≤ Sand size < 200 m), b-(2.36 mm ≤ Sand size < 1.18 mm) and (5.0 mm ≤ Sand size < 2.36 mm). The parameters that are taken consideration during the investigation were sand particle size, water/cement ratio, cement/sand ratio. In general, the results demonstrated that there was a decrease in compressive strength when the sand's particle sizes increased. In case the particle size group (b) and (c) used the decrease rate in compressive strength was 7.97% and 12.39% respectively in comparison with particle size group (a) where the optimum values of the water/cement and cement/sand ratio were used. On the other hand, low density was achieved at the point of the higher compressive strength, whereas 4.4% and 3.66 % increase in the density was recorded over the particle sizes of sand (b and c) respectively. Meanwhile, we put forward the relationships existing between the compressive strength as well as density of concrete mixtures with various proportions of the lightweight aggregates as given above. The conducted experimental studies showed that there were tendencies to possibly utilise various quantities of fine lightweight aggregates as well as their combinations to yield concrete mixtures based on the requirements in practical application. As per the study conclusion, the considered mixtures could be used to yield structural elements that need high compressive strength and lower density.
      1
  • Publication
    Effects of aging to the mechanical properties of geopolymer concrete with addition of hooked steel fibers cured at ambient temperature
    ( 2020)
    Meor Ahmad Faris Meor Ahmad Tajudin
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Samad, Abdullah Abdul
    ;
    Ramasamy, Shamala
    ;
    Mohd Al-Hafiz Mohd Nawi
    The development of compressive and flexural strength versus aging time for steel fiber reinforced geopolymer concrete (SFRGC) cured at ambient temperature was studied. SFRGC is produced by mixing of Malaysian fly ash, alkali activator, aggragates, and hooked steel fibers. At the first stage, the addition of steel fibers in geopolymer concrete are by volume fraction which are 0 %, 0.5 %, 1.0 %, 1.5 %, and 2.0 % and cured at room temperature for 28 days. The optimum addition of steel fibers will be selected for further investigation related to the mechanical properties versus aging days. Chemical composition of Malaysia fly ash shows this fly ash is classified as class F. Result indicates 1.0 % of steel fibers addition exhibit the best performance for both compressive and flexural strength. Aging days show an improvement to mechanical properties where the compressive and flexural strength increases as the aging day increased. These mechanical properties improvement is almost similar to the mechanical growth exhibited by OPC concrete.
      1  6