Synthesis and characterization of geopolymers containing blends of unprocessed steel slag and metakaolin: The role of slag particle size

Furlani, Erika; Maschio, S.; Magnan, M.; Aneggi, Eleonora; Andreatta, F.; Lekka, Maria; Lanzutti, A.; Fedrizzi, L.

doi:10.1016/j.ceramint.2017.12.131

Cited by 54 publications

(23 citation statements)

References 74 publications

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“…In general, the microstructure is a heterogeneous matrix consisting of alkali-activated gel and unreacted or partially reacted slag particles, and more unreacted particles are observed in AAS2. As discussed above, BFS1 has a higher content of CaO and Al 2 O 3 , which are the indispensable components during the alkali-activated process [44,45]. Then, after the alkali activation, AAS1 could produce more hydration gel, such as N–A–S–H, C–S–H and C–A–S–H, contributing to a more continuous matrix [46].…”

Section: Resultsmentioning

confidence: 99%

Microstructural and Mechanical Properties of Alkali Activated Materials from Two Types of Blast Furnace Slags

et al. 2019

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This paper investigated the effect of blast furnace slags (BFS) characteristics on the properties achievement after being alkali activated. The physical and chemical characteristics of BFS were determined by X-ray fluorescence (XRF), X-ray Diffraction (XRD) and laser granulometry. Multi-technical characterizations using calorimetry, XRD, Fourier Transform Infrared Spectroscopy (FTIR), Thermogravimetry (TG-DTG), scanning electron microscope (SEM), nitrogen sorption and uniaxial compressive strength (UCS) were applied to give an in-depth understanding of the relationship between the reaction products, microstructure and BFS characteristics. The test results show that the microstructure and mechanical properties of alkali activated blast furnace slags (BFS) highly depend on the characteristics of BFS. Although the higher content of basic oxide could accelerate the hydration process and result in higher mechanical properties, a poor thermal stabilization was observed. On the other hand, with a higher content of Fe, the hydration process in alkali activated BFS2 lasts for a longer time, contributing to a delayed compressive strength achievement.

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Section: Resultsmentioning

confidence: 99%

Microstructural and Mechanical Properties of Alkali Activated Materials from Two Types of Blast Furnace Slags

et al. 2019

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“…Bai et al [59] and Furlani et al [60] investigated the content and fineness of steel slag as a precursor on the properties of alkali-activated metakaolin material. In the study by Bai et al [59], they set two curing conditions (exposed curing at room temperature, sealed curing, and moist curing) and four substitution rates (0, 10%, 20%, and 40%).…”

Section: Properties Of Alkali-activated Steel Slagmentioning

confidence: 99%

“…Moreover, microstructure was enhanced due to beneficial physical and chemical reactions between the active components of steel slag and metakaolin [59]. According to the research of Furlani et al [60], two steel slag maximum particle sizes (250 µm and 125 µm) were used to replace metakaolin (0%, 20%, 40%, 60%, 80%, and 100% by mass). ey found that finer steel slag could play a better role, and 40% steel slag was the best dosage [60].…”

Section: Properties Of Alkali-activated Steel Slagmentioning

confidence: 99%

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Advances in Understanding the Alkali-Activated Metallurgical Slag

Liu

Zhang

Sun

2021

Advances in Civil Engineering

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This paper summarized and reviewed the mechanism and macro-performance of alkali-activated metallurgical slag, including steel slag, copper slag, ferronickel slag, and lead-zinc slag. Better activated method and alkali-activator are still needed to be developed to improve the performance of the metallurgical slag with low reactivity. Besides, the chemical components’ variation of these metallurgical slags from different regions will lead to unpredictable performance, which needs further study.

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“…The materials produced have diverse properties depending on the characteristics of the source materials, the additives, and the experimental conditions used. In this context, slags with varying content of Fe, Si, Al and Ca have been investigated, including ground granulated blast furnace slag mixed with fly ash [26][27][28], ferronickel (FeNi) slag [2,29,30] or mixtures of FeNi slag, construction and demolition wastes and red mud [31], mixtures of steel slag and metakaolin or kaolin [32,33], slags from non-ferrous metallurgy [34], and mixtures of fly ash and lead slag [35].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Alkali Activation Potential of a Polish Ferronickel Slag

et al. 2019

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In this study, the alkali activation potential of a Polish ferronickel slag (PS), for the production of inorganic polymers (IPs), is investigated. The effect of the main synthesis parameters, i.e., strength of the activating solution, consisting of NaOH and Na2SiO3 solutions and affecting (SiO2 + Al2O3)/Na2O and other important molar ratios in the reactive paste, pre-curing period, curing temperature and time and ageing period was investigated. The structural integrity of the produced specimens was tested after their (i) immersion in distilled water and acidic solutions for a period of 7–30 days, and (ii) firing at temperatures between 200 °C and 1000 °C. Several analytical techniques including X-ray diffraction, X-ray fluorescence, Fourier transform infrared spectroscopy, Differential scanning analysis-Thermogravimetry and Scanning Electron Microscopy were used for the characterization of the produced IPs. Results show that under the optimum synthesis conditions the IPs obtain compressive strength that exceeds 65 MPa. An innovative aspect of this study is that after heating at 400 °C, the specimens acquire compressive strength of 115 MPa and this indicates that they can be also used as fire resistant materials. This study highlights the potential of alkali activation for the valorization of a ferronickel slag and the production of IPs that can be used as binders or in several construction applications, thus improving the sustainability of the metallurgical sector.

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Synthesis and characterization of geopolymers containing blends of unprocessed steel slag and metakaolin: The role of slag particle size

Cited by 54 publications

References 74 publications

Microstructural and Mechanical Properties of Alkali Activated Materials from Two Types of Blast Furnace Slags

Microstructural and Mechanical Properties of Alkali Activated Materials from Two Types of Blast Furnace Slags

Advances in Understanding the Alkali-Activated Metallurgical Slag

Assessment of Alkali Activation Potential of a Polish Ferronickel Slag

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