Synthesis and heavy metal immobilization behaviors of slag based geopolymer

Zhang, Yunsheng; Sun, Wei; Chen, Qianli; Chen, Lin

doi:10.1016/j.jhazmat.2006.09.033

Cited by 283 publications

(84 citation statements)

References 18 publications

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“…Moreover, Pangdaeng et al (2014) have reported that addition of OPC in high calcium fly ash enhances the attributes of geopolymer concrete cure in steam and thus facilitated the hydration process due to the presence of OPC in the binder and thereby yields improvement in compressive strength. Similar work of Yunsheng et al (2007) revealed that condition of curing have significance influence on the strength of slag based geopolymer concrete. Slag based geopolymer exhibited lower strength at ambient temperature compared to the steam cured specimens.…”

Section: Steam Curingmentioning

confidence: 62%

Methods of curing geopolymer concrete: A review

Nurruddin

2018

Int. j. adv. appl. sci.

114

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Geopolymer concrete is a new approach of concrete production by exclusion of ordinary Portland cement entirely with pozzolanic material. Beside water, concrete is the largest consumed substances, which demand huge portion of Portland cement. During Portland cement manufacturing process, high emission of carbon dioxide (CO2) is produced which results in polluting the surrounding environment. Moreover, a lot of energy is expended during cement production. Based on manufacturing situations, geopolymer concrete displays different behaviors and attributes. This paper succinctly discusses the different methods of curing of geopolymer concrete and figures out the best method of curing. Experimental findings revealed that condition of curing has a good influence on the mechanical properties of geopolymer concrete. Conventionally, ambience temperature curing of geopolymer concrete result in low strength development at an early age, while higher temperature curing results in significant strength improvement. Similarly, extended curing time enhanced the geopolymerisation mechanism and achieved greater strength. However, longer duration of curing at an elevated temperature result in failure of the sample.

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Section: Steam Curingmentioning

confidence: 62%

Methods of curing geopolymer concrete: A review

Nurruddin

2018

Int. j. adv. appl. sci.

114

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“…e synthesis and chemical composition of geopolymers are similar to those of zeolites, but their microstructure is amorphous to semicrystalline. e aluminosilicate source is usually an industrial mineral, waste, or by-product where silicon and aluminum ions are preferably located in amorphous phases [5][6][7][8][9][10]. Fly ash produced at coal-fired thermal plants has, recently, attracted a lot of research attention on its alkali activation and transformation into cementitious materials (geopolymer) [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Porous Fly Ash-Based Geopolymers Using Si as Foaming Agent

Kioupis

Kavakakis

Tsivilis

et al. 2018

Advances in Materials Science and Engineering

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is paper concerns the synthesis of foamed geopolymers using fly ash and metallic Si as the binder and the porogent agent, respectively. e Taguchi approach was applied in order to study the effect of some significant synthesis parameters such as the Si foaming agent content (% w/w fly ash based), the alkali type (R : Na or K), and the alkalinity (R/Al molar ratio) of the activation solution on the compressive strength and apparent density of the foamed geopolymers. e final products were characterized by means of XRD, FTIR, and SEM, while optical microscopy was applied for the evaluation of the porosity. Lightweight geopolymers with a compressive strength of 2.08-14.88 ΜPa and an apparent density of 0.84-1.55 g/cm 3 were prepared by introducing a Si content up to 0.2% w/w on fly ash basis.

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“…Slag based geopolymeric matrix showed a better immobilisation efficiency for Pb than for Cu in the case of large dosages of heavy metals, probably because ionic radius of Pb and Cu are different. Hence, Cu and Pb are immobilised in different ways in the slag based geopolymeric matrix (Yunsheng et al 2007).…”

Section: The Characteristics Of Heavy Metals and Heavy Metal Formsmentioning

confidence: 99%

Mechanisms of Heavy Metal Immobilisation using Geopolymerisation Techniques – A review

Gowripalan

2018

ACT

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Every year, substantial amount of waste materials containing toxic substances is produced throughout the world, which causes serious damage to the environment and poses threat to human health. Among available techniques of immobilisation of toxic elements in harmful by-products, geopolymerisation is considered as an effective approach to deal with many environmental issues. Geopolymer binders have long been recognised to have great potential in immobilisation of hazardous wastes due to its advantages over Portland cement based binders. A profound knowledge of how hazardous elements are immobilised by geopolymer binders is necessary for achieving effective waste management strategies. This paper provides some important aspects of geopolymer materials regarding the immobilisation mechanisms and factors influencing the immobilisation efficiency, which are necessary to carry out further research on addressing the hazardous waste immobilisation.

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Synthesis and heavy metal immobilization behaviors of slag based geopolymer

Cited by 283 publications

References 18 publications

Methods of curing geopolymer concrete: A review

Methods of curing geopolymer concrete: A review

Synthesis and Characterization of Porous Fly Ash-Based Geopolymers Using Si as Foaming Agent

Mechanisms of Heavy Metal Immobilisation using Geopolymerisation Techniques – A review

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