Reuse options for coal fired power plant bottom ash and fly ash

Jayaranjan, Madawala Liyanage Duminda; Hullebusch, Eric D. van; Annachhatre, Ajit P.

doi:10.1007/s11157-014-9336-4

Cited by 177 publications

(88 citation statements)

References 145 publications

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“…However, Kolay and Singh [7] discussed the impacts of toxic contaminants on the environment. Also FA uses in soil treatment, as conditioners or filler material for low-lying wastelands, in refuse dumps reclamation, and construction or geotechnical secondary raw materials [8,9] has increased their potential geo-environmental impact. Therefore, the use of FA provides economic benefits by reducing disposal costs and negative environmental effects through engineering applications.…”

Section: Introductionmentioning

confidence: 99%

Physical and Geotechnical Properties of Tropical Peat and Its Stabilization

Kolay¹,

Taib²

2018

Peat

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The chapter presents the physical and engineering properties of tropical peat treated with various types of stabilizers. Quick lime (QL), fly ash (FA), and ordinary Portland cement (OPC) were used as stabilizers. The amounts of QL, FA, and OPC added with the peat samples are in the range of 2-8, 5-20, and 5-20%, respectively. Various physical or index and engineering tests have been conducted to characterize the peat samples. Unconfined compressive strength (UCS) tests were conducted on original and treated peat samples cured for 7, 14, and 28 days. The results show that the UCS value increases with the increase of all stabilizers used and with curing period. The UCS tests were also conducted on the peat samples with the combination of QL and FA to study the combined effects of the stabilizers. The present study established different correlations between physical and engineering properties of original peat and UCS results on treated peat samples with different types of stabilizers. Geotechnical engineers can refer to these correlations to determine the bearing capacity of treated peat. In addition, scanning electron microscope (SEM) studies were conducted on original and treated peat samples to investigate the microstructure of the samples.

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Section: Introductionmentioning

confidence: 99%

Physical and Geotechnical Properties of Tropical Peat and Its Stabilization

Kolay¹,

Taib²

2018

Peat

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“…Miktarı çok fazla olan, depolanması ve bertarafı sorun teşkil eden AKAK genellikle küresel değildir; 0,1-10 mm aralığında boyutta, belirgin koyu gri renkte ve gözenekli yapıdadır. AKAK çoğunlukla silikat, karbonat, alüminat, demir ve çeşitli metal ve metalloitlerden oluşur [5][6][7][8][9][10][11].…”

Section: Introductionunclassified

“…Jayaranjan vd. [11], literatür bilgisine dayanarak göreceli olarak yüksek özgül ağırlığa sahip (1,9-3,0) AKAK'ların mühendislik uygulamalarında kullanılması gerektiğini belirtmişlerdir. Wongkeo ve Chaipanich [18], AKAK ve silika dumanı ile yapılan hafif yapı malzemesi üzerine basınç dayanım, mikro yapı ve termal analizler yapmış ve silika dumanı karışıma eklendiğinde AKAK'lı hafif yapı malzemesinin basınç dayanımının arttığını bulmuşlardır.…”

Section: Introductionunclassified

Atik Kazan Alti Külü Ve Pomza Elek Alti Atiğindan Geopoli̇mer Yapi Malzemesi̇ Üreti̇mi̇

Doğan-Sağlamtimur

Bilgil

2018

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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ÖZPomza üretimi sırasında elek altı olarak tarif edilen ince malzeme açığa çıkmaktadır ve atık malzeme durumundadır. Endüstrilerde kömür yakılması sonrası açığa çıkan kazan altı külü de depolanamaz bir atıktır. Bu çalışmada atık değerlendirme amacıyla bu iki tip atık, alkali bir aktivatör olan sodyum hidroksit (NaOH) ile aktive edilerek geopolimer yapı malzemesi üretilmiştir. Deneysel çalışmada %50 atık kazan altı külü (AKAK)+%50 pomza elek altı atığı (PEAA) karıştırılarak oluşturulan atık dolgu malzemesine ağırlıkça %10, 15, 20 ve 25 oranında NaOH ilave edilmiştir. Numuneler 70, 100 ve 150 °C'ye ayarlanan etüvde 24 saat süresince kürlenmiştir. Daha sonra numunelerin fiziksel ve mekanik özellikleri belirlenmiştir. Basınç dayanım değerlerine göre optimum sonuç, %20 NaOH aktivatörlü 100 °C'de kürlenen numunede 16,5 MPa olarak bulunmuştur. Basınç dayanımlarında 28 günün sonunda 7 günlük değerlere göre %6-9 oranında artış gözlenmiştir. Su emme ve porozite değerlerinde, diğer yapı malzemelerine benzer sonuçlar elde edilmiştir. Atık malzeme esaslı NaOH aktivatörlü numunelerden dış tesirlere dayanıklı geopolimer yapı malzemesi üretilebilmiştir.Anahtar kelimeler: Atık yeniden kullanımı, geopolimer, kazan altı külü, pomza, yapı malzemesi GEOPOLYMER BUILDING MATERIAL PRODUCTION FROM WASTES OF BOTTOM ASH AND PUMICE ABSTRACTDuring pumice production, fine material that is stayed under the sieve is exposed as waste material. Bottom ash released into the air after burning coal in the industry is a non-deposit waste. In this study, for the aim of waste reuse, these two types of wastes were activated with sodium hydroxide (NaOH), an alkaline activator, and geopolymer building material was produced. In the experimental study, 10%, 15%, 20% and 25% NaOH were added to the filler material which was formed by mixing 50% waste bottom ash+50% pumice waste to produce geopolymer samples. The samples were cured in the oven that was set at 70, 100 and 150°C for 24 hours. Physical and mechanical properties of the samples were then determined. According to the compressive strength values, the optimum result was found to be 16.5 MPa in the sample activated with 20% NaOH cured at 100°C.Compressive strength values were increased (6-9%) in the samples at 28-day as compared to 7-day. Water absorption and porosity values were similar to those of other building materials. Geopolymer building material that is resistant to external influences can be produced from waste-based samples including NaOH activator.

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“…For many years this waste was placed in landfills, usually by hydraulic methods. According to the Central Statistical Office (Environment... 2016), about 294.1 million Mg of coal combustion waste 128 https://journals.agh.edu.pl/geol Szwalec A., Gruchot A., Mundała P., Zawisza E., Kędzior R. Żygadło & Woźniak 2009, Fenelonov et al 2010, Hirajima et al 2010, Haustein & Quand 2011, Kušnierová et al 2011, Jayaranjan et al 2014. These types of waste are also mentioned as a source of rare earth metals (Hycnar & Tora 2015, Jarosiński 2016.…”

Section: Introductionmentioning

confidence: 99%

Physicochemical and geotechnical properties of an ash-slag mixture deposited on a landfill in terms of its use in engineering

Szwalec

Gruchot

Mundała

et al. 2017

geol

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Coal combustion ash-slag mixtures have been deposited in landfills in Poland for decades. At the same time, there is a shortfall in the amount of available materials related to the construction and modernisation of transportation infrastructure. Thus, a typical landfill of a power station was chosen and the aim of the study was to assess the suitability of an ash-slag landfill mixture for construction engineering purposes. The following physicochemical analyses were conducted: pH, specific electrical conductivity and determination of the leachability of basic (Ca, Na, K and Mg) and trace elements (Cd, Pb, Cr, Zn and Cu). The content of selected basic and trace elements were determined in the eluates by FAAS and standard methods were applied for geotechnical analyses. The most likely conditions were assumed to the model. The mixture will not jeopardize surface water quality in terms of the concentrations of basic, hazardous or priority elements. The content of these elements also does not exceed permissible concentrations for groundwater. The conductance and pH of the eluates are in compliance with current laws. The solid mixture has favourable geotechnical parameters which are significantly dependent on moisture content. The slope stability calculations for embankments created from the mixture at optimum moisture content and high compaction (I S ≥ 0.95) indicate that they will be stable even in the case of high gradients (1:1.5). The slopes will be unstable in conditions of submersion, which should not occur if we assume the embankment will be used for passive flood protection. The mixture is particularly suitable for the purposes of earth structures, provided that they are isolated from water.

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Reuse options for coal fired power plant bottom ash and fly ash

Cited by 177 publications

References 145 publications

Physical and Geotechnical Properties of Tropical Peat and Its Stabilization

Physical and Geotechnical Properties of Tropical Peat and Its Stabilization

Atik Kazan Alti Külü Ve Pomza Elek Alti Atiğindan Geopoli̇mer Yapi Malzemesi̇ Üreti̇mi̇

Physicochemical and geotechnical properties of an ash-slag mixture deposited on a landfill in terms of its use in engineering

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