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    Wyświetlanie 1-14 z 14
    Tytuł:
    The Effect of Titanium Nitride Thickness as a Support Layer for Carbon Nanotubes Growth
    Autorzy:
    Ramli, Muhammad M.
    Osman, Nurul H.
    Darminto, D.
    Abdullah, Mohd Mustafa Al Bakri
    Powiązania:
    https://bibliotekanauki.pl/articles/2125537.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    titanium nitride
    support layer
    carbon nanotubes
    interconnection
    Opis:
    The effect of titanium nitride (TiN) thickness as the support layer for carbon nanotubes (CNTs) growth was investigated by depositing three different thicknesses: 20 nm, 50 nm and 100 nm. This TiN support layer was deposited on SiO2 pads before depositing nickel (Ni) as the catalyst material. The Ni distribution on different TiN thicknesses was studied under hydrogen environment at 600°C. Then, the samples were further annealed at 600°C in acetylene and hydrogen environment for CNTs growth. The results show that, the optimum TiN thickness was obtained for 50 nm attributed by the lowest D to G ratio (0.8).
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 963--966
    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:
    Setting Time and after Setting Properties of High Calcium Fly Ash Geopolymers with Different Concentration of Sodium Hydroxide
    Autorzy:
    Mohamed, Rosnita
    Razak, Rafiza Abd
    Abdullah, Mohd Mustafa Al Bakri
    Sofri, Liyana Ahmad
    Aziz, Ikmal Hakem
    Shahedan, Noor Fifinatasha
    Powiązania:
    https://bibliotekanauki.pl/articles/2106582.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high calcium fly ash geopolymers
    setting time
    heat evolved
    early age properties
    concentration of sodium hydroxide
    Opis:
    Setting time in geopolymers is known as the time taken for the transition phase of liquid to solid of the geopolymer system in which is represented in the initial setting and final setting. Setting time is significant specifically for application in the construction field. This study intends to determine the setting time of high calcium fly ash geopolymers and the properties of the geopolymers after setting (1-day age). This includes the determination of heat evolved throughout geopolymerization using Differential Scanning Calorimeter. After setting properties determination includes compressive strength and morphology analysis at 1-day age. High calcium fly ash was used as geopolymer precursor. Meanwhile, for mixing design, the alkali activator was a mixture of sodium silicate and sodium hydroxide (concentration varied from 6M-14M) with a ratio of 2.5 and a solid-to-liquid ratio of 2.5. From this study, it was found that high calcium fly ash geopolymer with 12M of NaOH has a reasonable setting time which is suitable for on-site application as well as an optimal heat evolved (-212 J/g) which leads to the highest compressive strength at 1-day age and no formation of microcracks observed on the morphology. Beyond 12M, too much heat evolved in the geopolymer system can cause micro-cracks formation thus lowering the compressive strength at 1-day age.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 2; 563--567
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of bolt configurations on stiffness for steel-wood-steel connection loaded parallel to grain for softwoods in Malaysia
    Autorzy:
    Razim, Nur Liza
    Sheng, Francis Ting Shyue
    Karim, Abdul Razak Abdul
    Nabialek, Marcin
    Abdullah, Mohd Mustafa Al Bakri
    Sroka, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2174044.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sztywność
    analiza elementów skończonych
    połączenie śrubowe
    połączenie stal-drewno-stal
    drewno miękkie
    Eurokod 5
    stiffness
    finite element analysis
    bolt connection
    steel-wood-steel connection
    softwood
    Eurocode 5
    Opis:
    Steel-wood-steel connection is widely seen in many applications, such as timber structures. The stiffness of steel-wood-steel connection loaded parallel to grain for softwoods originated from Malaysia was investigated in this study. Numerical models have been developed in ABAQUS to study the stiffness connection. Softwoods of Damar Minyak and Podo have been selected in this analysis. The comprehensive study focused on the effect of bolt configurations on stiffness. Numerical analysis is carried out and the developed model has been validated with the previous study. Further investigations have been made by using the validated model. From this model, numerical analysis of the stiffness values have been made for various bolt configurations, including bolt diameter, end distance, bolt spacing, number of rows and bolts and edge distance. The result shows that the stiffness of bolted timber connections for softwood depends on the bolt diameter, number of rows and bolts, end distance and edge distance. Based on the result, stiffness increased as the diameter of the bolt, end distance, number of rows and bolts and edge distance increased. It is also discovered that the stiffness equation in Eurocode 5 (EC5) is inadequate as the equation only considered parameters which are wood density and bolt diameter. Other connection parameters such as geometry are not considered in the EC5 equation.
    Źródło:
    Archives of Civil Engineering; 2022, 68, 3; 323--338
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Sintering Temperature on the Microstructure of Coal-Ash Based Geopolymers
    Autorzy:
    Burduhos-Nergis, Dumitru Doru
    Vizureanu, Petrica
    Achitei, Dragos C.
    Sandu, Andrei Victor
    Burduhos-Nergis, Diana Petronela
    Abdullah, Mohd Mustafa Al Bakri
    Powiązania:
    https://bibliotekanauki.pl/articles/28032460.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    geopolymers
    alkali activation
    microstructural analysis
    sintered structures
    high temperature exposure
    Opis:
    Currently, one of the main challenges of civil engineering and science materials engineers is to develop a sustainable substitute for Ordinary Portland Cement. While the most promising solution is provided by the geopolymerisation technology, most of the studied geopolymers are based on natural raw materials (kaolin). The metakaolin is mainly preferred because of its rapid rate of dissolution in the activator solution, easy control of the Si/Al ratio, and white color. However, its high cost prevents it from being widely used in geopolymer composites or other materials that can become an industrial alternative for Ordinary Portland Cement. Several studies have shown that geopolymers with good performance can also be obtained from secondary raw materials (industrial wastes such as coal ash or slag). This explains why countries with rapidly developing economies are so interested in this technology. These countries have significant amounts of industrial waste and lack a well-developed recycling infrastructure. Therefore, the use of these by-products for geopolymers manufacturing could solve a waste problem while simultaneously lowering virgin raw material consumption. This study evaluates the effect of replacing different amounts of coal ash with sand on the microstructure of sintered geopolymers. Accordingly, scanning electron microscopy and energy dispersive X-ray analysis were involved to highlight the morphological particularities of room-cured and sintered geopolymers.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 2; 631--637
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flexural Properties of Thin Fly Ash Geopolymers at Elevated Temperature
    Autorzy:
    Ng, Yong-Sing
    Liew, Yun Ming
    Heah, Cheng Yong
    Abdullah, Mohd Mustafa Al Bakri
    Ng, Hui-Teng
    Chan, Lynette Wei Ling
    Powiązania:
    https://bibliotekanauki.pl/articles/2134117.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thin geopolymer
    fly ash
    elevated temperature
    flexural strength
    Opis:
    This paper reports on the flexural properties of thin fly ash geopolymers exposed to elevated temperature. The thin fly ash geopolymers (dimension = 160 mm × 40 mm × 10 mm) were synthesised using 12M NaOH solution mixed with designed solids-to-liquids ratio of 1:2.5 and Na2SiO3/NaOH ratio of 1:4 and underwent heat treatment at different elevated temperature (300°C, 600°C, 900°C and 1150°C) after 28 days of curing. Flexural strength test was accessed to compare the flexural properties while X-Ray Diffraction (XRD) analysis was performed to determine the phase transformation of thin geopolymers at elevated temperature. Results showed that application of heat treatment boosted the flexural properties of thin fly ash geopolymers as the flexural strength increased from 6.5 MPa (room temperature) to 16.2 MPa (1150°C). XRD results showed that the presence of crystalline phases of albite and nepheline contributed to the increment in flexural strength.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 1145--1150
    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:
    Mechanical Effects on Different Solid to Liquid Ratio of Geopolymer Filler in Epoxy Resin
    Autorzy:
    Hashim, Mohammad Firdaus Abu
    Ghazali, Che Mohd Ruzaidi
    Daud, Yusrina Mat
    Faris, Meor Ahmad
    Abdullah, Mohd Mustafa Al Bakri
    Zainal, Farah Farhana
    Hasyim, Saloma
    Lokman, Muhammad Taqiyuddin
    Powiązania:
    https://bibliotekanauki.pl/articles/2048832.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    geopolymer filler
    fly ash
    tensile
    flexural
    morphology
    solid-liquid ratio
    Opis:
    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.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 1; 215-220
    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:
    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:
    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:
    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
    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 1-14 z 14

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