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Open AccessArticle

Properties of Inorganic Polymers Produced from Brick Waste and Metallurgical Slag

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School of Mineral Resources Engineering, Technical University of Crete, 73100 Chania, Greece
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School of Environmental Engineering, Technical University of Crete, 73100 Chania, Greece
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School of Mining and Metallurgical Engineering, National Technical University of Athens, 15780 Zografos, Greece
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(9), 551; https://doi.org/10.3390/min9090551
Received: 8 July 2019 / Revised: 22 August 2019 / Accepted: 9 September 2019 / Published: 12 September 2019
(This article belongs to the Special Issue Metallurgical Slags)
This paper explores the alkali activation potential of brick wastes and metallurgical slags. Inorganic polymers (IPs) were produced using an alkaline medium consisting of sodium hydroxide and sodium silicate solutions and the optimum synthesis conditions were determined. In this context, the variable parameters, such as solid to liquid (S/L) ratio, curing temperature (60, 80 and 90 °C) and ageing time (7 and 28 days) on the compressive strength and the morphology of the produced IPs were investigated. Specimens produced under the optimum synthesis conditions were subjected to high temperature firing and immersed in distilled water and acidic solutions for various periods of time, in order to assess their durability and structural integrity. The results showed that the IPs produced using a mix ratio of 50 wt % metallurgical slag and 50 wt % brick wastes, cured at 90 °C and aged for 7 days obtained the highest compressive strength (48.9 MPa). X-ray fluorescence analysis (XRF), particle size analysis, Fourier transform infrared spectroscopy (FTIR), mineralogical analysis (XRD), mercury intrusion porosimetry (MIP), scanning electron microscopy (SEM) and thermogravimetric (TG) analysis also confirmed the optimum microstructural characteristics and the chemical reactions that took place during synthesis. The overall results of this study indicate that the co-valorization of different waste streams, which are produced in large quantities and cause environmental problems if not properly managed, is a viable alternative for the production of binders or secondary construction materials with higher added value. View Full-Text
Keywords: inorganic polymers (IPs); brick waste; metallurgical slag; compressive strength inorganic polymers (IPs); brick waste; metallurgical slag; compressive strength
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MDPI and ACS Style

Soultana, A.; Valouma, A.; Bartzas, G.; Komnitsas, K. Properties of Inorganic Polymers Produced from Brick Waste and Metallurgical Slag. Minerals 2019, 9, 551.

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