Properties of geopolymer from circulating fluidized bed combustion coal bottom ash

Topçu, İ̇lker Bekir; Toprak, Mehmet Uğur

doi:10.1016/j.msea.2010.10.062

Cited by 51 publications

(12 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In 2010, Xu et al developed a new thermostable geopolymer using CFBC bottom ash [26]. In 2011, Topcu and Toprak studied the properties of a geopolymer from CFBC coal bottom ash and proved that geopolymers can be effectively manufactured [27]. Nonetheless, considering the huge amount of CFBC bottom ash, the recent results are very limited, and some new methods which consume much more waste must be invented.…”

Section: Introductionmentioning

confidence: 99%

Feasibility of manufacturing geopolymer bricks using circulating fluidized bed combustion bottom ash

Chen¹,

Shen

et al. 2012

Environmental Technology

View full text Add to dashboard Cite

This paper presents a study on geopolymer bricks manufactured using bottom ash from circulating fluidized bed combustion (CFBC). The alkali activators used for synthesis were sodium silicate, sodium hydroxide, and potassium hydroxide and lithium hydroxide solutions. The study included the impact of alkali activator on compressive strength. The reaction products were analysed by XRD, FT-IR and SEM/EDS. The compressive strength of bricks was dependent on the modulus of the sodium silicate activator and the type and concentration of alkali activator. The highest compressive strength could be gained when the modulus was 1.5, and the value could reach 16.1 MPa (7 d after manufacture) and 21.9 MPa (28 d after manufacture). Under pure alkaline systems, the compressive strength was in the order of 10 M KOH > 10 M NaOH > 5 M LiOH > 5 M KOH > 5 M NaOH. Quartz was the only crystalline phase in the original bottom ash, and no new crystalline phase was found after the reaction. The main product of reaction was amorphous alkali aluminosilicate gel and a small amount of crystalline phase was also found by SEM.

show abstract

Section: Introductionmentioning

confidence: 99%

Feasibility of manufacturing geopolymer bricks using circulating fluidized bed combustion bottom ash

Chen¹,

Shen

et al. 2012

Environmental Technology

View full text Add to dashboard Cite

show abstract

“…In addition, as revealed in several previous studies (e.g. Antunes et al, 2013;Boonserm et al, 2012;Chindaprasirt and Rattanasak, 2010;Kiattikomol et al, 2001;Kim et al, 2012;Kong et al, 2007;Sathonsaowaphak et al, 2009;Somna et al, 2011;Temuujin et al, 2009b;Topçu and Toprak, 2011;Topçu et al, 2014), reducing the particle size of FA (e.g. Kiattikomol et al, 2001;Somna et al, 2011;Temuujin et al, 2009b) and BA (e.g.…”

Section: Introductionmentioning

confidence: 54%

“…The literature review also revealed that, among the reported studies on the use of BA to develop geopolymers, most have focused on the behaviour of geopolymer pastes (e.g. Antunes et al, 2013;Boonserm et al, 2012;Chen et al, 2012;Geetha and Ramamurthy, 2013;Slavik et al, 2008;Topçu and Toprak, 2011;Topçu et al, 2014;Xu et al, 2010) and mortars (e.g. Chindaprasirt and Rattanasak, 2010;Chindaprasirt et al, , 2011Chotetanorm et al, 2012;Kim et al, 2012;Kunjalukkal and Licciulli, 2014;Li et al, 2012;Sata et al, 2012;Sathonsaowaphak et al, 2009;Sinha et al, 2014), with only one reported study on the behaviour of BA-based GPCs (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Kiattikomol et al, 2001;Somna et al, 2011;Temuujin et al, 2009b) and BA (e.g. Antunes et al, 2013;Boonserm et al, 2012;Chindaprasirt and Rattanasak, 2010;Kim et al, 2012;Kong et al, 2007;Sathonsaowaphak et al, 2009;Topçu and Toprak, 2011;Topçu et al, 2014) through grinding can promote the reactivity of coal ashes, thereby significantly improving the mechanical properties of the resulting geopolymer products. However, research on the use of milled coal ash in ambiently cured GPC is so far extremely limited, with only a few studies reported on ambiently cured FA-based GPCs (e.g.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of coal ash properties on compressive behaviour of FA- and BA-based GPC

Xie

Ozbakkaloglu

2015

Magazine of Concrete Research

View full text Add to dashboard Cite

This paper presents the results of an experimental study on the behaviour of fly ash (FA) and bottom ash (BA) based geopolymer concretes (GPCs) cured at ambient temperature. A total of 11 batches of coal-ash-based GPCs were manufactured. Axial compression tests were carried out to determine the compressive behaviour and strength development of hardened GPCs. Test parameters included the type, particle size and chemical composition of coal ash, the alkaline liquid to binder ratio and concentration of sodium hydroxide solution. The results indicate that the chemical composition of BA has a pronounced influence on the compressive behaviour of GPCs, with concretes manufactured with BA with a higher silicon dioxide/aluminium oxide ratio developing higher strengths. The results also indicate that milling of the coal ash and the increased calcium oxide content of the BA both lead to significant improvements in the compressive strength of GPCs. It was also found that strength gain of ambiently cured coal-ashbased GPCs continues beyond a concrete age of 28 d and is significantly influenced by the type, particle size and chemical composition of the coal ash and the concentration of sodium hydroxide solution.

show abstract

“…Geopolymer based cement possesses excellent high temperature resistance up to 1200°C without sudden properties degradation. Topcu and Toprak [25] stated that geopolymers have good fire resistance up to 1000°C without emitting toxic gas. Portland cement shows a weak performance when subjected to a thermal treatment and begins to disintegrate when the temperature rises above 300°C [26].…”

Section: Introductionmentioning

confidence: 99%

Freeze-Thaw and Fire Resistance of Geopolymer Mortar Based on Natural and Waste Pozzolans

Degirmenci¹

2017

Ceramics - Silikaty

View full text Add to dashboard Cite

Properties of geopolymer from circulating fluidized bed combustion coal bottom ash

Cited by 51 publications

References 22 publications

Feasibility of manufacturing geopolymer bricks using circulating fluidized bed combustion bottom ash

Feasibility of manufacturing geopolymer bricks using circulating fluidized bed combustion bottom ash

Influence of coal ash properties on compressive behaviour of FA- and BA-based GPC

Freeze-Thaw and Fire Resistance of Geopolymer Mortar Based on Natural and Waste Pozzolans

Contact Info

Product

Resources

About