Preparation of geopolymers from vanadium tailings by mechanical activation

Wei, Bo; Zhang, Yimin; Bao, Shenxu

doi:10.1016/j.conbuildmat.2017.03.234

Cited by 131 publications

(42 citation statements)

References 28 publications

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“…Karakoç et al reported that the weight increase in geopolymer concretes that produced using river aggregate and exposed to different concentrations of MgSO 4 solutions were between 0.62 and 1.86%, while the weight increase in geopolymer concretes which produced using crushed aggregate were between 0.84 and 2.11%. Wei et al stated that as the milling time of vanadium which was used as a binder in geopolymer concrete increase, the weight loss in the samples immersed in 5% sodium sulfate solution decreased. Albitar et al stated that the weight increases of FA‐based geopolymer concrete soaked in different sulfate solutions for 9 months were between 0.7 and 1.9%.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of sulfate and salt resistance of ferrochrome slag and blast furnace slag‐based geopolymer concretes

Özcan

Karakoç

2019

Structural Concrete

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In this study, mechanical, visual, and microstructure changes of geopolymer concrete exposed to sulfate and salt effects were investigated. Elazı g ferrochrome slag (EFS) and blast furnace slag (BFS)-based geopolymer concretes which completed curing time were immersed in 5% sodium sulfate (Na 2 SO 4 ), magnesium sulfate (MgSO 4 ), sodium chloride (NaCl), and magnesium chloride (MgCl 2 ) solutions for 12 weeks. The compressive strength values, ultrasonic pulse velocities, visual inspections, weight, and length changes of the samples were determined in this investigation. In addition, scanning electron microscopy was performed for the microstructure analysis of the samples removed from the solutions. Sulfate solutions had a more negative effect on the samples than salt solutions. As the EFS ratio in the mixture increases, the loss rate in the strength of the samples exposed to sulfate and salt solutions decreased. While samples exposed to sodium chloride, sodium sulfate, and magnesium sulfate solutions occurred weight gain, samples exposed to magnesium chloride occurred weight loss. The samples in salt solutions shrank, while the samples in sulfate solutions expanded. No deterioration occurred on the surfaces of the samples exposed to the solutions for 12 weeks. K E Y W O R D S blast furnace slag, chemical resistance, ferrochrome slag, geopolymer concrete, salt effect, sulfate effect

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Section: Resultsmentioning

confidence: 99%

Evaluation of sulfate and salt resistance of ferrochrome slag and blast furnace slag‐based geopolymer concretes

Özcan

Karakoç

2019

Structural Concrete

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“…A lot of research focuses on the applicability of metals recovery by reprocessing tailings [10,11], but it cannot dramatically reduce the storage amount of tailings after metals are recovered [12]. The overall utilization of reduced storage amount of tailings has become the focus of research as construction materials, for instance it is used in brick [13,14], autoclaved aerated concrete [15,16], ceramics [17], glass [18], and geopolymers/alkali-activated materials [19], et al…”

Section: Introductionmentioning

confidence: 99%

Utilization of tailings in cement and concrete: A review

Gou

Zhou

Then

2019

Science and Engineering of Composite Materials

110

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One of the advantages of cement and the cement concrete industry in sustainability is the ability to utilize large amounts of industrial solid wastes such as fly ash and ground granulated blast furnace slag. Tailings are solid wastes of the ore beneficiation process in the extractive industry and are available in huge amounts in some countries. This paper reviews the potential utilization of tailings as a replacement for fine aggregates, as supplementary cementitious materials (SCMs) in mortar or concrete, and in the production of cement clinker. It was shown in previous research that while tailings had been used as a replacement for both fine aggregate and cement, the workability of mortar or concrete reduced. Also, at a constant water to cement ratio, the compressive strength of concrete increased with the tailings as fine aggregate. However, the compressive strength of concrete decreased as the replacement content of the tailings as SCMs increased, even whentailings were ground into smaller particles. Not much research has been dedicated to the durability of concrete with tailings, but it is beneficial for heavy metals in tailings to stabilize/solidify in concrete. The clinker can be produced by using the tailings, even if the tailings have a low SiO2 content. As a result, the utilization of tailings in cement and concrete will be good for the environment both in the solid waste processing and virgin materials using in the construction industry.

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“…Since the VT component is mainly composed of silica and alumina oxides, it is a potential raw material for the preparation of geopolymers. According to previous studies, VT is usually combined with other materials (such as metakaolin) to synthesize geopolymer because of the extremely Si/Al ratio …”

Section: Introductionmentioning

confidence: 99%

“…According to previous studies, VT is usually combined with other materials (such as metakaolin) to synthesize geopolymer because of the extremely Si/Al ratio. 12 In this paper, VT was activated by calcining with sodium hydroxide (NaOH), and modified with metakaolin to form the geopolymeric precursor. The precursor reacts with water to form a hardened geopolymeric product with acceptable compressive strength.…”

Section: Introductionmentioning

confidence: 99%

Preparation of one‐part geopolymeric precursors using vanadium tailing by thermal activation

2019

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The main purpose of this study is to develop a user‐friendly one‐part geopolymer using vanadium tailing (VT). Geopolymeric precursor consists of activated VT and metakaolin that can react directly with water to form geopolymers. The roasting temperature plays an important role in the VT activation, which affects the compressive strength of the final geopolymer. The geopolymer with accepted compressive strength, that is 29.0 MPa after 7 days curing in ambient condition, can be prepared using VT after thermal activation at appropriate temperature (400‐600°C). As the roasting temperature is increased to 700°C, the VT is molten and sintered and the ability of providing alkaline and Si4+ is drastically weakened, which results in a poor compressive strength geopolymer.

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Preparation of geopolymers from vanadium tailings by mechanical activation

Cited by 131 publications

References 28 publications

Evaluation of sulfate and salt resistance of ferrochrome slag and blast furnace slag‐based geopolymer concretes

Evaluation of sulfate and salt resistance of ferrochrome slag and blast furnace slag‐based geopolymer concretes

Utilization of tailings in cement and concrete: A review

Preparation of one‐part geopolymeric precursors using vanadium tailing by thermal activation

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