scholarly journals Development and Characterization of Glass-Ceramics from Combinations of Slag, Fly Ash, and Glass Cullet without Adding Nucleating Agents

Materials ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2032 ◽  
Author(s):  
Diana M. Ayala Valderrama ◽  
Jairo A. Gómez Cuaspud ◽  
Judith A. Roether ◽  
Aldo R. Boccaccini
Keyword(s):  
Thermal Analysis ◽  
Fly Ash ◽  
Structural Characteristics ◽  
Glass Ceramics ◽  
Industrial Applications ◽  
Industrial Wastes ◽  
Nucleating Agents ◽  
Glass Cullet ◽  
X Ray ◽  
Structural Applications

Developments in the field of materials science are contributing to providing solutions for the recycling of industrial residues to develop new materials. Such approaches generate new products and provide optimal alternatives to the final disposal of different types of industrial wastes. This research focused on identifying and characterizing slag, fly ash, and glass cullet from the Boyacá region in Colombia as raw materials for producing glass-ceramics, with the innovative aspect of the use of these three residues without the addition of nucleating agents to produce the glass-ceramics. To characterize the starting materials, X-ray diffraction (XRD), X-ray fluorescence (XRF), and Scanning Electron Microscopy (SEM) techniques were used. The results were used to evaluate the best conditions to produce mixtures of the three waste components and to determine the specific compositions of glass-ceramics to achieve products with attractive technical properties for potential industrial applications. The proposed mixtures were based on three compositions: Mixture 1, 2, and 3. The materials were obtained through thermal treatment at 1200 °C in a tubular furnace in accordance with the results of a comprehensive characterization using thermal analysis. The microstructure, thermal stability, and structural characteristics of the samples were examined through SEM, differential thermal analysis (DTA), and XRD analyses, which showed that the main crystalline phases were diopside and anorthite, with a small amount of enstatite and gehlenite. The obtained glass-ceramics showed properties of technical significance for structural applications.

scholarly journals Selection of Novel Geopolymeric Mortars for Sustainable Construction Applications Using Fuzzy Topsis Approach

2020 ◽  
Vol 12 (15) ◽  
pp. 5987 ◽  
Author(s):  
Manfredi Saeli ◽  
Rosa Micale ◽  
Maria Paula Seabra ◽  
João A. Labrincha ◽  
Giada La Scalia
Keyword(s):  
Fly Ash ◽  
Construction Materials ◽  
Fuzzy Topsis ◽  
Industrial Wastes ◽  
Engineering Properties ◽  
Structural Element ◽  
Structural Applications ◽  
Multi Criteria Analysis ◽  
Biomass Fly Ash ◽  
Topsis Approach

Construction is recognized as one of the most polluting and energy consuming industries worldwide, especially in developing countries. Therefore, Research and Development (R&D) of novel manufacturing technologies and green construction materials is becoming extremely compelling. This study aims at evaluating the reuse of various wastes, originated in the Kraft pulp-paper industry, as raw materials in the manufacture of novel geopolymeric (GP) mortars whose properties fundamentally depend on the target application (e.g., insulating panel, partition wall, structural element, furnishing, etc.). Five different wastes were reused as filler: Two typologies of Biomass Fly Ash, calcareous sludge, grits, and dregs. The produced samples were characterized and a multi criteria analysis, able to take into account not only the engineering properties, but also the environmental and economic aspects, has been implemented. The criteria weights were evaluated using the Delphi methodology. The fuzzy Topsis approach has been used to consider the intrinsic uncertainty related to unconventional materials, as the produced GP-mortars. The computational analysis showed that adding the considered industrial wastes as filler is strongly recommended to improve the performance of materials intended for structural applications in construction. The results revealed that the formulations containing 5 wt.% of calcareous sludge, grits, and dregs and the one containing 7.5 wt.% of calcareous sludge, grits, dregs, and Biomass Fly Ash-1 have emerged as the best alternatives. Furthermore, it resulted that the Biomass Fly Ash-2 negatively influences the structural performance and relative rank of the material. Finally, this case study clearly shows that the fuzzy Topsis multi-criteria analysis represents a valuable and easy tool to investigate construction materials (either traditional and unconventional) when an intrinsic uncertainty is related to the measurement of the quantitative and qualitative characteristics.

Effect of CaO/SiO2 Ratio and TiO2 on Glass-Ceramics Made from Steel Slag and Fly Ash

2012 ◽  
Vol 217-219 ◽  
pp. 119-123 ◽  
Author(s):  
Bao Wei Li ◽  
Hua Chen ◽  
Ming Zhao ◽  
Xue Feng Zhang ◽  
Yong Sheng Du ◽  
...  
Keyword(s):  
Fly Ash ◽  
Bending Strength ◽  
Steel Slag ◽  
Glass Ceramics ◽  
Nucleating Agent ◽  
Spherical Particles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Main Crystalline Phase ◽  
Average Size

Glass ceramics of the CaO-MgO-Al2O3-SiO2 system were fabricated by adopting the melting-casting procedure. Steel slag and fly ash were used as the major starting materials. The influence of CaO/SiO2 Ratio variations on the microstructure and mechanical properties were investigated using X-ray diffraction, scanning electron microscopy and property measurements. Augite is identified as the main crystalline phase of the as studied glass ceramics. The average size of augite grains in form of spherical particles is found within the range of 100-250nm. The bending strength of the glass-ceramics could reach as high as 170.74MPa. Increasing CaO/SiO2 show a beneficial influence on the crystallization of glass ceramics, and its effectiveness is inferior compared with that of increasing addition of nucleating agent, TiO2.

Effects of Phosphorus and Fluorine on the Crystallization and Structure of CaO-A12O3-SiO2 System Glass-Ceramic

2008 ◽  
Vol 368-372 ◽  
pp. 1412-1414 ◽  
Author(s):  
Jin Shu Cheng ◽  
Hui Guang Qiu ◽  
Hong Li ◽  
Jun Xie
Keyword(s):  
Electron Microscopy ◽  
Thermal Analysis ◽  
Scanning Electron Microscopy ◽  
Glass Ceramic ◽  
Glass Ceramics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Yellow Phosphorus ◽  
Crystallization Of Glass ◽  
Scanning Electron

CaO-A12O3-SiO2 (CAS) system glass-ceramics were prepared by sintering with certain amount of yellow phosphorus slag. The effects of phosphorus and fluorine on the nucleation, crystallization and structure of CAS system glass-ceramics were investigated by differential thermal analysis, X-ray diffraction, scanning electron microscopy and other measuring methods. Glass-ceramics of CAS system with 42.32wt% yellow phosphorus slag were obtained by nucleating at 615°C for 1 hour and crystallizing at 926°C for 2 hours. The results showed that the introduction of phosphorus and fluorine promoted the nucleation and crystallization of glass-ceramics, lowering the crystallizing temperature. The main crystal phase of glass-ceramics was β-wollastonite. The density of the glass-ceramic was 2.695g/cm3.

Feasibility of Producing Glass-Ceramics from a Mixture of Glass Cullet-Eggshell and Perlite

2018 ◽  
Vol 766 ◽  
pp. 139-144
Author(s):  
Patiphan Nakkam ◽  
Napat Chantaramee
Keyword(s):  
Weight Loss ◽  
Chemical Resistance ◽  
Sodium Hydroxide Solution ◽  
Glass Ceramics ◽  
Soda Lime ◽  
Nucleating Agent ◽  
Chemical Compositions ◽  
Glass Cullet ◽  
X Ray Diffraction ◽  
X Ray

Feasibility of producing glass-ceramics from cullet, eggshell and perlite was investigated. In this study, a nucleating agent was synthesized from calcined eggshell and expanded perlite prior to blend with soda-lime waste glass, and then sintered at temperatures ranging from 850 to 1050°C at a heating rate of 10°C/min for 30 - 180 minutes. The crystallization behavior of glass-ceramics was investigated by means of X-ray diffraction analysis and surface morphology, and the chemical compositions were evaluated by scanning electron microscopy and energy dispersive X-ray spectroscopy. Results showed that crystalline phase embedded in the glass phase were needle-like crystal of wollastonite, cristobalite and quartz. According to the chemical resistance test, the obtained glass-ceramics showed acceptable corrosion resistance particularly in acidic environment. The weight loss for glass-ceramics immersed in 1wt% of sodium hydroxide solution was 0.28 - 0.50 wt%, while weight loss due to 1vol% of sulfuric acid solution was 0.04 - 0.16 wt%.

Crystal Structure, Vibrational Spectra and Thermal Analysis of Bis(saccharinato)bis(pyridine)zinc(II)

1997 ◽  
Vol 52 (2) ◽  
pp. 183-187 ◽  
Author(s):  
O. V. Quinzani ◽  
S. Tarulli ◽  
O. E. Piro ◽  
E. J. Baran ◽  
E. E. Castellano
Keyword(s):  
Crystal Structure ◽  
Thermal Analysis ◽  
Thermal Behavior ◽  
Single Crystal ◽  
Vibrational Spectra ◽  
Structural Characteristics ◽  
Monoclinic Space Group ◽  
X Ray ◽  
Related Compounds ◽  
Ir And Raman

Abstract The crystal structure of [Zn(sac)2(py)2] has been de termined by single-crystal X-ray diffractometry. It crystallizes in the monoclinic space group C2/c with Z = 4. We propose and discuss an assignment of its IR and Raman spectra, compatible with the structural characteristics. Its thermal behavior was investigated by means of TG and DTA methods. Some comparisons with related compounds are made.

Research on Influence of Fly Ash on the the Microstructural Characteristics of Sea Sand Concrete

2012 ◽  
Vol 204-208 ◽  
pp. 3831-3834
Author(s):  
Guo Liang Zhang ◽  
Jian Bin Chen ◽  
Li Wei Mo ◽  
Jun Zhe Liu ◽  
Zhi Min He
Keyword(s):  
Thermal Analysis ◽  
Electron Microscope ◽  
Fly Ash ◽  
Structural Characteristics ◽  
Xrd Analysis ◽  
Microstructural Characteristics ◽  
Sea Sand ◽  
Concrete Hydration

By using the electron microscope scanner, we have done some research and analysis about the internal microcosmic structure of sea sand concrete. And combined with micro-XRD analysis as well integrative thermal analysis, we made observations of the internal composition of sea sand concrete., studying the effect on which sea sand makes during concrete hydration and the effect which fly ash made on the micro-structural characteristics of sea sand concrete.

Effects of Heat-Treatment on the Magnetic Properties of Fe2O3-CaO-SiO2 Glass Ceramics

2010 ◽  
Vol 158 ◽  
pp. 52-55 ◽  
Author(s):  
Ye Han ◽  
Ming Gu ◽  
Wei Wei Zhang ◽  
Shu Yu Yao
Keyword(s):  
Heat Treatment ◽  
Thermal Analysis ◽  
Magnetic Properties ◽  
Differential Thermal Analysis ◽  
Glass Ceramics ◽  
Vibrating Sample Magnetometer ◽  
Crystalline Phases ◽  
Sio2 Glass ◽  
X Ray ◽  
Saturation Magnetisation

The Fe2O3-CaO-SiO2 glass ceramics were prepared by the method of quenching and controlled crystallisation. Differential thermal analysis, X-ray diffractometry and vibrating sample magnetometer were used to study the crystallisation and magnetic properties of Fe2O3-CaO-SiO2 glass ceramics. It was concluded that the main crystalline phases of glass ceramics during the process were Hematite, Iron Silico Oxide and Hedenbergite. The saturation magnetisation values (Ms) of glass ceramics varied between 108 emu•g-1 and 147 emu•g-1. The crystallisation of Hedenbergite lead to the high Hc value (~2000Oe).

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