Characteristics of lightweight fly ash aggregates produced with different binders and heat treatments

Koçkal, Niyazi Uğur; Özturan, Turan

doi:10.1016/j.cemconcomp.2010.09.007

Cited by 105 publications

(39 citation statements)

References 41 publications

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“…For ceramic tiles containing SFA, the L value was lower compared with tiles containing TFA because of the higher amounts of iron oxide and unburned impurities (Table 1). Also, the amount of Fe 2 O 3 present in both materials was Table 4 The reduction in open, water-accessible porosity that occurred with increased sintering temperatures was also observed in another investigation [21]. Samples sintered at 1190 o C were nearly impermeable.…”

Section: Tests and Analysis Performed On The Raw Materials And The Cementioning

confidence: 82%

Utilisation of different types of coal fly ash in the production of ceramic tiles

Koçkal¹

2012

Bol. Soc. Esp. Ceram. Vidr.

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The influence of varying proportions of different types of fly ash (used in place of feldspar) and different sintering temperatures on the sintered properties of ceramic tile bodies was evaluated. The results indicated that sintering ceramic tiles with a high fly ash content at a high temperature caused a decrease in the properties because of bloating. The ceramic samples containing a higher amount of fly ash that were sintered at low temperature exhibited lower water absorption, larger shrinkage and strength because of the densification observed also in microstructural investigation.Keywords: Sintering; Microstructure; Mechanical properties; Tiles. Utilización de diferentes tipos de cenizas volantes de carbón en la producción de baldosas cerámicasSe ha evaluado la influencia de la proporción de diferentes tipos de cenizas volantes (en lugar de feldespato) y diferentes temperaturas de sinterización en las propiedades de soportes cerámicos. Los resultados indicaron que las composiciones con un alto contenido de cenizas volantes provocaron una disminución en las propiedades de las piczas cocidas a alta temperatura como consecuencia del hinchamiento. Las composiciones con una mayor cantidad de cenizas sinterizadas a baja temperatura mostraron una menor absorción de agua, mayor contracción y resistencia mecánica debido a la densificación como también se observó en la investigación microestructural.

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Section: Tests and Analysis Performed On The Raw Materials And The Cementioning

confidence: 82%

Utilisation of different types of coal fly ash in the production of ceramic tiles

Koçkal¹

2012

Bol. Soc. Esp. Ceram. Vidr.

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“…Because of these facts, more and more scientists have been trying to find new ways in which such ash could be used, e.g., for the development of alkali-activated materials, which are frequently named geopolymers 2,3 , but also for the production of artificial aggregates. [4][5][6][7][8][9][10][11][12][13] Artificial aggregates can be obtained simply by the crushing and grinding of industrial waste if the basic starting material is bulk waste. If, however, the basic starting material is a fine powder, such as fly ash, such aggregate can be produced by several different routes, as follows: 1) by high-temperature procedures, e.g., foaming and/or sintering at elevated temperatures of approx.…”

Section: Introductionmentioning

confidence: 99%

Lightweight aggregates made from fly ash using the cold-bond process and their use in lightweight concrete

Frankovič¹,

Bosiljkov²,

Ducman³

2017

Mater. tehnol.

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Aggregates made from fly ash have been developed by means of the cold-bonding process, with the addition of Portland cement as a binder at (10, 20, and 30) % of mass fractions, and by pouring the mixtures into moulds. After curing for 28 d the samples were processed into aggregate by crushing and sieving. An aggregate containing a weight percentage of 10 % of cement was additionally produced by pelletization on a granulating plate. The density, water-adsorption capacity, porosity, compressive strengths, and frost resistance of the samples were determined. The aggregates prepared by both routes were then used to make concrete samples, whose properties were then compared to those of conventional concrete made using limestone aggregate. The compressive strength of the concrete made with the granulated aggregate reached 16.0 MPa after 28 d, whereas that of the concrete made with crushed aggregate amounted to 24.1 MPa, and that of the conventional concrete was 34.6 MPa. Keywords: fly ash, lightweight aggregates, density, compressive strength, frost resistance Agregati izdelani iz elektrofiltrskega pepela so bili razviti s postopkom hladnega vezanja, z dodatkom (10, 20 in 30) % masnega dele`a Portland cementa kot veziva in z ulivanjem me{anice v modele. Po 28 dnevnem strjevanju vzorcev so bili vzorci predelani v agregat z drobljenjem in sejanjem. Sestava, ki je vsebovala 10 masnih % cementa, je bila {e dodatno peletizirana na plo{~i za granuliranje. Dolo~ene so bile: gostota, kapaciteta absorpcije vode, poroznost, tla~na trdnost in odpornost na zamrzovanje. Sestave, izdelane na oba na}ina, so bile uporabljene za izdelavo betonskih vzorcev, katerih lastnosti so bile primerjane z lastnostmi obi~ajno izdelanega betona z uporabo sestave apnenca. Tla~na trdnost betona, izdelanega z granulirano sestavo, je dosegla 16,0 MPa po 28 dneh, medtem, ko je pri betonu izdelanem iz drobljenega agregata, zna{ala 24,1 MPa, pri obi~ajnem betonu pa je bila 34,6 MPa.

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“…Previous research conducted by Kockal also mentioned that the sintering temperature of the LWA played an important role in the properties of the produced concrete [11]. Heat treatment in certain temperature proofed to change the properties of the material such as porosity and water absorption [11,4]. The open pores of the aggregate change into close pores during heat treatment which lead to a decrease in water absorption and an increase in the strength of the aggregate.…”

Section: Compressive Strengthmentioning

confidence: 99%

“…The higher compressive strength of this fly ashbased LWA concrete occurred due to the higher sintering temperature applied. Previous research conducted by Kockal also mentioned that the sintering temperature of the LWA played an important role in the properties of the produced concrete [11]. Heat treatment in certain temperature proofed to change the properties of the material such as porosity and water absorption [11,4].…”

Section: Compressive Strengthmentioning

confidence: 99%

Mechanical properties of concrete composed of sintered fly ash lightweight aggregate

Risdanareni

Ekaputri²,

Maulidiyawati

et al. 2018

MATEC Web Conf.

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Abstract. This paper investigates the effect of sintered fly ash lightweight aggregate as coarse aggregate substitution on the mechanical properties of concrete. The lightweight aggregate (LWA) was produced using the cold bonded method and then sintered at a temperature of 900°C. An alkaliactivated system was applied as a binding agent of the LWA. Fly ash was used as precursor while sodium hydroxide and sodium silicate were employed as alkali activators. Three variations of the LWA dosage were performed, which were 0%, 50%, and 100 % of the volume of coarse aggregate in the concrete mixture. The mechanical properties of the concrete investigated in this research are the compressive strength and split tensile strength. The result showed that the mechanical properties of the concrete slightly decrease along with the increased dosage of the LWA in the mixture. However, employing sintered fly ash the LWA is proven as an effective solution in reducing the concrete density without sacrificing its strength.

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Characteristics of lightweight fly ash aggregates produced with different binders and heat treatments

Cited by 105 publications

References 41 publications

Utilisation of different types of coal fly ash in the production of ceramic tiles

Utilisation of different types of coal fly ash in the production of ceramic tiles

Lightweight aggregates made from fly ash using the cold-bond process and their use in lightweight concrete

Mechanical properties of concrete composed of sintered fly ash lightweight aggregate

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