Effect of fineness of palm oil fuel ash on compressive strength and microstructure of alkaline activated mortar

Elbasir, Otman M. M.; Johari, Megat Azmi Megat; Ahmad, Zainal Arifin

doi:10.1080/19648189.2016.1271362

Cited by 13 publications

(4 citation statements)

References 38 publications

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“…Já a superfície específica da CCD está ligeiramente menor do que o usualmente relatado (entre 915 m²/kg e 1.871 m²/kg). Isso se deve ao uso de processos de calcinação sob altas temperaturas em fornalhas a gás, seguido de segunda etapa de moagem para produção de granulometria mais fina por tais estudos (ELBASIR; MEGAT JOHARI; AHMAD, 2019;SALIH et al, 2015b). A superfície específica da CQM se encontra dentro da faixa usualmente utilizada (entre 567 m²/kg e 6.260 m²/kg).…”

Section: Materiais Precursoresunclassified

Desenvolvimento de argamassa álcali-ativada baseada em cinzas de caldeira de dendê e queima de madeira

2023

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Resumo Os materiais álcali-ativados são conhecidos por apresentarem rápido desenvolvimento de elevada resistência mecânica, alta estabilidade química e possível reutilização de resíduos durante sua formulação, o que permite reaproveitar recursos e reduzir impactos ambientais. O presente trabalho desenvolveu argamassas álcali-ativadas empregando cinzas de caldeira de dendê e de queima de madeira, beneficiadas por meio de moagem e peneiramento. Avaliaram-se as características físico-químicas dos materiais por meio de ensaios de difração de raios laser, difração e fluorescência de raios x e termogravimetria, e formularam-se aglomerantes variando as relações molares CaO/SiO2e SiO2/Al2O3. Foram avaliadas seis formulações, duas das quais commetacaulim como fonte complementar de Al2O3. Avaliadas as propriedades mecânicas dos aglomerantes, formularam-see avaliaram-se três argamassas com variação do teor volumétrico de agregado em 25% e 50% quanto a trabalhabilidade, resistência mecânica, absorção de água e desenvolvimento de eflorescência. Houve desenvolvimento total de resistência com apenas 2 dias, e resistência à tração média de 3,54 MPa e à compressão de 10,5 MPa. As argamassas apresentaram baixa susceptibilidade ao desenvolvimento de eflorescência e taxa de absorção de 9,6%, o que confirma o potencial de aproveitamento dessas cinzas como material precursor para argamassas.

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Section: Materiais Precursoresunclassified

Desenvolvimento de argamassa álcali-ativada baseada em cinzas de caldeira de dendê e queima de madeira

2023

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“…The first step in preparing the POFA was drying the ash in a 105 • C oven for 24 hours to remove its inherent moisture since the POFA was placed outside the mill. The POFA was sieved using a 300-mesh sieve to remove coarser particles of the partially burnt ashes from fibers and palm kernel shells, following the work by Elbasir et al in 2017 [15]. The POFA was then ground using a ball mill fitted with 150 steel balls and rotated at 180 rpm for eight hours to obtain 10 µm particles.…”

Section: Palm Oil Fuel Ashmentioning

confidence: 99%

The Compressive Strength and Microstructure of Alkali-Activated Mortars Utilizing By-Product-Based Binary-Blended Precursors

Elbasir¹,

Johari

Ahmad

et al. 2023

Applied Mechanics

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Researchers have investigated the feasibility of using ultrafine palm oil fuel ash (u-POFA) as a cement replacement material because of its potential to reduce the environmental impact of concrete production. u-POFA, a by-product of palm oil fuel combustion, is a suitable replacement for Portland cement in concrete mixes because of its sustainability and cost-effectiveness. This study investigated the microstructural and compressive strengths of alkali-activated mortars (AAMs) based on fly ash (FA) and granulated blast-furnace slag (GBFS) being added with varying percentages of u-POFA. The mixture samples were prepared in eighteen mortars using sodium metasilicate (Na2SiO3) as the source material and sodium hydroxide (NaOH) as the alkaline activator. This study used field-emission scanning electron microscopy coupled with energy-dispersive X-ray spectrometry, X-ray diffraction, X-ray fluorescence, and Fourier-transform infrared spectroscopy to characterize the binary-blended mortars after 28 days of curing and determined the strength of the FA+GBFS (87.80 MPa), u-POFA+GBFS (88.87 MPa), and u-POFA+FA mortars (54.82 MPa). The mortars’ compressive strength was influenced by the CaO/SiO2 and SiO2/Al2O3 ratios in the mixture, which was directly due to the formation rate of geopolymer products of the calcium–alumina–silicate–hydrate (C–(A)–S–H), aluminosilicate (N–A–S–H), and calcium–silicate–hydrate (C–S–H) phases. Based on the contents of FA and GBFS, u-POFA significantly enhanced concrete strength; therefore, u-POFA used in a suitable proportion could enhance binary-blended AAMs’ microstructure.

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“…From [59], it can be seen that treated POFA (TPOFA) exhibited greater improved concrete performance than ground POFA (GPOFA) due to a reduction in LOI and enhanced chemical composition. UPOFA as a cement replacement has been studied using different particle sizes in the context of the performance of mechanical properties in cement mortar [60]; smaller sized particles tended to give enhanced compression strength for alkaline-activated mortar. Similarly, Hamada et al [57] found that 30% UPOFA enhanced compression strength and workability in palm oil clinker concrete.…”

Section: Ratio Of Replacementmentioning

confidence: 99%

Palm Oil Fuel Ash-Based Eco-Friendly Concrete Composite: A Critical Review of the Long-Term Properties

et al. 2021

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Rapid global infrastructural developments and advanced material science, amongst other factors, have escalated the demand for concrete. Cement, which is an integral part of concrete, binds the various individual solid materials to form a cohesive mass. Its production to a large extent emits many tons of greenhouse gases, with nearly 10% of global carbon (IV) oxide (CO2) emanating from cement production. This, coupled with an increase in the advocacy for environmental sustainability, has led to the development of various innovative solutions and supplementary cementitious materials. These aims to substantially reduce the overall volume of cement required in concrete and to meet the consistently increasing demand for concrete, which is projected to increase as a result of rapid construction and infrastructural development trends. Palm oil fuel ash (POFA), an industrial byproduct that is a result of the incineration of palm oil wastes due to electrical generation in power plants has unique properties, as it is a very reactive materials with robust pozzolanic tendencies, and which exhibits adequate micro-filling capabilities. In this study, a review on the material sources, affecting factors, and durability characteristics of POFA are carefully appraised. Moreover, in this study, a review of correlated literature with a broad spectrum of insights into the likely utilization of POFA-based eco-friendly concrete composites as a green material for the present construction of modern buildings is presented.

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Effect of fineness of palm oil fuel ash on compressive strength and microstructure of alkaline activated mortar

Cited by 13 publications

References 38 publications

Desenvolvimento de argamassa álcali-ativada baseada em cinzas de caldeira de dendê e queima de madeira

Desenvolvimento de argamassa álcali-ativada baseada em cinzas de caldeira de dendê e queima de madeira

The Compressive Strength and Microstructure of Alkali-Activated Mortars Utilizing By-Product-Based Binary-Blended Precursors

Palm Oil Fuel Ash-Based Eco-Friendly Concrete Composite: A Critical Review of the Long-Term Properties

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