FT-IR Study, Thermal Analysis, and Evaluation of the Antibacterial Activity of a MK-Geopolymer Mortar Using Glass Waste as Fine Aggregate

Poggetto, Giovanni Dal; D’Angelo, Antonio; Blanco, Ignazio; Piccolella, Simona; Leonelli, Cristina; Catauro, Michelina

doi:10.3390/polym13172970

Cited by 29 publications

(15 citation statements)

References 37 publications

(64 reference statements)

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“…Having chosen a metakaolin-based geopolymer system to which we have added the RC, we focused our investigations on the analysis of the Si-O-T (T = Si or Al) bands at 1080 cm −1 . The shift of this peak towards lower wavelength is indicative of the efficient reticulation/geopolymerization with the increase of Si-O-Al bonds of the metakaolin amorphous structure [ 18 , 26 ]. The experimental data prove that RC do not seem to affect the geopolymerization process, the principal process reflected in the FT-IR peaks evolution, leaving the Ca-O and Ti-O signal almost untouched.…”

Section: Discussionmentioning

confidence: 99%

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Recycling of Waste Corundum Abrasive Powder in MK-Based Geopolymers

et al. 2022

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Recycling corundum abrasive powder in metakaolin-based geopolymer formulations is proposed to reduce the amount of waste to be treated or disposed of in landfills, allowing to decrease ecological damage as well as to reduce transport costs for removal. The addition of waste corundum, as an important source of Al2O3, has proved to increase the slightly ionic conductivity of the leachate solution obtained after immersion in water of samples at 28 d of curing at room temperature. With the same curing conditions, the geopolymerization process has not been disturbed as evidenced by the FT-IR peak shift and XRD patterns. It was recorded a decrease in resistance to compression of the consolidated geopolymers of about 5% with 10 wt% addition and of about 77% with the addition of 20 wt% of waste corundum. In any case, the waste abrasive powder does not release heavy metals when added to a geopolymeric formulation based on MK, NaOH, and Na-silicate, and does not show relevant antibacterial properties, indicating the formation of a stable and safe final product with a ceramic-like appearance.

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Section: Discussionmentioning

confidence: 99%

“…Three replicates for each sample were performed to determine the average absolute deviation (AAD). All the entire procedure follows the one reported in [ 26 ].…”

Section: Methodsmentioning

confidence: 99%

Recycling of Waste Corundum Abrasive Powder in MK-Based Geopolymers

et al. 2022

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“…The apparent water absorption increase (from 0.4% to 18%) and porosity increase (from 0.3% to 32%), due to the increased KOH ratio, may result from the samples cast with higher molarity of KOH having greater absorption due to dependence upon cation type and pH [40]. When the calcining temperature rises, the bulk density increases from 2 to 3 g/cm 3 . This might be due to the higher temperature integrating the sample and crystallizing the inner structure and, as a consequence, enhancing the mechanical properties [33].…”

Section: Viscosity and Mechanical Propertiesmentioning

confidence: 99%

“…Geopolymers are made by mixing aluminosilicate-rich materials with alkaline solutions [1]. In addition to being obtained from natural ores, aluminosilicate materials are obtained from wastes, such as by-products, glass, fly ash, and blast furnace slag [2][3][4]. Alkaline solutions are mostly based on potassium and sodium, that not only promote geopolymerization to consolidate its colloid, but also have the function of balancing the charge of the aluminosilicate tetrahedron structures by their alkali metal cations [5].…”

Section: Introductionmentioning

confidence: 99%

Using Geopolymer Technology on Synthesizing Leucite Ceramics

2021

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The aim of this study is to assess the process of synthesizing potassium-based geopolymers (KGL) into leucite ceramics with regard to five variables, namely, alkaline solution ratio (R), sintering time (S), calcining temperature (T), mixing time (M), and curing time (C). Under these conditions, the specimens were tested by the viscosity test, the mechanical properties test, X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM) to understand the geopolymerization reactions and the characteristics of the KGL network. The results indicate that a KOH to K2O/SiO2 ratio of 1:1 promotes the reaction within metakaolin. XRD analysis of the KGL shows that, when the temperature is 1100 °C, the phase transforms into the leucite phase. Moreover, XRD analysis, mechanical properties, and FTIR all indicate improved characteristics when the curing time increases from 1 to 8 h. This might be attributed to the enhancement of the strong interaction between the matrix and the alkaline solution upon achieving adequate time to complete the geopolymerization process and forming a more stable three-dimensional structure. The formulation which formed the purest leucite phase consisted of: a 1:1 alkaline solution ratio, 10 min mixing time, 8 h curing time, 1200 °C calcining temperature, and 2 h sintering time.

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“…The same research group, aiming to reduce the percentage of debris disposal derived from urban solid waste, suggested an upcycling process where glass debris is simply ground without any washing operation and added to an alkali-activated paste. Thus, metakaolin-based geopolymer mortar added with coarsely ground glass waste has been prepared and characterized, showing interesting antibacterial properties [ 10 ].…”

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confidence: 99%